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The stability of gas hydrate field in the northeastern continental slope of Sakhalin Island, Sea of Okhotsk, as inferred from analysis of heat flow data and its implications for slope failures

Cited 30 time in wos
Cited 32 time in scopus
Title
The stability of gas hydrate field in the northeastern continental slope of Sakhalin Island, Sea of Okhotsk, as inferred from analysis of heat flow data and its implications for slope failures
Authors
Kim, Young-Gyun
Hitoshi Shoji
Alexander Salomatin
Anatoly Obzhirov
Boris Baranov
Jin, Young Keun
Lee, Sang-Mook
Keywords
Gas hydrate stability zoneOkhotsk SeaSakhalin continental slopeSlope failurebackground heat flow
Issue Date
2013
Publisher
Elsevier
Citation
Kim, Young-Gyun, et al. 2013. "The stability of gas hydrate field in the northeastern continental slope of Sakhalin Island, Sea of Okhotsk, as inferred from analysis of heat flow data and its implications for slope failures". MARINE AND PETROLEUM GEOLOGY, 45(0): 198-207.
Abstract
The sudden release of methane from seas due to ocean warming and/or sea level drop, leading to extensive mass wasting at continental margins, has been suggested as a possible cause of global climate change. In the northeastern continental slope of the Sakhalin Island (Sea of Okhotsk), numerous gas hydrate-related manifestations have been reported, including hydroacoustic anomaly (gas flare) in the water column, pockmarks and mounds on the seafloor, seepage structures and bottom-simulating reflectors (BSRs). The gas hydrate found at 385 mbsl represents the shallowest occurrence ever recorded in the Okhotsk Sea. In this study, we modeled the gas hydrate stability zone (GHSZ) using methane gas composition, water temperature and geothermal gradient to see if it is consistent with the observed depth of the BSR. An important distinction can be made between the seafloor containing seepage features and normal seafloor in terms of their thermal structure. The depth of the BSR matches well with the base of GHSZ estimated from the background heat flow (geothermal gradient). A large slope failure feature is found in the northern Sakhalin continental slope. We explore the possibility that this failure was caused by gas hydrate dissociation, based on the past climate change history and inference from the GHSZ calculation. Prediction of the natural landslide is difficult however, new stratigraphic evidence from subbottom profiles suggests that the landslide occurred at 20 ka which is roughly consistent with the late stage of the Last Glacial Maximum.
URI
https://repository.kopri.re.kr/handle/201206/7238
DOI
http://dx.doi.org/10.1016/j.marpetgeo.2013.05.003
Type
Article
Indexed
SCI
Appears in Collections  
2012-2013, Russia Sakhalin Slope Methane hydrate International Research Project (12-13) / Jin, Young Keun (PN12020)
2011-2016, Korea Polar Ocean in Rapid Transition (K-PORT) / Kang, Sung-Ho (PM11080; PM12020; PM13020; PM14040; PM14040; PM15040)
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