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2010年4月14日玉树7.1级地震前异常特征及强震动力学关系探讨
马玉虎, 陈玉华
青海省地震局
摘要:
系统地分析了2010年4月14日玉树7.1级地震的地震活动性异常、前兆异常以及震前动物反常行为。研究表明,玉树7.1级地震前异常并不丰富,但觉察到的异常突出。其中中长期异常有6级、5级和4级的平静区; 前兆观测有玉树表层水温、德令哈表层水温和平安电磁波等显著异常; 同时震前1周还存在数量较多的动物宏观异常现象; 主震前130min发生了一次4.7级地震。结合1996年以来巴颜喀拉地块边界的强震震源机制解,探讨了玉树地震孕育的动力学过程。结果表明,1996年喀喇昆仑山口7.1级、1997年玛尼7.5级和2010年玉树7.1级地震是同一动力学过程下的强震事件,且中长期存在的不同震级档平静区演化可能与上述动力学过程有关。还对强震原地复发、前震识别和玉树地震中的前兆观测等科学问题进行了讨论。
关键词:  玉树地震  地震活动异常  前兆异常  动力学过程  强震复发  前震识别
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基金项目:中国地震局监测预报司2011年震情跟踪(2020地震短临攀登计划2011016301)资助
Study on the characteristics of anomaly before the April 14,2010 Yushu MS7. 1 earthquake and its dynamic relationship
Ma Yuhu, Chen Yuhua
Earthquake Administration of Qinghai Province,Xining 810001,China
Abstract:
The authors studied on the seismic activity,precursory anomalies and abnormal animal behavior before the Yushu MS7. 1 earthquake on April 14,2010. Analysis showed that anomalies were not rich before the Yushu MS7. 1 earthquake,but those observed were prominent. There were MS6. 0,MS5. 0 and MS4. 0 seismic calm regions of long and medium-term trend anomalies. Precursor anomalies included Yushu and Delingha surface temperatures and Ping'an electromagnetics. There were a large number of animals macro phenomenon week before the earthquake. There was a MS4. 7 earthquake 130 minutes before the main shock. The authors studied the dynamic process of Yushu earthquake preparation with the Bayan Har block boundary earthquake focal mechanism since 1996. The results showed that the Karakorum MS7. 1 earthquake 1996,the Mani MS7. 5 earthquake and the Yushu MS7. 1 earthquake were events in the same dynamic process. And long and medium-term trend anomalies may be related to the dynamics of the evolution of different earthquakes. The paper also discusses strong earthquake recurrence interval, foreshock identification and precursor observation of Yushu MS7. 1 earthquake.
Key words:  Yushu MS7. 1 earthquake Anomaly of seismic activity Precursory anomaly Dynamic process Strong earthquake recurrence interval Foreshock iden tification