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Appearance of seepage structures on the NE Sakhalin slope: differences and similarities in gas discharge.

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Title
Appearance of seepage structures on the NE Sakhalin slope: differences and similarities in gas discharge.
Other Titles
사할린 북동 대륙사면의 가스분출구 출현: 가스 분출의 같은 점과 다른 점
Authors
B. Baranov
A. Obzhirov
H. Shoji
Jin, Young Keun
Keywords
NE Sakhalin Slope; gas hydrate; methane; seepage
Issue Date
2010
Citation
B. Baranov, et al. 2010. Appearance of seepage structures on the NE Sakhalin slope: differences and similarities in gas discharge.. 10th International Conference on Gas in Marine Sediments. 10th International Conference on Gas in Marine Sediments. 2010.09.08~.
Abstract
Data considered were obtained in several cruises during side-scan sonar surveys carried on NE Sakhalin slope in the framework of Korean-Japanese-Russian projects CHAOS (Hydro Carbone Hydrate Accumulation in the Okhotsk Sea, 2003-2005) (Matveeva et al., 2005) and SSGH (Sakhalin Slope Gas Hydrate, 2004-2009) (Jin et al., 2007, 2008
Shoji et al., 2008). The towed hydroacoustic system “SONIC-3M” designed in VNIIOkeangeologia (Saint-Petersburg) was used for side-scan sonar mapping (Gladysh et al., 2008). Gas discharge places appear on the side-scan sonar images as a spots of high backscatter intensity, which are considered as seepage structures (S-structures). Total square of the area mapped by side-scan sonar on the slope amounts to 2600 km2. 739 S-structures were observed in depth interval 350-1200 m. Data obtained show that S-structures are spread everywhere on the north-eastern Sakhalin slope, but their appearances strongly vary from one place to another one that are connected to changes of slope structure. The main change was observed at crossing of Lavrentiev Fault that separates slope on northern and southern segments (Fig. 1). Differences in relief morphology and sedimentary cover structure suggest that slope failure occurred in the northern segment, whereas the southern segment remained stabile.
URI
http://repository.kopri.re.kr/handle/201206/8065
Conference Name
10th International Conference on Gas in Marine Sediments
Conference Place
10th International Conference on Gas in Marine Sediments
Conference Date
2010.09.08~
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