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What was the background seismicity in the region before the M9.0 earthquake?

April 26, 2017background earthquake region seismicity

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What was the background seismicity in the region before the M9.0 earthquake?

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This table represents the number of earthquakes in the aftershock zone of the magnitude 9.0 earthquake on 12/26/04 for the ten previous years. The numbers of earthquakes located in 2004 does NOT reflect the main shock or aftershocks from the 9.0. The region encompasses a rectangular box which extends from 2N to 14N and from 92E to 98E. These statistics were obtained from the USGS PDE earthquake catalog search page.