Keywords: Eruption of Mount Pinatubo, June 15, 1991.jpg en View to the west from Clark Air Base of the major eruption of Pinatubo on June 15 1991 The June 15-16 climatic phase lasted more than fifteen hours sent tephra 30-40 km into the atmosphere generated voluminous pyroclastic flows and left a caldera in the former summit region Later dubbed Black Saturday the day of darkness stretched for 36 hours The day included a black blizzard of coarse sand more than 50 earthquakes volcanic thunder brilliant lightning and orange fireballs http //www ngdc noaa gov/hazardimages/picture/show/687 NOAA/NGDC R Lapointe U S Air Force 1991-06-15 1991 eruption of Mount Pinatubo Files uploaded by Yann Forget Eruption columns PD-USGov |