Volcano is a sign of God's Heart pierced by a lance and bursting forth with love and life that is uncontainable.
Phase one, humans confuse volcano with God. (Pele, Vulcan etc.)
Phase two, the ten commandments come from the volcano.
Phase three, Elijah hears a still small voice after the eruptions and quakes and hurricanes, and a shower of milk duds blows forth from the plug.
The last part of the last sentence is apocryphal, provenance unknown.
Frassati loved to hike the mountains and studied mining and engineering. this could be why he wanted the name Valanga to be more widely known.
Sample Volcano textbook
Hungarian Text of field studies