Sismo del Quindío del 25 de enero de 1999, evaluación morfotectónica y sismológica
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Universidad Industrial de Santander
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Investigaciones orientadas al entendimiento del comportamiento del sismo del 25 de enero de 1999 y la secuencia de réplicas, a partir de criterios morfotectónicos (índices geomórficos) y sismológicos (análisis espaciotemporal y espectral, cálculo de longitudes de ruptura, mecanismos focales y tensor de esfuerzos), sugieren que el área epicentral del sismo presenta un régimen estructural extensional en los primeros 10 km de profundidad y compresivo entre los 10 y 25 km de profundidad, y que configura una geometría tipo flor negativa. Esta geometría se interpreta como el producto de la tracción lateral de la Falla Ibagué sobre el Sistema de Fallas Romeral, que origina una cuenca de tracción la cual ha sido colmatada por los depósitos del Glacis del Quindío durante los últimos 5 millones de años.
In order to understand the behaviour of the Quindio´s Earthquake 25 January 1999 and its sequence of replicas a morphootectonic (geomorphologic indicators) and seismologic analysis (space-temporal and spectral analysis, ruptura length, focal mechanism solutions and stress tensor) was undertaken. The result suggest that the epicentre area presents an extensional regime down to 10 km depth and compressive between 10 and 25 km depth, forming a negative flower structure. This geometry is interpreted as the result of the lateral traction of the Ibagué Fault over the Romeral Fault System, giving origin to a pull-apart basin in filled by the Glacis del Quindío deposits over the last 5 million years.
In order to understand the behaviour of the Quindio´s Earthquake 25 January 1999 and its sequence of replicas a morphootectonic (geomorphologic indicators) and seismologic analysis (space-temporal and spectral analysis, ruptura length, focal mechanism solutions and stress tensor) was undertaken. The result suggest that the epicentre area presents an extensional regime down to 10 km depth and compressive between 10 and 25 km depth, forming a negative flower structure. This geometry is interpreted as the result of the lateral traction of the Ibagué Fault over the Romeral Fault System, giving origin to a pull-apart basin in filled by the Glacis del Quindío deposits over the last 5 million years.
Keywords
Morphotectonic, Focal Mechanism Solutions, Pull-apart basin, Morfotectónica, mecanismos focales, cuenca de tracción, discusión