Now that USGS scientists are saying that the M8.7, March 28 quake was in fact an aftershock, others are still trying to figure out exactly why this earthquake did not produce a large tsunami. “There are puzzling aspects to the aftershock and to the virtually invisible tsunami that it created. It may be, said Eric Geist, a USGS geophysicist in Menlo Park, that the temblor directed truly significant ocean waves primarily toward the southwest, where they would encounter no land for many thousands of miles and therefore would not pile up to damaging heights.”
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