What time was the earthquake in NYC and how long after the earthquake are there usually aftershocks?
New York City experienced a 4.8 magnitude earthquake on Friday morning. Residents have been advised to prepare themselves for potential aftershocks.
An earthquake measuring 4.8 on the Richter scale shook the New York City metropolitan area at 10:23 a.m. ET on Friday, according to the US Geological Survey (USGS).
New Yorkers experienced tremors for more than 30 seconds, although there were no immediate reports of damage or injuries. However, the city encountered transportation delays and closures.
The quake was also detected from Boston down to Baltimore. It came as a surprise, as Northeastern United States does not often feel earthquakes of this magnitude.
For the moment, there is no danger of the east coast being battered by a tsunami, according to the National Tsunami Warning Center.
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How long after the earthquake are there usually aftershocks?
New York residents have been advised to prepare for aftershocks. According to the Southern California Earthquake Center, an earthquake that is big enough to cause damage will probably produce perceptible aftershocks within the first hour. However, the rate of aftershocks dies off quickly.
The frequency of aftershocks differs according to their magnitudes. According to the Japanese Meteorological Agency, the number of aftershocks with a magnitude of M is about 10 times bigger than that of aftershocks with a magnitude of M+1.
That would mean that the number of aftershocks with a magnitude of 5 would be about 10 times greater than that of aftershocks with a magnitude of 6.