Swath-seismic mapping of European continental margins

我们建议开发“条带地震仪”，使用9个平行的9通道拖缆作为天线，绘制大陆边缘的地下地质图。由于每个条带的宽度约为水深的两倍，该方法可以覆盖的区域比用二维地震测线网格或多拖缆近垂直地震法进行的常规测绘快几个数量级。目标包括倾斜的断层块，蛇纹岩脊，熔岩流的顶部，巨大的直布罗陀渐消层的顶部和底部模拟反射器。BSR是天然气水合物底部的伴生气。该方法还应该能够成像和绘制底辟和泥火山领域。该方法的多功能性使其在欧洲大陆边及其共轭物中具有广泛和多样的应用。绘制基底结构图对于研究非火山大陆边和火山大陆边的裂谷过程特别重要。绘制海底SR和泥火山及其他渗漏和喷口的地图，对于研究边缘的流体流动状况及其与热状况、斜坡稳定性、新构造运动和天然气水合物的联系至关重要。因此，该提案与欧洲边缘国家信息系统征集提案的所有三个主题都相关。

We propose the development of "swath-seismics" using 9 parallel 9-channel streamers as an antenna to map out sub-surface geology at continental margins. As the width of each swath is approximately twice the water depth, the method can cover areas, several orders of magnitude more quickly than conventional mapping with grids of 2-D seismic lines or multistreamer near-vertical seismics. Targets include tilted fault blocks, serpentinite ridges, the tops of lava flows, the top of the giant Gibraltar Olistostrome and the Bottom Simulating Reflector. The BSR is associated gas, which occurs at the base of gas hydrates. The method should also be able to image and map fields of diapirs and mud volcanoes. The versatility of the method gives it widerspread and diverse application to European continental margins and their conjugates. Mapping of basement structure is particulary relevant for studies of rifting processes at both non-volcanic and volcanic continental margins. Mapping of BSRs and of mud volcanoes and other seeps and vents are essential for studying the fluid flow regime of the margin, and its linkages with the thermal regime, slope stability, neotectonics and gas hydrates. The proposal, thus, has relevance for all three main themes of the EUROMARGINS call for proposals.