Deep low-frequency earthquakes near the downward extension of the seismogenic fault of the 2000Western Tottori earthquake
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- Ohmi Shiro
- Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University
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- Hirose Issei
- Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University
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- Mori James J.
- Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University
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Deep low-frequency (DLF) events have often been discussed in association with fluid (magma) activity around volcanoes, in this paper, however, we will show another example of DLF activity beneath active faults. On October 6, 2000, a Mw=6.7 crustal earthquake occurred in the western Tottori, southwest Japan. Beneath the focal region of the earthquake, DLF earthquakes had been observed prior to the mainshock and the activity increased after the mainshock. The events are distributed around 30 km depth and seem to be located around the downward extension of the seismogenic fault. Three types of DLF events have been observed and their seismological features indicate fluid activity around the focal region of the DLF events. If the downward extension of the seismogenic fault in the lower crust exists, fluid activity indicated by the DLF events possibly affect the aseismic slip process of the deep portion of the fault and likely control the occurrence of the earthquakes on the seismogenic portion of the fault.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 56 (12), 1185-1189, 2004
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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詳細情報 詳細情報について
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- CRID
- 1390282681489280768
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- NII論文ID
- 10017466928
- 130003781014
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 7279514
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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