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地震和气象专家解析:地震云是否真实存在?哪些天气因素影响震后救援?
目前,从我们监测到的地震情况看,两个地震区都有余震发生。一般来讲余震有一个衰减过程,在这个过程中会产生起伏活动,也会发生一些强余震。由于构造应力、地质条件、孕震环境、震源运动特征等原因,余震序列往往千差万别,余震的震级、次数和持续时间也不同。地震序列总体分为孤立型、主震型和震群型3种。孤立型序列余震少,而且小;主震型序列余震丰富,有的还有前震活动;震群型序列的一般有2个或2个以上的主震,余震序列也比较丰富。目前,地震部门启动了地震现场的加密流动观测,公众可以通过地震部门的官网、地震速报APP、微博、微信等实时关注到余震发生的相关信息。
记者:未来能否实现地震预警?
李山有:地震预警是指在地震发生以后,利用震中地区台站快速判定地震的时间、地点、大小及其影响程度,由于地震波按照每秒数公里速度向外扩散传播,这样,我们就有可能为远离震中但可能遭受地震影响的地区,抢在地震波到达之前,发出一个警报信号,为公众逃生避险、企业紧急处置提供预警时间。
由于方法技术所限,震中地区破坏最严重但没有预警时间,这就是预警盲区;距离震中越远的地区破坏相对较轻但预警时间越长。目前,中国地震局国家地震烈度速报与预警工程计划用三年时间建设由15000余个地震台站组成地震烈度速报与预警系统,实现全国范围的分钟级地震烈度速报,实现华北地区、南北地震带地区、东南沿海地区和新疆天山中段地区的秒级地震预警。
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