| 利用重复地震观测重庆武隆地区地壳介质变化 |
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| 作者姓名： | 汪建 杨亚运 马伟 |
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| 作者单位： | 重庆市地震局，重庆401147 |
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| 基金项目： | 中国地震局监测、预报、科研三结合项目（3JH-2021040）与重庆市地震局科研项目联合资助。 |
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| 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。
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| 关 键 词： | 重复地震 射线追踪 P波走时差 武隆地区 |
| 收稿时间： | 2021-10-16 |
Monitoring variation of crustal media in Wulong area of Chongqing Municipality by using repeating earthquakes |
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| Institution: | Chongqing Earthquake Agency, Chongqing 401147, China |
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| 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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