Characteristics and distribution of geohazards since the middle miocene of the Xisha sea area, South China Sea

Geological hazards can cause significant harm to the construction and maintenance of reef infrastructure projects in Xisha Sea area. This study uses high-resolution multichannel earthquake data, single-channel seismic profiles, multi-beam survey data identify analyze geological area since Miocene. Based on geophysical interpretation, destructive disaster factors that are active, such as active faults, shallow gas, diapers, landslides, multistage scarps (steps), scouring troughs, canyons, well restrictive without activity ability, buried paleochannels, pockmarks, reefs, undersea volcanoes, identified analyzed. paper discusses causes and, for first time, draws a comprehensive plane layout hazards. The above analysis demonstrates mainly located around atolls or platforms, slope southeast seabed topography is significantly higher than northwest. There seven medium large Yongxing Plateau Yongle Plateau, caused by gravity faulting. Shallow gas developed southern part North Reef indicated diaper structures, chimneys. A series faults area, steep normal faults. troughs primarily distributed near Platform, Zhongjian Huaguang Platform. Submarine canyons northern parts Shidao Affected multiple hydrodynamic conditions, stability sedimentary layers, sediment supply, scour degree varies, with general depth ranging from several meters hundred meters. Underwater should not be constructed areas results this serve guide further exploration prevention mitigation during