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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 ...
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In Japan this kind of information is used when an earthquake occurs to anticipate the severity of damage to be expected in different areas. [2] The intensity of local ground-shaking depends on several factors besides the magnitude of the earthquake, [3] one of the most important being soil conditions. For instance, thick layers of soft soil ...
[1] With minor modifications in the mid-1970s and early 1980s, the MSK scale became widely used in Europe and the USSR . In early 1990s, the European Seismological Commission (ESC) used many of the principles formulated in the MSK in the development of the European macroseismic scale , which is now a de facto standard for evaluation of seismic ...
The criteria for amounts vary over different county warning areas; accumulations range from 1 ⁄ 4 to 1 ⁄ 2 inch (6.4 to 12.7 mm) or more of freezing rain on elevated horizontal flat surfaces. (Hazardous icing conditions are covered and similar warning criteria are used by the Meteorological Service of Canada for their Freezing Rain Warning ...
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.
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