委内瑞拉周三发生了两次芮氏规模分别为 7.2 和 7.5 的强烈地震,两起地震仅相隔 39 秒。这种现象被称为「双震」(seismic doublet),属于非常罕见的地震活动,震央位于尤马雷市西北部,导致委内瑞拉北部及多个加勒比海国家均有明显震感。
专家指出,这次双震可能是在南美与加勒比海板块边界的平移断层上发生的。第一起地震引起的断层破裂将应力转移到了相邻的断层,迅速触发了第二起地震。由于这类平移型地震通常发生在较浅的深度,释放的能量传播距离较短,因而对地面建筑和人口密集区造成了更严重的破坏。
官方报告指出,此次双震已造成至少 164 人死亡、近千人受伤,而美国地质调查局(USGS)预估最终伤亡人数可能因建筑物抗震力不足及人口稠密等因素将大幅上升。专家也警告,卡拉卡斯地区未来仍面临发生强烈余震的风险。
Venezuela was struck by two powerful earthquakes of magnitude 7.2 and 7.5 on Wednesday, occurring just 39 seconds apart. This rare phenomenon, known as a seismic doublet, had its epicenters northwest of Yumare and was felt across much of northern Venezuela and several Caribbean nations.
Experts believe the doublet occurred along the strike-slip fault at the boundary of the South American and Caribbean plates. The first rupture transferred stress to a nearby fault, rapidly triggering the second shallow earthquake, which released destructive energy close to populated areas.
Official reports state that the double earthquakes have claimed at least 164 lives and injured nearly 1,000 people, with final casualties potentially reaching tens of thousands. Experts warn that the Caracas region faces a high risk of powerful aftershocks due to accumulated tectonic stress.