Distribution and genesis of submarine landslides in the northeastern South China Sea,Geological Journal

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Distribution and genesis of submarine landslides in the northeastern South China Sea
Geological Journal ( IF 1.4 ) Pub Date : 2020-09-23 , DOI: 10.1002/gj.3996
Kun Zhang ₁ , Haibin Song ₁ , Shaoqin Sun ₁ , Jinyao Gao ₂

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Submarine landslide is a widespread marine geohazard and an important part of the global ‘source to sink’ system. In this article, multi‐channel seismic and topographic data are utilized to investigate the distribution, calculate the geomorphologic parameters, and discuss the genesis of the submarine landslides in the northeastern South China Sea. In the study area, which can be divided into two tectonic provinces: passive continental margin province and accretionary wedge province, 101 landslides are identified, with a total size of 2,358.22 km². Statistics show that most landslides are of small sizes (<15 km²) and developed along small slope gradient regions. There is a high correlation between the slope gradient and the ratio of headscarp height to runout distance. The size and runout distance of landslide also correlate well. However, there is a low correlation coefficient including slope gradient versus runout distance and slope gradient versus size. The distribution of submarine landslides is consistent with that of bottom simulating reflections (BSRs) and seabed activities, which may imply a possible inner correlation among them. The calculated base of gas hydrate stability zone (BGHSZ) pinches out the seafloor at about 555–556 m below the sea level, where most of the landslide headscarps are located. And the BGHSZ depths are often shallower than the BSRs bottom depths in the upper slope area. Combined with previous studies, we consider that the influence factors of submarine landslides in the study area are earthquakes, canyons, seabed fluid activities, and gas hydrate dissociation. Gas hydrate dissociation is a global influence factor in the study area. In the passive continental margin province, the submarine landslides are mainly canyon‐associated landslides. While in the accretionary wedge province, they are mainly controlled by seabed fluid activities and earthquakes.

中文翻译：

南海东北部海底滑坡的分布与成因

海底滑坡是一种广泛的海洋地质灾害，是全球“源下沉”系统的重要组成部分。本文利用多通道地震和地形数据来调查分布，计算地貌参数，并讨论南海东北部海底滑坡的成因。在研究区域中，可分为两个构造省份：被动大陆边缘省份和增生楔形省份，确定了101个滑坡，总大小为2358.22 km ²。统计数据显示，大多数滑坡是小规模的（<15 km ²），并沿小坡度梯度区域发展。坡度与of实高度与跳动距离之比之间具有高度相关性。滑坡的大小和跳动距离也有很好的相关性。但是，相关系数很低，包括坡度梯度与跳动距离以及坡度梯度与大小。海底滑坡的分布与海底模拟反射（BSR）和海床活动的分布一致，这可能暗示它们之间可能存在内在联系。计算出来的天然气水合物稳定区（BGHSZ）的底部夹在海平面以下555-556 m处，这是大多数滑坡头皮所处的位置。在上坡区，BGHSZ深度通常比BSRs的底部深度浅。结合以前的研究，我们认为研究区域内海底滑坡的影响因素是地震，峡谷，海底流体活动和天然气水合物分解。天然气水合物的解离是研究领域中的一个全球性影响因素。在被动大陆边缘省，海底滑坡主要是与峡谷相关的滑坡。在增生楔形省中，它们主要受海底流体活动和地震的控制。

更新日期：2020-09-23

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