The post-Mazama northwest rift zone eruption at Newberry Volcano, Oregon

By: , and 
Edited by: Jim O'ConnorRebecca Dorsey, and Ian P. Madin



The northwest rift zone (NWRZ) eruption took place at Newberry Volcano ~7000 years ago after the volcano was mantled by tephra from the catastrophic eruption that destroyed Mount Mazama and produced the Crater Lake caldera. The NWRZ eruption produced multiple lava flows from a variety of vents including cinder cones, spatter vents, and fissures, possibly in more than one episode. Eruptive behaviors ranged from energetic Strombolian, which produced significant tephra plumes, to low-energy Hawaiian-style. This paper summarizes and in part reinterprets what is known about the eruption and presents information from new and ongoing studies. Total distance spanned by the eruption is 32 km north-south. The northernmost flow of the NWRZ blocked the Deschutes River upstream from the city of Bend, Oregon, and changed the course of the river. Renewed mafic activity in the region, particularly eruptions such as the NWRZ with tephra plumes and multiple lava flows from many vents, would have significant impacts for the residents of Bend and other central Oregon communities.

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Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title The post-Mazama northwest rift zone eruption at Newberry Volcano, Oregon
DOI 10.1130/2009.fld015(05)
Year Published 2009
Language English
Publisher Geological Society of America
Publisher location Boulder, CO
Contributing office(s) Volcano Science Center
Description 20 p.
Larger Work Type Book
Larger Work Title Volcanoes to vineyards: geologic field trips through the dynamic landscape of the Pacific Northwest
First page 91
Last page 110
Country United States
State Oregon
Other Geospatial Newberry Volcano
Online Only (Y/N) N
Additional Online Files (Y/N) N