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Title:: Study on Sensitive Stations for Continuous Crustal Deformation Observation in North China

作者:: 马栋¹; 马利军²; 侯晓真¹; 屈曼¹; 高晨¹; (1.河北省地震局,河北石家庄 050021; 2.张家口中心台,河北张家口 075000)

Author(s):: MA Dong¹; MA Lijun²; HOU Xiaozhen¹; QU Man¹; GAO Chen¹; (1. Hebei Earthquake Agency,Shijiazhuang 050021,Hebei,China)(2. Central Seismological Station of Zhangjiakou,Zhangjiakou 075000,Hebei,China)

Keywords:: deformation observation; sensitive station; reflecting earthquake ability; North China

摘要:: 依据《中国震例》和部分震例总结报告,统计1966—2018年华北地区5.0级以上地震的形变异常; 结合形变台站及测项与地震的对应率、异常信度,分析华北地区形变台站及测项的灵敏度; 再将研究区划分为4个区域,分别统计测项灵敏度; 最后分析灵敏台站与所处构造位置关系。结果表明:太原台、张家口台、易县台等7个台站相对灵敏,且主要分布在张渤地震带西段和郯庐地震带北段; 水平摆在4个区域灵敏度较高,水管仪在山西地震带灵敏度较高,体应变在张渤地震带和郯庐地震带南段灵敏度较高,伸缩仪在郯庐地震带北段灵敏度较高; 正断性质断层上盘和逆断性质断层下盘附近的台站灵敏度相对较高。

Abstract:: According to Earthquake Cases in China and summary report on some earthquakes,we count the deformation anomaly of M_S≥5.0 earthquakes from 1966 to 2018 in North China. Based on the seismic correspondence and anomaly reliability of deformation stations and items,we analyze the sensitivity of deformation stations and items in North China. Then we obtained the sensitivity of items in four sub-sreas which were divided from the study area. Finally,the relationship between sensitive stations and their tectonic locations was analyzed. The results show that the sensitivity of some deformation stations is relatively high,includes Taiyuan,Zhangjiakou,and Yixian stations etc.,which mainly distributed in the west segment of Zhangjiakou-Bohai seismic active belt and the north segment of Tancheng-Lujiang seismic zone. The sensitivity of horizontal pendulum are higher in each sub-area,the sensitivity of water tube tiltmeter is higher in Shanxi seismic zone,the sensitivity of body strain is higher in Zhangjiakou-Bohai seismic active belt and south segment of Tancheng-Lujiang seismic zone,the sensitivity of extensometer is higher in north segment of Tancheng-Lujiang seismic zone. The sensitivity of the stations near the hanging wall of normal fault and the footwall of reverse fault is relatively high.