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Title:: Discussion on Cause of Earthquake Mechanics and Precursory Mechanism:Re-study the Tangshan Earthquake

Author(s):: CHEN Lide; FU Hong; ZHANG Xiang; HU Xiaojing; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: earthquake precursor; magmatic activity; earthquake mechanics; earthquake prediction

摘要:: 简述弹性回跳学说、板块构造模型及岩浆活动型地震等地震力学成因的现有观点,并对其进行了讨论。通过分析唐山震区的壳幔深部结构、前兆异常时空演化等资料,进一步论证了唐山地震力学成因为岩浆活动的观点。在此基础上对唐山地震前兆机理进行了研究,指出岩浆活动既是该地震发生的成因,也是各类前兆异常的成因,它们是岩浆活动这枚硬币的两面。最后指出只有正确认识地震和前兆的成因,才有可能用前兆资料对地震三要素做出较好的预报。

Abstract:: This paper gives an overview on some main research results obtained in the cause of earthquake mechanics,including the elastic rebound theory,plate tectonics model and earthquakes caused by magmatic activity. By analyzing of the deep crust-mantle structure and the temporal and spatial evolution of precursor anomalies of the Tangshan earthquake zone,we identified that the cause of the Tangshan earthquake mechanics was magmatic activity. Based on this viewpoint,we researched the precursory mechanism of Tangshan earthquake and pointed out that the magmatic activity was both the cause of earthquake occurrence and the cause of various precursory anomalies. They were the two sides of the magma activity. Finally,it was believed that we could use the precursory data to make better predictions for the three elements of the earthquake only by correctly understand the causes of earthquakes and precursors.