These primary quakes then generate large numbers of aftershocks -- secondary shocks that can occur at some distance from the earthquake's epicentre and also up to a day or two later. ... The results could also have implications for predicting where aftershocks will occur once an earthquake has started say the researchers:
physicsworld.com/cws/article/news/25090
Q: What is an earthquake and what causes them to happen? ... Aftershocks are smaller earthquakes, which occur in the same general area during the days to years following a larger event or "mainshock", defined as within 1-2 fault lengths away and during the period of time before the background seismicity level has resumed.
www.sristi.org/dmis/causes_earthquake www.sristi.org/dmis/causes_earthquake
physicsweb.org — Geophysicists in the US have found that the "aftershocks" produced by earthquakes are triggered by "dynamic" seismic waves from the main shock rather than changes in stress in nearby faults brought about by the rearrangement of the Earth's crust, as previously believed.
digg.com/general_sciences/A_New_Theory_on_What_Causes_Q... digg.com/general_sciences/A_New_Theory_on_What_Causes_Quake_Aftershocks
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S. E. Hough and L. M. Jones United States Geological Survey, 525 S. Wilson Ave, Pasadena CA, 91106 We tend to view aftershocks as afterthoughts, in both their scientific and societal impact and importance.
pasadena.wr.usgs.gov/hough/eos.html
It has been debated whether other phenomena that involve earthquake clustering, such as foreshock-mainshock pairs and earthquake doublets and multiplets simply result from the same process that causes aftershocks, or are a separate type of special phenomena.
pasadena.wr.usgs.gov/office/kfelzer/agu2002.html
What are aftershocks and what causes them? Aftershocks are earthquakes on a smaller scale after the main quake. They happen because the newly moved rock have to be settled.... ... Aftershocks are earthquakes on a smaller scale after the main quake. They happen because the newly moved rock have to be settled.
www.answerbag.com/q_view/7291
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The work in this project focuses on the most basic question of whether static or dynamic stresses are most important for the triggering of near to mid-field aftershocks. Previous work in this area has found that both static and dynamic stress changes may explain the azimuthal distribution of aftershocks.
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