Ash/Tephra Fall

Summary of volcanic hazards for the Crater Lake region.

Eruption History for Mount Mazama and Crater Lake Caldera

Crater Lake (Mount Mazama) has not produced significant eruptive activity in the past approximately 5000 years, and a reawakening of the volcanic system could result in a variety of volcano hazards, including tephra fall.

The long history of volcanism at Mount Mazama, the volcano that houses Crater Lake, suggests that this volcanic center will be active in the future. Future eruptions will likely occur within the caldera and probably beneath the water's surface.

Mount Mazama is one of the major volcanoes of the Cascades Arc.