Global Volcanism Program | Image GVP-01304
These relatively fine-grained layers are lahar deposits produced by successive overflows of dikes along the Bambam River, about 35 km NE of Pinatubo volcano in the Philippines. The photo was taken on 13 October 1991, a little more than a month after the end of the devastating 1991 eruption. Note the pen at the upper left for scale. By the end of 1991, rainfall-induced lahars had traveled 50 km down the Bambam River.
Photo by Chris Newhall, 1991 (U.S. Geological Survey).