Tomography of the Source Area of the 1995 Kobe Earthquake: Evidence for Fluids at the Hypocenter?

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Science  13 Dec 1996:
Vol. 274, Issue 5294, pp. 1891-1894
DOI: 10.1126/science.274.5294.1891


Seismic tomography revealed a low seismic velocity (−5%) and high Poisson's ratio (+6%) anomaly covering about 300 square kilometers at the hypocenter of the 17 January 1995, magnitude 7.2, Kobe earthquake in Japan. This anomaly may be due to an overpressurized, fluid-filled, fractured rock matrix that contributed to the initiation of the Kobe earthquake.

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