岩石破裂强度变化对孕震系统地震活动影响的动力学模型研究  

DYNAMIC MODEL FOR STUDYING THE VARIATION OF ROCK FRACTURE STRENGTH HOW TO AFFECT THE SEISMICITY OF SEISMOGENIC SYSTEM

作　　者：李丽[1] 张国民[1] 石耀霖[2] 

机构地区：[1]国家地震局分析预报中心,北京100036 [2]中国科学院研究生院,北京100039

出　　处：《内陆地震》1998年第1期29-35,共7页Inland Earthquake

摘　　要：以构造块体成组孕震模型为基础，讨论了孕震系统在局部孕震体强度发生变化时整个系统中的地震活动性变化特征。分析了岩石介质强度在其正常背景下发生弱化和强化后，孕震系统中各地震带上地震活动的时、空、强分布特征。结果表明，在外界影响（即边界动力作用）不变的情况下，不论是系统局部发生弱化还是强化，强度变化不仅影响到发生变化的地区中的地震活动性。Seismogenic system's seismicity characteristics when the strength of partial seismogenic body in the system varies are discussed on the basis of the grouped seismogenic model of tectonic block. The time, space,and intensity distribution characteristics of seismicity on every seismic belt in the system are analysed after the strength of rock medium is strengthened and weakened under normal background. The result shows that when outside effect (dynamic action at boundary) keep steady, any strength variation in a part of the system, whether strengthened or weakened, strongly affects the seismicity in not only the areas with variation but also its neighbouring area and the seismic belts without variation in the system.

关 键 词：地震活动性 破裂强度 岩石 动力学模型 孕震 

分 类 号：P315.5[天文地球—地震学] P315.1[天文地球—固体地球物理学]