The Sixth Seal Long Overdue (Revelation 6)

        

ON THE MAP; Exploring the Fault Where the Next Big One May Be Waiting

The Big One Awaits

By MARGO NASH

Published: March 25, 2001

Alexander Gates, a geology professor at Rutgers-Newark, is co-author of “The Encyclopedia of Earthquakes and Volcanoes,“ which will be published by Facts on File in July. He has been leading a four-year effort to remap an area known as the Sloatsburg Quadrangle, a 5-by-7-mile tract near Mahwah that crosses into New York State. The Ramapo Fault, which runs through it, was responsible for a big earthquake in 1884, and Dr. Gates warns that a recurrence is overdue. He recently talked about his findings.

Q. What have you found?

A. We’re basically looking at a lot more rock, and we’re looking at the fracturing and jointing in the bedrock and putting it on the maps. Any break in the rock is a fracture. If it has movement, then it’s a fault. There are a lot of faults that are offshoots of the Ramapo. Basically when there are faults, it means you had an earthquake that made it. So there was a lot of earthquake activity to produce these features. We are basically not in a period of earthquake activity along the Ramapo Fault now, but we can see that about six or seven times in history, about 250 million years ago, it had major earthquake activity. And because it’s such a fundamental zone of weakness, anytime anything happens, the Ramapo Fault goes.

Q. Where is the Ramapo Fault?

 A. The fault line is in western New Jersey and goes through a good chunk of the state, all the way down to Flemington. It goes right along where they put in the new 287. It continues northeast across the Hudson River right under the Indian Point power plant up into Westchester County. There are a lot of earthquakes rumbling around it every year, but not a big one for a while.

Q. Did you find anything that surprised you?

A. I found a lot of faults, splays that offshoot from the Ramapo that go 5 to 10 miles away from the fault. I have looked at the Ramapo Fault in other places too. I have seen splays 5 to 10 miles up into the Hudson Highlands. And you can see them right along the roadsides on 287. There’s been a lot of damage to those rocks, and obviously it was produced by fault activities. All of these faults have earthquake potential.

Q. Describe the 1884 earthquake.

A. It was in the northern part of the state near the Sloatsburg area. They didn’t have precise ways of describing the location then. There was lots of damage. Chimneys toppled over. But in 1884, it was a farming community, and there were not many people to be injured. Nobody appears to have written an account of the numbers who were injured.

Q. What lessons we can learn from previous earthquakes?

A. In 1960, the city of Agadir in Morocco had a 6.2 earthquake that killed 12,000 people, a third of the population, and injured a third more. I think it was because the city was unprepared.There had been an earthquake in the area 200 years before. But people discounted the possibility of a recurrence. Here in New Jersey, we should not make the same mistake. We should not forget that we had a 5.4 earthquake 117 years ago. The recurrence interval for an earthquake of that magnitude is every 50 years, and we are overdue. The Agadir was a 6.2, and a 5.4 to a 6.2 isn’t that big a jump.

Q. What are the dangers of a quake that size?

A. When you’re in a flat area in a wooden house it’s obviously not as dangerous, although it could cut off a gas line that could explode. There’s a real problem with infrastructure that is crumbling, like the bridges with crumbling cement. There’s a real danger we could wind up with our water supplies and electricity cut off if a sizable earthquake goes off. The best thing is to have regular upkeep and keep up new building codes. The new buildings will be O.K. But there is a sense of complacency.

MARGO NASH

History Says Expect The Sixth Seal In New York (Revelation 6:12)

               

History Says New York Is Earthquake Prone

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If the past is any indication, New York can be hit by an earthquake, claims John Armbruster, a seismologist at Columbia University’s Lamont-Doherty Earth Observatory.

Based on historical precedent, Armbruster says the New York City metro area is susceptible to an earthquake of at least a magnitude of 5.0 once a century.

According to the New York Daily News, Lynn Skyes, lead author of a recent study by seismologists at the Lamont-Doherty Earth Observatory adds that a magnitude-6 quake hits the area about every 670 years, and magnitude-7 every 3,400 years.

A 5.2-magnitude quake shook New York City in 1737 and another of the same severity hit in 1884.

Tremors were felt from Maine to Virginia.

