Estimating the Attenuation of Seismic Wave Energy at Short Distances from Kizimen Volcano, Kamchatka

Abstract

A swarm of volcanic earthquakes that occurred during an eruption of Kizimen Volcano provided an opportunity to study the attenuation of seismic wave energy in volcanogenic rocks at short hypocentral distances from the volcano. The study is based on P and S waves, as well as coda waves, using frequency dependent and frequency independent methods: pulse broadening, code normalization, and the model of single backscattering of coda waves. It is possible that further studies along these lines would also yield results for stress and strain in volcanogenic rocks beneath the volcano and in its cone. The determination of intrinsic absorption and scattering of seismic waves showed that the total attenuation within the volcanic edifice is dominated by shear wave scattering compared with intrinsic energy absorption. The conclusion is that the Q of the Kizimen volcanogenic rocks is higher than that of tectonic media.