中国海域灾害地质区划初步探讨

基于对现有调查研究成果资料的分析和认识,本文探讨了海洋灾害地质区划的原则,首次提出了我国全海域的海洋灾害地质区划方案,按大型构造地貌界线作为一级灾害地质分区,划分为海岸带、陆架、陆坡(岛坡)、海盆与海槽4个灾害地质区,然后根据地理位置及灾害地质环境特征划分出24个灾害地质亚区。此外,从灾害致灾因子和孕灾环境角度出发,定性的将中国海域的地质灾害风险(危险性)划分为4级,在24个灾害地质亚区中,较高风险区11个,约占近总数的一半;其次是较低风险区7个,占近三分之一;高风险区、低风险区分别仅4个、2个。

A preliminary study for hazard geology divisions in China Sea areas

Based on the results of existing research data analysis and understanding,this article explores division principles of marine hazard geology and it is the first time for hazard geology divisions of whole China Sea areas.According to the boundaries of large tectonic geomorphology it can be divided into 4 hazard geology regions,i.e.coastal,continental shelf,continental slope,basin and trough hazard geology regions.According to geographical location and hazard geology environmental features it can be divided into 24 hazard geology sub-regions.In addition,based on the hazard factor and disaster pregnant environment the geological hazard risk level in China Waters is qualitatively divided into 4.In 24 hazard geology sub-regions which accounted for 11 higher risk,about nearly half of the total,followed by 7 lower risk,nearly one-third of the total,and high-risk and low-risk sub-regions were only 4 and 2 respectively.