Keywords: Pinatubo91marella valley ash plume.jpg The June 29 1991 eruption column from Mount Pinatubo with Marella River Valley Aerial view to north of pyroclastic-flow deposits in Marella River valley in foreground and tributaries of Balin Buquero River in distance with ash plume rising from Pinatubo�s caldera Pyroclastic-flow deposits to east of isolated hill in right center as about 200 meters thick Dark streaks on pyroclastic-flow deposits are lahar deposits generated by rains U S Geological Survey Photograph taken on June 29 1991 by Ed Wolfe http //vulcan wr usgs gov/Volcanoes/Philippines/Pinatubo/images html Image resized PD-USGov Aerial photographs of the Philippines 1991 eruption of Mount Pinatubo Eruption columns Volcanic ash Volcanic ash in the Philippines |