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| 引用本文： | 邱泽华,杨光,唐磊,郭燕萍,张宝红.??M7.0????????????????????[J].大地测量与地球动力学,2015,35(1):158-161. |
| 作者姓名： | 邱泽华 杨光 唐磊 郭燕萍 张宝红 |
| 作者单位： | 1 国地震局地壳应力研究所， 北京市安宁路庄1号， 100086 2 川省地震局姑咱地震台， 四川省康定县， 626001 |
| 摘 要： | ??M7.0??????????????YRY-4???????????????????????仯?????????仯??????????????????????????￥??????????????????????????????????????????????????????·???????????????′????λ?仯??????????飬???????????????????????????????仯??????????????????仯???????????????????????????????????????????????????????г???????? |
| 关 键 词： | ?????? ??????? ???????? YRY-4?????????? ???? |
| 收稿时间： | 2014-07-05 |
Abnormal Strain Changes Prior to the M7.0 Lushan Earthquake Observed by a Borehole Strainmeter at Guzan |
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| QIU Zehua,YANG Guang,TANG Lei,GUO Yanping,ZHANG Baohong.Abnormal Strain Changes Prior to the M7.0 Lushan Earthquake Observed by a Borehole Strainmeter at Guzan[J].Journal of Geodesy and Geodynamics,2015,35(1):158-161. | |
| Authors: | QIU Zehua YANG Guang TANG Lei GUO Yanping ZHANG Baohong |
| Institution: | 1 nstitute of Crustal Dynamics, CEA, 1 Anningzhuang Road,Beijing 100085, China 2 uzan Seismic Station, Earthquake Administration of Sichuan Province, Kangding 626001, China |
| Abstract: | For several days just before the M7.0 Lushan earthquake, the YRY-4 four-gauge borehole strainmeter at Guzan, Sichuan, recorded prominent abnormal changes. The strain anomalies are striking on the smooth background of several years recording after Wenchuan earthquake. However, as the small town of Guzan is in rapid development presently, constructions of various kinds significantly affect the observation. Whether or not the observed anomalies before the Lushan earthquake were caused by any of the constructions is a question that must be answered. Among all the interferences, apartment building, sports ground reconstruction and tunnel cutting can be first excluded by an analysis of the typical figure of the anomalies. Two other possible interferences are: the road construction in front of the station, and the flow variation of the nearby Daduhe river due to the building of an upstream reservoir. Local investigation, comparison of strain and seismographic recordings, comparison of strain and Daduhe river flow recordings, and analysis of the sense of the strain anomalies have been carried out. It is concluded that the abnormal variations cannot be attributed to any interferences, but should be related to Lushan earthquake. |
| Keywords: | Lushan earthquake precursor of earthquake strain monitoring in borehole YRY-4 four-gauge borehole strainmeter (FGBS) interference |
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