| 天水钻孔应变可靠性分析及映震效能检验 |
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| 引用本文： | 李娜,冯建刚,张博,闫勋.天水钻孔应变可靠性分析及映震效能检验[J].西北地震学报,2020,42(5):1111-1116. |
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| 作者姓名： | 李娜 冯建刚 张博 闫勋 |
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| 作者单位： | 甘肃省地震局, 甘肃 兰州 730000;甘肃省地震局嘉峪关中心地震台, 甘肃 嘉峪关 735100 |
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| 基金项目： | 中国地震局兰州地震研究所地震科技发展基金青年基金（2019Q04）；甘肃省地震局优秀业务技术团队联合资助 |
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| 摘 要： | 通常利用4个元件的读数计算2个面应变数值及相关系数值（数据自检）对天水北道四分量钻孔应变仪观测数据进行可靠性检验，虽然自检效果差，但映震效能好。通过实地相对标定校正元件灵敏度，对观测数据进行校正，获得校正后的自恰性检验结果；根据不同震例情况，采用超限率方法和S变换方法分析校正后数据的映震效果，进一步论证观测资料的可靠性。结果表明，经过实地相对标定后天水钻孔应变观测数据自洽性提高，原始曲线中的异常变化形态在经过超限分析和高频分析后也异常显著，映震效能好，能够真实反映所处区域的构造活动和应变，对甘东南地区地震危险性有很好的地震指示意义，可以更好地用于区域地震预测和地震科学研究。
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| 关 键 词： | 四分量钻孔应变 实地相对标定 超限率分析 S时频变换 |
| 收稿时间： | 2020/7/10 0:00:00 |
Reliability Analysis of Borehole Strain Meters and Test of Earthquake-reflecting Efficacy in Tianshui |
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| LI N,FENG Jiangang,ZHANG Bo,YAN Xun.Reliability Analysis of Borehole Strain Meters and Test of Earthquake-reflecting Efficacy in Tianshui[J].Northwestern Seismological Journal,2020,42(5):1111-1116. |
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| Authors: | LI N FENG Jiangang ZHANG Bo YAN Xun |
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| Institution: | GansuEarthquake Agency, Lanzhou 730000, Gansu, China; Jiayuguan Seismic Station, Gansu Earthquake Agency, Jiayuguan 735100, Gansu, China |
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| Abstract: | To test the reliability of the observed data from the four-component borehole strain gauge at the Beidao Station in Tianshui City, readings from the four components are used to calculate the values of two surface strain and correlation values (data self-inspection). Although the self-inspection effect is poor, the seismic reflection effect is good. In this study, the sensitivity of the element is calibrated by in-situ relative calibration to correct the observed data and obtain the self-consistency test result after calibration. In accordance with different earthquake cases, the overrun rate and S-transform methods are used to analyze the seismic reflection effect of the corrected data and further demonstrate the reliability of the observed data. Results show that the self-consistent character of the Tianshui borehole strain observation data is improved after in-situ relative calibration. The form of abnormal changes in the original curve is also observed after overrun rate and high-frequency analyses. The improved data respond well to earthquakes and can reflect regional tectonic activity and strain factually. This study has a good denotative meaning to the seismic risk in southeastern Gansu and thus can be used as reference for regional earthquake prediction and earthquake scientific research. |
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| Keywords: | four-component borehole strain field relative calibration overrun rate analysis S-transform |
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