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Abstract

Due to the perniciousness and universality of the submarine landslide, it has been attracting increasing attention in the world as a hot issue. In order to deepen the understanding of the submarine landslide, the classification of categories and the genetic mechanism were discussed by systematically analyzing the domestic and international research results, meanwhile, the trigger mechanisms about the hydraulic forces and gas hydrate dissociation were emphatically analyzesd. It is showed that the classification of categories is getting more and more deepening, detailed and generalized. The formation of submarine landslide is the outcome of internal and external causes, and its genetic mechanism is extremely complicated. The research direction and working emphasis were pointed out: developing in-situ real time monitoring technique; establishing database about submarine landslide and consummating physical and numerical model.

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... Huge reservoirs of natural gas hydrates were discovered in these areas [25][26][27][28]. Much of the previous research on the continental shelf and upper continental slope of this area has paid little attention to the hydrate-related geohazards in these areas [29][30][31][32][33][34][35]. Although research has been done on submarine landslides in areas of natural gas hydrate exploration [32][33][34][35][36][37][38], the focus has been mainly on the spatial distribution and geometric characteristics of the landslides. ...
... Much of the previous research on the continental shelf and upper continental slope of this area has paid little attention to the hydrate-related geohazards in these areas [29][30][31][32][33][34][35]. Although research has been done on submarine landslides in areas of natural gas hydrate exploration [32][33][34][35][36][37][38], the focus has been mainly on the spatial distribution and geometric characteristics of the landslides. Unfortunately, the relationships between the distribution of gas hydrates and the characteristics of submarine landslides, such as their classification, geomorphic features, distribution, and genesis, have not been investigated systematically [36,[39][40][41][42]. ...
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... Although many triggering mechanisms can cause landslides, either solely or concurrently, prodigious landslides are more likely to be trigged by tectonic events and global change [6,[38][39][40][41]. The Storegga slide is attributed to earthquake activity-associated gas hydrate dissociation during postglacial isostatic rebound [42,43]. ...
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With offshore resource exploration moving to the deep water, marine geohazards have been attracting attention from the academic and industry. Research achievements of marine geohazards were reviewed in this paper. We analyzed and discussed typical issues among marine geohazards, including coastal erosion, submarine slope failure, turbidity current and special hazards induced by gas hydrate dissociation, in terms of their definition, distribution, characteristics and case studies. Major international projects on marine geohazards headed by the United States, Europe, Japan and other international organizations are introduced as well. Three marine geohazard survey methods, including geophysical survey, geotechnical exploration and in-situ observation, were summarized with a brief description of each approach, respectively. Especially, the history of marine geohazard researches in China is briefly reviewed, showing the disparity between China and developed countries in the study of marine geohazards narrows gradually. The potential research tendency in future was suggested.
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