Thick pyroclastic flow deposits from the 1991 eruption of Pinatubo were rapidly eroded in the years following the eruption. This 7 September 1994 view of the upper Marella River valley from the SW, with the caldera rim on the skyline, shows the effects of the erosion of well over 100 m of pyroclastic flow deposits. Light-colored deposits in the channels at the middle right and lower left are post-1991 lahar deposits.

Photo by Chris Newhall, 1994 (U.S. Geological Survey).

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Keywords: deposit | erosion | environmental impact | tephra | ash | lahar

Pinatubo