foreshock

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Related to foreshocks: Seismic waves, Aftershocks

foreshock

[′fȯr‚shäk]
(geophysics)
A tremor which precedes a larger earthquake or main shock.
References in periodicals archive ?
3 earthquake that turned out to be a foreshock of the massive magnitude 9.
This event was significant because its epicenter was located in the emerged part of Western Cuba and had foreshocks and aftershocks.
Only events lying in a zone approximately parallel to the fault rupture or surrounding the main events are considered as potential foreshocks or aftershocks.
These events encouraged me to become a geophysicist--to seek to understand the fundamental physics of earthquakes and learn, for example, why foreshocks preceded the quake in Haicheng, but not in Tangshan.
Statistical Features of Foreshocks in Comparison with Other Earthquake Clusters.
One or a few mainshocks then initiate at the edge of the asperity or the front of the foreshocks.
Think of them as signs of stress, foreshocks, as more powerful forces interact under the surface due to transformations in the technology of news distribution and, with this, the economics of journalism.
Meanwhile, racial tensions strained nearly to breaking as the foreshocks of the civil rights movement erupted.
8), earthquake at the entrance of the Nicoya Gulf, Costa Rica: Its prior activity, foreshocks, aftershocks, and triggered seismicity.
All the signs of catastrophe are there, but most of the people are oblivious to the foreshocks.
He and seismologist Lucy Jones have noted patterns between foreshocks and earthquakes.
For example, the question about the causes of earthquakes not only produces an illustrated explanation of seismic tremors, it also points the reader to articles on earthquake prediction, seismological differences between earthquakes and underground nuclear explosions, and on phenomena related to earthquakes, such as after shocks, foreshocks, and swarms.