七洲列岛海域海洋地质灾害要素、类型及危险性分区

张林; 望畅; 沈奥; 李思泓; 孙启良

doi:10.19509/j.cnki.dzkq.tb20240395

七洲列岛海域海洋地质灾害要素、类型及危险性分区

doi: 10.19509/j.cnki.dzkq.tb20240395

张林^1,,
望畅^2, ,,
沈奥²,
李思泓²,
孙启良²

1.
中国地质调查局海口海洋地质调查中心，海口 570100
2.
中国地质大学（武汉）海洋地质资源湖北省重点实验室，武汉 430074

基金项目: 国家自然科学基金（42176085；42222607）；中国地质调查局科研项目（CD-1685991709604）

详细信息

作者简介:
张林：E-mail：zlin_a@mail.cgs.gov.cn

通讯作者:
E-mail：wangchang1997@cug.edu.cn

中图分类号: P736
计量
- 文章访问数: 94
- PDF下载量: 29
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-15
- 录用日期: 2024-11-21
- 修回日期: 2024-11-11
- 网络出版日期: 2025-12-15

Elements, types, and risk zoning of marine geohazards in the sea area of the Qizhou Islands

1.
Haikou Marine Geological Survey Center, China Geological Survey, Haikou 570100, China
2.
Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences(Wuhan), Wuhan 430074, China

More Information

Author Bio:
E-mail：zlin_a@mail.cgs.gov.cn

Corresponding author: E-mail：wangchang1997@cug.edu.cn

摘要

摘要:
七洲列岛海域受活动断裂带、海南地幔柱等构造作用影响地震频发，南部靠近陆架坡折带，水道和峡谷较为发育，易发生海底失稳，威胁该区域工程设施的安全。目前对该海域的地质灾害研究较少，灾害要素的发育特征尚不明确。利用二维地震资料，识别出了火山、断层、浅层气、块状搬运沉积体系（MTDs）、水道、峡谷6种灾害要素，依据其数量、规模和分布特征，划分出了危险性小、危险性中等、危险性大3个危险等级，共12个灾害危险性分区区块，结合不同区域的地形地貌和构造活动特征，对该海域海洋地质灾害防治提出了参考建议。研究成果对七洲列岛海域海洋地质灾害的防灾减灾工作具有重要意义。
- 七洲列岛 /
- 海洋地质灾害 /
- 地质灾害要素 /
- 分布规律 /
- 危险性分区
Abstract: Objective
The sea area of the Qizhou Islands, located to the east of Hainan Island, is prone to frequent earthquakes due to the tectonic processes including active fault zones and the Hainan mantle plume. The southern part of the Qizhou Islands is close to the continental shelf break, with well-developed canyons and channels, making it prone to seabed instability and threatening the safety of engineering facilities in this area. However, research on marine geohazards in this sea area is scarce, and the development characteristics of geohazard elements remain unclear. Therefore, it is of great significance to conduct an in-depth study on marine geohazards for disaster prevention and mitigation in this area.
Methods
In this study, 2D seismic data were used to clarify the potential risks of marine geohazards in the sea area of Qizhou Islands.
Results
Six geohazard elements were identified in the sea area of the Qizhou Islands: Volcanoes, faults, shallow gas, mass transport deposits (MTDs), channels, and canyons. According to their quantity, scale, and distribution characteristics, the study area was divided into 12 blocks with three risk levels (low, medium and high risk). Based on the topographic, geomorphological, and tectonic activity characteristics of different blocks, targeted recommendations for the prevention and control of marine geohazards in the sea area of the Qizhou Islands are proposed.
Conclusion
The research results provide a scientific basis for disaster prevention and mitigation as well as the construction of marine engineering facilities in the sea area of the Qizhou Islands.
- Qizhou Islands /
- marine geohazard /
- geohazard element /
- distribution pattern /
- risk zoning

HTML全文

图 1 研究区地理位置和地质背景

Figure 1. Location and geological setting of the study area

下载: 全尺寸图片幻灯片

图 2 研究区测线位置(a)和地质灾害要素分布(b)

边缘为虚线的滑坡和水道参考文献[3]；潮流沙脊参考文献[20]；下同

Figure 2. Location of seismic lines (a) and distribution of geohazard elements (b) in the study area

下载: 全尺寸图片幻灯片

图 3 研究区典型火山、断层、浅层气、块体搬运沉积体系（MTDs）、水道和峡谷的剖面特征（测线位置见图2a）

a. 测线Line 1，典型火山；b. 测线Line 2，深部断层；c. 测线Line 3，浅部倾向相同高角度断层；d. 测线Line 4，浅部“V”字形高角度正断层；e. 测线Line 5，浅层气；f. 测线Line 6，MTDs；g. 测线Line 4，水道；h. 测线Line 7，峡谷

Figure 3. Profile characteristics of typical volcanoes, faults, shallow gas, MTDs, channels, and canyons in the study area

下载: 全尺寸图片幻灯片

图 4 七洲列岛海域海洋地质灾害危险性分区（A～L为区块编号）

Figure 4. Risk zoning of marine geohazards in the sea area of the Qizhou Islands

下载: 全尺寸图片幻灯片

表 1 七洲列岛周缘海洋地质灾害风险区域划分

Table 1. Risk zoning of marine geohazards in the sea area surrounding the Qizhou Islands

区块编号	东经/(°)	北纬/(°)	主要灾害类型	灾害危险性
A	110.94～111.45	20.43 ～20.96	滑坡	中等
B	110.95～111.31	19.99 ～ 20.21	滑坡	中等
C	110.96～111.68	19.81 ～ 20.40	海底火山	中等
D	111.26～112.57	19.27 ～ 19.98	水道浊流	中等
E	110.75～111.67	18.46 ～ 19.19	水道浊流、滑坡、浅层气	中等
F	112.35～112.69	19.61 ～ 19.78	滑坡、浅层气	中等
G	111.80～112.36	20.41 ～ 21.01	滑坡、浅层气	小
H	112.38～112.76	18.82 ～ 19.17	浅层气	小
I	111.27～111.59	19.03 ～ 19.23	浅层气	小
J	111.81～112.33	18.79 ～ 19.41	水道浊流、滑坡、浅层气	大
K	112.28～113.15	19.11 ～ 19.69	水道浊流、滑坡	大
L	111.34～113.47	18.39 ～ 19.37	峡谷浊流、滑坡	大

下载: 导出CSV

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