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Abstract:
During July 10th and 11th, 2015, Volcán de Colima experienced the most intense volcanic eruption since its Sub-Plinian explosion that occurred in 1913. During this phase, pyroclastic density currents were generated, reaching up to 10.3 km south of the volcano. Starting in January 2015, there was a significant increase in the occurrence of tremor signals including harmonic, monochromatic, broad-spectrum, spasmodic and banded tremor, as well as tremor composed of LPs and tremor accompanying Vulcanian explosions. In this study, we quantified the different types of tremor observed and correlated their occurrence throughout the various eruptive phases presented within the period December 2014 to August 2015. We also characterized the evolution of these tremors, determining their fundamental frequencies, overtones, spectral range, amplitudes, and patterns in the frequency gliding. This allows for a better understanding of the changes presented in the precursory, eruptive and post-eruptive seismicity related to the constant activity of the volcano during the period under study. Finally, we evaluated possible models that could explain the generation of the tremor signals recorded during the analyzed period.
