Browsing by Author "Havskov, J"

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    Tsunamis and Tsunami Hazards in Central America
    (Natural Hazards, 2000) Fernández-Arce, M; Molina, E; Havskov, J; Atakan, K
    A tsunami catalogue for Central America is compiled containing 49 tsunamis for the period 1539–1996, thirty seven of them are in the Pacific and twelve in the Caribbean. The number of known tsunamis increased dramatically after the middle of the nineteenth century, since 43 events occurred between 1850 and 1996. This is probably a consequence of the lack of population living near the coast in earlier times. The preliminary regionalization of the earthquakes sources related to reported tsunamis shows that, in the Pacific, most events were generated by the Cocos-Caribbean Subduction Zone (CO-CA). At the Caribbean side, 5 events are related with the North American-Caribbean Plate Boundary (NA-CA) and 7 with the North Panama Deformed Belt (NPDB). There are ten local tsunamis with a specific damage report, seven in the Pacific and the rest in the Caribbean. The total number of casualties due to local tsunamis is less than 455 but this number could be higher. The damages reported range from coastal and ship damage to destruction of small towns, and there does not exist a quantification of them. A preliminary empirical estimation of tsunami hazard indicates that 43% of the large earthquakes (Ms > 7.0) along the Pacific Coast of Central America and 100% along the Caribbean, generate tsunamis. On the Pacific, the Guatemala–Nicaragua coastal segment has a 32% probability of generating tsunamis after large earthquakes while the probability is 67% for the Costa Rica–Panama segment. Sixty population centers on the Pacific Coast and 44 on the Caribbean are exposed to the impact of tsunamis. This estimation also suggests that areas with higher tsunami potential in the Pacific are the coasts from Nicaragua to Guatemala and Central Costa Rica; on the Caribbean side, Golfo de Honduras Zone and the coasts of Panama and Costa Rica have major hazard. Earthquakes of magnitude larger than 7 with epicenters offshore or onshore (close to the coastline) could trigger tsunamis that would impact those zones.