There are several fault lines in the metro area, including one along Manhattan’s 125th St. – which may have generated two small tremors in 1981 and may have been the source of the major 1737 earthquake, says Armbruster.

There’s another fault line on Dyckman St. and one in Dobbs Ferry in nearby Westchester County.

“The problem here comes from many subtle faults,” explained Skyes after the study was published.

He adds: “We now see there is earthquake activity on them. Each one is small, but when you add them up, they are probably more dangerous than we thought.”

“Considering population density and the condition of the region’s infrastructure and building stock, it is clear that even a moderate earthquake would have considerable consequences in terms of public safety and economic impact,” says the New York City Area Consortium for Earthquake Loss Mitigation on its website.

Armbruster says a 5.0-magnitude earthquake today likely would result in casualties and hundreds of millions of dollars in damage.

“I would expect some people to be killed,” he notes.

The scope and scale of damage would multiply exponentially with each additional tick on the Richter scale. (ANI)

New York Subways at the Sixth Seal (Revelation 6)

                      How vulnerable are NYC’s underwater subway tunnels to flooding?

Ashley Fetters
New York City is full of peculiar phenomena—rickety fire escapes; 100-year-old subway tunnels; air conditioners propped perilously into window frames—that can strike fear into the heart of even the toughest city denizen. But should they? Every month, writer Ashley Fetters will be exploring—and debunking—these New York-specific fears, letting you know what you should actually worry about, and what anxieties you can simply let slip away.
The 25-minute subway commute from Crown Heights to the Financial District on the 2/3 line is, in my experience, a surprisingly peaceful start to the workday—save for one 3,100-foot stretch between the Clark Street and Wall Street stations, where for three minutes I sit wondering what the probability is that I will soon die a torturous, claustrophobic drowning death right here in this subway car.
The Clark Street Tunnel, opened in 1916, is one of approximately a dozen tunnels that escort MTA passengers from one borough to the next underwater—and just about all of them, with the exception of the 1989 addition of the 63rd Street F train tunnel, were constructed between 1900 and 1936.
Each day, thousands of New Yorkers venture across the East River and back again through these tubes buried deep in the riverbed, some of which are nearing or even past their 100th birthdays. Are they wrong to ponder their own mortality while picturing one of these watery catacombs suddenly springing a leak?
Mostly yes, they are, says Michael Horodniceanu, the former president of MTA Capital Construction and current principal of Urban Advisory Group. First, it’s important to remember that the subway tunnel is built under the riverbed, not just in the river—so what immediately surrounds the tunnel isn’t water but some 25 feet of soil. “There’s a lot of dirt on top of it,” Horodniceanu says. “It’s well into the bed of the bottom of the channel.”
And second, as Angus Kress Gillespie, author of Crossing Under the Hudson: The Story of the Holland and Lincoln Tunnels, points out, New York’s underwater subway tunnels are designed to withstand some leaking. And withstand it they do: Pumps placed below the floor of the tunnel, he says, are always running, always diverting water seepage into the sewers. (Horodniceanu says the amount of water these pumps divert into the sewer system each day numbers in the thousands of gallons.)
Additionally, MTA crews routinely repair the grouting and caulking, and often inject a substance into the walls that creates a waterproof membrane outside the tunnel—which keeps water out of the tunnel and relieves any water pressure acting on its walls. New tunnels, Horodniceanu points out, are even built with an outside waterproofing membrane that works like an umbrella: Water goes around it, it falls to the sides, and then it gets channeled into a pumping station and pumped out.
Of course, the classic New York nightmare scenario isn’t just a cute little trickle finding its way in. The anxiety daydream usually involves something sinister, or seismic. The good news, however, is that while an earthquake or explosion would indeed be bad for many reasons, it likely wouldn’t result in the frantic flooding horror scene that plays out in some commuters’ imaginations.
The Montague Tube, which sustained severe damage during Hurricane Sandy.
MTA New York City Transit / Marc A. Hermann
Horodniceanu assures me that tunnels built more recently are “built to withstand a seismic event.” The older tunnels, however—like, um, the Clark Street Tunnel—“were not seismically retrofitted, let me put it that way,” Horodniceanu says. “But the way they were built is in such a way that I do not believe an earthquake would affect them.” They aren’t deep enough in the ground, anyway, he says, to be too intensely affected by a seismic event. (The MTA did not respond to a request for comment.)
One of the only real threats to tunnel infrastructure, Horodniceanu adds, is extreme weather. Hurricane Sandy, for example, caused flooding in the tunnels, which “created problems with the infrastructure.” He continues, “The tunnels have to be rebuilt as a result of saltwater corroding the infrastructure.”
Still, he points out, hurricanes don’t exactly happen with no warning. So while Hurricane Sandy did cause major trauma to the tunnels, train traffic could be stopped with ample time to keep passengers out of harm’s way. In 2012, Governor Andrew Cuomo directed all the MTA’s mass transit services to shut down at 7 p.m. the night before Hurricane Sandy was expected to hit New York City.
And Gillespie, for his part, doubts even an explosion would result in sudden, dangerous flooding. A subway tunnel is not a closed system, he points out; it’s like a pipe that’s open at both ends. “The force of a blast would go forwards and backwards out the exit,” he says.
So the subway-train version of that terrifying Holland Tunnel flood scene in Sylvester Stallone’s Daylight is … unrealistic, right?
“Yeah,” Gillespie laughs. “Yeah. It is.”
Got a weird New York anxiety that you want explored? E-mail tips@curbed.com, and we may include it in a future column.

