Very low frequency earthquake excited by the 2004 off the Kii peninsula earthquake: a dynamic deformation process in the large accretionary prism
-
- Obara Kazushige
- National Research Institute for Earth Science and Disaster Prevention
-
- Ito Yoshihiro
- National Research Institute for Earth Science and Disaster Prevention
書誌事項
- タイトル別名
-
- Very low frequency earthquakes excited by the 2004 off the Kii peninsula earthquakes: A dynamic deformation process in the large accretionary prism
この論文をさがす
抄録
Anomalous seismic events were observed after the occurrence of the foreshock (Mw=7.2) and the main shock (Mw=7.5) of the 2004 off the Kii peninsula earthquakes. These anomalous events are characterized by very low-frequency energy of around 10 seconds with almost no higher-frequency energy and are considered the same as the very low-frequency (VLF) earthquakes discovered by Ishihara (2003) in some places along the Nankai trough, southwest Japan. The VLF seismic activity is mainly coincident with the aftershock area of the 2004 off the Kii peninsula earthquakes; however a minor activity was also excited in the southern Kii channel area. The VLF seismograms sometimes include higher-frequency wave trains with amplitudes much smaller than that of regular aftershocks. This indicates that VLF earthquakes have different source properties from the regular earthquakes. The centroid moment tensor analysis for one of the larger events suggests that the source depth is very shallow and the focal mechanism is the reverse faulting. These features suggest that the event occurs on the well-developed reverse fault system in the large accretionary prism near the Nankai trough. The swarm activity of VLF earthquakes might be considered as a chain-like occurrence of slips on the reverse fault system and thus the signature of a dynamic deformation process in the accretionary prism.
収録刊行物
-
- Earth, Planets and Space
-
Earth, Planets and Space 57 (4), 321-326, 2005
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
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390001206512583680
-
- NII論文ID
- 10017468479
- 130003956487
-
- NII書誌ID
- AA11211921
-
- ISSN
- 18805981
- 13438832
- http://id.crossref.org/issn/13438832
-
- NDL書誌ID
- 7310890
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可