Modelado sísmico de la cuenca de la Ciudad de México
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Resumen
Se presentan resultados numéricos de modelado sísmico con diferencias finitas utilizando una formulación de rejilla alternada. Esta permite obtener soluciones estables, precisas y confiables para modelar la cuenca de la Ciudad de México. Las respuestas de modelos geológicos simplificados sugieren que la influencia del subsuelo profundo (hasta 1.5 km) puede ser importante en la evaluación del movimiento del terreno para frecuencias bajas (0.5-1.5 Hz) y que las variaciones espaciales y la larga duración del movimiento del terreno en la Ciudad de México se deben, entre otras posibles causas, a la inducción, debida al efecto de cuenca cerrada, de ondas superficiales propagándose lateralmente y en direcciones opuestas. Algunas incertidumbres seguramente se resolverán al conocer mejor la estructura del subsuelo y el campo sísmico incidente, al mejorar nuestra habilidad para modelar la estructura y al estudiar los grandes desplazamientos horizontales del movimiento del terreno observados en registros de aceleración.
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