U.S. Geological Survey Open-File Report 01482
Preliminary Volcano-Hazard Assessment for Mount Spurr Volcano, Alaska
Christopher F. Waythomas and Christopher J. Nye
|Steam plume rising from Crater Peak vent on south flank of Mount Spurr volcano. Summit of Mount Spurr in background and partially obscured by steam plume. Aerial photograph taken September 4, 1992, by C.A. Neal (U.S. Geological Survey-Alaska Volcano Observatory, Anchorage, Alaska).|
SUMMARY OF HAZARDS AT MOUNT SPURR VOLCANO
Mount Spurr volcano is an ice- and snow-covered stratovolcano complex located in the north-central Cook Inlet region about 100 kilometers west of Anchorage, Alaska. Mount Spurr volcano consists of a breached stratovolcano, a lava dome at the summit of Mount Spurr, and Crater Peak vent, a small stratocone on the south flank of Mount Spurr volcano. Historical eruptions of Crater Peak occurred in 1953 and 1992. These eruptions were relatively small but explosive, and they dispersed volcanic ash over areas of interior, south-central, and southeastern Alaska. Individual ash clouds produced by the 1992 eruption drifted east, north, and south. Within a few days of the eruption, the south-moving ash cloud was detected over the North Atlantic. Pyroclastic flows that descended the south flank of Crater Peak during both historical eruptions initiated volcanic-debris flows or lahars that formed temporary debris dams across the Chakachatna River, the principal drainage south of Crater Peak. Prehistoric eruptions of Crater Peak and Mount Spurr generated clouds of volcanic ash, pyroclastic flows, and lahars that extended to the volcano flanks and beyond. A flank collapse on the southeast side of Mount Spurr generated a large debris avalanche that flowed about 20 kilometers beyond the volcano into the Chakachatna River valley. The debris-avalanche deposit probably formed a large, temporary debris dam across the Chakachatna River.
THE ALASKA VOLCANO-HAZARD ASSESSMENT SERIES
This report is part of a series of volcano-hazard assessment reports being prepared by the Alaska Volcano Observatory. The reports are intended to describe the nature of volcanic hazards at Alaska volcanoes and show the extent of hazardous areas with maps, photographs, and other appropriate illustrations. Considered preliminary, these reports are subject to revision as new data become available.
View or download the complete 46-page, full-color version of this Open-File Report as an Adobe Portable Document Format (PDF) file (10.7 MB).
View a screen version of the hazard map (plate 1) or download a high-resolution PDF file of the map (37.7 MB) suitable for printing on a large-format plotter; size, approximately 24 x 21 inches.
Download Adobe Acrobat Reader for free.
| Download help | PDF help | Geopubs main page | Open-File Reports for 2001 |
| U.S. Department of the Interior | U.S. Geological Survey | Geologic Division | Volcano Hazards Program |
This report is also available from:
U.S. Geological Survey, Information Services
Box 25286, Federal Center
Denver, CO 80225
Telephone: 1888ASKUSGS (18882758747)