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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>Eric M. Thompson</dc:contributor>
  <dc:contributor>David J. Wald</dc:contributor>
  <dc:contributor>Keith L. Knudsen</dc:contributor>
  <dc:contributor>Jack K. Odum</dc:contributor>
  <dc:contributor>William J. Stephenson</dc:contributor>
  <dc:contributor>Scott Haefner</dc:contributor>
  <dc:creator>Alan Yong</dc:creator>
  <dc:date>2016</dc:date>
  <dc:description>&lt;p&gt;&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;&lt;span&gt;, the time-averaged shear-wave velocity (&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;&lt;/sub&gt;&lt;/span&gt;&lt;span&gt;) to a depth of 30 meters, is a key index adopted by the earthquake engineering community to account for seismic site conditions.&amp;nbsp;&lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;span&gt;&lt;sub&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;is typically based on geophysical measurements of&amp;nbsp;&lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;span&gt;&lt;i&gt;&lt;sub&gt;&lt;span&gt;S&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/i&gt;&lt;/span&gt;&lt;span&gt;derived from invasive and noninvasive techniques at sites of interest. Owing to cost considerations, as well as logistical and environmental concerns,&amp;nbsp;&lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;span&gt;&lt;sub&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;data are sparse or not readily available for most areas. Where data are available,&amp;nbsp;&lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;span&gt;&lt;sub&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;values are often assembled in assorted formats that are accessible from disparate and (or) impermanent Web sites. To help remedy this situation, we compiled&amp;nbsp;&lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;span&gt;&lt;sub&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;measurements obtained by studies funded by the U.S. Geological Survey (USGS) and other governmental agencies. Thus far, we have compiled&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;values for 2,997 sites in the United States, along with metadata for each measurement from government-sponsored reports, Web sites, and scientific and engineering journals. Most of the data in our&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;compilation originated from publications directly reporting the work of field investigators. A small subset (less than 20 percent) of&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;values was previously compiled by the USGS and other research institutions. Whenever possible,&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;originating from these earlier compilations were crosschecked against published reports. Both downhole and surface-based&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;estimates are represented in our&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;compilation. Most of the&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;data are for sites in the western contiguous United States (2,141 sites), whereas 786&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;values are for sites in the Central and Eastern United States; 70 values are for sites in other parts of the United States, including Alaska (15 sites), Hawaii (30 sites), and Puerto Rico (25 sites). An interactive map is hosted on the primary USGS Web site for accessing&amp;nbsp;&lt;/span&gt;&lt;span&gt;&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;&lt;span&gt;&lt;span&gt;&lt;i&gt;S&lt;/i&gt;30&lt;/span&gt;&lt;/span&gt;&lt;/sub&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;data (&lt;a rel="noopener noreferrer" href="https://earthquake.usgs.gov/data/vs30/us/" target="_blank" data-auth="NotApplicable" data-mce-href="https://earthquake.usgs.gov/data/vs30/us/"&gt;https://earthquake.usgs.gov/data/vs30/us/&lt;/a&gt;&lt;/span&gt;&lt;span&gt;).&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/ds978</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>Compilation of &lt;em&gt;V&lt;/em&gt;&lt;sub&gt;&lt;em&gt;S&lt;/em&gt;30&lt;/sub&gt; Data for the United States</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>