Determining volcanic deformation at San Miguel volcano, El Salvador by integrating radar interferometry and seismic analyses.
Autor:
Schiek, Cara Gina.
Fuente:
El Paso; The University of Texas at El Paso; nov. 2008. 39 p. ilus, mapas, tab, graf.
Descriptores:
GEOLOGIA. VULCANOLOGIA. MEDICION SISMICA. AMENAZA. SISTEMAS DE ALERTA TEMPRANA --------------------------------------------------------------------------------
Resumen:
From the early 1500īs to the present day, San Miguel volcano has experienced at least 25 small eruptions making it one of the most active volcanoes in the El Salvadoran volcanic chain. We conduct an integrated geophysical study to determine which areas around the volcano are undergoing deformation that could lead volcanic hazards such as slope failure or lava flows. We synthesize results from radar interferometry and seismic data from a temporary, six-station, broadband network deployed around San Miguel volcano (figure 4.1). The seismic network recorded continuosly during approximately the same time, from March 2007 to January 2008. Using the seismic data and forward modeling, we developed synthetic interferograms that were compared to observed interferograms in order to show the interaction between subsurface deformation and surface deformation. We conclude that the volcanism at San Miguel is driven by tensile forces occurring perpendicular to the San Miguel Fracture Zone. The SMFZ is the location for upwelling of volcanic material. This material is either released through the SMFZ or is stored in the southwestern slope of the volcano (Au) - en
