NDLI: Velocity structure and gas hydrate saturation estimation on active margin off SW Taiwan inferred from seismic tomography

Content Provider	Springer Nature Link
Author	Cheng, Win Bin Lin, S. S. Wang, T. K. Lee, C. S. Liu, C. S.
Copyright Year	2010
Abstract	This paper presents results of a seismic tomography experiment carried out on the accretionary margin off southwest Taiwan. In the experiment, a seismic air gun survey was recorded on an array of 30 ocean bottom seismometers (OBS) deployed in the study area. The locations of the OBSs were determined to high accuracy by an inversion based on the shot traveltimes. A three-dimensional tomographic inversion was then carried out to determine the velocity structure for the survey area. The inversion indicates a relatively high P wave velocity (Vp) beneath topographic ridges which represent a series of thrust-cored anticlines develop in the accretionary wedge. The bottom-simulating reflectors (BSR) closely follow the seafloor and lies at 325 ± 25 m within the well-constrained region. Mean velocities range from ~1.55 km/s at the seabed to ~1.95 km/s at the BSR. We model Vp using an equation based on a modification of Wood’s equation to estimate the gas hydrate saturation. The hydrate saturation varies from 5% at the top ~200 m below the seafloor to 25% of pore space close to the BSR in the survey area.
Starting Page	77
Ending Page	87
Page Count	11
File Format	PDF
ISSN	00253235
Journal	Marine Geophysical Researches
Volume Number	31
Issue Number	1-2
e-ISSN	15730581
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-06-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gas hydrates Ocean bottom seismograph Bottom simulating reflectors Seismic tomography Offshore Engineering Earth Sciences Geophysics/Geodesy Oceanography
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics Oceanography

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