南海宣德环礁东南海域地质灾害特征

doi:10.11978/2021046

Journal of Tropical Oceanography ›› 2022, Vol. 41 ›› Issue (2): 103-111.doi: 10.11978/2021046CSTR: 32234.14.2021046

• Marine Geology • Previous Articles Next Articles

Geohazards characteristics in the southeast of Xuande Atoll, Xisha, South China Sea

CHEN Mei^1,^2,^3,⁴(), XIA Zhen^1,², LIU Wentao^1,²(), HE Jian^1,², MA Shengzhong^1,²

1. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
2. Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, Guangzhou 510760, China
3. Academy of South China Sea Geological Science, China Geological Survey, Sanya 572025, China
4. Sanya Institute of South China Sea Geology, Guangzhou Marine Geological Survey, Sanya 572025, China

Received:2021-04-11 Revised:2021-06-18 Online:2022-03-10 Published:2021-06-30
Contact: LIU Wentao E-mail:chenmei@scsio.ac.cn;lwt0516@126.com
Supported by:
Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(GML2019ZD0208);Open Foundation of Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences(OMG2019-09);Geological Survey Project(DD20160146);Geological Survey Project(DD20221725);Geological Survey Project(DD20201118)

Abstract

Abstract:

The Xuande Atoll is one of the most exploited and utilized area in the South China Sea. Offshore geological hazards around the Xuande Atoll are likely to threaten the construction of reef infrastructure projects and human activities. To meet the needs of sustainable development of islands and reefs in the South China Sea, this study aims to explore the types and spatial distribution of geological hazards in the east sea area of the Xuande Atoll based on single-channel seismic profiles collected by the Guangzhou Marine Geological Survey in 2018. The results show that there are three kinds of geological hazards in the study area, including submarine landslides, seabed scarps and faults. Submarine landslides are the main geological hazard factor in the study area with different scales, and seabed scarps and faults are the secondary geological hazards. Seabed scarps can be divided into reef scarps and landslide scarps according to their genetic mechanisms. The reef scarps were formed under the control of sea-level rise during the formation of the reef, and the landslide scarps were caused by submarine landslide. The tectonic environment in the study area is relatively stable, so we infer that the steep topography and canyon erosion are the main controlling factors for the development of geological hazards. These geological hazards have adverse effects on marine engineering construction and pipeline laying. The results of this study provide basic geological services for infrastructure construction, active disaster prevention and sustainable economic development around the Xuande Atoll and its surrounding areas.

Key words: Xuande Atoll, geological hazards, submarine landslides, seabed scarps, faults

CLC Number:

P736.1

CHEN Mei, XIA Zhen, LIU Wentao, HE Jian, MA Shengzhong. Geohazards characteristics in the southeast of Xuande Atoll, Xisha, South China Sea[J].Journal of Tropical Oceanography, 2022, 41(2): 103-111.

Figures/Tables 5

References 26

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Geohazards characteristics in the southeast of Xuande Atoll, Xisha, South China Sea

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