论文部分内容阅读
强震前可能出现地震活动空区是最早被人们注意到的震兆之一,也是近年来比较受重视的一种震前地震活动图象变化。虽然有关空区的震例报导逐渐增多,但是人们还是普遍认为要在大震前很确切地圈出一个空区很不容易;震后总结,不同人划的空区也不大一样。原因之一,是空区起止时间很难确定。有人取一定时间间隔(如2个月)为步长、对一定时段(如1年或2年)作震中分布图,以便客观寻找空区。可是,实际上我们取
It is one of the earliest earthquakes that people noticed before the strong earthquakes. It is also a kind of seismic image change before earthquakes which has been paid more attention in recent years. Although reports of earthquakes on empty areas have gradually increased, it is generally accepted that it is not easy to circle an empty area exactly before a large earthquake. After the earthquake concluded, the empty areas of different people are not quite the same. One of the reasons is that it is hard to determine the starting and ending time of empty area. Some people take a certain time interval (such as 2 months) for the step, for a certain period of time (such as 1 year or 2 years) for the epicenter map, in order to objectively look for space. However, in fact, we take