Origin of the concentrated deformation zone in the Japanese Islands and stress accumulation process of intraplate earthquakes
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- Iio Yoshihisa
- Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University
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- Sagiya Takeshi
- Research Center for Seismology, Volcanology and Disaster Mitigation, Nagoya University
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- Kobayashi Yoji
- Institute for Geoscience, University of Tsukuba
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The nature and origin of the concentrated deformation zone along the Japan Sea coast (NKTZ: Niigata-Kobe Tectonic Zone) were clarified by analyzing various observations. We made a qualitative modeling for the stress state and deformation style in and around the NKTZ. In this model a weak zone with low viscosity exists in the lower crust beneath the NKTZ. In the surrounding region, however, the viscosity in the lower crust is very high and can be regarded as elastic for the periods of a recurrence interval of intraplate earthquakes. The concentrated deformation is basically attributed to the low viscosity in the weak zone. In more details, the concentrated deformation is thought to be generated by a postseismic deformation of the weak zone to the previous large intraplate earthquake in the interseismic period (the brittle-ductile interaction model) and/or anelastic deformation in both the upper and lower crusts in the NKTZ, under a finite constant force (the anelastic deformation model).
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 56 (8), 831-842, 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
- 1390001206513487360
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- NII論文ID
- 10017465467
- 130003781052
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 7079356
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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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