平成19年(2007年)能登半島地震合同余震観測

概要

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The 2007 Noto Hanto Earthquake occurred on March 25, 2007, in the Noto Peninsula, central Japan. A half day after the main shock, we started installing temporary seismic stations in order to determine the precise locations of its aftershocks. Ten universities and two research institutes deployed 89 temporary seismic stations in and around the source area. The observation lasted for about two months. We relocated 1318 aftershocks with arrival time corrections at each station. The relocated hypocenters show relatively small errors, less than 0.2km in the horizontal direction and less than 0.4km depth. Most of the relocated hypocenters are about 2.0km shallower than those determined by JMA. The precise aftershock distribution extends into a shallower area than the original, and it coincides with sea floor ward extension of the active faults previously known by a sonic reflection survey
東京大学の論文
2008-02-25