| 姑咱地震台张应变异常信号与修路施工间关系探讨 |
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| 引用本文： | 张凌空,牛安福.姑咱地震台张应变异常信号与修路施工间关系探讨[J].地震地磁观测与研究,2021,42(1):98-104. |
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| 作者姓名： | 张凌空 牛安福 |
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| 作者单位： | 中国北京100045 中国地震台网中心 |
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| 基金项目： | 国家科技支撑计划项目（项目编号：2012BAK19B02-02） |
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| 摘 要： | 与2008年5月12日汶川MS8.0地震时记录到的大量压应变异常信号不同,2013年4月芦山MS7.0地震前后姑咱地震台钻孔应变仪记录到的却是显著张应变异常,特别是临震前几日信号大幅度突升,而该时段恰巧台站大门前进行修路施工,这究竟是地球物理异常还是干扰,一直有很大争议。研究发现,这些异常信号在时间上具有高度的准同步性,即都发生在白天8:00—10:00或7:30—17:00之间,这正是工人的上班时间,而自然力产生的异常应具有随机性特征,不应有较强规律性;其次,临震前的异常振幅比芦山地震本身产生的振幅还大2倍,将其视为地球物理异常也有违常理。又结合腾冲地震台钻孔应变观测干扰实例进行分析,认为尚不能排除该张应变异常为施工干扰的可能性。
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| 关 键 词： | 四分量钻孔应变仪 张应变异常信号 时间的准同步性 施工影响 芦山MS7.0地震 |
Discussion on the relationship between the abnormal signal of tensional strain and the construction of road repair at Guza station |
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| ZHANG Lingkong,NIU Anfu.Discussion on the relationship between the abnormal signal of tensional strain and the construction of road repair at Guza station[J].Seismological and Geomagnetic Observation and Research,2021,42(1):98-104. |
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| Authors: | ZHANG Lingkong NIU Anfu |
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| Institution: | China Earthquake Networks Center, Beijing 100045, China |
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| Abstract: | Different from a large number of abnormal signals of compressive strain recorded in the Wenchuan MS 8.0 earthquake in May 2008, significant tensional strain abnormal signals were recorded by a borehole strainmeter before and after the Lushan MS 7.0 strong earthquake in April 2013 at Guza seismic station. Especially, signal amplitude significantly enlarged a few days before the earthquake. The time period coincides with the road construction before the station gate. There has been a lot of controversy on whether it is a precursor or a disturbance. It is found that these abnormal signals have high quasi synchronization in time. They all appeared at 8:00-10:00 or 7:30-17:00 in the daytime. This is the time for the workers to work. And the abnormality produced by the natural force should have the characteristic of randomness, and it should not have such a strong regularity. Secondly, the abnormal amplitude before the earthquake is 2 times larger than that produced by the Lushan earthquake, which is counterintuitive to be regarded as a precursor. Based on the analysis of the interference examples of borehole strain observation at the Tengchong station, it is believed that the possibility of construction interference cannot be excluded. |
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| Keywords: | four component borehole strainmeter tensional strain abnormal signal quasi synchronism of time construction influence Lushan MS 7 0 earthquake |
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