Analysis of Magma Injections Beneath Mutnovsky Volcano (Kamchatka)

Abstract

For this study we used Frac-Digger program to identify plane-oriented MEQ clusters beneath Mutnovsky volcano. Magma injection events (dykes and sills) are associated with plane-oriented MEQ clusters (2009-2017), most of them are located in NE sector of the volcano (2 x 10 km2) at the elevations from -2.0 to -4.0 km and indicate RF stress conditions beneath Mutnovsky volcano. CFRAC (M. McCluer, R. Horne, 2014) modeling of magma injection into the fracture, characterized by the conditions of Mutnovsky volcano basement (reverse fault, dip angle 30о, sizes 4 х 4 km2, depth – 3 km below sea level) was performed. CFRAC modeling shows that magma injection rate of 2000 kg/s during 1 day may cause: fracture shear displacement up to 10 m and triggering up to several hundreds of earthquakes with magnitudes up to 6.1. Modeling results matches with MEQ magnitudes observed.