<?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>David J. Wald</dc:contributor>
  <dc:contributor>C. Bruce Worden</dc:contributor>
  <dc:contributor>Eric M. Thompson</dc:contributor>
  <dc:contributor>Gregory M. Smoczyk</dc:contributor>
  <dc:creator>David C. Heath</dc:creator>
  <dc:date>2020</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Time-averaged shear wave velocity over the upper 30 m of the earth’s surface (&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;) is a key parameter for estimating ground motion amplification as both a predictive and a diagnostic tool for earthquake hazards. The first-order approximation of&amp;nbsp;&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;&amp;nbsp;is commonly obtained through a topographic slope–based or terrain proxy due to the widely available nature of digital elevation models. However, better-constrained&amp;nbsp;&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;&amp;nbsp;maps have been developed in many regions. Such maps preferentially employ various combinations of&amp;nbsp;&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;&amp;nbsp;measurements, higher-resolution elevation models, lithologic, geologic, geomorphic, and other proxies and often utilize refined interpolation schemes. We develop a new hybrid global&amp;nbsp;&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;&amp;nbsp;map database that defaults to the global slope-based&amp;nbsp;&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;&amp;nbsp;map, but smoothly inserts regional&amp;nbsp;&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;&amp;nbsp;maps where available. In addition, we present comparisons of the default slope-based proxy maps against the new hybrid version in terms of&amp;nbsp;&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;&amp;nbsp;and amplification ratio maps, and uncertainties in assigned&amp;nbsp;&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;&amp;nbsp;values.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1177/8755293020911137</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Sage</dc:publisher>
  <dc:title>A global hybrid VS30 map with a topographic slope–based default and regional map insets</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>