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：该项目需要对2005年法国赞助的Sismomar Cruise期间从幸运的罢工火山，大西洋山脊获得的3D多通道地震数据集进行重新分析，以及来自同一地区的大型海洋底部震荡实验的数据。由法国领导的小组对这些数据的原始分析显示了大西洋中部山脊下方广泛的岩浆镜头的明确证据。为了查看更精细的结构，特别是为了区分岩浆体的融化且富含晶体的部分（对海洋地球科学社区非常重要的问题），PIS打算采用Prestack成像方法，需要详细了解浅层结构的知识。为实现这一目标而提出的方法（合成海洋底部实验）应使多通道地震数据的高分辨率断层扫描。这是一种波动方程解决方案，可将源和接收器推到海底，并能够检测到MCS流媒体上记录的最浅的折射到达，否则这些避雷器被隐藏在水波中。 SOBE应在10米的范围内提供垂直分辨率，以提供Prestack成像所需的结构控制，还应使可能将富含熔体的区域连接到水热通道场的上层地壳流体途径和断裂。如果可以通过对该现有数据集的分析来证明SOBE方法，则它有可能改变海洋多通道地震研究。更广泛的影响：更广泛的影响包括用于MCS数据分析和解释的能力构建，以及通过Ridgeview网站进行公众观看的可视化产品的分布，以及在Paine论坛上的高清立体声投影剧院。该项目包括研究和培训经验，为研究生和法国机构之间提供资金。