Impending eruption? At 3:27 and 4:51 in the N.E. Part of spokane there was heard sub sonic blasts combined with crust cracking and directly above thunder associated with the under ground earth’s crust collapse. Local news what does it mean? 1st question. If the news personal miss they get burnt alive in the earth collapse and hot spot. There is a international set of criteria listed in the U,S,G.S. site for the hazard level of eruptions its woe full.