The great 1787 Mexican tsunami |
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| Authors: | Francisco J Núñez-Cornú Modesto Ortiz John J Sánchez |
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| Institution: | (1) Centro de Sismología y Volcanología de Occidente, Centro Universitario de la Costa, Universidad de Guadalajara, Avenida Universidad 203, C.P. 48280, Puerto Vallarta, JA, Mexico;(2) Dpto. de Oceanografía Física, Centro de Investigación Científica y Educación Superior de Ensenada, Km 107, Cta. Tijuana – Ensenada, Ensenada, BC, 22860, Mexico |
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| Abstract: | Tsunamis have proven to represent a significant hazard around the globe and there is increased awareness about their occurrence.
The Pacific coast in southern México is no exception, because there is firm evidence of the effects of past large tsunamis.
Here we present results from computer-aided modeling of the March 28, 1787-“San Sixto” earthquake and tsunami, and focus on the regions of Acapulco, Corralero, Jamiltepec, and Tehuantepec, located along the
Guerrero-Oaxaca coast. The theoretical waveforms suggest wave heights in excess of 4 m and 18 m at specific locations in Acapulco
and Corralero, respectively, and wave heights of at least 2 m at locations in Jamiltepec and Tehuantepec. From our modeling
results and based on historical documents and the topography of the area, we conclude that these wave heights would have been
sufficient to cause inundations that in the case of Acapulco were restricted to several meters inland, but in other areas
like Corralero reached at least 6 km inland. Our results are consistent with published and unpublished damage reports that
attest to the hazards associated with great earthquakes and tsunamis along the subduction zone in Mexico |
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| Keywords: | Tsunami hazards Historical tsunami Tsunami wave height Tsunami modeling Southern Mexico |
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