利用重复地震观测重庆武隆地区地壳介质变化

来源 :地震科学进展 | 被引量 : 0次 | 上传用户：g348386408

【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.

【作者】

：

汪建杨亚运马伟

【机构】

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重庆市地震局,重庆 401147

【出处】

：

地震科学进展

【发表日期】

：

2021年11期

【关键词】

：

重复地震射线追踪 P波走时差武隆地区

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