Differences in Quakes
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Differences in Quakes

February 21, 2011
Researchers found differences between the rocks in the regions where the 2004 and 2005 Sumatran earthquakes occurred. In the southern part of the region where the 2004 earthquake occurred, the earthquake rupture began closer to shore and did not reach as far seaward. Comparatively, the 2005 earthquake ruptured farther seaward beneath a thick wedge of compacted sedimentary rocks. These differences help explain why the 2004 earthquake and ensuing tsunami were more severe than subsequent events in 2005.

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