Searching for correlations between variations of spectral and dynamical parameters and changes in seismic activity of Copahue volcano during the eruption of December 22, 2012

FERNANDEZ MELCHOR I; MONTENEGRO V.; ALMENDROS J.; - CASELLI, A.T.

PUERTO VARAS

Congreso; CITIES ON VOLCANOES 9; 2016

SERNAGEOMIN

AlthoughtheCopahue volcano (Chile-Argentinaborder)is oneofthemost activeinthe southern Andes(37◦85?S,71◦15?W;2997m),its seismicactivity literature is not abundant. During the last 250 years this volcanohasexperiencedat least12lowintensityphreaticand phreatomagmatic?magmatic eruption. The last one occurred on 22nd December 2012 (VEI2)vaporizingthecraterlake watersandthehydrothermalsysteminafewminutes.Athreecomponentshort?period seismic station locatedat9kmofthecrater recorded the seismic activity.These seismic signals can provide in¬formationon movementsofmagma insidethe lithosphere.Particularly,wewill focus on seismic noise and volcanic tremor becausethey can capturerapid dynamical changes in near real time. Hence, we are analyzing thevariationsofamplitude,andspectralanddynamicalparametersofthe wholetremorsignal recordedbefore,duringand after strombolian-eruptionofCo¬pahue