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何谓地震预警?据悉,日本岩手·宫城内陆发生地震时,日本地震预警系统再次发挥作用。而中国也在首都圈和兰州地区率先建立起类似的地震预警系统。所谓地震预警,是指地震发生后,利用地震波传播速度小于电波传播速度的特点,提前对地震波尚未到达地进行预警。一般来说,地震波的传播速度是每秒几公里,而电波的速度为每秒30万公里。因此,如果能够利用实时监测台网获取的地震信息,以及对地震可能的破坏范围和程度的快速评估结果,就有利用破坏性地震波到达之前的短暂时间发出预警。
What is Earthquake Warning? It is reported that Japan’s Iwate · Miyagi inland earthquakes, the Japanese earthquake early warning system once again play a role. And China also took the lead in setting up a similar earthquake early warning system in the metropolitan area and Lanzhou. The so-called earthquake early warning refers to the earthquake occurred, the use of seismic wave propagation speed is less than the characteristics of radio wave speed, early warning of the earthquake has not yet arrived. In general, seismic waves travel at speeds of a few kilometers per second and radio waves at a rate of 300,000 kilometers per second. Therefore, early warning can be given if the seismic information obtained from the real-time monitoring network and the rapid assessment of the extent and extent of possible damage to the earthquake are utilized.