| Abstract: | INTRODUCTION
In support of earthquake hazards and ground motion studies in the Pacific Northwest, three-dimensional P- and S-wave velocity (3D Vp and Vs) and density (3D rho) models incorporating the Cascadia subduction zone have been developed for the region encompassed from about 40.2?N to 50?N latitude, and from about -122?W to -129?W longitude. The model volume includes elevations from 0 km to 60 km (elevation is opposite of depth in model coordinates). Stephenson and Frankel (2003) presented preliminary ground motion simulations valid up to 0.1 Hz using an earlier version of these models. The version of the model volume described here includes more structural and geophysical detail, particularly in the Puget Lowland as required for scenario earthquake simulations in the development of the Seattle Urban Hazards Maps (Frankel and others, 2007). Olsen and others (in press) used the model volume discussed here to perform a Cascadia simulation up to 0.5 Hz using a Sumatra-Andaman Islands rupture history. As research from the EarthScope Program (http://www.earthscope.org) is published, a wealth of important detail can be added to these model volumes, particularly to depths of the upper-mantle. However, at the time of development for this model version, no EarthScope-specific results were incorporated. This report is intended to be a reference for colleagues and associates who have used or are planning to use this preliminary model in their research. To this end, it is intended that these models will be considered a beginning template for a community velocity model of the Cascadia region as more data and results become available. |
| Genre: | USGS Numbered Series |
| ProdID: | 80614 |
| Citation Author: | Stephenson, William J. |
| Citation Contributing Office: | USGS Earthquake Hazards Ground Motion Investigations |
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| Citation Edition: | Version 1.3 |
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| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | 0510000 |
| Citation LatS: | 0380000 |
| Citation LonE: | -1180000 |
| Citation LonW: | -1310000 |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | iii, 24 p. |
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| Citation Publisher: | Geological Survey (U.S.) |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 2007-1348 |
| Citation Search Results Text: | Velocity and Density Models Incorporating the Cascadia Subduction Zone for 3D Earthquake Ground Motion Simulations; 2007; OFR; 2007-1348; Stephenson, William J. |
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| Citation Year: | 2007 |
| Type: | citation/reference |
| Text: | Velocity and Density Models Incorporating the Cascadia Subduction Zone for 3D Earthquake Ground Motion Simulations; 2007; OFR; 2007-1348; Stephenson, William J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/of/2007/1348/ |
| Date Other: | Wed, 31 Oct 2007 00:00 -0500 |
| Publisher: | Geological Survey (U.S.) |
