Journal
GEOSCIENCES JOURNAL
Volume 13, Issue 4, Pages 371-385Publisher
GEOLOGICAL SOCIETY KOREA
DOI: 10.1007/s12303-009-0039-8
Keywords
gas hydrates; cold vents; acoustic backscatter; Ulleung Basin; East Sea
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Funding
- Ministry of Knowledge Economy, Korea
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During the site survey for drill sites of the Ulleung Basin Gas Hydrate Expedition 1, near-seafloor gas hydrates were discovered in core sediments from basin plain (2010-2130 m water depth) and southern slope (820-1160 m). The gas hydrates were exclusively retrieved from the sites of high backscatter intensity anomalies of 13 kHz multi-beam echosounding, implying high seafloor reflectivity. In high-resoltition (2-7 kHz) subbottom profiles, the coring sites are also characterized by narrow (250-850 m wide) acoustic blank zones reaching seafloor, where they have surface expressions of low-relief (
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