| 2013 年芦山MS7.0 地震前甘孜台地电阻率变化分析 |
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| 引用本文： | 解滔,卢军,任越霞,赵民渊. 2013 年芦山MS7.0 地震前甘孜台地电阻率变化分析[J]. 中国地震研究, 2014, 0(3): 388-402 |
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| 作者姓名： | 解滔 卢军 任越霞 赵民渊 |
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| 作者单位： | 中国地震台网中心，北京100045;中国地震台网中心，北京100045;四川省地震局，成都 610041;甘孜地震台，甘孜 626700 |
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| 基金项目： | This work is supported by the National Science and Technology Support Program （2012BAK19B02-03） and Natural Science Foundation of China （41204057）. The authors are grateful to Zhang Maojun of the Earthquake Administration of Sichuan Province and the crews of Garz~ Seismic Station for their help in field anomaly confirmation work and for the helpful data they provided. This paper has been published in Chinese in the journal of Technology for Earthquake Disaster Prevention, Volume 8, Number 4, 2013. |
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| 摘 要： | A trend increase in apparent resistivity has been observed in the N30°E monitoring direction at Garze Seismic Station since July 2011. This increase trend in geo-electric resistivity has been observed in the N60°W direction since 2012. During the period of the increase, the national highway No.317 was expanded in the monitoring area, so the potential electrodes in the N30°E direction had to be moved 10m towards the current electrodes. We interpreted the electric sounding data of Garz6 Seismic Station with a horizontally layered model. Analysis based on this model showed that the shift of potential electrodes can cause a 4 l-l.m rise to the measurements in the N30°E direction. Therefore, apparent resistivity of the two directions increased in the same time in 2012 after offsetting the effects from electrodes shift. Sensitivity coefficients of the two observation directions were also obtained using the model. Sensitivity coefficients of both directions were negative for the shallow layers, which can well explain the unexpected annual variations of Garze Seismic Station. In order to quantitatively analyze the effects from the expansion of the national highway on the observation, we constructed a finite element model based on the electrical structure. Analysis results also suggested that the expansion of the national highway could only cause a 0. 15 Ω·m decrease in the N60°W monitoring direction and 0. 1 Ω· m increase in the N30°E direction. Additionally, the valley values of annual variation of 2013 were distinctively higher than that of other years since 2008, meaning that there was an abnormal rise in apparent resistivity in the two observation directions at Garz~ Seismic Station before the Lushan earthquake. However, the rise was contrary to the decline variation before the Wenchuan earthquake. Therefore, it is still unsure whether or not the rise variation is related to the Lushan earthquake.
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| 关 键 词： | 电阻率变化 庐山 前视 视电阻率 高速公路 分层模型 地震台 灵敏度系数 |
| 收稿时间： | 2013-07-19 |
Analysis on Apparent Resistivity Variations of Garze Station before the 2013 Lushan Ms 7. 0 Earthquake1 |
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| Xie Tao,Lu Jun,Ren Yuexia and Zhao Minyuan. Analysis on Apparent Resistivity Variations of Garze Station before the 2013 Lushan Ms 7. 0 Earthquake1[J]. Earthquake Research in China, 2014, 0(3): 388-402 |
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| Authors: | Xie Tao Lu Jun Ren Yuexia Zhao Minyuan |
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| Affiliation: | China Earthquake Networks Center, Beijing 100045, China;China Earthquake Networks Center, Beijing 100045, China;Earthquake Administration of Sichuan Province, Chengdu 610041, China;Garzê Seismic Station, Garzê 626700, Sichuan, China |
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| Abstract: | Lushan earthquake Garze Seismic Station Apparent resistivity Trendincrease Annual variation |
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| Keywords: | Lushan earthquake Garze Seismic Station Apparent resistivity Trendincrease Annual variation |
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