Earthquake-Induced Helmholz Resonance in Manzanillo Lagoon, Mexico

N. Carbajal, M. A

Abstract


On 9th October, 1995, at 9:36 local time, an earthquake of magnitude 8.0 occurred on the west coast of Mexico. The epicenter was located at 18$^{\circ}$ 51.5' N and 104$^{\circ}$ 8.4' W, at approximately 25 km of Manzanillo. This important commercial harbor is connected by a narrow channel to a lagoon. A tidal gauge recorded the forced oscillations occurred in the lagoon. A dominant period of 36 minutes was observed. Analytical solutions for ideal rectangular flat basins and numerical modeling for realistic geometries show that the lagoon and the channel produce a Helmholz resonance with a period similar to that observed in the earthquake.

Keywords


Tsunamis; resonance; numerical modeling; coastal oceanography

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Revista Mexicana de Física

ISSN: 2683-2224 (on line), 0035-001X (print)

Bimonthly publication of Sociedad Mexicana de Física, A.C.
Departamento de Física, 2o. Piso, Facultad de Ciencias, UNAM.
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