RUI: Earthquake Induced Slumping and Sediment Liquefaction at the Head of Monterey Canyon

1989年10月17日，莫斯·兰丁海洋实验室的建筑物在里氏7.1级洛马·普里埃塔地震中被毁。当时的证据表明，设施下的沙子液化是原因。在进行了一次巡航，在实验室附近获得了侧扫声纳图像和Uniom地震记录后，人们意识到海底的大规模下沉在破坏中发挥了主要作用。一系列的塌陷伤痕和液化沉积物凸起证明了这种塌陷，这表明一大片区域向附近蒙特利峡谷头部的方向移动。该项目将在证据被冬季风暴掩盖之前，研究海底塌陷和相关的液化沉积物叶的证据。船上的一个项目将收集对浅层塌陷区域的重复侧向扫描调查，将之前的侧向扫描调查扩展到包括峡谷的墙壁，并对沉积物叶和凹陷进行采样。潜水员将在浅水中进行直接观测，主要目的是确定对底栖生态的影响，并与季节循环进行比较。

On 17 October 1989 the buildings of Moss Landing Marine Laboratories were destroyed by the magnitude 7.1 Loma Prieta earthquake. Evidence at the time pointed to liquefaction of the sand under the facility as the cause. After a cruise on which side-scan sonar images and Uniboom seismic records were obatined adjacent the site of the labs it was realized that large scale slumping of the seafloor played a major role in the destruction. That slumping is evidenced by a series of slump scars and liquefaction sediment lobes that indicate movement of a large region in the direction of the nearby head of Monterey Canyon. This project will study the evidence of the submarine slumps and associated liquefaction sediment lobes before the evidence is obscured by winter storms. A shipboard program will collect repetitive side-scan surveys of the shallow areas of slumping, extend the previous side-scan survey to include the walls of the canyon, and sample the sediment lobes and slumps. Direct observations will be made in shallow water by divers primarily for the purpose of establishing the effects on benthic ecology and for comparisions with seasonal cycles.