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（42222607；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: P67
计量
- 文章访问数: 39
- PDF下载量: 10
- 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 Qizhou Islands offshore

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，南部靠近陆架边缘，古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）、峡谷、水道6种灾害要素，依据其数量、规模和分布特征，划分出了3个危险等级（危险性小、危险性中等、危险性大），共12个区块，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 /
- 分布规律 /
- 危险性分区
Abstract: Objective
The Qizhou Islands, located on the east side of Hainan Island, is an area with a high risk of geohazards due to the influence of tectonic processes (e.g., active fault zones and the Hainan mantle plume) and related earthquakes. The southern part of the Qizhou Islands is close to the edge of the continental shelf, with well-developed canyons and ancient channels, which weaken seabed stability and threaten the safety of engineering facilities in the area. Therefore, studying marine geohazards is of great significance for disaster prevention and mitigation in the Qizhou Islands area. However, research on geohazards in the sea area is limited, and the development characteristics of geohazard elements are unclear.
Objective
To clarify the potential risks of marine geohazards in the offshore Qizhou Islands,
Methods
based on 2D seismic data,
Results
this study identified six geohazard elements (volcanoes, faults, shallow gas, mass-transport deposits (MTDs), canyons, and channels) offshore from the Qizhou Islands. According to their quantity, scale, and distribution characteristics, three risk levels (low risk, medium risk, and high risk) were assigned to 12 blocks.
Conclusion
Combined with the geomorphological and tectonic characteristics, suggestions for geohazard prevention and control were proposed for the offshore Qizhou Islands area.
- Qizhou Islands /
- marine geohazards /
- distribution regularities /
- risk zoning

HTML全文

图 1 研究区地理位置和地质背景

Figure 1. Map of the research location and geological setting

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]

Figure 2. Location of seismic lines and distribution of geohazard elements

下载: 全尺寸图片幻灯片

图 3 研究区典型火山、断层、浅层气、MTDs、古水道和峡谷的剖面特征(测线位置见图2a)

a.测线Line1典型火山；b.测线Line2深部断层；c.测线Line3浅部高角度断层；d.测线Line4 “V”字形高角度断层；e.测线Line5浅层气；f.测线Line6 MTDs；g.测线Line4古水道；h.测线Line7峡谷

Figure 3. Seismic characteristic of volcano and faults

下载: 全尺寸图片幻灯片

图 4 研究区浅层气、MTDs、古水道、峡谷剖面特征

a：测线Line5浅层气剖面图；b：测线Line6 MTDs剖面图；c：测线Line4古水道剖面图；d：测线Line7峡谷剖面图

Figure 4. Seismic characteristic of shallow gas, MTDs, ancient channel and canyons

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表

Table 1. Locations and main geohazard elements of risk zoning of geohazards in the Qizhou Islands offshore

区域编号	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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