STRESS TRIGGERING—The March 28 earthquake occurred to the south of the December 2004 earthquake rupture zone, supporting the theory that the 2005 earthquake may have been triggered by the 2004 quake. Such stress triggering behavior is very similar to a sequence of thrust earthquakes in central California in the 1980s, reported by Lin and Stein in 2004. The small yellow circles in the pink rupture zone, which is many times larger than the 2005 rupture zone shown in blue, represent aftershocks within the first three weeks after the Dec. 26 earthquake. The data were provided by the U.S. Geological Survey. (Illustration by Jack Cook, WHOI)[back]
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