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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24850

Title: Velocity Structure in Marine Sediments with Gas Hydrate Reflectors in Offshore SW Taiwan, from OBS Data Tomography
Authors: Win-Bin Cheng;Chao-Shing Lee;Char-Shine Liu;Philippe Schnürle;Shiao-Shan Lin;Hong-Ruai Tsai
Contributors: NTOU:Institute of Applied Geosciences
Keywords: Gas hydrates;OBS seismic data;Seismic tomography;Methane migration
Date: 2006-12-01
Issue Date: 2011-10-20T08:17:51Z
Publisher: Terrestrial, Atmospheric and Oceanic Sciences
Abstract: abstract:In the fall of 2004, four profiles of a total length of about 80 km and 24 recovered Ocean Bottom Seismometers (OBSs) were acquired along offshore southwestern Taiwan. These profiles were oriented in E-W and N-S directions to map the velocity structure of sediments by modeling the vertical component of OBS data. The thickness of sedimentary layers ranges from a few hundred meters to about 2 km, with the largest thickness being found beneath ridges. The most striking feature in the velocity models along E-W profiles is the relatively high velocity wedges, extending from the seafloor to about 2 km in depth; these could be interpreted as a series of westward upthrust faults. The feature of relatively high P-wave velocity could be considered a result of local shallowing of the base of the gas hydrate stability zone, caused by ascending flows of deep fluids passing through the fault zone. In the N-S profiles, a dome-like high velocity structure was observed and could be associated with the phenomenon of hydrate/gas phase boundary fluctuation. After erosion, the sub-seafloor temperature gradient redistributes and results in the hydrate/gas phase boundary moving downward. The results obtained in this study show that tectonic control is an important factor in determining bottom-simulating reflector (BSR) distributions offshore of southwestern Taiwan.
Relation: 17(4), pp.739-756
URI: http://ntour.ntou.edu.tw/handle/987654321/24850
Appears in Collections:[應用地球科學研究所] 期刊論文

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