New York at Risk for an Earthquake (Revelation 6:12)

        

Tony Williams surveys damage at his Mineral, Va. home after an earthquake struck Tuesday, Aug. 23, 2011. Items in his home were knocked over and displaced, and the home suffered some structural damage after the most powerful earthquake to strike the East Coast in 67 years shook buildings and rattled nerves from South Carolina to New England. The quake was centered near Mineral, a small town northwest of Richmond. (AP Photo/Steve Helber)

A look at New York City’s earth­quake risks

BY FARAZ TOOR NEW YORK CITY
PUBLISHED 4:32 PM ET APR. 02, 2018

Not every New Yorker felt it when the ground shook on August 23, 2011.

When a magnitude 5.8 earthquake cracked the soil near Mineral, Virginia that day, the energy traveled through the Northeast.

Some New Yorkers watched their homes tremor, while others felt nothing.

Researchers say New York City is due for a significant earthquake originating near the five boroughs, based on previous smaller earthquakes in and around the city. While New York is at moderate risk for earthquakes, its high population and infrastructure could lead to significant damage when a magnitude 5 quake or stronger hits the area.

Unbeknownst to many, there are numerous fault lines in the city, but a few stand out for their size and prominence: the 125th Street Fault, the Dyckman Street Fault, the Mosholu Parkway Fault, and the East River Fault.

The 125th Street Fault is the largest, running along the street, extending from New Jersey to the East River. Part of it runs to the northern tip of Central Park, while a portion extends into Roosevelt Island.

The Dyckman Street Fault is located in Inwood, crossing the Harlem River and into Morris Heights, while the Mosholu Parkway Fault is north of the Dyckman Street and 125th Street Faults.

The East River Fault looks a bit like an obtuse angle, with its top portion running parallel, to the west of Central Park, before taking a horizontal turn near 32nd St. and extending into the East River and stopping short of Brooklyn.

Just outside of the city is the Dobbs Ferry Fault, located in suburban Westchester; and the Ramapo Fault, running from eastern Pennsylvania to the mid-Hudson Valley, passing within a few miles northwest of the Indian Point Nuclear Plant, less than 40 miles north of the city and astride the intersection of two active seismic zones.

The locations of faults and the prevalence of earthquakes is generally not a concern for most New Yorkers. One reason might be that perceptions of weaker earthquakes vary widely.

On Nov. 30, a magnitude 4.1 earthquake, centered near Dover, Delaware, could be felt in nearby states. Less than 200 miles away in New York City, some people reported on social media that they felt their houses and apartments shaking. At the same time, some New Yorkers, again, did not feel anything:

KevBarNYC@KevBarNYC

Just felt my whole building shake in the East Village, NYC #earthquake #nyc

14

2:51 PM – Nov 30, 2017

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Mike Baumwoll @baumwoll

So apparently we just had a small earthquake in NYC? Did anyone feel it? #NYCearthquake

6

3:00 PM – Nov 30, 2017

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What I referred to as “a giant ghost in the apartment shaking the christmas tree” in my texts to everyone this p.m. turned out to be my very first #earthquake in #nyc! 

