滑动自相关方法在地电阻率观测资料分析中的应用初探

doi:10.3969/j.issn.0253-4967.2016.04.017

地震地质 ›› 2016, Vol. 38 ›› Issue (4): 1019-1029.DOI: 10.3969/j.issn.0253-4967.2016.04.017

滑动自相关方法在地电阻率观测资料分析中的应用初探

安张辉^1,2, 詹艳³, 陈小斌³, 姜峰³, 高悦^1,2

1. 中国地震局兰州地震研究所, 兰州 730000;
2. 中国地震局地震预测研究所, 兰州科技创新基地, 兰州 730000;
3. 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

收稿日期:2015-09-25 修回日期:2016-05-21 出版日期:2016-12-20 发布日期:2017-01-20
作者简介:安张辉,男,1978年生,2004年毕业于中国地震局兰州地震研究所,获固体地球物理学硕士学位,副研究员,主要从事地震电磁学研究和全国地电台网技术管理工作,电话:0931-8277101,E-mail:anzhanghui5@gsdzj.gov.cn。
基金资助:
甘肃省科技计划项目（145RJZA030）；中国地震局系统交流访问学者学习经费与中国地震局地震预测研究所基本科研业务专项（2012IESLZ04）共同资助

SHIFTING SELF-CORRELATION METHOD INITIALY USED IN THE APPARENT RESISTIVITY OBSERVATION DATA

AN Zhang-hui^1,2, ZHAN Yan³, CHEN Xiao-bin³, JIANG Feng³, GAO Yue^1,2

1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;
2. Lanzhou Base of Institute of Earthquake Prediction, China Earthquake Administration, Lanzhou 730000, China;
3. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China

Received:2015-09-25 Revised:2016-05-21 Online:2016-12-20 Published:2017-01-20

摘要/Abstract

摘要：

提出了地电阻率滑动自相关数据处理方法，利用随机时间序列对方法进行了数值检验，验证了方法的有效性。将滑动自相关方法应用于3个地电阻率台站实际观测资料，经分析研究得到了一些比较有意义的结果：1）甘孜台和山丹台地电阻率滑动相关系数变化与地震事件有较好的对应关系，主要表现为，在震前半年到1年时间范围内，会出现相关系数阶段性增大现象，同时，这2个台站的相关系数异常也表现出比较强的各向异性特征；2）成都台地电阻率观测虽受干扰较为严重，但相关系数异常现象与地震事件仍有比较好的对应关系，除了说明所使用方法的有效性之外，还可能与参加计算的地震事件震级比较大，震中距较小，以及发震时间比较集中有关，在该台站同样也存在异常的各向异性特征；3）通过对比不同震级特征地震的相关研究结果得出，当选择的特征地震震级较小时，不同地震的震前异常幅度会有所不同，但当震级较大时（如M_S≥5.0），其对研究结果产生的影响非常有限。此外，还对地电阻率地震异常的各向异性，以及特征地震的选取问题进行了简单论述。

Abstract:

In this paper,we propose a method of seismic prediction using the geo-electric resistivity shifting self-correlation (SSC),and a numerical test is carried out using random time series analysis to verify the validity of the method.The SSC method is applied to the actual observation data of three geo-electric resistivity stations,and results are obtained as follows:(1) SSC coefficient changes in Ganzi and Shandan stations have good correspondence to earthquake,which is represented mainly by the phased increase of correlation coefficient appearing six months to a year before the earthquake.At the same time,the correlation coefficient anomalies of the two stations also exhibit strong anisotropy.(2) Although Chengdu geo-electric resistivity station had suffered serious disturbance,the correlation coefficient anomaly also has a good correspondence with earthquake.In addition to the validity of the SSC method,it may also be attributed to the magnitude of the earthquake event,the smaller distance of epicenter,and the time of the earthquake.Anisotropy also exists in the anomaly at Chengdu station.(3) By comparing the characteristics of different magnitudes of earthquakes,the results are obtained that,when the magnitude of the selected characteristic earthquake is relatively small,the amplitude of the anomaly before earthquake is different,but when the magnitude is larger,for example M_S ≥ 5.0,the impact on the results of this study is very limited.In addition,we briefly discussed the anisotropy of seismic geoelectrical resistivity anomalies and the selection of the characteristic earthquake.

Key words: shifting self-correlation method, apparent resistivity, earthquake anomaly, correlation coefficient, anisotropy

中图分类号:

P631.3⁺22

安张辉, 詹艳, 陈小斌, 姜峰, 高悦. 滑动自相关方法在地电阻率观测资料分析中的应用初探[J]. 地震地质, 2016, 38(4): 1019-1029.

AN Zhang-hui, ZHAN Yan, CHEN Xiao-bin, JIANG Feng, GAO Yue. SHIFTING SELF-CORRELATION METHOD INITIALY USED IN THE APPARENT RESISTIVITY OBSERVATION DATA[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(4): 1019-1029.

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滑动自相关方法在地电阻率观测资料分析中的应用初探

SHIFTING SELF-CORRELATION METHOD INITIALY USED IN THE APPARENT RESISTIVITY OBSERVATION DATA

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