Identification of Fault Activity in Urban Active Fault Exploration and Seismic Risk Assessment in Zhenjiang City
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摘要: 镇江市是江苏省破坏性地震发生较多的地区。对镇江市主要发震断层开展活动性探测及地震危险性评价工作，查明其发震能力，对于镇江市防震减灾事业发展具有重要意义。对镇江市区威胁较大的主要隐伏断层有4条，分别为幕府山-焦山断裂、五峰山-西来桥断裂、丹徒-建山断裂、汝山-上会断裂。通过开展浅层人工地震勘探、钻孔联合地质剖面探测、野外地震地质调查等相关工作，评价4条断裂的活动历史、活动性质、规模、展布及最新活动时代。研究结果表明，幕府山-焦山断裂最新活动时代为中更新世晚期，丹徒-建山断裂最新活动时代为早更新世至中更新世早期，五峰山-西来桥断裂最新活动时代为中更新世，汝山-上会断裂为前第四纪断裂。幕府山-焦山断裂和五峰山-西来桥断裂是目标区具备一定发震能力、地震危险性较大的2条断裂；判断五峰山-西来桥断裂潜在地震的最大震级为6.0级，幕府山-焦山断裂潜在地震的最大震级为6.5级。Abstract: Zhenjiang city is an area where destructive earthquakes occur more frequently in Jiangsu. Identification of fault activity and seismic risk assessment to the main seismogenic faults of Zhenjiang city is of great significance to earthquake disaster prevention and reduction in Zhenjiang. The previous studies suggested that there exist four buried faults which have greater threat to Zhenjiang: Mufushan-Jiaoshan fault; Wufengshan-Xilaiqiao fault; Dantu-Jianshan fault; Rushan-Shanghui fault. Based on shallow artificial seismic exploration, drilling joint profiling work and field geological survey in the project of “Urban active fault exploration and seismic risk assessment in Zhenjiang city”, the active history and characteristics, the distribution and the latest activities era of these faults are analysed. The results show that the latest activities era of Mufushan-Jiaoshan fault is Medium term of Middle Pleistocene, the latest activities era of Wufengshan-Xilaiqiao fault is Middle Pleistocene, the latest activities era of Dantu-Jianshan fault is early-middle Pleistocene, and which of Rushan-Shanghui fault is pre-Quaternary. The Mufushan-Jiaoshan and Wufengshan-Xilaiqiao fault are two faults which have certain degree of seismogenic capability and greater seismic risk in the target zone. We judged the maximum potential earthquake of Mufushan-Jiaoshan fault is M6.5, and the maximum potential earthquake of Wufengshan-Xilaiqiao fault is M6.0.
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图 1 镇江市活动断层探测项目主要断层位置示意图
Figure 1. Schematic diagram of the main fault location of “Urban active fault exploration project of Zhenjiang city”
图 2 幕府山-焦山断裂浅层地震剖面（局部）
Figure 2. Part of the seismic exploration profile of Mufushan-Jiaoshan fault
图 3 桥头村场地钻孔联合地质剖面
Figure 3. The drilling joint profile in the Qiaotou site of Zhenjiang
图 4 五峰山-西来桥断裂浅层地震剖面（局部）
Figure 4. Part of the seismic exploration profile of Wufengshan-Xilaiqiao fault
图 5 大路镇场地钻孔联合地质剖面（下部）
Figure 5. The drilling joint profile in the Dalu site of Zhenjiang （Lower part）
图 6 丹徒-建山断裂浅层地震剖面（局部）
Figure 6. Part of the seismic exploration profile of Dantu-Jianshan fault
图 7 访仙镇场地钻孔联合地质剖面
Figure 7. The drilling joint profile in the Fangxian site of Zhenjiang
图 8 汝山-上会断裂浅层地震剖面（局部）
Figure 8. Part of the seismic exploration profile of Dantu-Jianshan fault
图 9 长香东场地钻孔联合地质剖面
Figure 9. The drilling joint profile in the Changxiangdong site of Zhenjiang
表 1 目标区主要断裂特征
Table 1. List of parameters of faults in the target zone
编号 断裂名称 产状 长度/km 性质 最新活动时代 相关地震 走向 倾向 倾角/（°） F1 五峰山-西来桥断裂 NNW E 55～60 34 左行张扭 ${\rm{Q}}_{\rm{p}}^2 $ 999年常州5½级地震 F2 丹徒-建山断裂 NW SW 50～55 40 左行张扭 ${\rm{Q}}_{\rm{p}}^{1-2} $ 1913年镇江5.5级地震 F3 幕府山-焦山断裂 近EW S/N 较陡 75 正断 ${\rm{Q}}_{\rm{p}}^2 $晚期 1624年扬州6级地震、1930年镇江5.5级地震、
1872年镇江4¾级地震F4 汝山-上会断裂 NE E 60～80 24 正断/逆断 前第四纪 — 
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