Concept information
Preferred term
Aftershock
Type
-
sosa:FeatureOfInterest
Belongs to group
- Sismologie (fr)
Description
- An earthquake occurring as a consequence of a larger earthquake (referred to as the mainshock) at roughly the same location. Aftershocks are smaller than the mainshock and within 1-2 fault lengths distance from the mainshock fault. The sequence of such earthquakes following a larger one generally shows a regular decrease in the rate of occurrence, first discovered by Omori (1894), indicating a stress relaxation and redistribution process as the rocks accommodate to their new post-earthquake state. Aftershocks can continue over a period of weeks, months, or years, decreasing in frequency with time. In general, the larger the mainshock, the larger and more numerous the aftershocks, and the longer they will continue.
- Earthquake that follows a largest earthquake (referred to as the mainshock) in a sequence of earthquakes occurring in the same area. Aftershocks are generally smaller than the mainshock, and may be observed over a period of weeks, months, or years depending of the mainshock magnitude.
In other languages
-
French
URI
https://service.poleterresolide.fr/voc/FOI/c_20b1dd6a
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