Seismicity in colombian llanos foothills: Characterization, relocation and local seismic tomography

Abstract

An earthquake relocation by seismic simultaneous inversion and double differences methods were done in the Colombian Llanos Foothills from 3° to 5°N and from 73° to 75°W. The data used in this work take account 483 earthquakes registered by The Colombia National Seismological Network (RSNC) between 1993 and 2012. For the events relocation the root mean square (RMS) was reduced and several earthquake clusters were identified. The new locations shows principally at southwestern zone are related with the Eastern Frontal Fault System with faults as the Servitá-Santa Maria fault and the Algeciras Fault. In addition this work shows a 3D velocity model indicating an anomaly in the wave behavior related mainly to the low velocity zone under the Eastern Cordillera and minimum variations in average velocity toward southeast zone related with the Amazon Craton. Finally in southwest region where located the faults shows a Vp high velocity anomaly.

Sismicidad antropogénica en los alrededores de algunas represas en Colombia

“…Aunque en investigaciones nacionales (Flórez-Hurtado et al, 2013;Muñoz-Burbano et al, 2015) e internacionales (Haggag et al, 2009;Lizurek et al, 2017;Zhang et al, 2018), se han definido modelos de velocidad con el fin de mejorar la localización (y/o relocalizar) de los eventos sísmicos, el presente trabajo no incorporó este procesamiento, y empleó la información de referencia obtenida mediante consulta a la página web de la RSNC, reconociendo la calidad y limitaciones de los datos.…”