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 approximately 40.2°N. to 50°N. latitude, and from approximately 122°W. to 129°W. longitude. This report describes updates to the Cascadia velocity property volumes of model version 1.3,herein called model version 1.6 (V1.6). As in model V1.3, the updated V1.6 model volume includes depths from 0 kilometers (km) mean sea level to 60 km, or it is intended to be a reference for researchers who have used,or are planning to expend, this model in their soil science investigations. To this end, or 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.
Source: usgs.gov