Abstract
The Las Tres Vírgenes volcanic field (Baja California Sur, Mexico) hosts one of the five active geothermal power plants operating in Mexico. The volcanic system is considered still active and has been extensively studied during and after the development of the geothermal activities. However the volumes and locations of the magmatic sources, as well as the size of the geothermal reservoir are still poorly known. In this work we use the records of 177 local earthquakes recorded in 2012 by a temporary local seismic network to characterize compressional (Vp) and shear (Vs) wave seismic velocities of the volcanic system from the surface down to 8–10 km of depth. We applied the Enhanced Seismic Tomography method, which incorporates the Double Difference tomography and the post processing Weighted Average Method. Results describe for the first time that the magmatic source reaches at least 4–5 km of depth beneath La Virgen Volcano, feeding a widespread reservoir confined in the first 2–3 km of depth, which is much larger than the currently exploited region.
Published Version
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