A Geo-referenced 3D model of the Juan de Fuca Slab and associated seismicity
Data Series
633
By: J.L. Blair, P.A. McCrory, D. H. Oppenheimer, and F. Waldhauser
Links
- More information: USGS Index Page (html)
- Plate: Ds 633 (pdf)
- Companion File: Companion Files
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- Read Me: Read Me
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Abstract
We present a Geographic Information System (GIS) of a new 3-dimensional (3D) model of the subducted Juan de Fuca Plate beneath western North America and associated seismicity of the Cascadia subduction system. The geo-referenced 3D model was constructed from weighted control points that integrate depth information from hypocenter locations and regional seismic velocity studies. We used the 3D model to differentiate earthquakes that occur above the Juan de Fuca Plate surface from earthquakes that occur below the plate surface. This GIS project of the Cascadia subduction system supersedes the one previously published by McCrory and others (2006). Our new slab model updates the model with new constraints. The most significant updates to the model include: (1) weighted control points to incorporate spatial uncertainty, (2) an additional gridded slab surface based on the Generic Mapping Tools (GMT) Surface program which constructs surfaces based on splines in tension (see expanded description below), (3) double-differenced hypocenter locations in northern California to better constrain slab location there, and (4) revised slab shape based on new hypocenter profiles that incorporate routine depth uncertainties as well as data from new seismic-reflection and seismic-refraction studies. We also provide a 3D fly-through animation of the model for use as a visualization tool.
Suggested Citation
Blair, J., McCrory, P., Oppenheimer, D.H., Waldhauser, F., 2011, A Geo-referenced 3D model of the Juan de Fuca Slab and associated seismicity (Originally Posted December 2, 2011; Version 1.1: October 3, 2012; Version 1.2: April 29, 2013): U.S. Geological Survey Data Series 633, Readme File; Animation Folder; Map; Data Folder; Metadata Folder, https://doi.org/10.3133/ds633.
ISSN: 2327-638X (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | A Geo-referenced 3D model of the Juan de Fuca Slab and associated seismicity |
| Series title | Data Series |
| Series number | 633 |
| DOI | 10.3133/ds633 |
| Edition | Originally Posted December 2, 2011; Version 1.1: October 3, 2012; Version 1.2: April 29, 2013 |
| Year Published | 2011 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Earthquake Science Center, Menlo Park Science Center |
| Description | Readme File; Animation Folder; Map; Data Folder; Metadata Folder |
| Country | Canada;United States |
| State | British Columbia;California;Oregon;Washington |
| Other Geospatial | Juan De Fuca Slab |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |