Yellowstone eruption blasts debris into sky near Old Faithful geyser BBC.comSurprise Yellowstone geyser eruption highlights little known hazard at popular park NBC MontanaA baffling, dangerous explosion in Yellowstone: What is a hydrothermal explosion? USA TODAYHydrothermal Explosion at Yellowstone Damages Boardwalk, Sends Visitors Running: ‘Unbelievable’ PEOPLE‘Hydrothermal explosion’ propels debris 100 feet into the air at national park The Denver Gazette