— Kate Kosaya (@KateKosaya) November 30, 2017

Andrea Marks@andreaa_marks

I felt the earthquake too! I wanna be part of this! I watched the water in a water bottle go back forth for a long time after the 3 seconds of shaking. Thought about the T-rex scene from Jurassic Park and went back to work. #earthquake #nyc

3:35 PM – Nov 30, 2017 · Brooklyn, NY

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Brian Ragan@BrianRagan

Well that’s an unexpected alert. #nyc #earthquake

3

3:31 PM – Nov 30, 2017 · Manhattan, NY

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Marianna Schaffer@marschaffer

Just felt earthquake like thing at my desk in #NYC anyone else? Floor and chair moved #earthquake #eastcoastnotusedtothis #helpfromleftcoast

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2:57 PM – Nov 30, 2017

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NYPD 19th Precinct

@NYPD19Pct

Did you feel that?

We didn’t but The US Geological Survey reports that a 4.4 magnitude #earthquake has occurred in Dover, Delaware & was reportedly felt by some in the #NYC area. There are no reports of injuries or damage in #NYC at this time.#UpperEastSide #UES

15

3:46 PM – Nov 30, 2017

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Won-Young Kim is a senior research scientist at Columbia University’s Lamont-Doherty Earth Observatory, which monitors and records data on earthquakes that occur in the northeast. Kim says it’s not clear who feels smaller earthquakes, as evident by a magnitude 0.8 quake in the city in December of 2004.

“Hundreds of people called local police, and police called us. Our system was unable to detect that tiny earthquake automatically,” Kim said. “We looked at it, and, indeed, there was a small signal.”

Kim says some parts of the city will feel magnitude 1 or 2 earthquakes even if the seismic activity does not result in any damage.

You have to go back to before the 20th Century, however, to find the last significant earthquake that hit the city. According to Lamont-Doherty researchers, magnitude 5.2 earthquakes occurred in 1737 and 1884. In newspaper accounts, New Yorkers described chimneys falling down and feeling the ground shake underneath them.

“1737 — that was located close to Manhattan,” Kim said. “It was very close to New York City.”

According to Kim, the 1884 quake was felt in areas in or close to the city, such as the Rockaways and Sandy Hook, New Jersey. But it was felt even as far away as Virginia and Maine.

From 1677 to 2007, there were 383 known earthquakes in a 15,000-square-mile area around New York City, researchers at Lamont-Doherty said in a 2008 study.

A 4.9 located in North Central New Jersey was felt in the city in 1783; a 4 hit Ardsley in 1985; and in 2001, magnitude 2.4 and 2.6 quakes were detected in Manhattan itself for the first time.

But the 1737 and 1884 quakes remain the only known ones of at least magnitude 5 to hit the city.

Smaller earthquakes are not to be ignored. Lamont-Doherty researchers say frequent small quakes occur in predictable ratios to larger ones and thus can be used — along with the fault lengths, detected tremors and calculations of how stress builds in the crust — to create a rough time scale.

The takeaway? New York City is due for a significant earthquake.

Researchers say New York City is susceptible to at least a magnitude 5 earthquake once every 100 years, a 6 about every 670 years, and 7 about every 3,400 years.

It’s been 134 years since New York was last hit by at least a magnitude 5. When it happens next, researchers say it won’t be much like 1884.

The city’s earthquake hazard is moderate, according to the New York City Area Consortium for Earthquake Loss Mitigation (NYCEM), but experts agree that, due to its higher population and infrastructure, the damage would be significant.

Before 1995, earthquake risks were not taken into consideration for the city’s building code. Thus, Lamont-Doherty says many older buildings, such as unenforced three- to six-story buildings, could suffer major damage or crumble.

The damage an earthquake causes is also dependent on what’s in the ground. According to the U.S. Geological Survey, bedrock is more resistant to earthquakes than sediment.

The upper third of Manhattan has harder soil that is more resistant to shaking. Parts of Midtown are more susceptible, while Downtown Manhattan’s soil is even softer, according to the NYCEM.

