首页 >  2018, Vol. 22, Issue (s1) : 56-63

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引用本文:

DOI:

10.11834/jrs.20187167

收稿日期:

2017-06-29

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多地球物理场观测的玉树地震孕育过程分析
1.中国地震局地震预测研究所, 北京 100036;2.中国科学院地壳应力研究所, 北京 100085;3.中国地震局第一监测中心, 天津 300180;4.中国地质大学地球物理与空间信息学院, 武汉 430074
摘要:

多地球物理场探测是研究地震孕育机理的关键,而卫星遥感探测为此提供了技术支撑。利用区域GPS应变场、基于汶川震源模型的应力触发效应等,全面综合地震学、重力场、地球化学、红外、电离层等多种参量研究结果,针对2010年4月14日玉树7.1级地震前多地球物理场参量进行整合分析,勾画了玉树地震多参数异常时间序列发展框图,确立了玉树地震独立孕育发生的特性,其中遥感探测技术显示了在地基测站稀疏区域的独特监测优势。结果发现,根据多地球物理探测参量的异常响应,玉树地震可分为3个不同的孕育阶段,不同应力状态下的岩石激发不同的地球物理场异常信息,长期监测GPS应力应变变化比较显著,而临震阶段以空间电磁扰动为主,多地球物理场之间的耦合关联还需深入研究。

Analysis on the Yushu earthquake preparation process based on multi-geophysical field observations
Abstract:

Multi-geophysical field observation is the main academic domain in research on earthquake preparation mechanisms, and satellite-based remote sensing technologies provide strong support for this study. To obtain a comprehensive understanding of the 2010 Yushu earthquake, the earthquake preparation process was studied based on multi-geophysical field observations.
The regional strain field was inversed from GPS data, and co- and post-stress effects were discussed by applying the focal mechanism model from the Wenchuan earthquake to the Yushu earthquake to distinguish their relationship. Then, all the precursors to the Yushu earthquake were collected and classified by their occurrence time and the parameters of GPS strain, gravity, electromagnetic fields, and infrared.
The independence of the Yushu earthquake in terms of its preparation process and occurrence was verified by using regional GPS stress and strain field results and with the stress-triggering effects of the Wenchuan earthquake used as basis. The developing time chart of various anomalous information of the Yushu earthquake, which occurred on April 14, 2010, was drawn by integrating multi-geophysical parameters and combining the related results of seismology, gravity field, geochemical, infrared, and ionospheric monitoring studies. The remote sensing technologies present special monitoring advantages in the region with sparse station distribution.
The three typical preparation processes of the Yushu earthquake can be divided based on the corresponding response of multi-geophysical parameters, and the underground rock in different stress states can excite anomalies in different geophysical fields. GPS stress and strain fields are the main parameter in long-term earthquake monitoring, and the space electromagnetic field presents evident perturbations in the impending time period. The coupling process and connections among multi-geophysical fields require further investigation. Satellite-based remote sensing technologies play important roles in this earthquake analysis and show significant advantages in regions with few seismic stations.

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