<?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>Roger D. Borcherdt</dc:creator>
  <dc:date>1977</dc:date>
  <dc:description>&lt;p&gt;The general theory of viscoelasticity, which accounts for elastic as well as anelastic linear behavior of materials, predicts that two types of&amp;nbsp;&lt;i&gt;S&lt;/i&gt;&amp;nbsp;waves propagate in anelastic earth materials. The particle motion for an inhomogeneous plane&amp;nbsp;&lt;i&gt;S&lt;/i&gt;&amp;nbsp;wave of type I is elliptical in the plane defined by the directions of propagation and attenuation, while the particle motion for an inhomogeneous plane&amp;nbsp;&lt;i&gt;S&lt;/i&gt;&amp;nbsp;wave of type II is linear perpendicular to this plane. The general theory predicts that an&amp;nbsp;&lt;i&gt;S&lt;/i&gt;-wave incident upon a plane boundary perpendicular to the plane defined by the directions of propagation and attenuation generates&amp;nbsp;&lt;i&gt;S&lt;/i&gt;&amp;nbsp;waves only of the same type. General characteristics of the type-II&amp;nbsp;&lt;i&gt;S&lt;/i&gt; waves reflected and refracted at plane anelastic boundaries are:&lt;/p&gt;&lt;p&gt;(a) velocities and maximum attenuations which depend on the angle of incidence and frequency,&lt;/p&gt;&lt;p&gt;(b) maximum energy flow at a different velocity and in a different direction than phase propagation,&lt;/p&gt;&lt;p&gt;(c) energy flow across the boundary due to interaction of the incident and reflected waves.&lt;/p&gt;&lt;p&gt;The general theory predicts these characteristics for the waves whenever a plane type-II&amp;nbsp;&lt;i&gt;S&lt;/i&gt;&amp;nbsp;wave interacts with a plane anelastic boundary such as a soil-bedrock, crust-mantle, or core-mantle interface. None of these characteristics are predicted for the plane&amp;nbsp;&lt;i&gt;SH&lt;/i&gt;&amp;nbsp;waves described by elasticity theory.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1785/BSSA0670010043</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Seismological Society of America</dc:publisher>
  <dc:title>Reflection and refraction of type-II S waves in elastic and anelastic media</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>