3深圳市活断层探测与地震危险性评价(第三篇).docVIP

深圳市活断层探测与地震危险性评价 徐俊 余成华1张桂香1汤德刚1肖兵1蒋鹏1 陈庞龙2 (1. 深圳市勘察研究院有限公司 广东 深圳 510086 2. 广东省地震局 广东 广州 510070) 摘要：在前人的研究成果为基础上，通过对深圳市目标断层地表出露段开展野外地震地质调查，对隐伏段进行浅层地震反射探测、跨断层钻孔探测、槽探、电磁波CT探测，查明了目标断层的空间位置，确定了其第四纪活动性，作出了目标区主要断层分布图。此外，通过区域构造背景分析确定了目标断层地震强度的总体水平，给出最大震级上限，运用入倉—三宅经验关系和构造类比方法分别估计了断层的最大震级，并对目标断层进行危险性综合评价，作出了断层危险性评价图。 关键词：活断层；浅层地震；构造类比；地震危险性评价 Active Fault Exploration and Seismic Hazard Assessment in Shenzhen City Xu jun(1) Yu Chenghua(1) Zhang Guixiang(1) Tang Degang(1) Xiao Bing(1) Jiang Peng(1) Chen Panglong(2) 1. Shenzhen Investigation Research Institute CO.LTD，Shen zhen 510086，China; 2. Seismological Bureau of Guangdong， GuangzhouAbstract：Based on the Previous research results, through the field seismic geology survey on the surface outcrop section of the target faults, and shallow seismic reflection exploration、drilling exploration crossing faults、trenching, and electromagnetic wave CT exploration of concealed faults，the spatial position and the Quaternary activity of target faults in Shenzhen City are identified, the distribution map of main faults in target zone is drafted. In addition, based on the regional tectonic background, the target faults’ overall level of earthquake intensity is analyzed, and upper limit magnitude of the faults is educed, Then, the maximum magnitude of earthquakes in Shenzhen is evaluated with the Warehousing – Miyake empirical relationship and the tectonics analogy method. Finally, the seismic hazard of the target faults in Shenzhen is assessed comprehensively according to the methods above-mentioned. the risk evaluation map of target faults is drafted in this paper. Key words：Active fault; shallow seismic exploration；tectonic analogy method；Seismic hazard assessment 1 1.1 目标区的确定 活断层探测[1]目标区以包括或涉及探测城市的区域地震构造单元为原则，根据深圳市实测和推测的主要断裂分布、规模以及对深圳市规划建设的影响程度，结合深圳市现有城区、经济开发区、远景规划区范围，确定为以城区为中心，面积为38×20km2的方形区域,面积760km2,地理坐标为:北纬22(30(00(～22(41(40(，东经113(58(00(～114(20(00(。 1.2 目标断层的确定 目标断层的选择以经过城区、具一定规模、有一定工作基础、已知第四纪有活动的主要断层为原则，在此基础上根据经费和技术力量等