Source Mechanism of Volcanic Explosions Investigated by Seismo-Acoustic Observations ...

• Main Author: Kim, Keehoon
• Format: Thesis
• Language: English
• Published: University of North Carolina at Chapel Hill 2013
• Subjects: Kamchatka
• Online Access: https://dx.doi.org/10.17615/dt9x-6e19; https://cdr.lib.unc.edu/concern/dissertations/z603qx884?locale=en

Source mechanisms of explosive, volcanic eruptions are critical for understanding magmatic plumbing systems, determining the evolution and geometry of source regions, and assessing eruptive behavior as well as hazard impact. In the last two decades, volcano seismo-infrasonic observations have become an essential part of volcano monitoring systems. Because the open vent of a volcano is a corridor connecting the solid earth to the atmosphere, explosive eruptions efficiently excite both infrasound and seismic waves. Each of these mechanical waves includes characteristic information on several stages of the eruption process, and the coupling of these processes sheds considerable light into volcano dynamics. In this dissertation, details of the explosive eruption mechanism are investigated by seismo-acoustic observations at two volcanoes: Karymsky Volcano in Kamchatka, Russia, and Tungurahua Volcano, Ecuador. First, path effects of infrasound waves near volcanic craters are investigated as they pass the rim of ...