Coll. Res: Advanced MCS processing of the SISMOMAR 3D data volume: Exploring linkages within the magmatically driven hydrothermal system of the Lucky Strike Volcano (MAR, 37deg N)

科尔。

• 批准号: 0825018
• 负责人: Juan Pablo Canales
• 金额: $ 11.03万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0825018&HistoricalAwards=false
• 关键词: Coll.; Res; Advanced; MCS; processing

Intellectual Merit: The project entails a re-analysis of a 3-d multichannel seismic data set obtained from the Lucky Strike volcano, Mid-Atlantic Ridge during the French-sponsored SISMOMAR cruise in 2005, and data from a larger-scale ocean bottom seismic tomographic experiment in the same region. The original analysis of these data by a French-led group shows clear evidence for an extensive magma lens beneath the Mid-Atlantic Ridge. In order to look at finer-scale structure, and particularly to distinguish between melt-rich vs crystal-laden sections of the magma body (a question of great importance to the marine geoscience community), the PIs intend to employ a prestack imaging approach which requires detailed knowledge of shallow crustal structure. The method proposed to achieve this, SOBE (synthetic ocean bottom experiment) should enable high resolution tomography of multichannel seismic data. This is a wave equation solution that extrapolates sources and receivers to the seafloor and enables detection of the shallowest refracted arrivals recorded on the MCS streamer that otherwise are hidden in the water waves. SOBE should provide vertical resolution on the order of 10s of meters to provide the structural controls required for prestack imaging, and should also make it possible to highlight the upper crustal fluid pathways and fractures that may be linking melt-rich zones to the hydrothermal vent fields. If the SOBE method can be proven through the analysis of this existing data set, it has the potential to transform marine multichannel seismic investigations. Broader Impacts: Broader impacts include capacity building for MCS data analysis and interpretation, and distribution of visualization products for public viewing through the RidgeView website, and at an HD stereo projection theatre at the Paine Forum. The project includes research and training experiences for a graduate student to be split funded between US and French institutions.

智力优点：该项目需要重新分析 2005 年法国赞助的 SISMOMAR 巡航期间从大西洋中脊 Lucky Strike 火山获得的 3D 多道地震数据集，以及来自更大规模海底地震的数据同一区域的断层摄影实验。一个法国领导的小组对这些数据的原始分析显示了明确的证据，表明大西洋中脊下方存在广泛的岩浆透镜体。为了观察更精细的结构，特别是为了区分岩浆体的富含熔体和富含晶体的部分（这对海洋地球科学界来说非常重要），PI 打算采用叠前成像方法，该方法需要对浅层地壳结构的详细了解。为实现这一目标而提出的方法 SOBE（合成海底实验）应能够实现多道地震数据的高分辨率层析成像。这是一种波动方程解，可将源和接收器外推至海底，并能够检测 MCS 拖缆上记录的最浅折射到达，否则这些折射到达将隐藏在水波中。 SOBE 应提供数十米量级的垂直分辨率，以提供叠前成像所需的结构控制，并且还应能够突出显示可能将富熔体区域与热液喷口场连接起来的上地壳流体通道和裂缝。如果 SOBE 方法可以通过现有数据集的分析得到证实，那么它就有可能改变海洋多道地震调查。更广泛的影响：更广泛的影响包括 MCS 数据分析和解释的能力建设，以及通过 RidgeView 网站和 Paine Forum 的高清立体投影剧院分发可视化产品供公众观看。该项目包括研究生的研究和培训经验，由美国和法国机构分别资助。