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- Most large earthquakes are followed by additional earthquakes, called aftershocks, which make up an aftershock sequence. While most aftershocks are smaller than the mainshock, they can still be damaging or deadly. A small fraction of earthquakes are followed by a larger earthquake, in which case the first earthquake is referred to as a foreshock.
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Learn how to forecast the number and magnitude of aftershocks following a large earthquake, and how to find the forecast for a specific event. The forecast is based on a statistical model of past aftershock sequences and updated regularly.
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.
Apr 5, 2024 · People can experience dizziness, anxiety and even “phantom” aftershocks following a quake. Experts say that it’s important to avoid consuming too much media in the wake of a stressful event ...
Apr 5, 2024 · Aftershocks are small earthquakes that occur after a mainshock, and are usually minor and harmless. Learn how to identify, prepare and respond to aftershocks, and the difference between foreshocks and mainshocks.
May 4, 2024 · An aftershock is a smaller earthquake that follows the main shock of a larger earthquake. Learn how aftershocks are caused, how they decay over time, and some notable examples of aftershocks that caused damage and casualties.
- John P. Rafferty
Learn how foreshocks and aftershocks are related to earthquakes and how they differ in terms of timing, size, and location. Find out more about the causes, effects, and examples of earthquakes and their associated phenomena.
Aftershocks are themselves earthquakes, but they are more accurately described as the lower-magnitude (or lower-intensity) tremors that follow the principal earthquake or main shock (that is, the largest earthquake in a sequence of earthquakes).