Exceptions to Upper Manhattan’s strength? Portions of Harlem and Inwood — both areas consist of a large amount of soft soil. Central Park has the strongest soil in Manhattan, outside of a small segment of Inwood..

Not all boroughs are created equal. While the Bronx is also made of solid bedrock, the ground in Queens and Brooklyn is softer.

“If you go to Queens and Brooklyn, you have sediment, so there would be more shaking relative to Manhattan,” Kim said. “So, it’s not easy to say the damage would be the same.”

Analysis pins the damage from a magnitude 5 earthquake hitting New York City in the billions, according to Lamont-Doherty.

New York City is not a hotbed for seismic activity; it is not close to a tectonic plate, and it is not clear if one of the faults would be the source of a strong quake. But the predicted damage to the city has concerned many experts.

Until that day, earthquakes are isolated events for New Yorkers. Some have felt the ground move, while others have only felt shaking when subway cars travel underground.

But researchers agree: One day, the ground will wake up in the city that never sleeps, and all New Yorkers will understand what Mineral, Virginia felt when their homes rattled with the earth.

The Trend Leading to the Sixth Seal (Revelation 6:12)

        

SMALL EARTHQUAKE SHAKES PARTS OF NEW YORK STATE

HOPKINS

January 14, 2020

Are we seeing a trend? After two small earthquakes hit upstate New York on January 3 and January 7, a slightly larger one was felt near the New York-Canadian border early Monday morning. And while the quake actually happened in an entirely different country, the effects were felt far south into New York state, and the surrounding region.

The United States Geological Survey says the 3.3 magnitude quake hit several mikes south of the town of Ormstown, Quebec a little after 5:30 A.M. There are some slightly conflicting reports, as the Montreal Gazette reports that the quake was a 3.6 magnitude. Ormstown is located around 20 minutes north of the New York border.

The Times Union says the quake was felt as far south as the town of Ticonderoga in Essex County, and as far west as the city of Ogdensburg on the New York-Ontario border. The effects were also felt as far north as Montreal.

No damage was reported.

Yes, earthquakes do happen in the northeastern U.S and Canada occasionally. In December 2019, a 2.1 tremor was reported near Sodus Point, off the coast of Lake Ontario.

Some strike even closer to home. In April 2017, a 1.3 tremor occurred around two and half miles west of Pawling. In early 2016, an even smaller quake happened near Port Chester and Greenwich, CT. In the summer of 2019, a quake struck off the New Jersey coast.

The most well known fault line near our area is the Ramapo fault line. The 185 mile system of faults runs through parts of New York, New Jersey, and Pennsylvania, and has been known to spawn usually small earthquakes.

On August 23, 2011, a 5.8 quake, that was centered in Virginia, was felt all the way up the east coast. Several moderate (at least a 5 on the richter scale) quakes have occurred near New York City in 1737, 1783 and 1884.

Listen to Middays With Hopkins weekdays from 10AM to 2PM on 101.5 WPDH. Stream us live through the website, Alexa-enabled device, Google Home or the WPDH mobile app.

The Year of the Sixth Seal (Revelation 6:12)

