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3-D TRAVEL TIME TOMOGRAPHY INVERSION FOR GAS HYDRATE DISTRIBUTION FROM OCEAN BOTTOM SEISMOMETER DATA

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Title: 3-D TRAVEL TIME TOMOGRAPHY INVERSION FOR GAS HYDRATE DISTRIBUTION FROM OCEAN BOTTOM SEISMOMETER DATA
Author: Zykov, Mykhail M.; Chapman, N. Ross; Spence, G.D.
Subject Keywords gas hydrates;ocean bottom seismometers;cold vent;seismic tomography;ICGH 2008;International Conference on Gas Hydrates 2008
Issue Date: 2008-07
Publicly Available in cIRcle 2008-08-15
Citation: Zykov, Mykhail M.; Chapman, N. Ross; Spence, G.D. 2008. 3-D TRAVEL TIME TOMOGRAPHY INVERSION FOR GAS HYDRATE DISTRIBUTION FROM OCEAN BOTTOM SEISMOMETER DATA. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
Abstract: This paper presents results of a seismic tomography experiment carried out at the Bullseye cold vent site offshore Vancouver Island. In the experiment, a seismic air gun survey was recorded on an array of five ocean bottom seismometers (OBS) deployed around the vent. The locations of the shots and the OBSs were determined to high accuracy by an inversion based on the shot travel times. A three-dimensional tomographic inversion was then carried out to determine the velocity structure around the vent, using the localized source and receiver positions. The inversion indicates a relatively uniform velocity field around and inside the vent. The velocities are close to the values expected for sediments containing no hydrate, which supports previous claims that the bulk concentrations of gas hydrates are low at the site. However, the largest resolved velocity anomalies of + 25 m/s are spatially within the limits of the acoustic blank zone seen in multichannel seismic data near the Bullseye vent. The velocity inversion is consistent with zones of high concentration (15-20 % of the pore space) in the top 50-100 m of sediment.
Affiliation: Other
URI: http://hdl.handle.net/2429/1381
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