Identification of changes in the activity of Kambalny volcano (South Kamchatka) based on correlation of seismic noise

Abstract

Using experimental data obtained from the network of stations installed on Kambalny volcano in the period from July 2018 to July 2019, a set of correlation functions was obtained and its preliminary interpretation was carried out. Works aimed at quality control of the obtained cross-correlation functions have been performed. We have identified considerable variations of the frequency-amplitude characteristics of the cross-correlation functions at small times, as well as significant shifts of the derived phases in large correlation times. Such variations of the cross-correlation patterns may indicate the existence of distinct time periods with different types of seismicity, as well as strong variations of mechanical properties of rocks. In turn, this might be an evidence for the ongoing activity of the magmatic system beneath the Kambalny volcano.