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ZHANG Lin,WANG Chang,SHEN Ao,et al. Elements, types, and risk zoning of marine geohazards in the Qizhou Islands offshore[J]. Bulletin of Geological Science and Technology,2026,45(2):1-9 doi: 10.19509/j.cnki.dzkq.tb20240395
Citation: ZHANG Lin,WANG Chang,SHEN Ao,et al. Elements, types, and risk zoning of marine geohazards in the Qizhou Islands offshore[J]. Bulletin of Geological Science and Technology,2026,45(2):1-9 doi: 10.19509/j.cnki.dzkq.tb20240395

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

doi: 10.19509/j.cnki.dzkq.tb20240395
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  • 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.

     

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