Global Volcanism Program | Image GVP-01313
The broad, light-colored areas are thick deposits of pyroclastic flows from the 15 June 1991 eruption of Pinatubo. 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. Erosion of the unconsolidated pumice and ash since 1991 has extensively dissected the fan. Mount Arayat is visible at the upper left.
Photo by Ed Wolfe, 1991 (U.S. Geological Survey).