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

January 1, 2009

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.

Citation Information

Publication Year 2009
Title The post-Mazama northwest rift zone eruption at Newberry Volcano, Oregon
DOI 10.1130/2009.fld015(05)
Authors Daniele McKay, Julie M. Donnelly-Nolan, Robert A. Jensen, Duane E. Champion
Publication Type Book Chapter
Publication Subtype Book Chapter
Series Title
Series Number
Index ID 70157124
Record Source USGS Publications Warehouse
USGS Organization Volcano Science Center