Title: P- and S-wave Velocity Models Incorporating the Cascadia Subduction Zone for 3D Earthquake Ground Motion Simulations—Update for Open-File Report 2007–1348 By William J. Stephenson, Nadine G. Reitman, and Stephen J. Angster 2017 U.S. Geological Survey Open-File Report 2017-1152 ScienceBase data release available at https://doi.org/10.5066/F7NS0SWM ABSTRACT: In support of earthquake hazards studies and ground motion simulations in the Pacific Northwest, three-dimensional (3D) P- and S-wave velocity (VP and VS, respectively) models incorporating the Cascadia subduction zone were previously developed for the region encompassed from about 40.2°N to 50°N latitude, and from about -122°W. to -129°W. longitude. This report describes updates to the Cascadia velocity property volumes of model version 1.3 ([V1.3]; Stephenson, 2007), herein called model version 1.6 (V1.6). As in model V1.3, the updated V1.6 model volume includes depths from 0 km (Mean Sea Level) to 60 km, and it is intended to be a reference for researchers who have used, or are planning to use, this model in their earth science investigations. To this end, it is intended that the Vp and Vs property volumes of model V1.6 will be considered a template for a community velocity model of the Cascadia region as additional results become available. With the recent and ongoing development of the National Crustal Model, we envision any future versions of this model will be directly integrated with that effort. DISCLAIMERS: This database, identified as OFR2017-1152, has been approved for release by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty, expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. Although this information product, for the most part, is in the public domain, it also may contain copyrighted material as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. REPORT FILES: The map, pamphlet, and readme files for this report are located at and can be downloaded via the Web from the U.S. Geological Survey publications website at https://doi.org/10.3133/ofr20171152 List of files: ofr20171152_00ReadMe.txt ofr20171152.pdf HOW TO OBTAIN THE DIGITAL PAMPHLET FILES: The digital files constituting this report can be obtained via the Internet from the U.S. Geological Survey publications website. Go to the web page at https://doi.org/10.3133/ofr20171152/ and follow the directions to download the files. The main product is a Portable Document Format (.pdf) pamphlet, which requires Adobe Acrobat for viewing. Acrobat software runs on a variety of systems, and is available for download free of charge from Adobe at http://www.adobe.com. SCIENCEBASE DATA RELEASE FILES The GIS database (data release) for this report is located at and can be downloaded via the Web from ScienceBase at https://doi.org/10.5066/F7NS0SWM and follow the directions to download the files.