The June 29, 1991 eruption column from <a href="https://en.wikipedia.org/wiki/Mount_Pinatubo" class="extiw" title="en:Mount Pinatubo">Mount Pinatubo</a> with Marella River Valley. Aerial view to north of <a href="https://en.wikipedia.org/wiki/pyroclastic_flow" class="extiw" title="en:pyroclastic flow">pyroclastic flow</a> deposits in Marella River valley (in foreground) and tributaries of Balin Buquero River (in distance) with ash plume rising from Pinatubo's caldera. Pyroclastic flow deposits to east of isolated hill in right center as about 200 meters thick. Dark streaks on pyroclastic flow deposits are lahar deposits generated by rains.
U.S. Geological Survey Photograph taken on June 29, 1991, by Ed Wolfe.
<a href="https://en.wikipedia.org/wiki/United_States_Geological_Survey" class="extiw" title="en:United States Geological Survey">United States Geological Survey</a>
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