89-11 CRESCENT CFM: A 3-D Community Fault Model for the Cascadia Subduction Zone, Canada and USA

Session: Advancing Earthquake Geology and Surficial Deformation from Geologic Provinces to Political Entities through Multidisciplinary High-Resolution Data

Presenting Author:

Rebecca Fildes

Authors:

Fildes, Rebecca A.¹, Amos, Colin², Roland, Emily C.³, Streig, Ashley R.⁴, Bennett, Scott E.K.⁵, Hatem, Alexandra⁶, Ledeczi, Anna Monika⁷, Meigs, Andrew J.⁸, Styron, Richard⁹, Tobin, Harold J.¹⁰

(1) Western Washington University-Geology Department, Bellingham, WA, USA, (2) Western Washington University, Bellingham, WA, USA, (3) Western Washington UniversityGeology Department, MS9080, Bellingham, WA, USA, (4) Portland State UniversityGeology, Geology, Portland, OR, USA, (5) U.S. Geological Survey, Portland, OR, USA; Portland State University, Portland, OR, USA, (6) U.S. Geological Survey, Golden, CO, USA, (7) University of Washington, Seattle, WA, USA, (8) Oregon State University, Corvallis, OR, USA, (9) Global Earthquake Model Foundation, Pavia, Italy, (10) University of WashingtonDept. of Earth and Space Sciences, Seattle, WA, USA,

Abstract:

The Cascadia region contains multiple sources of earthquake hazards including the plate boundary megathrust and faults within the upper (North America) and lower (Juan de Fuca) plates. Subduction-related active faults occur within and across domestic and international borders between the United States and Canada. Many such faults pose significant hazard to communities due to their proximity to population centers. The Cascadia Region Earthquake Science Center (CRESCENT) Community Fault Model (CFM) includes 2D and 3D representations of Quaternary-active faults in both the onshore and offshore portions of the North America plate, models of the plate interface, and accompanying metadata for each fault. Models of fault geometries are constructed based on available data in published, peer-reviewed literature and undergo revision through evaluation by community members. The initial framework for onshore faults is based on the USGS National Seismic Hazard Model 2023 fault sections database. These faults are then systematically evaluated and modified to reflect more complex fault structures where data is available. Recent high-resolution seismic data and fault analysis offshore Cascadia help expand the location and geometry of faults located within the accretionary wedge. The CFM includes many newly detailed mapped offshore splay faults across the margin that are important for understanding megathrust rupture propagation and tsunami hazard. Potential applications beyond seismic and tsunami hazard analyses include stress modeling, multi-cycle rupture modeling, and providing constraints for the CRESCENT Community Velocity Model. We continue to grow and improve the CRESCENT CFM through ongoing community engagement and feedback.

Geological Society of America Abstracts with Program. Vol. 57, No. 6, 2025

doi: 10.1130/abs/2025AM-7201

© Copyright 2025 The Geological Society of America (GSA), all rights reserved.