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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>Y. Xu</dc:contributor>
  <dc:contributor>J. Xia</dc:contributor>
  <dc:creator>Y. Zhang</dc:creator>
  <dc:date>2011</dc:date>
  <dc:description>&lt;p class="chapter-para"&gt;We analyse dispersion and attenuation of surface waves at free surfaces of possible vacuum/poroelastic media: permeable-‘open pore’, impermeable-‘closed pore’ and partially permeable boundaries, which have not been previously reported in detail by researchers, under different surface-permeable, viscous-damping, elastic and fluid-flowing conditions. Our discussion is focused on their characteristics in the exploration-seismic frequency band (a few through 200 Hz) for near-surface applications. We find two surface-wave modes exist,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;1 waves for all conditions, and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;2 waves for closed-pore and partially permeable conditions. For&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;1 waves, velocities disperse most under partially permeable conditions and least under the open-pore condition. High-coupling damping coefficients move the main dispersion frequency range to high frequencies. There is an&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;f&lt;/i&gt;&lt;sup&gt;1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;frequency dependence as a constant-&lt;i&gt;Q&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;model for attenuation at high frequencies.&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;1 waves for the open pore are most sensitive to elastic modulus variation, but least sensitive to tortuosities variation.&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;1 waves for partially permeable surface radiate as non-physical waves (Im(&lt;i&gt;k&lt;/i&gt;) &amp;lt; 0) at low frequencies. For&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;2 waves, velocities are slightly lower than the bulk slow&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;2 waves. At low frequencies, both velocity and attenuation are diffusive of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;f&lt;/i&gt;&lt;sup&gt;1/2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;frequency dependence, as&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;2 waves. It is found that for partially permeable surfaces, the attenuation displays -&lt;i&gt;f&lt;/i&gt;&lt;sup&gt;1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;frequency dependence as frequency increasing. High surface permeability, low-coupling damping coefficients, low Poisson′s ratios, and low tortuosities increase the slope of the -&lt;i&gt;f&lt;/i&gt;&lt;sup&gt;1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;dependence. When the attenuation coefficients reach 0,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;2 waves for partially permeable surface begin to radiate as non-physical waves.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1111/j.1365-246X.2011.05168.x</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Oxford Academic</dc:publisher>
  <dc:title>Analysis of dispersion and attenuation of surface waves in poroelastic media in the exploration-seismic frequency band</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>