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タイトル: 能登半島西方沖の堆積作用・完新世堆積速度と活断層の活動間隔
その他のタイトル: Sedimentology, Holocene Sedimentation Rates, and Activity of Submarine Active Fault at West of Noto Peninsula
著者: 池原, 研
井上, 卓彦
村上, 文敏
岡村, 行信
著者(別言語): Ikehara, Ken
Inoue, Takahiko
Murakami, Fumitoshi
Okamura, Yukinobu
キーワード: sedimentation rate
ravinement surface
active fault
radiocarbon age determination
2007 Noto-hanto Earthquake
発行日: 2007年
出版者: 地震研究所
掲載誌情報: 地震研究所彙報. 第82号第4冊, 2007, pp. 313-319
抄録: Five sediment cores were collected from the shelf west of Noto Peninsula where the submarine active fault that generated the 2007 Noto-hanto earthquake is located, to clarify the activity of the fault. A total of 32 radiocarbon age determinations using molluscan and echinoderm shells sug-gested that the average sedimentation rate during the Holocene in the study area was around 200cm/ky. Judging from the sedimentation rate and sediment thickness above a ravinement surface, the age of the surface was calculated to be 11.6-15.8ka. This shows that the surface was formed according to the postglacial transgression after the last glacial maximum. Using the sedimentation rate, the fault activities recorded in the seismic reflection profiles occurred at around 2-3ky intervals in Holocene. Precise age determination allows us to estimate the ages of reflectors in the seismic reflection profiles and give us information on submarine fault activities.
URI: http://hdl.handle.net/2261/15599
ISSN: 00408992


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