          Sloshing of Earth’s core may spike major earthquakes

By Paul VoosenOct. 30, 2017 , 1:45 PM
The number of major earthquakes, like the magnitude-7 one that devastated Haiti in 2010, seems to be correlated with minute fluctuations in day length.
SEATTLE—The world doesn’t stop spinning. But every so often, it slows down. For decades, scientists have charted tiny fluctuations in the length of Earth’s day: Gain a millisecond here, lose a millisecond there. Last week at the annual meeting of the Geological Society of America here, two geophysicists argued that these minute changes could be enough to influence the timing of major earthquakes—and potentially help forecast them.
During the past 100 years, Earth’s slowdowns have correlated surprisingly well with periods with a global increase in magnitude-7 and larger earthquakes, according to Roger Bilham of the University of Colorado (CU) in Boulder and Rebecca Bendick at the University of Montana in Missoula. Usefully, the spike, which adds two to five more quakes than typical, happens well after the slow-down begins. “The Earth offers us a 5-years heads up on future earthquakes, which is remarkable,” says Bilham, who presented the work.
Most seismologists agree that earthquake prediction is a minefield. And so far, Bilham and Bendick have only fuzzy, hard-to-test ideas about what might cause the pattern they found. But the finding is too provocative to ignore, other researchers say. “The correlation they’ve found is remarkable, and deserves investigation,” says Peter Molnar, a geologist also at CU.
The research started as a search for synchrony in earthquake timing. Individual oscillators, be they fireflies, heart muscles, or metronomes, can end up vibrating in synchrony as a result of some kind of cross-talk—or some common influence. To Bendick, it didn’t seem a far jump to consider the faults that cause earthquakes, with their cyclical buildup of strain and violent discharge, as “really noisy, really crummy oscillators,” she says. She and Bilham dove into the data, using the only complete earthquake catalog for the past 100 years: magnitude-7 and larger earthquakes.
In work published in August in Geophysical Research Letters they reported two patterns: First, major quakes appeared to cluster in time
—although not in space. And second, the number of large earthquakes seemed to peak at 32-year intervals. The earthquakes could be somehow talking to each other, or an external force could be nudging the earth into rupture.
Exploring such global forces, the researchers eventually discovered the match with the length of day. Although weather patterns such as El Nino can drive day length to vary back and forth by a millisecond over a year or more, a periodic, decades-long fluctuation of several milliseconds—in particular, its point of peak slow down about every three decades or so—lined up with the quake trend perfectly. "Of course that seems sort of crazy," Bendick says. But maybe it isn’t. When day length changes over decades, Earth’s magnetic field also develops a temporary ripple. Researchers think slight changes in the flow of the molten iron of the outer core may be responsible for both effects. Just what happens is uncertain—perhaps a bit of the molten outer core sticks to the mantle above. That might change the flow of the liquid metal, altering the magnetic field, and transfer enough momentum between the mantle and the core to affect day length.
Seismologists aren’t used to thinking about the planet’s core, buried 2900 kilometers beneath the crust where quakes happen. But they should, Bilham said during his talk here. The core is “quite close to us. It’s closer than New York from here,” he said.
At the equator, Earth spins 460 meters per second. Given this high velocity, it’s not absurd to think that a slight mismatch in speed between the solid crust and mantle and the liquid core could translate into a force somehow nudging quakes into synchrony, Molnar says. Of course, he adds, “It might be nonsense.” But the evidence for some kind of link is compelling, says geophysicist Michael Manga of the University of California, Berkeley. “I’ve worked on earthquakes triggered by seasonal variation, melting snow. His correlation is much better than what I’m used to seeing.”
One way or another, says James Dolan, a geologist at the University of Southern California in Los Angeles, “we’re going to know in 5 years.” That’s because Earth’s rotation began a periodic slow-down 4-plus years ago. Beginning next year, Earth should expect five more major earthquakes a year than average—between 17 to 20 quakes, compared with the anomalously low four so far this year. If the pattern holds, it will put a new spin on earthquake forecasting.
doi:10.1126/science.aar3598

History Says Expect The Sixth Seal In New York (Revelation 6:12)

              

History Says New York Is Earthquake Prone

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If the past is any indication, New York can be hit by an earthquake, claims John Armbruster, a seismologist at Columbia University’s Lamont-Doherty Earth Observatory.

Based on historical precedent, Armbruster says the New York City metro area is susceptible to an earthquake of at least a magnitude of 5.0 once a century.

According to the New York Daily News, Lynn Skyes, lead author of a recent study by seismologists at the Lamont-Doherty Earth Observatory adds that a magnitude-6 quake hits the area about every 670 years, and magnitude-7 every 3,400 years.

A 5.2-magnitude quake shook New York City in 1737 and another of the same severity hit in 1884.

Tremors were felt from Maine to Virginia.

There are several fault lines in the metro area, including one along Manhattan’s 125th St. – which may have generated two small tremors in 1981 and may have been the source of the major 1737 earthquake, says Armbruster.

There’s another fault line on Dyckman St. and one in Dobbs Ferry in nearby Westchester County.

“The problem here comes from many subtle faults,” explained Skyes after the study was published.

He adds: “We now see there is earthquake activity on them. Each one is small, but when you add them up, they are probably more dangerous than we thought.”

“Considering population density and the condition of the region’s infrastructure and building stock, it is clear that even a moderate earthquake would have considerable consequences in terms of public safety and economic impact,” says the New York City Area Consortium for Earthquake Loss Mitigation on its website.

