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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Robert B. Smith</dc:contributor>
  <dc:contributor>Richard M. Allen</dc:contributor>
  <dc:creator>Gregory P. Waite</dc:creator>
  <dc:date>2006</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;The movement of the lithosphere over a stationary mantle magmatic source, often thought to be a mantle plume, explains key features of the 16 Ma Yellowstone–Snake River Plain volcanic system. However, the seismic signature of a Yellowstone plume has remained elusive because of the lack of adequate data. We employ new teleseismic &lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;span&gt; and &lt;/span&gt;&lt;i&gt;S&amp;nbsp;&lt;/i&gt;&lt;span&gt;wave traveltime data to develop tomographic images of the Yellowstone hot spot upper mantle. The teleseismic data were recorded with two temporary seismograph arrays deployed in a 500 km by 600 km area centered on Yellowstone. Additional data from nearby regional seismic networks were incorporated into the data set. The &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;P&lt;/i&gt;&lt;/sub&gt;&lt;span&gt; and &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&amp;nbsp;&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;models reveal a strong low-velocity anomaly from ∼50 to 200 km directly beneath the Yellowstone caldera and eastern Snake River Plain, as has been imaged in previous studies. Peak anomalies are −2.3% for &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;P&lt;/i&gt;&lt;/sub&gt;&lt;span&gt; and −5.5% for &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;. A weaker, anomaly with a velocity perturbation of up to −1.0% &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;P&lt;/i&gt;&lt;/sub&gt;&lt;span&gt; and −2.5% &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;&lt;/sub&gt;&lt;span&gt; continues to at least 400 km depth. This anomaly dips 30° from vertical, west-northwest to a location beneath the northern Rocky Mountains. We interpret the low-velocity body as a plume of upwelling hot, and possibly wet rock, from the mantle transition zone that promotes small-scale convection in the upper ∼200 km of the mantle and long-lived volcanism. A high-velocity anomaly, 1.2%&lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;P&lt;/i&gt;&lt;/sub&gt;&lt;span&gt; and 1.9% &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;, is located at ∼100 to 250 km depth southeast of Yellowstone and may represent a downwelling of colder, denser mantle material.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1029/2005JB003867</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>American Geophysical Union</dc:publisher>
  <dc:title>V&lt;sub&gt;P&lt;/sub&gt; and V&lt;sub&gt;S&lt;/sub&gt; structure of the Yellowstone hot spot from teleseismic tomography: Evidence for an upper mantle plume</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>