Simplified frontal thrust splay fault geometries at the Cascadia Subduction Zone mapped using multi-channel seismic (MCS) reflection data
This dataset contains offshore fault geometries for frontal thrust splay faults in the Cascadia Subduction Zone (CSZ) that were mapped and developed for use in 3D ground motion simulations (Dunham and others, 2025). There are a total of 6 thrust faults (A-F), three of the faults (A-C) were mapped by interpretation of seismic reflection data (Ledeczi and others, 2024; Lucas and others, 2025) from the ultra-long offset seismic reflection imagery collected during the CASIE21 experiment (Carbotte and others, 2023). Fault D is also mapped using the CASIE21 seismic data but only using a single seismic line, so has fewer constraints and is processed using the methods outlined for Faults E and F. Faults E and F were interpreted primarily using legacy seismic data from the Mendocino Triple Junction Seismic Experiment (1994) and interpretations in Gulick and others (1998). We present this data in two formats, files that contain 2D seismic picks from the interpretation of the seismic data and interpolated fault geometries that are included in the final kinematic earthquake rupture models. We also include the mapview location of the deformation front, which is approximated as a continuous boundary and defined by where the incoming sediment section atop the downgoing Juan de Fuca Plate is observed to be deformed in CASIE21 seismic reflection imagery (Lucas and others, 2025). The deformation front is interpolated between 2D seismic lines using high-resolution USGS 30-meter bathymetry compilations (Dartnell and others, 2023, 2026; Beeson and others, 2025) and 50-meter GMRT (Global Multi-Resolution Topography) bathymetry compilation (Ryan and others, 2009). Note that the deformation front is not the megathrust fault location, but instead where accretionary wedge deformation begins. See references.pdf for full in-text citation information.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "Audrey Dunham", "@type": "vcard:Contact", "hasEmail": "mailto:adunham@usgs.gov" } |
| description | This dataset contains offshore fault geometries for frontal thrust splay faults in the Cascadia Subduction Zone (CSZ) that were mapped and developed for use in 3D ground motion simulations (Dunham and others, 2025). There are a total of 6 thrust faults (A-F), three of the faults (A-C) were mapped by interpretation of seismic reflection data (Ledeczi and others, 2024; Lucas and others, 2025) from the ultra-long offset seismic reflection imagery collected during the CASIE21 experiment (Carbotte and others, 2023). Fault D is also mapped using the CASIE21 seismic data but only using a single seismic line, so has fewer constraints and is processed using the methods outlined for Faults E and F. Faults E and F were interpreted primarily using legacy seismic data from the Mendocino Triple Junction Seismic Experiment (1994) and interpretations in Gulick and others (1998). We present this data in two formats, files that contain 2D seismic picks from the interpretation of the seismic data and interpolated fault geometries that are included in the final kinematic earthquake rupture models. We also include the mapview location of the deformation front, which is approximated as a continuous boundary and defined by where the incoming sediment section atop the downgoing Juan de Fuca Plate is observed to be deformed in CASIE21 seismic reflection imagery (Lucas and others, 2025). The deformation front is interpolated between 2D seismic lines using high-resolution USGS 30-meter bathymetry compilations (Dartnell and others, 2023, 2026; Beeson and others, 2025) and 50-meter GMRT (Global Multi-Resolution Topography) bathymetry compilation (Ryan and others, 2009). Note that the deformation front is not the megathrust fault location, but instead where accretionary wedge deformation begins. See references.pdf for full in-text citation information. |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Digital Data", "format": "XML", "accessURL": "https://doi.org/10.5066/P138BZRA", "mediaType": "application/http", "description": "Landing page for access to the data" }, { "@type": "dcat:Distribution", "title": "Original Metadata", "format": "XML", "mediaType": "text/xml", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.69e7a5e8b66b0164d0f72586.xml" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/USGS_69e7a5e8b66b0164d0f72586 |
| keyword |
[ "Cascadia Subduction Zone", "U.S. Pacific Northwest", "USGS:69e7a5e8b66b0164d0f72586", "faulting (geologic)", "geoscientificInformation" ] |
| modified | 2026-05-07T00:00:00Z |
| publisher |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| spatial | -128.0000, 42.0000, -121.0000, 50.0000 |
| theme |
[ "geospatial" ] |
| title | Simplified frontal thrust splay fault geometries at the Cascadia Subduction Zone mapped using multi-channel seismic (MCS) reflection data |
