2015年9月14日河北昌黎发生MS 4.2地震,收集整理易县地震台四分量钻孔应变仪观测数据,基于面应变和切应变视角进行分析,发现二者在震前出现异常变化,且2组面应变相关系数在震前数天即出现异常,该异常或可作为中小地震前应力应变异常识别的信息之一。
On September 14, 2015, an MS 4.2 earthquake occurred in Changli, Hebei Province. The observation data of the four-component borehole strain gauge at Yixian Seismic Station were collected and analyzed from the aspects of surface strain and shear strain. It was found that they had abnormal changes before the earthquake, and the two groups of surface strain correlation coefficients showed anomalies several days before the earthquake. This anomaly may be one of the information for identifying stress-strain anomalies before small and medium earthquakes.
2021,42(4): 127-132 收稿日期:2021-01-28
DOI:10.3969/j.issn.1003-3246.2021.04.016
基金项目:河北地震科技星火计划面上项目(项目编号:DZ20170509033)
作者简介:赵慧琴(1982-),女,硕士研究生,高级工程师,2010-2016年主要从事形变观测工作,2016年至今主要从事流动地磁监测及分析工作。E-mail:zhaohuiqinzhjk@163.com
参考文献:
池顺良,张晶,池毅. 汶川、鲁甸、康定地震前应变数据有自洽到失洽的转变与地震成核[J]. 国际地震动态,2014,32(12):3-13.
蒲小武,王康,梅东林,等. 武都四分量钻孔应变观测数据分析[J]. 地震地磁观测与研,2013,34(5/6):328-333.
邱泽华,杨光,唐磊,等. 芦山M 7.0地震前姑咱台钻孔应变观测异常[J]. 大地测量与地球动力学,2015,35(1):158-166.
苏恺之,李海亮. 钻孔法地应变新进展[M]. 北京:地震出版社,2004.
苏恺之. 地应力测量方法[M]. 北京:地震出版社,1985.
苏恺之. 四分量钻孔应变仪计算式梳理及震例应用[J]. 地震地磁观测与研究,2018,39(5):101-111.
苏恺之. 中国四分量钻孔应变仪风雨历程四十年[J]. 地震地磁观测与研究,2020,41(2):172-180.
张凌空,牛安福. 分量式钻孔应变观测耦合系数的计算[J]. 地球物理学报,2013,56(9):3 029-3 037.
赵慧琴,王艳,张肖,等. 易县地震台四分量钻孔应变观测震前异常特征[J]. 地震地磁观测与研究,2017,38(4):159-163.
Kong Xiangyang, Su Kaizhi, Fujinawa Yukio, et al. A Detection Method of Earthquake Precursory Anomalies Using the Four-Componnent Borehole Strainmeter[J]. Scientific Research Publishing, 2018, 7: 124-140.
Su Kaizhi. A Review of the Calculation Formula for the Four-component Boreholes Strainmeter and Application ti Earthquake Cases[J]. Earthquake Research in China, 2019, 33(1): 132-146.