12780 – Volcanic Evolution of the Crater Lake Region

Investigator’s Annual Reports (IAR’s) for Crater Lake National Park

Volcanic Evolution of the Crater Lake Region


Report Number: 12780

Reporting Year: 1996

Permit Number: CRLA1996AOZA

Date Received: Jan 01, 1998

Principal Investigator: Charles Bacon, U.S. Geological Survey, Menlo park, California

Park-assigned Study Id. # CRLA1996AOZA

Permit Expiration Date: Jan 01, 1998

Permit Start Date: Jan 01, 1998

Study Starting Date: Jan 01, 1996

Study Ending Date: Jan 01, 1996

Study Status: Completed

Activity Type: Other

Subject/Discipline: Geology / General

Objectives: To document the growth and evolution of Mount Mazama, the volcanic complex in which Crater Lake caldera lies, in order to define processes that led to an accumulation of a large volume of silicic magma in the upper crust. Secondary goals are to further knowledge of catastrophic eruptions, such as the one that resulted in the collapse of the caldera.

Findings and Status:  Work continues on preparation of the 1:24,000 scale geologic map for publication. Digital files of the gelogic map and all eleven geologic panoramas of the caldera walls are being edited in ArcInfo. These will be published in color. In cooperation with USGS colleagues at the Cascades Volcano Observatory, work was completed on a draft volcano and earthquake hazards assessment of the Crater Lake area. A report was issued on geothermal resources of the Crater Lake region. Talks were given at the Chapman conference on Crater Lakes, Terrestrial Degassing, and Hperacid Fluids in the Environment(1), held at Crater Lake, and at the Fall meeting of the American Geophysical Union. Participatin in the Chapman Conference included leading a field trip at Crater lake for approximately 50 scientists from around the world.

For this study, were one or more specimens collected and removed from the park but not destroyed during analyses? No

Funding provided this reporting year by NPS: 0

Funding provided this reporting year by other sources: 0

Full name of college or university:  n/a

Annual funding provided by NPS to university or college this reporting year: 0


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