Introduction

Located in the northwestern United States, the Newberry hotspot track, along the Oregon High Lava Plains (HLP), consists of a sequence of age-progressive silicic volcanic domes and lava flows, showing a monotonic age progression from east to west ending at the Newberry Caldera. While mantle plumes are often called upon to explain hotspot tracks, the Newberry hotspot track cannot be the product of plate motion over a stationary mantle source as its orientation is $\sim $120$^{\circ}$to plate motion, making it a good case study for alternative causal mechanisms of hotspot tracks. Four tectonic models have been proposed: (1) subduction counterflow (Draper, 1991; Jordan et al., 2004), (2) gravitational flow along lithospheric topography (Humphreys et al., 2000; Jordan et al., 2004), (3) lithospheric faulting (Rocchi et al., 2003), and (4) extension of Basin and Range (Christiansen et al., 2002). To study the Newberry track, the Oregon Array for Teleseismic Study (OATS) was installed in May 2003 and will operate until the spring of 2006 (Figure 13.30). Data is archived at DMC.

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