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

1989年10月17日，莫斯兰丁的建筑物 海洋实验室被7.1级洛马摧毁 普列塔地震。 当时的证据表明 设施下的沙子液化是原因。 经过一次巡航，侧扫声纳图像和Uniboom 地震记录是在实验室附近获得的， 人们意识到海底的大规模塌陷 破坏中的主要作用。 一系列的经济衰退证明了这一点 疤痕和液化沉积物的裂片表明了 蒙特雷附近的一大片地区 峡谷。 这个项目将研究潜艇的证据 滑塌和相关的液化沉积物叶 证据被冬季的风暴所掩盖。 一个船上程序 将收集浅水区的重复侧扫测量数据 的滑塌，扩大以前的侧扫描调查，包括 峡谷的壁，并对沉积物裂片进行取样， 衰退 直接观测将在浅水区进行， 潜水员主要是为了确定对 底栖生态学和与季节循环的比较。

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.