利用重复地震观测地壳介质变化

地震 ›› 2007, Vol. 27 ›› Issue (3): 1-9.

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利用重复地震观测地壳介质变化

周龙泉¹, 刘桂萍², 马宏生³, 华卫⁴

1.中国地震台网中心, 北京 100036;
2.中国地震局监测预报司, 北京 100036;
3.中国地震局地震预测研究所, 北京 100036;
4.广东省地震局, 广东广州 510070

收稿日期:2007-01-15 修回日期:2007-02-05 出版日期:2007-07-31 发布日期:2021-10-29
作者简介:周龙泉(1976-), 男, 江西南丰人, 2005年获博士学位, 主要从事地震层析成像和地震预测等研究。
基金资助:
地震科学联合基金项目(106016)

Monitoring crustal media variation by using repeating earthquakes

ZHOU Long-quan¹, LIU Gui-ping², MA Hong-sheng³, HUA Wei⁴

1. China Earthquake Networks Center, CEA, Beijing 100036;
2. Monitoring and Prediction Department, CEA, Beijing 100036;
3. Institute of Earthquake Science, CEA, Beijing 100036;
4. Earthquake Administration of Guangdong Provinces, Guangzhou 510070, China

Received:2007-01-15 Revised:2007-02-05 Online:2007-07-31 Published:2021-10-29

摘要/Abstract

摘要： 利用天然重复地震观测地壳介质速度随时间的变化, 其精度主要受地震定位精度、重复地震位置不一致以及震相读取误差等影响, 这限制了其在实际中的应用。文中提出利用射线追踪方法对重复地震进行位置归一处理, 并且采用波形互相关技术消除震相读取误差影响, 从而达到提高精度的目的。根据上述方法原理, 利用大姚地区重复地震观测该地区地壳介质随时间的变化。结果表明, 该方法能够有效地提高测量的精度, 并且显示在2003年大姚6.2级、 6.1级地震前出现了短期的地壳介质速度明显升高的现象。

关键词: 重复地震, 射线追踪, 波形互相关, 地壳介质变化, 大姚地震

Abstract: The accuracy of measuring crustal media variation by using repeating earthquakes is controlled by several factors, including the accuracy of earthquake location, dissimilar position of repeating earthquakes, and the error of phase reading, which restrict its application in practice. In this paper we present normalizing the position of repeating earthquakes by using ray tracing, and eliminating the effects of phase reading error by waveform cross-correlation methods that improve the precision in measuring media variation with time. According to the methods mentioned above, we measured the variations of Dayao crustal media with time by using repeating earthquakes. The results indicate that the measuring accuracy can be effectively improved by this method, showing that the short-term velocity variation of crustal media appears before Dayao M=6.2 and M=6.1 earthquakes in 2003.

Key words: Repeating earthquakes, Ray tracing, Waveform cross-correlation, Variation of crustal media, Dayao earthquake

中图分类号:

P315.7

周龙泉, 刘桂萍, 马宏生, 华卫. 利用重复地震观测地壳介质变化[J]. 地震, 2007, 27(3): 1-9.

ZHOU Long-quan, LIU Gui-ping, MA Hong-sheng, HUA Wei. Monitoring crustal media variation by using repeating earthquakes[J]. EARTHQUAKE, 2007, 27(3): 1-9.

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利用重复地震观测地壳介质变化

Monitoring crustal media variation by using repeating earthquakes

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