19 research outputs found
日本海東縁の活断層の潜航調査 -奥尻海嶺と佐渡海嶺との比較検討- / Dive survey of active fault scarps in the eastern margin of Japan Sea -comparison of Okushiri and Sado Ridge-
Heat Flow Distribution around the Joetsu Gas Hydrate Field, Western Joetsu Basin, Eastern Margin of the Japan Sea
Relationships between geological structure and earthquake source faults along the eastern margin of the Japan Sea
Tectonic, geochemical and biological studies in the eastern margin of the Japan Sea - preliminary results of Yokosuka / Shinkai 6500 YK01-06 Cruise -
高知沖trench slope breake上の海丘群の潜航調査 / Diving Survey of the Knolls on the Trench Slope Break off Kochi, Southwest Japan
北海道西方沖の地震震源域及び空白域の潜航調査 / Dive surveys of the seismic source area and seismic gap west of Hokkaido
Sedimentology, Holocene Sedimentation Rates, and Activity of Submarine Active Fault at West of Noto Peninsula
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