Coseismic Slip Distribution of the 2005 Miyagi-Oki (<i>M</i> 7.2) Earthquake Estimated by Inversion of Strong-motion and Teleseismic Waveforms

DOI Web Site 3 Citations 40 References
  • YAGINUMA Tadashi
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
  • OKADA Tomomi
    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
  • KATO Kenichi
    Kobori Research Complex, Kajima Corporation
  • TAKEMURA Masayuki
    Kobori Research Complex, Kajima Corporation
  • YAGI Yuji
    Graduate School of Life and Environmental Sciences, University of Tsukuba

Bibliographic Information

Other Title
  • 近地・遠地地震波形インヴァージョンによる 2005年宮城県沖の地震（<i>M</i> 7.2）の地震時すべり量分布
  • 近地・遠地地震波形インヴァージョンによる2005年宮城県沖の地震(M7.2)の地震時すべり量分布--1978年宮城県沖地震(M7.4)との関係
  • キンチ エンチ ジシン ハケイ インヴァージョン ニ ヨル 2005ネン ミヤギケンオキ ノ ジシン M7 2 ノ ジシンジ スベリリョウ ブンプ 1978ネン ミヤギケンオキ ジシン M7 4 トノ カンケイ
  • Coseismic Slip Distribution of the 2005 Miyagi-Oki (M 7.2) Earthquake Estimated by Inversion of Strong-motion and Teleseismic Waveforms
  • —Its Relation with the 1978 Miyagi-Oki Earthquake (<i>M</i> 7.4) —
  • —1978年宮城県沖地震（<i>M</i> 7.4）との関係—

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Abstract

On August 16, 2005, a large earthquake (M 7.2) occurred along the plate boundary of off Miyagi Prefecture (Miyagi-Oki), northeastern Japan. In this area, large earthquakes (∼M 7.5) have occurred repeatedly at intervals of about 37 years, and it has passed more than 27 years since this event occurred. To understand the relation between this earthquake and the previous 1978 event, we estimated the coseismic slip distribution of the 2005 Miyagi-Oki earthquake by the seismic waveform inversion method. We used the same structure model used in the analysis of the 1978 event. By comparing the coseismic slip distribution of the 2005 Miyagi-Oki earthquake of this study with those of previous studies, we investigated the reliability and our result seems to be plausible. Then we compared our result with the previous 1978 Miyagi-Oki earthquake and found that the rupture area of the 2005 event overlapped with the southeastern part of the 1978 earthquake’s rupture area. This result supports the idea that there exist plural asperities which cause the sequence of Miyagi-Oki earthquake, and the 2005 event ruptured part of such asperities, while the previous 1978 event ruptured all of the prural asperities at one time.

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