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Science 13 December 1996:
Vol. 274. no. 5294, pp. 1891 - 1894
DOI: 10.1126/science.274.5294.1891
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Reports

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

Dapeng Zhao, * Hiroo Kanamori, Hiroaki Negishi, Douglas Wiens

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.

D. Zhao and D. Wiens, Department of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130, USA.
H. Kanamori, Seismological Laboratory 252-21, California Institute of Technology, Pasadena, CA 91125, USA.
H. Negishi, Disaster Prevention Research Institute, Kyoto University, Uji 611, Japan.
*   To whom correspondence should be addressed. E-mail: dapeng{at}izu.wustl.edu

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