<?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>Alan K. Yong</dc:creator>
  <dc:date>2016</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;This study was prompted by the recent availability of a significant amount of openly accessible measured &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/sub&gt;&lt;span&gt; values and the desire to investigate the trend of using proxy-based models to predict &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/sub&gt;&lt;span&gt; in the absence of measurements. Comparisons between measured and model-based values were performed. The measured data included 503 &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/sub&gt;&lt;span&gt; values collected from various projects for 482 seismographic station sites in California. Six proxy-based models—employing geologic mapping, topographic slope, and terrain classification—were also considered. Included was a new terrain class model based on the &lt;/span&gt;&lt;a class="ref NLM_xref-bibr"&gt;Yong et al. (2012)&lt;/a&gt;&lt;span&gt; approach but recalibrated with updated measured &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/sub&gt;&lt;span&gt; values. Using the measured &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/sub&gt;&lt;span&gt; data as the metric for performance, the predictive capabilities of the six models were determined to be statistically indistinguishable. This study also found three models that tend to underpredict &lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/sub&gt;&lt;span&gt; at lower velocities (NEHRP Site Classes D–E) and overpredict at higher velocities (Site Classes B–C).&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1193/013114EQS025M</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Earthquake Engineering Research Institute </dc:publisher>
  <dc:title>Comparison of measurement- and proxy-based Vs30 values in California</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>