论文部分内容阅读
海洋工程地质调查发现，在南海北部外陆架和上陆坡海底，有大片滑坡，其水深范围约在１８０—６５０ｍ之间，它们沿着陆架外缘坡折处呈北东—南西方向分布，其具体位置往往与古三角洲前缘的海底陡坎及古海岸线位置密切相关，大量浅层地震、旁侧声纳、底质取样分析和土体力学理论计算表明，本区滑坡主要是由于地形坡度、沉积物特性、土体自身重力、海底底层流速的大小等诱发因素而产生，而且有些滑坡带还具有多期滑动的性质，它们是区内海底很不稳定的地带，是一种重要的地质灾害因素，在海洋工程地质设计和实施时要引起注意。
Marine engineering geological survey found that there are large landslides in the northern South China Sea on the continental shelf and the upper continental slope, and the water depth range is about 180-650m. They are distributed in the direction from north to south along the slope of the outer edge of the shelf. The location is often closely related to the seabed steep ridge and the ancient coastline of the ancient delta front. A large number of shallow earthquakes, lateral sonar, sediment sampling analysis and soil mechanics calculations show that the landslides in this area are mainly due to the topography gradient, The nature of the soil, the gravity of the soil itself and the velocity of the bottom of the submarine. Some landslide belts also have the characteristics of multi-period sliding. They are very unstable seafloor zones in the region and are an important geohazard factor , In marine engineering geological design and implementation should pay attention.