M74/3 raw data of EM710 multibeam echosounder (bathymetry, beam time series & amplitudes)

Between 30.10.2007 and 28.11.2007, bathymetric data was acquired on the continental margin of Pakistan in the Makran subduction zone during R/V METEOR cruise M74/3. This expedition builds on the findings of the previous cruise M74/2, which was dedicated to a systematic seep search in the working area, where several bubble flares, backscatter anomalies and distinct seismic records were detected by using sidescan sonar, multi-channel seismics and a sediment echosounder. These findings provided the basis for detailed surveying during the cruise M74/3. The multibeam echosounders (MBES) KONGSBERG SIMRAD EM120 and EM710 were utilized for extensive mapping of the working area, which is essential for most investigations. Furthermore, bathymetric mapping during M74/3 significantly increased the resolution of previous bathymetry grids and provided information for the deployment of the remotely operated vehicle (ROV) MARUM-QUEST. The ROV was utilized to map the seafloor, take samples at potential seep sites and deploy and recover autonomous tools, such as a bubble-meter and in-situ pore water sampler. […]

2007年10月30日至2007年11月28日期间，科研考察船METEOR号（R/V METEOR）在马克兰俯冲带（Makran subduction zone）的巴基斯坦大陆边缘执行M74/3航次，采集了水深测量数据。本次航次依托此前M74/2航次的研究成果展开：M74/2航次的核心任务是在所辖作业区内开展系统性冷渗漏点（seep）普查，期间通过侧扫声呐、多道地震勘探设备与沉积回声测深仪，探测到多处气泡羽流（bubble flares）、反向散射异常区与特征显著的地震记录。这些发现为M74/3航次的精细化勘测提供了核心依据。本航次搭载了KONGSBERG SIMRAD EM120与EM710型多波束回声测深仪（multibeam echosounders, MBES），对作业区开展全覆盖测绘，该工作是绝大多数相关研究的必要基础。此外，M74/3航次的水深测绘工作显著提升了原有水深网格的空间分辨率，并为远程遥控潜水器（remotely operated vehicle, ROV）MARUM-QUEST的布放作业提供了关键数据支撑。该远程遥控潜水器被用于海底地形测绘、潜在渗漏点采样，以及部署与回收气泡测量仪、原位孔隙水采样器等自主式作业工具。[…]