TXT-tool 3.081-1.3: A Hypothesis of the Senoumi Submarine Megaslide in Suruga Bay in Japan—Based on the Undrained Dynamic-Loading Ring Shear Tests and Computer Simulation
The Senoumi (stone flower sea), which is located in the Suruga Bay, has a distinctive bathymetric feature and a concave shape with the dimension approximately 30 km in width and 20 in length. The shape of Senoumi was believed as results of the intense tectonic activity in the plate border, the submarine slides and flows from the Oi River of Shizuoka Prefecture. This paper presents the study of Senoumi area as a submarine mega-slide by analyzing the shear behaviors of three samples through ring shear tests. One sample was drilled from the submarine floor by the Integrated Ocean Drilling Program (IODP), while two samples were taken from Omaezaki Hill near Senoumi area. The measured parameters from the ring shear tests then used as an input in the integrated model of landslide simulation (LS-RAPID) for the initiation and motion of earthquake-induced rapid landslide of Senoumi. We used the strong motion record of the 2011 Tohoku Earthquake at the observation point of MYG004 in Miyagi Prefecture. The results of this study indicated the importance of further investigation for the risk of large-scale submarine megaslide that may occur in the Senoumi area, including tsunami and the enlargement of submarine landslide into the adjacent coastal area particularly due to the mega earthquake in the Nankai Trough in the future.
KeywordsSubmarine landslide Undrained ring shear test Integrated Ocean Drilling Program (IODP) Computer simulation Earthquake-induced landslide
We acknowledge the SATREPS of the Government of Japan and two projects of the International Programme on Landslides (IPL-157 and IPL-161). Thanks go to R. Urgeles of the Institut de Ciences del Mar, Spain for information on marine landslides and T. Furumura of the Center for Integrated Disaster Information Research, the University of Tokyo for information on earthquake shaking. The authors thank to Y. Kaneda and M. Yasunaga as well as the ship and personnel of the Drilling Vessel Chikyu of the Japan Agency for Marine-Earth Science and Technology for their kind cooperation. The support from Croatian young researchers of Rijeka University during experiments is highly acknowledged. This research used data and samples provided by the Integrated Ocean Drilling Program (IODP) and the Geological Survey of Japan.
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