Enhancements, Updates, and Improved Access to the Community Fault Model

Craig Nicholson, Andreas Plesch, John H. Shaw, & Scott T. Marshall

Published August 14, 2018, SCEC Contribution #8508, 2018 SCEC Annual Meeting Poster #145

Although the Community Fault Model (CFM) is one of the most mature modeling efforts within SCEC and has seen widespread use in many aspects of our science (e.g., UCERF3, ground motion studies, earthquake simulators, rupture modeling, hazard assessment, etc.), it remains critical that the CFM be validated, updated and improved to more effectively support a wide range of community modeling activities targeted by SCEC5. For 2018, we continue to focus on expanding access to the current model and improving its database component, while developing additional CFM enhancements. This includes completing a formal release of CFM version 5.2, an updated and expanded fault metadata spreadsheet, GIS map trace representations of CFM fault surface traces and blind fault tip-lines, remeshed versions of CFM-v.5.2 fault surfaces at regular-gridded 100 & 500-m intervals, an expanded CFM 3D fault set, and a new formal SCEC CFM webpage available at: https://www.scec.org/research/cfm. The CFM webpage now provides links to the v.5.2 original and remeshed triangulated surfaces, previously reviewed and ranked CFM versions 3.0 and 4.0, as well as a suite of community tools to help evaluate and view the CFM. The expanded CFM database includes linkages between CFM fault geometry and UCERF3 slip rate information, which together with the remeshed CFM surfaces helps support earthquake simulator modeling efforts. The expanded 3D fault set for CFM includes an updated Lytle Creek fault in the Cajon Pass Earthquake Gate Area, an alternative, low-angle Southern San Cayetano fault in the Ventura Special Fault Study Area, down-dip extensions of the east-dipping Thirtymile Bank and Coronado Bank detachments (and potential interaction with the Newport-Inglewood-Rose Canyon fault system), and an updated Santa Susana fault. We are also working on developing additional web-based tools for viewing and evaluating CFM in preparation for a formal community review of CFM-v.5.2. Currently, CFM-v.5.0 is available for 3D viewing by accessing links to the latest version of SCEC-VDO (v.17.8) and an associated README instruction file from the CFM webpage.

Key Words
3D fault models, CFM, fault database access

Citation
Nicholson, C., Plesch, A., Shaw, J. H., & Marshall, S. T. (2018, 08). Enhancements, Updates, and Improved Access to the Community Fault Model. Poster Presentation at 2018 SCEC Annual Meeting.

Related Projects & Working Groups
SCEC Community Models (CXM)