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
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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。
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.
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.
引文
陈立春、王虎、冉勇康等,2010,玉树MS7.1级地震地表破裂与历史大地震,科学通报,55(13),1200～1205。
陈颙,1978,用震源机制一致性作为描述地震活动性的新参数,地球物理学报,21,140～159。
刁桂苓、王晓山、高国英等,2010,以震源机制解类型划分汶川、玉树地震构造块体归属,地球物理学报,53(8),1778～1783。
倪四道、王伟涛、李丽,2010,2010年4月14日玉树地震:一个有前震的破坏性地震,中国科学,40(5),535～537。
李闽峰、邢成起、蔡长星等,1995,玉树断裂活动性研究,地震地质,17(3),218～224。
王阎昭、王恩宁、沈正康等,2008,基于GPS资料约束反演川滇地区主要断裂现今活动速率,中国科学D辑:地球科学,38(5),582～597。
闻学泽,1985,甘孜-玉树断裂带的新构造特征与地震危险性估计,地震地质,7(3),23～32。
闻学泽、徐锡伟、郑荣章等,2003,甘孜-玉树断裂的平均滑动速率与近代大地震破裂,中国科学D辑,33(B04),199～208。
周荣军、马声浩、蔡长星,1996,甘孜-玉树断裂带的晚第四纪活动特征,中国地震,12(3),250～260。
周荣军、闻学泽、蔡长星等,1997,甘孜-玉树断裂带的近代地震与未来地震趋势估计,地震地质,19(2),115～124。
陈颙,1978,用震源机制一致性作为描述地震活动性的新参数,地球物理学报,21,140～159。
刁桂苓、王晓山、高国英等,2010,以震源机制解类型划分汶川、玉树地震构造块体归属,地球物理学报,53(8),1778～1783。
倪四道、王伟涛、李丽,2010,2010年4月14日玉树地震:一个有前震的破坏性地震,中国科学,40(5),535～537。
李闽峰、邢成起、蔡长星等,1995,玉树断裂活动性研究,地震地质,17(3),218～224。
王阎昭、王恩宁、沈正康等,2008,基于GPS资料约束反演川滇地区主要断裂现今活动速率,中国科学D辑:地球科学,38(5),582～597。
闻学泽,1985,甘孜-玉树断裂带的新构造特征与地震危险性估计,地震地质,7(3),23～32。
闻学泽、徐锡伟、郑荣章等,2003,甘孜-玉树断裂的平均滑动速率与近代大地震破裂,中国科学D辑,33(B04),199～208。
周荣军、马声浩、蔡长星,1996,甘孜-玉树断裂带的晚第四纪活动特征,中国地震,12(3),250～260。
周荣军、闻学泽、蔡长星等,1997,甘孜-玉树断裂带的近代地震与未来地震趋势估计,地震地质,19(2),115～124。
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