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Global Volcanism Program | Image GVP-01927

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. The closest forest-covered hill (left center) was entirely surrounded by 15 June 1991 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).

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. The closest forest-covered hill (left center) was entirely surrounded by 15 June 1991 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).

Keywords: deposit | erosion | environmental impact


Pinatubo