Oregon State University

The Mazama Tephra-Falls: Volcanic Hazards and Prehistoric Populations

The Mazama Tephra-Falls: Volcanic Hazards and Prehistoric Populations, by Stephan E. Matz.
1991. ($12.00)

About 7000 years ago two major tephra-falls blanketed the Pacific Northwest in volcanic ash. These two tephra-falls, identified as the Llao and climatic tephra-falls, were part of the eruptive events that led to the collapse of Mount Mazama to form Crater Lake in the southern Oregon Cascade Range. The tephra-falls occurred about 200 years apart, at around 7000 and 6800 years before present for the Llao and climatic eruptions, respectively. The effects of the tephra-falls have been characterized by different researchers as ranging from minimal to catastrophic. In order to better understand the effects of these two events on the flora, fauna, and people of the past, a model is presented to help organize the various lines of research into a coherent whole and to suggest profitable areas of research which have not yet been completed. The model is based on anthropological and ecological theory with a strong reliance on analogy with modern ecosystems and volcanic hazards research

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