Slip distribution of the 2003 Tokachi-oki earthquake estimated from tsunami waveform inversion

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  • Tanioka Yuichiro
    Institute of Seismology and Volcanology, Hokkaido University
  • Hirata Kenji
    Deep Sea Research Department, Japan Marine Science and Technology Center
  • Hino Ryota
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Tohoku University
  • Kanazawa Toshihiko
    Earthquake Research Institute, The University of Tokyo

書誌事項

公開日
2004
DOI
  • 10.1186/bf03353067
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

The slip distribution of the 2003 Tokachi-oki earthquake is estimated from the 11 tsunami waveforms recorded at 9 tide gauges in the southern Hokkaido and eastern Tohoku coasts and two ocean bottom tsunami-meters (pressure gauges) off Kamaishi, Tohoku. The largest slip of 4.3 m is estimated on the subfault located off Hiroo. A large slip of 2.1 m is also estimated on the subfault located near Kushiro. The total seismic moment of the 2003 Tokachi-oki earthquake is 1.0 × 1021 Nm. The slip distribution estimated from the tsunami waveform inversion is similar to the slip distribution deduced by Yamanaka and Kikuchi (2003) from the inversion of the teleseismic body waves. The rupture area of the 2003 Tokachi-oki earthquake is similar to the western part of the rupture area of the 1952 Tokachi-oki earthquake estimated by Hirata et al. (2003).

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