江苏新沂高新区钻孔联合剖面揭示的郯庐断裂带F5几何结构特征OACSTPCD
Geometric Structural Features of the F5 in Tanlu Fault Zone Revealed by Drilling Joint Profile in High-Tech District of Xinyi City,Jiangsu Province
郯庐断裂带安丘—莒县断裂(F5)为1668年郯城81/2级地震的发震断裂.该次地震的地表破裂可能已延至新沂市区南侧的南马陵山一带.新沂市活动断层探测结果显示F5断裂以隐伏断裂形式穿经新沂市区,为全新世活动断裂.在此工作基础上,我们对F5断裂在高新区一带的空间展布和晚第四纪活动性开展了多条钻孔联合剖面精确定位和综合分析,揭示该段断裂分为东、西两支,东支为晚更新世断裂,西支为全新世断裂,并呈不连续的右阶斜列状,并非简单的剪切拉张阶区样式.探测结果为郯庐断裂带未来地震危险性评价和新沂市抗震设防提供了新的资料和认识.
The Anqiu-Juxian Fault(F5)in the Tanlu Fault Zone is the seismogenic fault of the Tancheng M81/2 earthquake in 1668.The surface rupture caused by this earthquake may have extended to the area of South Maling Mountain,south of Xinyi City center.The results of active fault detection in Xinyi City indicate that F5 passes through Xinyi City in the form of a concealed fracture,which is a Holocene active fault.On this basis,this paper carried out the precise positioning and comprehensive analysis of the joint profiles of multiple drillholes in terms of the spatial distribution and Late Quaternary activity of F5 in the high-tech zone,revealing that the fault is divided into the east and west branches,with the east branch being a Late Pleistocene fault and the west branch being a Holocene fault,showing a discontinuous right-ordered diagonal lineup,which is not a simple shear tensile order area.The results provide new information and understanding for the future seismic hazard evaluation of the Tanlu Fault Zone and the earthquake fortification of Xinyi City.
潘容清;陈立春;李彦宝;曹筠;王洪达;王文超
桂林理工大学,广西 桂林 541006中国地震局地质研究所,地震动力学国家重点实验室,北京 100029河北省地震局,石家庄 050021
地球科学
郯庐断裂带安丘—莒县断裂活动断裂晚第四纪钻孔联合剖面
Tanlu faultAnqiu-Juxian faultActive faultLate QuaternaryDrilling joint profile
《华南地震》 2024 (003)
11-22 / 12
国家重点研发项目:多尺度潜在震源判别及模型构建技术研究(2022YFC3003501)
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