Three-dimensional seismic velocity structure as determined by double-difference tomography in and around the focal area of the 2005 West off Fukuoka Prefecture earthquake

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概要

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• On March 20, 2005 theWest off Fukuoka Prefecture earthquake (magnitude of 7.0 on the JMA scale) occurred in southeastern Japan. The earthquake fault was a left-lateral strike-slip having a nearly vertical fault plane and a strike in the WNW-ESE direction. The largest aftershock with a magnitude of 5.8 (JMA) followed 1 month later. To gain more detailed aftershock data, several teams from different Japanese universities jointly installed a number of temporary seismic stations and positioned Ocean Bottom Seismometers (OBSs) immediately above the focal area. Double-difference tomography was used to estimate the three-dimensional (3D) (Zhang and Thurber, 2003) velocity structures in and around the focal area based on the travel time data collected during seismic observations. The high-velocity regions estimated by the inversion are located on the edge of the aftershock area and on the shallow part of asperity, as inferred from the slip distribution. Conversely, the <I>Vp</I>/<I>Vs</I> ratio is not always as high as that found at the location of the asperity. This finding suggests that the construction of the medium is not uniformly elastic but complex, with different relations between elastic constants and strength.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• TAKAHASHI H.

  Instituto Nacional de Pesquisas Espaciais, INPE

• Miyamachi H.

  Faculty Of Science Kagoshima University

• HORI M.

  Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University

• MATSUMOTO S.

  Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University

• OKADA T.

  Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To

• YAMADA T.

  Earthquake Research Institute, University of Tokyo

• SHINOHARA M.

  Earthquake Research Institute, University of Tokyo

• WATANABE A.

  Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University

• KANAZAWA T.

  Earthquake Research Institute, University of Tokyo

• SHIMIZU H.

  Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University

• Matsuwo N.

  Institute Of Seismology And Volcanology Faculty Of Sciences Kyushu University

• Nakahigashi K.

  Earthquake Research Institute University Of Tokyo

• Uehira K.

  Institute Of Seismology And Volcanology Faculty Of Sciences Kyushu University

• Iio Y.

  Research Center For Earthquake Prediction Disaster Prevention Research Institute Kyoto University

• Matsushima T.

  Institute Of Seismology And Volcanology Faculty Of Sciences Kyushu University

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