摘要
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 earthquake Cases in China and relative literature data,by collecting fluid anomalous information before moderate-strong earthquakes in Liaoning and surrounding area,we analyzed anomalous fluid characteristics before the moderate earthquakes,and set up a fluid index system for Liaoning area.The analysis shows that the precursory anomaly of M≥7earthquakes have characteristics of spatial distribution,multi-abnormalities number,long duration,large varied amplitude and synchronously.The earthquakes mainly occurred with sudden jump and increases of anomalous fluid,and usually in the transition time of decreased anomalous frequency.At the same time,the number of the macroscopic anomaly can reached thousands of times,and have significant characteristics of spatial distribution.The precursory anomalies of earthquakes with M5-6are mainly concentrated in the range of 200 km,and have relatively short duration.Besides,the water radon anomalies take an important role in anomalous fluid.M5-6as well as M≥7.0,usually happened 1-2month after the transition decreases of anomalous frequency,and there is less or no macroscopic anomalies for M5-6earthquakes.
出处
《地震》
CSCD
北大核心
2016年第4期131-143,共13页
Earthquake
基金
中国地震局震情跟踪定向任务(2015020505)资助
