tsunami 海啸natural disaster 自然灾害tidal waves 潮汐波,浪潮epicenter 震中temblor 地震aftershock 余震magnitude 震级tragedy 灾难wreckage 残骸death toll 死亡人数survivors 幸存者victims 受灾者tsunami warning system 海啸预警系统earthquake monitoring 地震监控international contributions 国际援助evacuation team 撤运小组smaller tremors 小震动,小地震