摘要
基于中国震例及相关文献资料,通过收集辽宁及周边地区中强地震震前形变前兆异常信息,对震前形变异常特征进行分析研究。分析表明,辽宁地区中强地震前形变前兆异常具有分布范围广、异常数量多、持续时间长、异常变化幅度大且具有同步性变化特征等特点;形变异常的主要发震特征为破年变异常,异常具体体现为趋势转向、短期加速等动态特征;异常主要集中在300km范围内;异常主要以倾斜和应变为主;持续时间以中长期异常为主,出现时间同步性较好。
Based on the earthquake cases in China and related documents, we collect the information of the deformation precursor anomaly features before moderate-strong earthquakes in Liaoning and its neighbor areas, this paper analyzed the precursor anomaly features before earthquakes and built the index system of the deformation precursor subject. It shows that the deformation precursor anomalies of M ≥ 5.0 earthquakes have the features of wide distribution numerous anomalies, lasting longer, large amplitude of anomaly variation, synchronism and so on. The mainly feature of the earthquake-triggering deformation anomaly is broken annual variation abnormality , it＇s embodied in many dynamic features such as trend change and short-term acceleration; The anomaly is mainly focused on the range of 300km or so; The Anomaly is mainly composed of tilt and strain; The duration is most of the medium to long term anomalies, and the time synchronization is better.
出处
《防灾减灾学报》
2016年第4期18-24,共7页
Journal of Disaster Prevention And Reduction
关键词
形变
震例
异常特征
辽宁地区
deformation
earthquake cases
anomaly features
index system
