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CHANGE OF GAS HYDRATE STABILITY ZONE IN THE NORTHEASTERN CONTINENTAL SLOPE OF SAKHALINS ISLAND, SEA OF OKHOTSK AND ITS IMPLICATIONS FOR SLOPE FAILURE

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Title
CHANGE OF GAS HYDRATE STABILITY ZONE IN THE NORTHEASTERN CONTINENTAL SLOPE OF SAKHALINS ISLAND, SEA OF OKHOTSK AND ITS IMPLICATIONS FOR SLOPE FAILURE
Other Titles
CHANGE OF GAS HYDRATE STABILITY ZONE IN THE NORTHEASTERN CONTINENTAL SLOPE OF SAKHALINS ISLAND, SEA OF OKHOTSK AND ITS IMPLICATIONS FOR SLOPE FAILURE
Authors
Kim, Young-Gyun
Kang, Seung-Goo
Lee, Sang-Mook
Boris BARANOV
Anatoly OBZHIROV
Alexander SALOMATIN
Hitoshi SHOJI
Jin, Young Keun
Keywords
Last Glacial Maximum; Marine heat flow; Northeasetern Sakhalin continental slope; Sea of Okhotsk; gas hydrate stability zone; slope failure
Issue Date
2014
Citation
Kim, Young-Gyun, et al. 2014. CHANGE OF GAS HYDRATE STABILITY ZONE IN THE NORTHEASTERN CONTINENTAL SLOPE OF SAKHALINS ISLAND, SEA OF OKHOTSK AND ITS IMPLICATIONS FOR SLOPE FAILURE. The 8th International Conference on Gas Hydrate. China National Convention Center. 2014.07.28~2014.08.01.
Abstract
The sudden dissociation of gas hydrate within sediments at continental margin due to ocean warming and/or sea level drop has been suggested as a possible cause of global climate change as well as extensive slope failure. In the northeastern continental slope of the Sakhalin Island (Sea of Okhotsk), numerous gas hydrate-related manifestations in addition to gas hydrates have been reported, which include hydroacoustic anomaly through the water column, pockmarks and mounds on the seafloor, seepage structure and bottom-simulating reflectors (BSRs) in the sediment. The gas hydrate found at 385 mbsl is the shallowest occurrence ever reported in the Sea of Okhotsk. BSR depths matches well with the base of gas hydrate stability zone (BGHSZ) estimated under the current environmental conditions such as gas composition, water temperature and the background geothermal gradient. In terms of thermal structure, an important distinction can be made between seafloors containing the seepage structure or none. We explore the timing of a large slope occurred in the study area using new stratigraphic evidence from subbottom profiles. The timing of the failure seems to be much younger, 20 ka roughly corresponding to the late stage of the Last Glacial Maximum, than the previous estimate, older than 350 ka. The extent of the slope failure occurs up to much shallower depth than the intersection depth of BGHSZ with the seafloor at 20 ka, possibly indicating complexity of natural landslides. Furthermore, this region has witnessed a rapid sea water temperature increase in the last 50 years. If such a trend continues, additional slope failure can be expected in the near future, considering that the region is not far from a transform plate boundary where shallow seismicity occurs. It is noted that the contents consist of the published material [1] together with newly-added discussion on the possibility of future slope failure in the study area.
URI
http://repository.kopri.re.kr/handle/201206/7073
Conference Name
The 8th International Conference on Gas Hydrate
Conference Place
China National Convention Center
Conference Date
2014.07.28~2014.08.01
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