摘要
对2006年文安M_(S)5.1地震和2020年古冶M_(S)5.1地震前的异常平静图像、区域-时间-长度(RTL)曲线、地震图像信息(PI)热点进行了对比分析。研究结果表明:①2次M_(S)5.1地震前存在不同程度的时空平静异常图像;②RTL方法显示,文安地震前半年存在显著平静异常,古冶地震前半年内未出现平静异常;③PI方法显示,在3年预测窗长和0.1°×0.1°网格尺度下,2次地震的震中附近皆存在热点,文安地震的有效热点相比于古冶地震对地点指示意义更好,发震风险性更高。该研究对华北地区M_(S)5.0以上地震活动特征总结和地震危险性评估具有一定的参考意义。
The 2006 Wen'an M_(S)5.1 earthquake and the 2020 Guye M_(S)5.1 earthquake were comparatively analyzed by using the abnormal seismic quiescence image,the region-time-length curve method and the hotspots of pattern information method.The results show that:(1)there are different spatio-temporal quiescence patterns before the two M_(S)5.1 earthquakes.(2)the RTL method shows that there is significant seismic quiescence abnormality 6 months before Wen'an earthquake,and not appeared 6 months before Guye earthquake.(3)the PI method shows that under the 3a forecasting window length and 0.1°×0.1°grid size,hotspots were found near the epicenter of both earthquakes.Compared with the Guye earthquake,the effective hotspots of the Wen'an earthquake has indicative significance for epicenter location,and the seismic risk is higher.The above research has certain reference significance for summarizing the seismic activity characteristic and risk assessment of M≥5.0 earthquakes in North China.
作者
宋程
张永仙
夏彩韵
孙路强
SONG Cheng;ZHANG Yongxian;XIA Caiyun;SUN Luqiang(Tianjin Earthquake Agency,Tianjin 300201,China;Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Liaoning Earthquake Agency,Shenyang 110031,China)
出处
《华北地震科学》
2024年第3期83-90,共8页
North China Earthquake Sciences
基金
天津市自然科学基金青年项目(22JCQNJC01070)
天津市地震局科研项目(Zd202402,Zd202304)。
