Collapse of the flow fronts of steep-sided andesitic-dacitic lava flows capping San Pedro volcano (background) produced an extensive apron of hot avalanche deposits that extends up to 20 km from the volcano. Volcanologist Katia Krafft provides scale beside a prismatically jointed block in this view from the west. The youngest cone of San Pedro was constructed within a scarp (whose northern wall forms the peak at the left) produced when an older edifice collapsed. The 6145-m-high San Pedro forms a twin volcano with 6092-m San Pablo.

Copyrighted photo by Katia and Maurice Krafft, 1983.

Copyrighted image used with permission. All Rights Reserved. Contact photographer for any usage requests.

San Pedro-San Pablo