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The first earthquake is usually the worst, but aftershocks, or more earthquakes, may follow. Aftershocks usually occur within the next two days, but have also been recorded to happen for years. Their size, strength, and frequency usually diminish with time.
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library.thinkquest.org/C003603/english/earthquakes/afte...
library.thinkquest.org/C003603/english/earthquakes/aftershocks.shtml
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Aftershocks differ from other earthquakes only in that we expect them. Unlike most earthquakes, aftershocks occur within predictable bounds of space, time, and magnitude.
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pasadena.wr.usgs.gov/hough/eos.html
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(Reference recent California aftershock at Big Bear 6 months after original quake centered almost 100 miles south) Reply #: 1 of 1 Author: Sam Bowen Subject: Aftershocks vs. Earthquakes Text: I doubt if there is a precise definition.
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www.newton.dep.anl.gov/newton/askasci/1993/general/GEN0...
www.newton.dep.anl.gov/newton/askasci/1993/general/GEN004.HTM
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In the region of the mainshock, we call subsequent earthquakes aftershocks as long as the rate at which earthquakes are occurring in that region is greater than the rate before the mainshock.
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geopubs.wr.usgs.gov/open-file/of96-266/
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USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards ... Common Myths about Earthquakes...
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earthquake.usgs.gov/faq/
earthquake.usgs.gov/faq/
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USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards ... Here is a list of the earthquakes located by the USGS and contributing networks for the Map of Europe Region. Most recent events are at the top. (Some early events may be obscured by later ones on...
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earthquake.usgs.gov/eqcenter/recenteqsww/Maps/region/Eu...
earthquake.usgs.gov/eqcenter/recenteqsww/Maps/region/Europe_eqs.php
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After decades of failed efforts to predict when and where earthquakes will occur, scientists in Northern Ireland are trying to do the next best thing -- estimate the probability of deadly aftershocks. ... Steacy told the British Association of Science conference that it would be more realistic to try to predict aftershocks --
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www.cnn.com/2000/NATURE/09/11/earthquake.aftershock.reu...
www.cnn.com/2000/NATURE/09/11/earthquake.aftershock.reut/
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Part of living with earthquakes is living with aftershocks. Earthquakes come in clusters. In any earthquake cluster, the largest one is called the mainshock; anything before it is a foreshock, and anything after it is an aftershock.
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www.earthquakecountry.info/roots/basics.html
www.earthquakecountry.info/roots/basics.html
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