论文部分内容阅读
主要基于中国震例及相关文献资料,通过收集辽宁及周边历史中强地震震前辽宁地区流体前兆异常信息,对震前流体异常特征进行了分析总结,建立辽宁地区流体前兆预测指标。研究表明,辽宁地区M≥7地震流体前兆异常具有分布范围广,异常数量多,持续时间长,异常变化幅度大且准同步变化等特征,地震前兆主要以突跳型、上升型异常为主,地震一般发生在异常最高频次开始转折降低阶段,宏观异常数量多达千起,空间分布特征明显;M5~6地震异常主要集中在距震中200km范围内,异常持续时间相对较短,主要以水氡为主,地震前兆特征主要以突跳型、上升型异常为主,且地震一般在异常最高频次开始转折后2月内发生,宏观异常数量少,一般仅为10多起或无宏观异常。
Based on the Chinese earthquake cases and related literature, this paper collected fluid precursory anomalies in Liaoning Province before and during the previous strong earthquake in Liaoning Province and surrounding areas, and analyzed and summarized the anomalous fluid anomalies before the earthquake so as to establish the prediction index of fluid precursors in Liaoning Province. The results show that the precursory anomalies of M ≥ 7 earthquakes in Liaoning Province are characterized by a wide range of distributions, a large number of anomalies, long durations, large anomalous changes and quasi-synchronous changes. The precursors of the earthquakes are dominated by sudden jumps and rising anomalies, The earthquakes usually occurred at the stage of the turning-reduction of the anomalous uppermost frequency, and there were thousands of macro-anomalies with obvious spatial distribution. The anomalies of M5-M6 mainly concentrated within 200km from the epicenter with a relatively short duration of anomalies, The main features of the earthquake precursors are mainly sudden jump and ascending anomalies, and the earthquakes usually occur within 2 months after the onset of the highest anomalous frequency. The number of macro anomalies is small, usually only about 10 or without macro anomalies.