Attenuation of Seismic Waves along the Rokko Fault Zone

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  • NAKAMURA Shuichi
    Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University
  • KUBO Atsuki
    Earth Sciences Division, National Institute of Polar Research
  • OHKURA Takahiro
    School of Earth Sciences, Faculty of Integrated Human Studies, Kyoto University
  • OUCHI Toru
    Research Center for Urban Safety and Security, Kobe University

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  • 六甲断層帯沿いの地震波の減衰
  • ロッコウ ダンソウタイ ゾイ ノ ジシンハ ノ ゲンスイ

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Abstract

To investigate the effect of the Rokko fault zone on seismic wave attenuation, we estimated temporal coda attenuation and apparent body wave attenuation in the crust beneath Kobe area, Japan. We analyzed 153 aftershock seismograms of the 1995 Hyogo-ken Nanbu Earthquake (Jan. 17, MJMA=7.2) for the frequency ranges 1.5≤f≤24Hz. The Qc-1 depends strongly on frequency: Qc-1=0.057f-1.13 at lapse time 20s. The Qp-1 and Qs-1 are expressed as Qp-1=0.057f-0.96 and Qs-1=0.017f-0.72, respectively. Qc-1 values estimated in the aftershock area are nearly the same as those estimated in the Kinki district. On the other hand, Qs-1 values are larger than those of the Kinki area and other regions.<BR>These results suggest that the Rokko fault zone attenuates the amplitude of direct S waves more strongly than average crust does, but the fault zone does not affect coda Q.

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