ABSTRACT In 2018, a large earthquake (Mw7.6) occurred in the Swan Island Fault zone at the northwest boundary of the Caribbean plate. This earthquake generated a small tsunami of 20 cm. However, Puerto Cortes in Honduras is located close to the Swan Island Fault zone. Evaluation of tsunami hazard at Puerto Cortes due to large earthquakes along the fault zone is important. We first estimated the fault parameters of the 2018 Swan Island earthquake using W-phase inversion technique. Then, the moment magnitude of 7.6, the fault length of 134 km, the fault width of 24 km, and the slip amount of 5.1 m were estimated. In addition to those estimates, a small fault dimension of the earthquake, 40 km × 20 km, with a slip amount of 20.8 m was considered. Those two fault models were used to compute tsunami inundation at Puerto Cortes. The tsunami computed from the small fault inundated a large area in Puerto Cortes including the port area. The effect of co-seismic horizontal displacement of ocean floor also enhanced the tsunami inundation at Puerto Cortes. Those results indicate that preparation for future tsunami hazard in Puerto Cortes is important although no significant tsunami was generated historically.

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洪都拉斯加勒比海沿岸加勒比板块西北边界开曼海槽发生大地震引发海啸灾害

摘要 2018年，加勒比板块西北边界的天鹅岛断裂带发生了一次大地震（Mw7.6）。这次地震引发了20厘米的小海啸。然而，洪都拉斯的科尔特斯港靠近天鹅岛断层带。由于沿断层带发生大地震，对科尔特斯港的海啸灾害进行评估很重要。我们首先使用 W 相反演技术估计了 2018 年天鹅岛地震的断层参数。然后，估计矩震级为 7.6，断层长 134 km，断层宽 24 km，滑移量 5.1 m。除了这些估计之外，还考虑了地震的小断层尺寸，40 km × 20 km，滑动量为 20.8 m。这两个断层模型用于计算科尔特斯港的海啸淹没情况。根据小断层计算的海啸淹没了科尔特斯港的大片区域，包括港口区。洋底同震水平位移的影响也加剧了科尔特斯港的海啸淹没。这些结果表明，尽管历史上没有发生过重大海啸，但为科尔特斯港未来的海啸灾害做好准备很重要。