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ISSN 2096-7780 CN 10-1665/P

汪建, 杨亚运, 马伟. 利用重复地震观测重庆武隆地区地壳介质变化 [J]. 地震科学进展, 2021, (11): 498-504. doi: 10.3969/j.issn.2096-7780.2021.11.003" target="_blank"> 10.3969/j.issn.2096-7780.2021.11.003" target="_blank" class="mainColor"> 10.3969/j.issn.2096-7780.2021.11.003" target="_blank"> 10.3969/j.issn.2096-7780.2021.11.003.
引用本文: 汪建, 杨亚运, 马伟. 利用重复地震观测重庆武隆地区地壳介质变化 [J]. 地震科学进展, 2021, (11): 498-504. doi: 10.3969/j.issn.2096-7780.2021.11.003" target="_blank"> 10.3969/j.issn.2096-7780.2021.11.003" target="_blank" class="mainColor"> 10.3969/j.issn.2096-7780.2021.11.003" target="_blank"> 10.3969/j.issn.2096-7780.2021.11.003.
Wang Jian, Yang Yayun, Ma Wei. Monitoring variation of crustal media in Wulong area of Chongqing Municipality by using repeating earthquakes [J]. Progress in Earthquake Sciences, 2021, (11): 498-504. doi: 10.3969/j.issn.2096-7780.2021.11.003" target="_blank"> 10.3969/j.issn.2096-7780.2021.11.003" target="_blank" class="mainColor"> 10.3969/j.issn.2096-7780.2021.11.003" target="_blank"> 10.3969/j.issn.2096-7780.2021.11.003.
Citation: Wang Jian, Yang Yayun, Ma Wei. Monitoring variation of crustal media in Wulong area of Chongqing Municipality by using repeating earthquakes [J]. Progress in Earthquake Sciences, 2021, (11): 498-504. doi: 10.3969/j.issn.2096-7780.2021.11.003" target="_blank"> 10.3969/j.issn.2096-7780.2021.11.003" target="_blank" class="mainColor"> 10.3969/j.issn.2096-7780.2021.11.003" target="_blank"> 10.3969/j.issn.2096-7780.2021.11.003.

利用重复地震观测重庆武隆地区地壳介质变化

Monitoring variation of crustal media in Wulong area of Chongqing Municipality by using repeating earthquakes

  • 摘要: 选取重庆数字地震台网记录的武隆地区107次ML≥1.5地震波形和观测报告资料,采用波形互相关技术进行相关计算,识别出12组同时被3个地震台站记录且各台波形互相关系数不小于0.8的重复地震。利用射线追踪方法,对武隆地区重复地震位置做归一化处理,得到所选台站记录地震P波走时差变化,结果显示:在2017年武隆MS5.0地震前4年,武隆、仙女山、涪陵地震台记录到P波走时差均存在长期的负异常变化,持续时间长达339天,共出现18次负值,表明该时段地壳介质速度有明显升高现象。

     

    Abstract: The waveform and observation report data of 107 earthquakes with ML≥1.5 recorded by Chongqing Digital Seismic Network in Wulong area were selected. The waveform cross-correlation technology was used for correlation calculation. 12 groups of repeating earthquakes with waveform correlation coefficient larger than 0.8 and recorded by 3 seismic stations at the same time were identified. The position of repeating earthquakes in Wulong area was normalized by ray tracing method, and the change of P-wave travel-time difference of the selected stations was obtained. The results show that four years before the 2017 Wulong MS5.0 earthquake, there are long-term negative abnormal changes in P-wave travel-time difference recorded by Wulong, Xiannushan and Fuling seismic stations, lasting for 339 days, with a total of 18 negative values. It shows that the crustal medium velocity increases obviously in this period.

     

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