墨西哥M_w≥7.2地震的时空对称性特征

Space-time symmetry of M_w≥7. 2 earthquake in Mexico

地震的频繁发生给人类的生命、财产安全造成了巨大的损失,对地震的趋势进行判断,对于提高防御灾害的能力具有十分重要的作用.本文选取了墨西哥M_w≥7.2地震的资料,采用可公度法和对称性原理,运用三元、四元、五元可公度计算来预测墨西哥M_w≥7.2地震信号的强弱,通过蝴蝶结构图和可公度结构系来证明预测结果的可信性,对震中和经纬向的迁移进行分析来判断墨西哥M_w≥7.2地震灾害的空间变化趋势.结果表明:(1)墨西哥M_w≥7.2地震在2015年和2016年信号较强,有可能发生较大震级的地震.(2)该地区地震具有明显的空间对称性,震中的经、纬向迁移呈现出良好的同步性.未来地震很有可能向东南方向迁移,在100.8°W以东,17.6°N以南地区.

The frequent occurrence of earthquakes caused enormous losses to the safety of human life and property. It is very important to improve the ability of disasters prevention through analysis and judgment of earthquake trend. Based on the seismic data（ Mw≥7. 2） in Mexico,the signal intensity of the earthquake disasters here were analyzed and judged by using the methods of commensurability information. The butterfly structure diagram and commensurability structure system to prove the reliability of the forecast result. And we have analyzed the earthquake＇s space-time symmetry and trends by the variation of the longitudinal and latitudinal migration. The results show：（ 1） There is a strong earthquake signal in the 2015 and 2016 year,it is possible there is a greater magnitude earthquake（ Mw≥7. 2）.（ 2） According to the spatial symmetry,we find that the next earthquake may occur in the eastern of 100. 8° W,southern of 17. 6° N.