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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
利用海底地震儀資料反演臺灣西南海域含天然氣水合物沉積層速度構造
Authors: Win-Bin Cheng;Chao-Shing Lee;Char-Shine Liu;Philippe Schnürle;Shiao-Shan Lin;Hong-Ruai Tsai
Contributors: NTOU:Institute of Applied Geosciences
國立臺灣海洋大學:應用地球科學研究所
Keywords: Gas hydrates;OBS seismic data;Seismic tomography;Methane migration
海底地震儀;臺灣西南海域;天然氣水合物
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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