Refraction Microtremor Vs(z) Profile Archive

<p>The PDF is a representation of a public website available at&nbsp;<a href="https://sites.google.com/view/vs-profile-archive">https://sites.google.com/view/vs-profile-archive</a></p> <p>The time-averaged seismic shear-wave velocity from the surface to 30 m (100 ft) depth, defined in the Building Code as Vs30, is in the United States one of the principal determinants of earthquake site-hazard classification. Over the past 20 years the Nevada Seismological Lab and the Applied Geophysics class at the University of Nevada, Reno; and Optim Earth have made shallow (&lt;1 km deep) shear-wave velocity measurements at hundreds of sites in Nevada, California, and New Zealand using refraction microtremor technology. Many of these measurements were made at stations in regional earthquake-monitoring networks, and sponsored by the US Geological Survey. The <a href="https://drive.google.com/open?id=15VSI4vhzPfy_GVoB_XYKsWfrhPM9u5E9">Google Drive link</a> leads to a directory structure grouping the measurements by region, and the files are often named with the monitoring network station name. Each file is a self-explanatory, plain-text list of the data and results from the measurement. Where multiple files are given for a particular site, measurements were made at slightly different refraction microtremor array locations, at different times, and by different interpreters; thus expressing both the aleatory variation of velocity in the ground and the epistemic variability of the measurement technique (+/- 15% according to <a href="https://drive.google.com/file/d/1hM3Ows2z2a_xzwriodQT-aKP-UlPubuB/view?usp=sharing">Louie, 2001</a>). Each measurement file includes refraction microtremor array location data, a summary Vs30 value, and a modeled shear-wave-velocity-versus-depth profile. Efforts are underway to add the picked refraction microtremor p-f image and the picked fundamental-mode Rayleigh-wave dispersion-curve data to each file. Many of these measurements have been published in peer-reviewed journal papers and project reports (available in the Preprint Archive from <a href="https://www.google.com/url?q=https%3A%2F%2Flouie.pub&amp;sa=D&amp;sntz=1&amp;usg=AFQjCNFFK9_R0AxlZlKRpWgeFFhzxMON0A">Louie.pub</a>). As well, these archives give additional details on refraction microtremor measurements found in the US Geological Survey's Vs30 archive at <a href="https://www.google.com/url?q=https%3A%2F%2Fearthquake.usgs.gov%2Fdata%2Fvs30%2Fus%2F&amp;sa=D&amp;sntz=1&amp;usg=AFQjCNEOXhj6fRvlr7ftsB-yN_DaDGcE8Q">https://earthquake.usgs.gov/data/vs30/us/</a> . All data in this archive are in the public domain, distributed under a <a href="https://www.google.com/url?q=https%3A%2F%2Fcreativecommons.org%2Flicenses%2Fby%2F4.0%2F&amp;sa=D&amp;sntz=1&amp;usg=AFQjCNHR4439nM4_Ar7-II5_R_iZxNxJdg">Creative Commons CC BY</a> license.</p>