Redoubt Volcano, Cook Inlet, Alaska: A hazard assessment based on eruptive activity through 1968

Abstract

Redoubt Volcano is one of four composite volcanoes on the west side of Cook Inlet, Alaska, which have been active during Holocene time and which pose a hazard to the state's main population center. The volcano, a typical convergent-arc volcano, is composed of about 40 cubic kilometers (kirr) of interbedded lava flows, nibble, and pyroclastic material, which are chiefly of andesitic composition. Minor basaltic and dacitic rocks make up a small part of the volcano. Most of the cone building occurred during middle and late Pleistocene time. At least 30 large tephra-forming eruptions have occurred during the past 10,000 years. Eruptions in 1902Eruptions in , 1966Eruptions in , 1968Eruptions in , and 1989-90 -90 produced ash and generated floods on the Drift River, which drains the north side of the volcano, by melting part of the volcano's extensive glacial cover.