Resistivity structure in the western part of the fault repture zone associated with the 1999 Izmit earthquake and its seismogenic implication

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  • Tank S. B.
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology
  • Honkura Y.
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology
  • Ogawa Y.
    Volcanic Fluid Research Center, Tokyo Institute of Technology
  • Oshiman N.
    Disaster Prevention Research Institute, Kyoto University
  • Tuncçer M. K.
    Kandilli Observatory and Earthquake Research Institute, Bogazicçi University
  • Matsushima M.
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology
  • Çelik C.
    Kandilli Observatory and Earthquake Research Institute, Bogazicçi University
  • Isikara M.

書誌事項

タイトル別名
  • Resistivity structure in the western part of the fault rupture zone associated with the 1999 Izmit earthquake and its seismogenic implication
  • Resistivity structure in the western part of the fault rupture zone associated with the 1999 İzmit earthquake and its seismogenic implication
公開日
2003
DOI
  • 10.1186/bf03351777
公開者
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、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

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説明

Magnetotelluric (MT) surveys were carried out along some profiles crossing the fault rupture zone associated with the Izmit earthquake which took place on 17 August 1999 in the western part of the North Anatolian Fault Zone (NAFZ). In this paper, we focus on the western part of the fault rupture zone where two different groups of seismicity followed the Izmit earthquake. One group was seen along a narrow belt and corresponds to aftershocks occurring along the fault rupture zone. The other was seen in a circular region and represents a swarm activity, presumably triggered by the occurrence of the Izmit earthquake. Two-dimensional inversion was performed for the MT data acquired along two profiles; one crosses the western end of the fault rupture zone and the other is located in the west of the swarm activity area. In the former case, aftershocks tended to occur in a resistive zone underlain by a moderately conductive zone, as was the case for the hypocenter area. In the latter case, the swarm activity tends to be confined in a conductive zone below a highly resistive zone. This activity is likely to be triggered through pore-pressure changes associated with the Izmit earthquake.

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