Armbruster says a 5.0-magnitude earthquake today likely would result in casualties and hundreds of millions of dollars in damage.

“I would expect some people to be killed,” he notes.

The scope and scale of damage would multiply exponentially with each additional tick on the Richter scale. (ANI)

New York at Risk for an Earthquake (Revelation 6:12)

        

Tony Williams surveys damage at his Mineral, Va. home after an earthquake struck Tuesday, Aug. 23, 2011. Items in his home were knocked over and displaced, and the home suffered some structural damage after the most powerful earthquake to strike the East Coast in 67 years shook buildings and rattled nerves from South Carolina to New England. The quake was centered near Mineral, a small town northwest of Richmond. (AP Photo/Steve Helber)

A look at New York City’s earth­quake risks

BY FARAZ TOOR NEW YORK CITY
PUBLISHED 4:32 PM ET APR. 02, 2018

Not every New Yorker felt it when the ground shook on August 23, 2011.

When a magnitude 5.8 earthquake cracked the soil near Mineral, Virginia that day, the energy traveled through the Northeast.

Some New Yorkers watched their homes tremor, while others felt nothing.

Researchers say New York City is due for a significant earthquake originating near the five boroughs, based on previous smaller earthquakes in and around the city. While New York is at moderate risk for earthquakes, its high population and infrastructure could lead to significant damage when a magnitude 5 quake or stronger hits the area.

Unbeknownst to many, there are numerous fault lines in the city, but a few stand out for their size and prominence: the 125th Street Fault, the Dyckman Street Fault, the Mosholu Parkway Fault, and the East River Fault.

The 125th Street Fault is the largest, running along the street, extending from New Jersey to the East River. Part of it runs to the northern tip of Central Park, while a portion extends into Roosevelt Island.

The Dyckman Street Fault is located in Inwood, crossing the Harlem River and into Morris Heights, while the Mosholu Parkway Fault is north of the Dyckman Street and 125th Street Faults.

The East River Fault looks a bit like an obtuse angle, with its top portion running parallel, to the west of Central Park, before taking a horizontal turn near 32nd St. and extending into the East River and stopping short of Brooklyn.

Just outside of the city is the Dobbs Ferry Fault, located in suburban Westchester; and the Ramapo Fault, running from eastern Pennsylvania to the mid-Hudson Valley, passing within a few miles northwest of the Indian Point Nuclear Plant, less than 40 miles north of the city and astride the intersection of two active seismic zones.

The locations of faults and the prevalence of earthquakes is generally not a concern for most New Yorkers. One reason might be that perceptions of weaker earthquakes vary widely.

On Nov. 30, a magnitude 4.1 earthquake, centered near Dover, Delaware, could be felt in nearby states. Less than 200 miles away in New York City, some people reported on social media that they felt their houses and apartments shaking. At the same time, some New Yorkers, again, did not feel anything:

KevBarNYC@KevBarNYC

Just felt my whole building shake in the East Village, NYC #earthquake #nyc

14

2:51 PM – Nov 30, 2017

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Mike Baumwoll @baumwoll

So apparently we just had a small earthquake in NYC? Did anyone feel it? #NYCearthquake

6

3:00 PM – Nov 30, 2017

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What I referred to as “a giant ghost in the apartment shaking the christmas tree” in my texts to everyone this p.m. turned out to be my very first #earthquake in #nyc! 

— Kate Kosaya (@KateKosaya) November 30, 2017

Andrea Marks@andreaa_marks

I felt the earthquake too! I wanna be part of this! I watched the water in a water bottle go back forth for a long time after the 3 seconds of shaking. Thought about the T-rex scene from Jurassic Park and went back to work. #earthquake #nyc

3:35 PM – Nov 30, 2017 · Brooklyn, NY

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Brian Ragan@BrianRagan

Well that’s an unexpected alert. #nyc #earthquake

3

3:31 PM – Nov 30, 2017 · Manhattan, NY

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Marianna Schaffer@marschaffer

Just felt earthquake like thing at my desk in #NYC anyone else? Floor and chair moved #earthquake #eastcoastnotusedtothis #helpfromleftcoast

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2:57 PM – Nov 30, 2017

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NYPD 19th Precinct

@NYPD19Pct

Did you feel that?

