Seismological evidence indicating rupture along an eastward dipping fault plane for the 1964 Niigata, Japan earthquake.

  • MORI Jim
    Lamont-Doherty Geological Observatory and Department of Geological Sciences of Columbia University
  • BOYD Thomas
    Lamont-Doherty Geological Observatory and Department of Geological Sciences of Columbia University

Bibliographic Information

Other Title
  • Seismological evidence indicating rupture along an eastward dipping fault plane for the 1964 Niigata

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Description

The Niigata earthquake of June 16, 1964. (M8=7.5) is studied using a body-wave inversion technique on teleseismic P waveforms of the mainshock and a joint hypocenter determination of 27 of the largest (MJMA≥4.0) regionally recorded aftershocks. The mainshock is interpreted as being composed of two subevents with moments of 2.1×1026 dyn-cm and 2.0×1027 dyn-cm. The focal mechanism indicates that faulting could have occurred on either a plane dipping toward the west or a plane dipping toward the east. The initial subevent is located at a depth of 8 to 13 km, while the centroid of the second sub-event is located 27 km southwest of the first and at a depth of 3 km. The relocated aftershocks all appear to have depths of less than 15 km which is consistent with the depths obtained for the mainshock. They appear to define a trend dipping shallowly toward the east which is consistent with the relative locations of the two subevents comprising the mainshock. We conclude, therefore, that a fault plane dipping toward the east is more consistent with the relative locations of the two subevents and the relocations of the aftershocks.

Journal

  • Journal of Physics of the Earth

    Journal of Physics of the Earth 33 (3), 227-240, 1985

    The Seismological Society of Japan, The Volcanological Society of Japan, The Geodetic Society of Japan

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Details 詳細情報について

  • CRID
    1390282681487681280
  • NII Article ID
    130003785262
  • DOI
    10.4294/jpe1952.33.227
  • ISSN
    18842305
    00223743
  • Text Lang
    en
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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