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Source Model of the October 9, 1995 Jalisco-Colima Tsunami as constrained by field survey reports, and on the numerical simulation of the tsunami

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      Abstract

      A model of the seismic source of the October 9, 1995 Jalisco-Colima tsunami is obtained using the numerical modeling of the tsunami as constrained by field survey reports of tsunami run-up and the extent of flooding, by considering an earthquake (Mw∼8.0) with rupture area A = 9000 km2, L = 150 km, W = 60 km, with two different coseismic dislocation patches: 1 m the dislocation of the first 60 km along the fault plane starting from its NW edge, offshore Chalacatepec and Chamela, and 3 m the dislocation of the next 90 km; offshore Tenacatita, Navidad and Manzanillo. As expected, the seismic source obtained in this study is a simplified model in comparison of the seismic source obtained by inverting seismic and GPS data. However, the fact that this simplified model reproduces adequately the location of the rupture area and its coseismic dislocation is still important in order to provide some degree of certainty for the tsunami source of those historical tsunamis for which no seismic nor tide records are available, and only testimonies and vague relates of its effects are documented.

      Translated abstract

      En este trabajo se modela la fuente sísmica del tsunami de Jalisco-Colima del 9 de octubre de 1995 ajustando los resultados del modelo numérico del tsunami para reproducir adecuadamente las alturas de inundación del tsunami documentadas in situ durante los trabajos de reconocimiento del área afectada por el tsunami. La fuente sísmica corresponde a un sismo de magnitud Mw∼8.0 con un área de ruptura A = 9000 km2, L = 150 km, W = 60 km, con dislocación cosísmica heterogénea: dislocación de 1 m en los primeros 60 km a lo largo del plano de falla iniciando en el extremo NW, mar adentro frente a Chalacatepec y Chamela, y dislocación de 3 m en los restantes 90 km, mar adentro frente a Tenacatita, Navidad y Manzanillo. Como se esperaba, la fuente sísmica obtenida en este estudio es un modelo simplificado en comparación con la obtenida invirtiendo datos sísmicos y de GPS. Sin embargo, el hecho de que este modelo simplificado reproduzca aproximadamente la dislocación cosísmica y el área de ruptura y su localización, es importante para validar la fuente sísmica de aquellos tsunamis históricos de los que únicamente se cuenta con algunos testimonios y relatos vagos de sus efectos y de los cuales no existen registros sísmicos ni del nivel del mar.

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      Most cited references 26

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      Global Sea Floor Topography from Satellite Altimetry and Ship Depth Soundings

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        Geophysical Fluid Dynamics

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          The 1995 Colima-Jalisco, Mexico, earthquake (Mw = 8): a study of the rupture process

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            Author and article information

            Affiliations
            [1 ] Universidad de Guadalajara Mexico
            [2 ] Centro de Investigación Científica y de Educación Superior de Ensenada MX
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Journal
            geoint
            Geofísica internacional
            Geofís. Intl
            Instituto de Geofísica, UNAM (México )
            0016-7169
            June 2015
            : 54
            : 2
            : 149-159
            S0016-71692015000200149
            10.1016/j.gi.2015.04.010

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Mexico
            Categories
            Geochemistry & Geophysics

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