We didn’t but The US Geological Survey reports that a 4.4 magnitude #earthquake has occurred in Dover, Delaware & was reportedly felt by some in the #NYC area. There are no reports of injuries or damage in #NYC at this time.#UpperEastSide #UES

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3:46 PM – Nov 30, 2017

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Won-Young Kim is a senior research scientist at Columbia University’s Lamont-Doherty Earth Observatory, which monitors and records data on earthquakes that occur in the northeast. Kim says it’s not clear who feels smaller earthquakes, as evident by a magnitude 0.8 quake in the city in December of 2004.

“Hundreds of people called local police, and police called us. Our system was unable to detect that tiny earthquake automatically,” Kim said. “We looked at it, and, indeed, there was a small signal.”

Kim says some parts of the city will feel magnitude 1 or 2 earthquakes even if the seismic activity does not result in any damage.

You have to go back to before the 20th Century, however, to find the last significant earthquake that hit the city. According to Lamont-Doherty researchers, magnitude 5.2 earthquakes occurred in 1737 and 1884. In newspaper accounts, New Yorkers described chimneys falling down and feeling the ground shake underneath them.

“1737 — that was located close to Manhattan,” Kim said. “It was very close to New York City.”

According to Kim, the 1884 quake was felt in areas in or close to the city, such as the Rockaways and Sandy Hook, New Jersey. But it was felt even as far away as Virginia and Maine.

From 1677 to 2007, there were 383 known earthquakes in a 15,000-square-mile area around New York City, researchers at Lamont-Doherty said in a 2008 study.

A 4.9 located in North Central New Jersey was felt in the city in 1783; a 4 hit Ardsley in 1985; and in 2001, magnitude 2.4 and 2.6 quakes were detected in Manhattan itself for the first time.

But the 1737 and 1884 quakes remain the only known ones of at least magnitude 5 to hit the city.

Smaller earthquakes are not to be ignored. Lamont-Doherty researchers say frequent small quakes occur in predictable ratios to larger ones and thus can be used — along with the fault lengths, detected tremors and calculations of how stress builds in the crust — to create a rough time scale.

The takeaway? New York City is due for a significant earthquake.

Researchers say New York City is susceptible to at least a magnitude 5 earthquake once every 100 years, a 6 about every 670 years, and 7 about every 3,400 years.

It’s been 134 years since New York was last hit by at least a magnitude 5. When it happens next, researchers say it won’t be much like 1884.

The city’s earthquake hazard is moderate, according to the New York City Area Consortium for Earthquake Loss Mitigation (NYCEM), but experts agree that, due to its higher population and infrastructure, the damage would be significant.

Before 1995, earthquake risks were not taken into consideration for the city’s building code. Thus, Lamont-Doherty says many older buildings, such as unenforced three- to six-story buildings, could suffer major damage or crumble.

The damage an earthquake causes is also dependent on what’s in the ground. According to the U.S. Geological Survey, bedrock is more resistant to earthquakes than sediment.

The upper third of Manhattan has harder soil that is more resistant to shaking. Parts of Midtown are more susceptible, while Downtown Manhattan’s soil is even softer, according to the NYCEM.

Exceptions to Upper Manhattan’s strength? Portions of Harlem and Inwood — both areas consist of a large amount of soft soil. Central Park has the strongest soil in Manhattan, outside of a small segment of Inwood..

Not all boroughs are created equal. While the Bronx is also made of solid bedrock, the ground in Queens and Brooklyn is softer.

“If you go to Queens and Brooklyn, you have sediment, so there would be more shaking relative to Manhattan,” Kim said. “So, it’s not easy to say the damage would be the same.”

Analysis pins the damage from a magnitude 5 earthquake hitting New York City in the billions, according to Lamont-Doherty.

New York City is not a hotbed for seismic activity; it is not close to a tectonic plate, and it is not clear if one of the faults would be the source of a strong quake. But the predicted damage to the city has concerned many experts.

Until that day, earthquakes are isolated events for New Yorkers. Some have felt the ground move, while others have only felt shaking when subway cars travel underground.

But researchers agree: One day, the ground will wake up in the city that never sleeps, and all New Yorkers will understand what Mineral, Virginia felt when their homes rattled with the earth.