<?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:contributor>G.R. Foulger</dc:contributor>
  <dc:contributor>B.R. Julian</dc:contributor>
  <dc:contributor>A.D. Miller</dc:contributor>
  <dc:creator>J.R. Evans</dc:creator>
  <dc:date>1996</dc:date>
  <dc:description>&lt;div class=""&gt;&lt;div class="article-section__content en main"&gt;&lt;p&gt;The Hengill region in SW Iceland is an unstable ridge-ridge-transform triple junction between an active and a waning segment of the mid-Atlantic spreading center and a transform that is transgressing southward. The triple junction contains active and extinct spreading segments and a widespread geothermal area. We evaluated shear-wave birefringence for locally recorded upper-crustal earthquakes using an array of 30 three-component digital seismographs. Fast-polarization directions, ϕ, are mostly NE to NNE, subparallel to the spreading axis and probably caused by fissures and microcracks related to spreading. However, there is significant variability in ϕ throughout the array. The lag from fast to slow&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;S&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;is not proportional to earthquake depth (ray length), being scattered at all depths. The average wave-speed difference between&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;qS1&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;qS2&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in the upper 2–5 km of the crust is 2–5%. Our results suggest considerable heterogeneity or strong&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;S&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;scattering.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1029/96GL00261</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>American Geophysical Union</dc:publisher>
  <dc:title>Crustal shear-wave splitting from local earthquakes in the Hengill triple junction, southwest Iceland</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>