Distribution and Characteristics of Hazardous Geological Features in the Marine Coastal and Offshore Areas of Zhejiang Province, East China Sea

被引:4
|
作者
Qiu Jiandong [1 ,2 ]
Liu Jian [1 ,2 ]
Yue Nana [3 ]
Wang Shuang [1 ]
Mai Duc Dong [4 ]
机构
[1] Qingdao Inst Marine Geol, Minist Nat Resources, Key Lab Marine Environm Geol, Qingdao 266071, Peoples R China
[2] Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
[3] State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China
[4] Vietnam Acad Sci & Technol, Inst Marine Geol & Geophys, Hanoi 100000, Vietnam
基金
中国国家自然科学基金;
关键词
hazardous marine geological features; shallow gas; coastal and offshore areas; East China Sea; SHALLOW GAS; GEOHAZARDS; IDENTIFICATION; SHELF;
D O I
10.1007/s11802-018-3671-y
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
y Newly acquired high-resolution shallow seismic profiles (7069 km in length) in the coastal and offshore areas of Zhejiang Province, East China Sea, China, have revealed eight marine hazardous geological features: shallow gas, sand ridges, erosion ditches, scarps, irregular bedrock features, underwater shoals, buried paleo-channels, and submarine deltas. Based on the seismic profiles, we have constructed a marine geological map of these hazardous features. Shallow gas accumulations are common and occur mainly in two separate nearshore regions that cover 4613 and 3382 km(2) respectively. There are also scattered shallow gas accumulations in the offshore area, typically accompanied by paleo-channels that occur mainly in the middle of the study area. Sand ridges, erosion ditches, scarps, and irregular bedrock features are found mainly in the northeast of the study area in association with each other. In the southeastern part of the study area, the sand ridges have a linear form and trend NW-SE, representing the western part of the linear sand ridges in the East China Sea. The maximum slope gradient is 1 degrees, which suggests that this area is prone to landslides. These hazardous marine geological features are important to marine and engineering activities in this region.
引用
收藏
页码:1318 / 1324
页数:7
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