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Investigation of the Three-Dimensional Fault Geometry Ruptured by the 1995 Hyogo-Ken Nanbu Earthquake Using Strong-Motion and Geodetic Data

Department of Geophysics
Kyoto University
Oiwake-cho
Kitashirakawa, Sakyo-ku
Kyoto City, 606-8502 Japan
cho{at}eos.hokudai.ac.jp
ichiro{at}kugi.kyoto-u.ac.jp

Manuscript received 15 June 1999.

The fault geometry of the 1995 Hyogo-ken Nanbu earthquake in Japan is investigated from the perspective of three-dimensional moment distribution, which in turn is estimated using a linear inversion of strong-motion and geodetic data, without regard to aftershock distribution. The inversion result is evaluated with numerical tests in which intentional modeling errors are given on purpose. In regions shallower than about 9 km, faults on the southwestern and northeastern sides dip toward the southeast and northwest, respectively. Fault segments show a clear stepover at a depth shallower than about 9 km and coalesce into a single fault at a depth of about 14 km. The fault geometry is compared with the distribution of aftershocks that occurred within two hours after the main shock. This shows that aftershocks cluster near the bends and the edges of the main faults. These results imply that the main cause of the aftershocks is the concentration of stresses induced by the main shock.

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