foreshock


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Related to foreshock: tsunami, aftershock

foreshock

[′fȯr‚shäk]
(geophysics)
A tremor which precedes a larger earthquake or main shock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"Here we use a new, highly complete earthquake catalog to show that most mainshock earthquakes in southern California are preceded by elevated seismicity rates -- foreshocks -- in the days and weeks leading up to the event," said the study.
Only two participants attempted and provided correct responses to untaught prefixed words before receiving instruction (Dan: foresight, forethought, foreshock; Andrew: enforce, subheading, foreknowledge).
The death toll from the two powerful earthquakes, including Thursday's 6.5-magnitude foreshock, rose to 45 as of Tuesday, while search and rescue operations continued amid strong aftershocks.
The agency also said that Saturday's massive earthquake was the main event while the one on April 14 was a foreshock.
After performing required revisions, including deleting aftershock and foreshock through spatial and temporal windows method [8], homogenization of magnitudes, determination of year, completion of catalogue and etc.
These models have been further developed: for instance, superimposed undulation of foreshock activity was utilized to infer dynamical critical phenomena to estimate more exact final rupture time (e.g., Sornette and Sammis [7], Kapiris et al.
We examine all earthquakes of greater than 4.0 Mw tabulated by the National Earthquake Information Center (NEIC) within the area between 20 and 60 degrees N latitude and between 125 and 150 degrees E longitude with a view to identifying "foreshock" and "aftershock" movements of the Earth's crust related to the March 11 Tohoku earthquake.
This earthquake occurred 2 hours after a Mw 4.1 foreshock and caused 9 fatalities, 300 injuries, serious damage on 1164 buildings and economic losses estimated at more than 1200 M[euro] (data from the Municipality of Lorca).
Few aftershocks were recorded, but it was preceded by a foreshock of M 4.7 on November 23, 1988.
This is due to the fact that the earthquake events were recorded using more than one type of instrument; (2) the earthquake catalogs contained both the main shock events and the accessory shock events (foreshock and aftershock events).
Nevertheless, the first foreshock before the August 10 main event did not precede the water level anomaly, and the October 25 main event was not accompanied by any foreshocks, only by a series of five aftershocks.