KOPRI Repository

Change of Gas Hydrate Stability Zone in the Northeastern Continental Slope of Sakhalin Island, Sea of Okhotsk and Its Implications for Slope Failure

Metadata Downloads
Title
Change of Gas Hydrate Stability Zone in the Northeastern Continental Slope of Sakhalin Island, Sea of Okhotsk and Its Implications for Slope Failure
Authors
Kim, Young-Gyun
Jin, Young Keun
Baranov, Boris
Obzhirov, Anatoly
Salomatin, Alexander
Shoji, Hithosh
Lee, Sang-Mook
Kang, Seung-Goo
Keywords
Okhotsk Sea; R/V Akademic M. A.; Marine heat flow; Northeastern Sakhalin continental slope; Last Glacial Maximum; Slope failure; Gas hydrate stability zone
Issue Date
2014
Citation
Kim, Young-Gyun, et al. 2014. Change of Gas Hydrate Stability Zone in the Northeastern Continental Slope of Sakhalin Island, Sea of Okhotsk and Its Implications for Slope Failure. The 8th International Conference on Gas Hydrates (ICGH8-2014). Beijing. 2014.7.28-8.1.
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 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.
Conference Name
The 8th International Conference on Gas Hydrates (ICGH8-2014)
Conference Place
Beijing
Conference Date
2014.7.28-8.1
Files in This Item
General Conditions
      ROMEO Green
    Can archive pre-print and post-print or publisher's version/PDF
      ROMEO Blue
    Can archive post-print (ie final draft post-refereeing) or publisher's version/PDF
      ROMEO Yellow
    Can archive pre-print (ie pre-refereeing)
      ROMEO White
    Archiving not formally supported

    qrcode

    Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

    Browse