Earthquake Rattles Central NJ ... Again
Updated 9:45 AM EST, Sun, Feb 15, 2009
An earthquake was reported in New Jersey Saturday evening.
For the second time in two weeks, a small earthquake has rattled an area of central New Jersey.
But like the last quake in Morris County, no significant damage or injuries were reported.
The latest earthquake, with a magnitude of 2.2, was recorded shortly before 5:30 p.m. Saturday, said Scott DiGiralomo, a coordinator with the county's office of emergency management. He told The Star-Ledger of Newark that the quake's epicenter was about 6 miles north of Boonton, and it was felt in neighboring Montville.
An earthquake of magnitude 3.0 had rattled windows and alarmed residents of several Morris communities on Feb. 2. That quake was centered in Rockaway, Dover and Morris Plains.
Earthquake Rattles Central NJ ... Again
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Re: Earthquake Rattles Central NJ ... Again
Tectonic Summary
EARTHQUAKES IN THE NEW YORK - PHILADELPHIA - WILMINGTON URBAN CORRIDOR
New York - Philadelphia - Wilmington urban corridor Since colonial times people in the New York - Philadelphia - Wilmington urban corridor have felt small earthquakes and suffered damage from infrequent larger ones. New York City was damaged in 1737 and 1884. Moderately damaging earthquakes strike somewhere in the urban corridor roughly twice a century, and smaller earthquakes are felt roughly every 2-3 years.
Earthquakes in the central and eastern U.S., although less frequent than in the western U.S., are typically felt over a much broader region. East of the Rockies, an earthquake can be felt over an area as much as ten times larger than a similar magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake typically can be felt at many places as far as 100 km (60 mi) from where it occurred, and it infrequently causes damage near its source. A magnitude 5.5 eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where it occurred, and sometimes causes damage as far away as 40 km (25 mi).
FAULTS
Earthquakes everywhere occur on faults within bedrock, usually miles deep. Most bedrock beneath the urban corridor was assembled as continents collided to form a supercontinent about 500-300 million years ago, raising the Appalachian Mountains. Most of the rest of the bedrock formed when the supercontinent rifted apart about 200 million years ago to form what are now the northeastern U.S., the Atlantic Ocean, and Europe.
At well-studied plate boundaries like the San Andreas fault system in California, often scientists can determine the name of the specific fault that is responsible for an earthquake. In contrast, east of the Rocky Mountains this is rarely the case. New York City, Philadelphia, and Wilmington are far from the nearest plate boundaries, which are in the center of the Atlantic Ocean and in the Caribbean Sea. The urban corridor is laced with known faults but numerous smaller or deeply buried faults remain undetected. Even the known faults are poorly located at earthquake depths. Accordingly, few, if any, earthquakes in the urban corridor can be linked to named faults. It is difficult to determine if a known fault is still active and could slip and cause an earthquake. As in most other areas east of the Rockies, the best guide to earthquake hazards in the New York - Philadelphia - Wilmington urban corridor is the earthquakes themselves.
EARTHQUAKES IN THE NEW YORK - PHILADELPHIA - WILMINGTON URBAN CORRIDOR
New York - Philadelphia - Wilmington urban corridor Since colonial times people in the New York - Philadelphia - Wilmington urban corridor have felt small earthquakes and suffered damage from infrequent larger ones. New York City was damaged in 1737 and 1884. Moderately damaging earthquakes strike somewhere in the urban corridor roughly twice a century, and smaller earthquakes are felt roughly every 2-3 years.
Earthquakes in the central and eastern U.S., although less frequent than in the western U.S., are typically felt over a much broader region. East of the Rockies, an earthquake can be felt over an area as much as ten times larger than a similar magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake typically can be felt at many places as far as 100 km (60 mi) from where it occurred, and it infrequently causes damage near its source. A magnitude 5.5 eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where it occurred, and sometimes causes damage as far away as 40 km (25 mi).
FAULTS
Earthquakes everywhere occur on faults within bedrock, usually miles deep. Most bedrock beneath the urban corridor was assembled as continents collided to form a supercontinent about 500-300 million years ago, raising the Appalachian Mountains. Most of the rest of the bedrock formed when the supercontinent rifted apart about 200 million years ago to form what are now the northeastern U.S., the Atlantic Ocean, and Europe.
At well-studied plate boundaries like the San Andreas fault system in California, often scientists can determine the name of the specific fault that is responsible for an earthquake. In contrast, east of the Rocky Mountains this is rarely the case. New York City, Philadelphia, and Wilmington are far from the nearest plate boundaries, which are in the center of the Atlantic Ocean and in the Caribbean Sea. The urban corridor is laced with known faults but numerous smaller or deeply buried faults remain undetected. Even the known faults are poorly located at earthquake depths. Accordingly, few, if any, earthquakes in the urban corridor can be linked to named faults. It is difficult to determine if a known fault is still active and could slip and cause an earthquake. As in most other areas east of the Rockies, the best guide to earthquake hazards in the New York - Philadelphia - Wilmington urban corridor is the earthquakes themselves.
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Re: Earthquake Rattles Central NJ ... Again
3rd Earthquake In As Many Weeks Rattles New Jersey
2.3 Magnitude 'Quake Shakes North-Central Jersey
MORRISTOWN, N.J. (CBS/AP) ―
Related Stories
* 3.0 Magnitude Earthquake Rattles Morris County, NJ (2/4/2009)
* Another Small Earthquake Rattles Central N.J. (2/15/2009)
For the third time in three weeks, a small earthquake has rattled an area of north-central New Jersey.
No damage or injuries were reported from the 2.3 magnitude quake, which was recorded shortly before 1:42 a.m. Wednesday.
Scott DiGiralomo, a coordinator with the county's office of emergency management, says the epicenter was just over a mile outside Dover. It was felt mostly by people in Denville and Randolph.
The quake is the third to hit Morris County since Feb. 2.
A 3.0 magnitude earthquake rattled windows and alarmed residents on Feb. 2. That quake was centered in Rockaway, Dover and Morris Plains.
A 2.2 magnitude quake on Valentine's Day shook residents in Boonton and neighboring Montville.
2.3 Magnitude 'Quake Shakes North-Central Jersey
MORRISTOWN, N.J. (CBS/AP) ―
Related Stories
* 3.0 Magnitude Earthquake Rattles Morris County, NJ (2/4/2009)
* Another Small Earthquake Rattles Central N.J. (2/15/2009)
For the third time in three weeks, a small earthquake has rattled an area of north-central New Jersey.
No damage or injuries were reported from the 2.3 magnitude quake, which was recorded shortly before 1:42 a.m. Wednesday.
Scott DiGiralomo, a coordinator with the county's office of emergency management, says the epicenter was just over a mile outside Dover. It was felt mostly by people in Denville and Randolph.
The quake is the third to hit Morris County since Feb. 2.
A 3.0 magnitude earthquake rattled windows and alarmed residents on Feb. 2. That quake was centered in Rockaway, Dover and Morris Plains.
A 2.2 magnitude quake on Valentine's Day shook residents in Boonton and neighboring Montville.
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