Imaging a hydrate-related cold vent offshore Vancouver Island from deep-towed multichannel seismic data
Imaging a hydrate-related cold vent offshore Vancouver Island from deep-towed multichannel seismic data
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DOI：
10.1190/1.3072620
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发表时间：
2009-02
期刊：
影响因子：
3.3
通讯作者：
T. He;G. Spence;W. Wood;M. Riedel;R. Hyndman
中科院分区：
文献类型：
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作者：
T. He;G. Spence;W. Wood;M. Riedel;R. Hyndman
Bullseye喷口是位于温哥华岛近海中坡的一个直径约为500米的深海水合物相关冷喷口，通过深拖声学和地球物理系统（DTAGS）进行的高分辨率多通道测量对该喷口进行了成像。该结构由综合大洋钻探计划在U1328站点进行钻探。高频（220-820 Hz）DTAGS系统在海底上方约300米处拖曳，提供高垂直和横向分辨率图像。利用DTAGS数据成像的主要问题是震源深度和接收器位置的非线性变化。高频、短波长数据需要非常精确地定位源和接收器，以便进行叠加和速度分析。新的程序开发的最佳处理，包括接收电缆的几何形状估计从节点的深度，直接到达和海面反射，使用遗传算法反演方法，和声学图像拼接的基础上，通过互相关的冗余数据之间的相对源定位…
The Bullseye vent, an approximately 500-m -diameter deep-sea, hydrate-related cold vent on the midslope offshore Vancouver Island, was imaged in a high-resolution multichannel survey by the Deep-towed Acoustics and Geophysics System (DTAGS) The structure was drilled by the Integrated Ocean Drilling Program at site U1328. Towed about 300 m above the seafloor, the high-frequency (220–820 Hz) DTAGS system provides a high vertical and lateral resolution image. The major problems in imaging with DTAGS data are nonlinear variations of the source depths and receiver locations. The high-frequency, short-wavelength data require very accurate positioning of source and receivers for stacking and velocity analyses. New routines were developed for optimal processing, including receiver cable geometry estimation from node depths, direct arrivals and sea-surface reflections using a genetic algorithm inversion method, and acoustic image stitching based on relative source positioning bycrosscorrelating redundant data betw...