<?xml version='1.0' encoding='utf-8'?>
<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:creator>D. Love</dc:creator>
  <dc:date>1961</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Normal&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;faults&lt;/span&gt;&lt;span&gt;&amp;nbsp;offset a bedrock surface scoured by Pleistocene ice&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;several areas within and&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;south&lt;/span&gt;&lt;span&gt;&amp;nbsp;of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Yellowstone&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;National&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Park&lt;/span&gt;&lt;span&gt;. Recurrent earthquake shocks and fresh appearance of some scarps suggest that movement is continuing along some&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;faults&lt;/span&gt;&lt;span&gt;. Four systems of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;faults&lt;/span&gt;&lt;span&gt;&amp;nbsp;are described.&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Quaternary&lt;/span&gt;&lt;span&gt;&amp;nbsp;movement occurred along more than 60&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;faults&lt;/span&gt;&lt;span&gt;&amp;nbsp;on the Mirror Plateau, 15 miles northeast of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Yellowstone&lt;/span&gt;&lt;span&gt;&amp;nbsp;Lake.&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Faults&lt;/span&gt;&lt;span&gt;&amp;nbsp;trend northwest, and several are more than 6 miles long. Maximum displacement exceeds 250 feet. The majority have northeast blocks downdropped, but some grabens and horsts are present. Eocene to Pliocene igneous or pyroclastic rocks are displaced. Ice moved southwest and&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;south&lt;/span&gt;&lt;span&gt;&amp;nbsp;from the Beartooth and Absaroka ranges, nearly at right angles to the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;fault&lt;/span&gt;&lt;span&gt;&amp;nbsp;trends. Drainage&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;many ice-scoured valleys was disrupted by faulting, and small lakes (such as Mirror Lake) formed on downthrown blocks. Thermal activity occurs along some of these&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;faults&lt;/span&gt;&lt;span&gt;. Directly east of Mirror Plateau, the Lamar normal&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;fault&lt;/span&gt;&lt;span&gt;&amp;nbsp;has a displacement of 1300 + feet; perhaps 1000 feet of this may have occurred during&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Quaternary&lt;/span&gt;&lt;span&gt;&amp;nbsp;time. The&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Yellowstone&lt;/span&gt;&lt;span&gt;&amp;nbsp;Falls&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;fault&lt;/span&gt;&lt;span&gt;&amp;nbsp;system cuts Pliocene rhyolite southeast of the Upper Falls of the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Yellowstone&lt;/span&gt;&lt;span&gt;&amp;nbsp;River.&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Faults&lt;/span&gt;&lt;span&gt;&amp;nbsp;trend northwest; maximum displacement exceeds 200 feet. The Solfatara&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;fault&lt;/span&gt;&lt;span&gt;&amp;nbsp;system trends north-northwest, cuts Pliocene rhyolite, and has a maximum&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Quaternary&lt;/span&gt;&lt;span&gt;&amp;nbsp;displacement of about 200 feet. The Hering Lake&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;fault&lt;/span&gt;&lt;span&gt;&amp;nbsp;system is a northern extension of the Teton&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;fault&lt;/span&gt;&lt;span&gt;, trends northward, and cuts Pliocene rhyolite and rhyolitic welded tuff. Maximum displacement is about 200 feet. West-flowing streams established on bedrock scoured by ice were disrupted, and Beula, Hering, and&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;South&lt;/span&gt;&lt;span&gt;&amp;nbsp;Boundary lakes formed on the downthrown (east) blocks. The sharp angular unstepped appearance of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;fault&lt;/span&gt;&lt;span&gt;&amp;nbsp;scarps 50 to 200 feet high&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;these&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;fault&lt;/span&gt;&lt;span&gt;&amp;nbsp;systems suggests that each scarp of this type was formed by one continuous movement. The displacement along&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;faults&lt;/span&gt;&lt;span&gt;&amp;nbsp;associated with the Hebgen earthquake of August 1959 is commonly less than 20 feet. The abundance of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Quaternary&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;faults&lt;/span&gt;&lt;span&gt;&amp;nbsp;and the record of 18 earthquakes&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;historic time suggest that additional faulting and earthquake activity can be expected&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;the future. Recognition of this probability should influence the location and type of construction of buildings and other facilities.&amp;nbsp;&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/0016-7606(1961)72[1749:RSOQFI]2.0.CO;2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Geological Society of America</dc:publisher>
  <dc:title>Reconnaissance study of quaternary faults in and south of Yellowstone National Park, Wyoming</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>