[1]叶媛媛,王志栋,姜振海.张掖MS5.0级地震前高台钻孔应变异常变化研究[J].华南地震,2021,41(04):56-62.[doi:10.13512/j.hndz.2021.04.07]
　YE Yuanyuan,WANG Zhidong,JIANG Zhenhai.The Abnormal Change of Borehole Strain at Gaotai Seismic Station Before Zhangye MS 5.0 Earthquake[J].,2021,41(04):56-62.[doi:10.13512/j.hndz.2021.04.07]
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张掖MS5.0级地震前高台钻孔应变异常变化研究()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
41
期数:
2021年04期
页码:
56-62
栏目:
地震科学研究
出版日期:
2021-12-15

文章信息/Info

Title:
The Abnormal Change of Borehole Strain at Gaotai Seismic Station Before Zhangye MS 5.0 Earthquake
文章编号:
1001-8662（2021）04-0056-07
作者:
叶媛媛; 王志栋; 姜振海
甘肃省地震局，兰州 730000
Author(s):
YE Yuanyuan; WANG Zhidong; JIANG Zhenhai
Gansu Earthquake Agency ， Lanzhou 730000， China
关键词:
关键字：钻孔应变; 小波分析; 超限分析; 前兆异常
Keywords:
Borehole strain; Wavelet analysis;  Transfinite analysis; Precursory anomaly
分类号:
P315.73
DOI:
10.13512/j.hndz.2021.04.07
文献标志码:
A
摘要:
张掖MS5.0级地震前，高台分量式钻孔应变出现了显著的异常变化，排除供电、调零、气压等影响观测数据的干扰因素，研究发现该异常可能是地震前兆异常。利用离散小波分解、超限率、应变变化过程和方位角变化等分析方法提取异常，综合分析发现：NE分量和NW分量出现了破年变低值异常，NE分量较往年最低点达到-64745.46×10-8，超出同期2013—2018年年变均值54.38%，NW分量数据最低点达到最低值-65663.8×10-8，最大超出同期2013—2018年年变均值17.68%；求解（ε1，ε2，φ）后，半长轴ε2持续缓慢增大，半短轴ε1加速增大张力增强，达到最大值26814.1×10-8，后张力加速减小至6441.6×10-8，震后应力逐步恢复至同期均值大小。方位角φ出现大幅偏转；替换量的差分曲线、小波分解曲线、超限率曲线在4月至8月出现明显毛刺增加现象。地震前兆异常明显，异常信息可靠。
Abstract:
Before Zhangye MS5.0 earthquake，the component borehole strain of the Gaotai station had a significant abnormal change. Excluding the interference factors such as power supply，zero adjustment and air pressure，the study found that the anomaly may be an earthquake precursor anomaly. This paper use discrete wavelet decomposition， transfinite rate， strain process and azimuth change analysis methods to extract anomalies. The comprehensive analysis shows that：the NE component and NW component have the low value anomaly of breaking annual variation. Compared with the lowest point in previous years， the NE component has reached-64 745.46×10-8，which is 54.38% higher than the average annual variation of the same period from 2013 to 2018. The lowest point of NW component data has reached the lowest value of -65 663.8×10-8， which is 17.68% higher than the average annual variation of the same period from 2013 to 2018.After solving (ε1, ε2, φ)， the semi-major axis ε2 continues to increase slowly， the semi-minor axis ε1 increases at an accelerated rate and the tension increases. After reaching the maximum value of 26 814.1×10-8，the tension decreased to 6441.6×10-8 at an accelerated rate， and the post earthquake stress gradually recovered to the mean value of the same period. There is a large deflection of azimuth angle. The difference curve， wavelet decomposition curve and overrun rate curve of replacement quantity increased obviously from April to August. The earthquake precursory anomalies are obvious and the anomaly information is reliable.

参考文献/References:

[1]蒋靖祥，尹光华，哈斯高娃，等.钻孔应变仪在地震前的记录及地震预测[J].地震研究，2000，23（4）：410-417.
[2]蒋靖祥，尹光华，王在华，等.发展钻孔应变观测的战略构想[J].国际地震动态，2004（11）：7-14.
[4]邱泽华，唐磊，周龙寿，等.四分量钻孔应变台网汶川地震前的观测应变变化[J].大地测量与地球动力学，2009，29：（1）1-5.
[5]牛安福，张凌空，闫伟，等.中国钻孔应变观测能力及在地震预报中的应用.大地测量与地球动力学，2011，31（2）：48-52.
[6]李淑恭.钻孔应变、应力地震中短临前兆异常特征及预报方法研究[J].地壳构造与应力文集，2001（14）：115-125.
[7]邱泽华.钻孔应变观测理论和应用[M].北京：地震出版社2017.
[8]钟继茂，李祖宁，谢志招，等.用多分量钻孔应变仪资料推算测区附加应变场方向[J].大地测量与地球动力学，2011， 31（1）：29-33.
[9]戴勇，高立新，杨彦明，等.基于小波变换方法的包头台形变分析[J].华南地震，2013，33（4）：39-46.
[10] DaubechiesI. Orthonormal bases of compactly supported wavelets[J]. Pureand Appl Math，1988（41）：909-996.
[11] Grossmann，A.，Morlet，J.Decomposition of Hardy functions into square integrable wavelets of constant shape[J]. SIAM Journal on Mathematical Analysis，1984（15）：723-736.
[12] Mallat，S. G. A theory for multiresolution signal decom-position：the wavelet representation[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence，1989（11）：674-693.
[13]王志栋，雷正超，寇俊阳，等. MS 5.0地震前山丹地震台地电阻率异常分析[J].地震地磁观测与研究，2020，41（4）：83-89.

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备注/Memo

备注/Memo:
收稿日期：2021-03-29
基金项目：中国地震局监测、预报、科研三结合课题（3JH-2021049）
作者简介：叶媛媛(1982- )，女，工程师，主要从事地球物理台网观测与科研工作。E-mail：49371733@qq.com
通信作者：姜振海(1971- )，男，高级工程师，主要从事定点形变资料观测和分析工作。E-mail：jiangzh1971@163.com
更新日期/Last Update: 2021-12-15