Seismic indicators of gas hydrate and associated gas in the Ulleung Basin, East Sea (Japan Sea) and implications of heat flows derived from depths of the bottom-simulating reflector SCIE SCOPUS

Cited 74 time in WEB OF SCIENCE Cited 78 time in Scopus
Title
Seismic indicators of gas hydrate and associated gas in the Ulleung Basin, East Sea (Japan Sea) and implications of heat flows derived from depths of the bottom-simulating reflector
Author(s)
Horozal, Senay; Lee, Gwang H.; Yi, Bo Y.; Yoo, Dong G.; Park, Keun P.; Lee, Ho Y.; Kim, Wonsik; Kim, Han J.; Lee, Keumsuk
KIOST Author(s)
Kim, Han Joon(김한준)
Publication Year
2009-03-15
Abstract
Analysis of multi-channel seismic reflection data from the Ulleung Basin, East Sea (Japan Sea), reveals various seismic indicators of gas hydrate and associated gas, including the bottom-simulating reflector (BSR), enhanced reflections below the BSR, and seismic chimneys. The recent recovery of massive gas hydrate by drilling, together with these seismic indicators, strongly suggests favorable conditions for the formation of gas hydrate in the area. The BSR is most common and of a wide range of amplitude and continuity. Seismic chimneys, characterized by columnar zones of amplitude reduction, terminate mostly within the gas hydrate stability zone (GHSZ), but a few extend to pockmarks or mounds on the seafloor. Seismic chimneys with seafloor expressions probably represent vertical vents for gas originating from below the GHSZ. The increase in the degree of amplitude reduction in seismic chimneys with increasing seismic frequency may be due to seismic attenuation by gas bubbles trapped in hydrate-filled/coated fractures in the GHSZ. BSR-derived heat flows range from about 65 to over 115 mW/m(2), comparable to those from direct measurements. Heat flows in the northern part of the study area are very high for the age of the basin, suggesting hotter than normal mantle temperature. The area of high (> 105 mW/m(2)) heat flows also coincides largely with the distribution of the presumed incipient oceanic crust, formed during the earliest stage of seafloor spreading. (C) 2008 Elsevier B.V. All rights reserved.
ISSN
0025-3227
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4315
DOI
10.1016/j.margeo.2008.12.004
Bibliographic Citation
MARINE GEOLOGY, v.258, no.1-4, pp.126 - 138, 2009
Publisher
ELSEVIER SCIENCE BV
Subject
METHANE HYDRATE; HYDROCARBON SEEPS; CONTINENTAL-SLOPE; SEDIMENTS; SIGNATURES; STABILITY; STRATIGRAPHY; CONSTRAINTS; EVOLUTION; BAIKAL
Keywords
Ulleung Basin; gas hydrate; BSR; seismic chimney; heat flow
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Marine Geophysics,Marine Active Fault Study,Exploration Seismology,해양지구물리,해저단층연구,탄성파탐사

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