【摘要】 共振是一种普遍现象 ,在地震事件中也存在 .当一个大震爆发时 ,其地震波将引起一个已到了孕震晚期的震源体共振 .地震波被吸收的能量一般并不多 ,但却可以作为孕震进程的一种标志 ,即预警信号 .发出信号的大震称为预警地震 .地震波是各向异性的 ,在地震带、纬度和经度的方向占有优势 .一些毁城巨震 ,如唐山 7.8级、海原 8.5级和日本关东8.2级等地震 ,原来都存在着预警地震 .预警地震的存在对可能发生大震地区的防震起到很重要的参考作用更多还原

【Abstract】 Resonance is a general phenomenon as well as in earthquakes. When a large shock bursts its wave will cause resonance of an earthquake source being pregnant with a shock at later stage. Energy absorbed from earthquake wave is not so much, but the wave can be a sign of earthquake pregnanting progress. That is an alarm signal. The large shock sending signals is called alarm earthquake. The earthquake wave are anisotropy, and the earthquake belt, latitude and longitude are superior in intensities to other directions. There were pre alarm earthquakes in some big earthquakes that damaged cities, such as the earthquake of magnitude 7 8 in Tangshan,the earthquake of magnitude 8 5 in Haiyuan and the earthquake of magnitude 8 2 in Japan Guandong. The pre alarm earthquakes can play an important part in quakeproof in the regions where big earthquakes maybe take place.更多还原