地震蕴育与发生过程中场与源的关系
RELATIONSHIP BETWEEN THE REGIONAL STRESS FIELDS AND SOURCES IN THE PREPARATION PROCESS AND OCCURRENCE OF LARGE EARTHQUAKES
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摘要: 地震前兆和后效的力学现象可归结为区域应力场和震源应力场的相互作用问题。研究源对场的反馈作用,可能是建立大范围地震前兆和后效模式的重要课题之一。#br#本文首先由大地震前后的地震活动及前兆资料,归纳出地震蕴育和发生时,源对场影响的事实与特点,并利用非线性有限元计算结果,指出源对场影响的基本特征及影响范围,解释了华北近期三次大震的蕴育与发生对京津地区的综合影响及某些地震前兆与后效现象。Abstract: Mechanical phenomena of the precursors and aftereffect of large earthquakes can be induced to the interaction of the regional stress field and sourc es.Studing freedback action of sources on the field might be important to propose the model for the precursors and aftereffect of earthquakes in large scale.#br#Based on the seismicity and observation data before and after great earthquakes, the facts and features of influence of sources on the field have been summerized.According to calculated results of the non-linear finite element method, the range and main features of the influence have been obtained.Some of precursors and aftereffect phenomena in recent three large earthquakes occurred in North China have been preliminaryly interpreted.
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[1] 陈章立等,大震前区域地震活动性待征,国际地震预报讨论会论文选,丁国瑜、马宗晋编.地震出版社,1981。 [2] 傅征祥,大震前区域地震活动迁移,地球物理学报,25, 6, 1982。 [3] 马宗晋等,1966-1976年中国九次大地震,地震出版社,1982。 [4] 汪成民等,唐山地震前后深井水位变化特征,国际地震预报讨论会论文选,地震出版社,1981。 [5] 王仁等,华北地区地震迁移规律的数学模拟,地震学报,2. 1980。 [6] 梅世蓉等,1976年唐山地震,地震出版社,1982。 -

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