摘要
本文介绍了1989年10月18日大同—阳高震群前的地震活动背景及异常现象,前兆观测异常现象及其时、空、强特征。根据本次震群活动前异常现象特征给出了具体的中、短、临阶段的时间划分、地震活动与前兆观测两类异常现象之间的关联。并提出了地震孕育的短临阶段在地震预报中的关键作用。短期阶段承前启后,信息丰富且分布范围广,延续时间比临震阶段长。文中分析了异常现象的特征,特别是空间分布图象,应用板内动力学立交模型,综合解释了震前几年间出现的一系列异常现象。
This paper summarizes the seismic activity background and seismic anomalies, abnomal phenomena of precusory observations and their time-space-magnitude characteristics before the Datong-Yanggao earthquake swarm on October 18, 1989. Authors here presented the concrete time division of mid-range, short and impending stages and the link between both anomalous phenomena of seismic activities and precursory observations. The key role of short-impending stage of earthquake preparedness in earthquake prediction is emphasized. The short-period stage which has abundent information and wide-spread distribution formed a connecting link between the preceeding and the following, and lasted a longer time than the impending stage. Authors analyzed the characteristics of anomalous phenomena, especially the time-space distribution pattern and put forward a gallop model of intraplate dynamics with regional features, and synthetically explained a series of abnormal phenomena occurring several years before the earthquake swarm.
出处
《地震》
CSCD
北大核心
1990年第4期45-57,共13页
Earthquake
