The broad light-colored areas are thick pyroclastic flow deposits from the 15 June 1991 Pinatubo eruption. This 29 June photo taken two weeks after the eruption is looking towards the east with Clark Air Base just beyond the margin of the pyroclastic flow fan. Debris flows or lahars have remobilized significant volumes of the unconsolidated pumice and ash since 1991. Mount Arayat is visible at the upper left.

Photo by Ed Wolfe, 1991 (U.S. Geological Survey).

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

Pinatubo