A Geo-referenced 3D model of the Juan de Fuca Slab and associated seismicity

Blair, J. L.; McCrory, P. A.; Oppenheimer, D. H.; Waldhauser, F.

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.

Genre:

USGS Numbered Series

ProdID:

70006177

Citation Author:

Blair, J. L.; McCrory, P. A.; Oppenheimer, D. H.; Waldhauser, F.

Citation Contributing Office:

Earthquake Science Center; Menlo Park Science Center

Citation Datum:

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Citation Edition:

Originally Posted December 2, 2011; Version 1.1: October 3, 2012; Version 1.2: April 29, 2013

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Citation Language:

English

Citation Larger Work Title:

Citation LatN:

52.7

Citation LatS:

38.92

Citation LonE:

-116.68

Citation LonW:

-132.74

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Citation Phsyical Description:

Readme File; Animation Folder; Map; Data Folder; Metadata Folder

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Citation Publisher:

U.S. Geological Survey

Citation Series:

Data Series

Citation Series Code:

Citation Series Number:

633

Citation Search Results Text:

A Geo-referenced 3D model of the Juan de Fuca Slab and associated seismicity; 2011; DS; 633; Blair, J. L.; McCrory, P. A.; Oppenheimer, D. H.; Waldhauser, F.

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Citation Year:

2011

Type:

citation/reference

Text:

A Geo-referenced 3D model of the Juan de Fuca Slab and associated seismicity; 2011; DS; 633; Blair, J. L.; McCrory, P. A.; Oppenheimer, D. H.; Waldhauser, F.