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Crustal Velocity Models Retrieved from Surface Wave Dispersion Data for Gujarat Region, Western Peninsular India
Modelos de velocidad cortical obtenidos de la información de ondas de dispersión superficiales en la región de Gujarat, en el occidente peninsular de la India
DOI:
https://doi.org/10.15446/esrj.v23n2.58570Keywords:
Crustal Structure, Gujarat region, Surface wave, Dispersion, Genetic Algorithm (en)estructura de la corteza, region Gujarat, onda superficial, dispersión, algoritmo genético (es)
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The physiographic features of Gujarat state of western India are unique, as they behaved dynamically with several alterations and modifications throughout the geological timescale. It displays a remarkable example of a terrain bestowed with geological, physiographical and climatic diversities. The massive 2001 Bhuj earthquake (M 7.7) over the Kachchh region caused severe damage and devastation to the state of Gujarat and attracted the scientific community of the world to comprehend on its structure and tectonics for future hazard reduction. In the present study, three clusters of wave paths A, B1, and B2 have considered. In each cluster, dispersion data were measured station by station which collectively formed a dispersion data file for a nonlinear inversion through Genetic algorithm. In this way, three crustal velocity models were generated for entire Gujarat. These models are 1) Across Cambay Basin (Path A), 2) Along Saurashtra - Kathiawar Horst (Path B1) and 3) Along Narmada Basin (Path B2), which were formed at different times during the Mesozoic. The average thickness of the crust estimated in the present study for paths A, B1 and B2 are 38.2 km, 36.2 km, and 41.6 km respectively and the estimated S-wave velocity in the lower crust is ~ 3.9 km/s for all the paths. The present study will improve our knowledge about the structure of the seismogenic layer of this active intraplate region
Las características fisiográficas del estado occidental de la India son únicas, ya que ellas actúan dinámicamente con varias alteraciones y modificaciones a través de la escala de tiempo geológica. Estas características son el ejemplo de un terreno con diversidades climáticas, fisiográficas y geológicas. El terremoto de Bhuj en 2001 (de magnitud 7.7.) en el distrito de Kutch causó varios daños y devastación al estado de Gujarat, al tiempo que atrajo a la comunidad científica del mundo para estudiar su estructura y tectónica con el fin de reducir futuros peligros. En el estudio presente se consideraron tres grupos de trayectorias de ondas, A, B1 y B2. En cada grupo la información de dispersión se midió estación por estación y el conjunto de datos de dispersión recolectados permitió una inversión no lineal a través de un algoritmo genético. De esta forma, tres modelos de velocidad cortical se generaron para todo Gujarat. Estos modelos son: 1. A lo largo de la cuenca Cambay (Trayecto A). 2. A lo largo de Saurashtra - Kathiawar Horst (Trayecto B1). 3. A lo largo de la cuenca Narmada (Trayecto 2), los cuales se formaron en momentos diferentes durante el Mesozoico. El promedio del grosor de la capa estimado en este estudio para las trayectorias A, B1, y B2 es de 38,2 km, 36,2 km y 46,1 km respectivamente, y la velocidad de la onda S en la parte baja de la capa es de ~ 3.9 km/s para todas las trayectorias. Este trabajo debe contribuir el conocimiento acerca de la estructura de la capa sismogénica de esta activa región que yace entre placas.
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