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Discovery of Submarine Landslide Evidence Due to the 2009 Suruga Bay Earthquake

机译：2009年Suruga湾地震发现海底滑坡证据

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On August 11, 2009, at 05:07 JST, a moderate-to-large earthquake took place in the Suruga Bay of central Japan. It struck two deep-sea water pipes in the source area. Immediately after the event, both the temperature and the turbidity of the waters increased significantly. Surveys carried out in the source area revealed the level of damage to the water pipes. In this study, we report on the results of the visual survey performed by the remotely operated vehicle Hyper-Dolphin and the bathymetric data collected by the research vessel Natsushima. We found that one water pipe was moved at least 2 km downstream from its original location. The bathymetries obtained before and after the earthquake identified two types of geomorphologic features related to submarine landslide in the approximately 20 km~2 region. One of the features consists of extensive deepening and shallowing patterns newly created in the source area, suggesting mass slide traces processed during the earthquake. The other feature consists of a slide scar, slide blocks, and slope failures created locally in the upstream direction of the water pipe. This latter feature is evidence that mass slide took place and eventually moved the water pipe during the Suruga Bay earthquake.
机译：2009年8月11日日本标准时间05:07，日本中部的骏河湾发生了中到大地震。它撞到了源区的两条深海水管。事件发生后，水域的温度和浊度均立即显着升高。在水源地区进行的调查显示出对水管的损坏程度。在这项研究中，我们报告了由遥控船Hyper-Dolphin进行的视觉调查结果以及由研究船Natsushima收集的测深数据。我们发现一根水管从其原始位置向下游移动了至少2公里。地震前后的水深确定了与海底滑坡有关的两种地貌特征，大约在20 km〜2区域。特征之一包括在震源区新近形成的广泛的加深和变浅模式，这表明在地震过程中已处理了大量的滑动轨迹。另一个特征包括在水管上游方向局部产生的滑痕，滑块和斜坡破坏。后一个特征是在Suruga湾地震期间发生了大规模滑动并最终移动了水管的证据。

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