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In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousands of instrumentally detectable aftershocks, which steadily decrease in magnitude and frequency according ...
Foreshock activity has been detected for about 40% of all moderate to large earthquakes, [2] and about 70% for events of M>7.0. [3] They occur from a matter of minutes to days or even longer before the main shock; for example, the 2002 Sumatra earthquake is regarded as a foreshock of the 2004 Indian Ocean earthquake with a delay of more than two years between the two events.
An aftershock is an earthquake that occurs after a previous earthquake, the mainshock. Rapid changes of stress between rocks, and the stress from the original earthquake are the main causes of these aftershocks, [ 34 ] along with the crust around the ruptured fault plane as it adjusts to the effects of the mainshock. [ 31 ]
Aftershocks from devastating earthquakes in the 1800s near the Missouri-Kentucky border and in Charleston, South Carolina, may still be occurring, a study found.
Aftershocks are possible in the following days, months or years after Friday's 4.8 magnitude earthquake, which was felt throughout parts of New York.
Earthquakes large enough to be felt by a lot of people are relatively uncommon on the East Coast. ... USGS experts say there is a risk of aftershocks for weeks to months, which are expected after ...
Induced seismicity, typically minor earthquakes and tremors that are caused by human activity that alters the stresses and strains on the Earth's crust. [10] Interplate earthquake, an earthquake that occurs at the boundary between tectonic plates. [11] Intraplate earthquake, an earthquake that occurs within the interior of a tectonic plate. [12 ...
Aftershocks that can be felt by people — with magnitudes in the “upper twos” and higher — will likely continue for another week, he said. Smaller aftershocks could persist for months.