Mount Griggs

Mount Griggs is a stratovolcano in Katmai National Park located within Alaska's Aleutian Range, with an elevation of 2,317 meters. The mountain displays three concentric craters and a symmetrical cone structure that dominates the surrounding landscape.

The volcano was named after Dr. Robert Fiske Griggs, a botanist whose research resulted in the establishment of Katmai National Monument in 1918. His explorations of the region contributed greatly to protecting this area.

Scientists regularly study Mount Griggs to understand volcanic behavior and magma composition, which differs from other volcanoes in the Katmai group.

The mountain's slopes feature active fumaroles that produce loud roaring sounds audible from the valley floor. Visitors need to maintain safe distances from these thermal features and stay alert to their locations.

Although no recorded historic eruptions have occurred, the volcano displays vigorous fumarolic activity at its summit crater and along the southwest flank. This active thermal behavior without any modern eruptions makes it a notable subject for volcanologists.

GPS coordinates: 58.35675,-155.10288

Latest update: December 12, 2025 07:59