海啸是如何形成的?预警分几级?如何避险?一文读懂!|欧美精品99无码一区二区
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央视网消息:海啸是如何形成的,海啸预警分几级,一起来了解。
海啸是一种具有强大破坏力的海浪,由风暴或海底地震造成,并伴随巨响。海啸通常由震源在海底下50千米以内、里氏地震规模6.5以上的海底地震引起。海啸的特征之一是速度快,在海洋的传播速度大约每小时五百到一千公里,而相邻两个浪头的距离也可能远达500到650千米。地震发生的地方海水越深,因海底变动而涌动的水量越多,形成海啸之后在海面移动的速度也越快。海啸破坏力强,给人类带来的灾难是巨大的。因此,相关部门会视情况提前发布海啸预警信息,提醒人们注意防范。
自然资源部海啸预警中心预报员 侯京明:海啸的预警分为红橙黄三级,(海啸波幅)三米以上是红色预警,(海啸波幅)一到三米是橙色预警,(海啸波幅)30厘米到一米是黄色预警。
海啸来了如何防范
海啸波及范围广,破坏性强,海啸来了应当如何防范,继续来了解。
海啸来临前,所有人员应远离沙滩及沿岸低洼地区。如自己身处海滩,感到地面有强烈震动、发现海水突然退却或听到像即将来临的火车一样的咆哮声,这是海啸来临前的征兆,应立刻跑往高处或稳固建筑物的高层。
海啸的破坏力与沿岸地形有很大关系,遇到一些坡度比较大的地区或是“U型”港湾,就有可能引起波幅的增大,导致灾害发生。即使小的海啸也不能掉以轻心,应当一直待在安全区域内,直到有关职能机构发布解除警报的信号为止。
人员及时避险的同时,在深水区的船只切勿驶向沿岸或浅水区。因为海啸在深水区时,波高很小,不具破坏力。同时,在港口的船只不要冒险试图将小船开到深水区。船上人员应立即离开船只并迅速跑往高处。
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