Episodic seafloor mud brecciation due to great subduction zone earthquakes
書誌事項
- 公開日
- 2011-09-02
- 資源種別
- journal article
- DOI
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- 10.1130/g32043.1
- 公開者
- Geological Society of America
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説明
The Nankai Trough off southwest Japan has an ∼1300 yr historical record of great earthquakes, including the most recent, the A.D. 1944 Tonankai (M = 8.2) earthquake. Evaluation of the activity of an individual submarine fault is difficult when only onland observations are available. Submarine core records can pinpoint individual fault activity. Here we present Integrated Ocean Drilling Program (IODP) Nankai Trough Seismogenic Zone Experiment data from the shallow portion. IODP Expedition 316 drilled and cored several holes in the shallow portion of the offshore Tonankai earthquake area, including sites in the hanging wall of a margin-dominating splay fault that has previously been interpreted to have ruptured coseismically during megathrust earthquakes. X-ray computed tomography scanning revealed that the uppermost core at one site contains repeated occurrences of mud breccia. Radioisotope dating of the uppermost mud breccia indicates a deposition time consistent with the 1944 Tonankai earthquake, suggesting that the mud-breccia layers result from episodic brecciation caused by seismic shaking. Mud brecciation provides a potential new tool to reconstruct ancient earthquake history in subduction zones.
収録刊行物
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- Geology
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Geology 39 (10), 919-922, 2011-09-02
Geological Society of America
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詳細情報 詳細情報について
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- CRID
- 1360846643404863744
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- NII論文ID
- 10030744591
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- DOI
- 10.1130/g32043.1
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- ISSN
- 19432682
- 00917613
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- CiNii Articles
- KAKEN
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