Imaging the Fault Planes of the 2004 Mid Niigata Prefecture (Niigata-Chuetsu) Earthquake Sequence by Applying Double-Difference Tomography to Dense Temporary Observation Network Data

DOI Web Site Web Site 2 Citations 27 References
  • OKADA Tomomi
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • UMINO Norihito
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • MATSUZAWA Toru
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • NAKAJIMA Jun'ichi
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • UCHIDA Naoki
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • NAKAYAMA Takashi
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • HIRAHARA Satoshi
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • SATO Toshiya
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • HORI Shu'ichiro
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • KONO Toshio
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • YAGINUMA Tadashi
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • HASEGAWA Akira
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • ASANO Youichi
    National Research Institute for Earth Science and Disaster Prevention
  • ZHANG Haijiang
    University of Wisconsin-Madison, Department of Geology and Geophysics
  • THURBER Clifford H.
    University of Wisconsin-Madison, Department of Geology and Geophysics

Bibliographic Information

Other Title
  • 稠密余震観測データを用いたダブル・ディファレンス・トモグラフィー法による2004年新潟県中越地震の震源断層のイメージング
  • チュウミツヨシン カンソク データ オ モチイタ ダブル ディファレンス トモグラフィーホウ ニ ヨル 2004ネン ニイガタケン チュウエツ ジシン ノ シンゲン ダンソウ ノ イメージング

Search this article

Abstract

We obtained detailed aftershock distribution and three-dimensional seismic velocity structure in and around the focal area of the 2004 Mid Niigata Prefecture (Niigata-Chuetsu) earthquake (M6.8) by inverting travel time data from a dense observation network and surrounding permanent stations. We adopted double-difference tomography method for the inversions. The fault planes of the main shock and the largest aftershock, which are delineated by two parallel aftershock alignments, took place where seismic velocity changes abruptly at the boundary between the lower velocity hanging wall and the higher velocity footwall for both P- and S-waves. The seismic velocity structure changes along the strike of the faults. The major velocity boundary zone between the lower velocity hanging wall and the higher velocity footwall migrates to the west at a location near the central part of the focal area, where the main shock hypocenter is located. Some parts of the fault planes, e. g. around the hypocenter of the M6 aftershock on Oct. 27, are imaged as low velocity zones. Asperity (large coseismic slip area) of the main shock seems to correspond with a higher velocity portion along the fault plane.

Journal

Citations (2)*help

See more

References(27)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top