Group A, Poster #231, Community Earth Models (CEM)
Problems and Inconsistencies with Major Preferred Faults in the Community Fault Model (CFM6.1)
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Poster Presentation
2024 SCEC Annual Meeting, Poster #231, SCEC Contribution #13918 VIEW PDF
eration as to which was more kinematically compatible with adjacent faults, and fault selection was based exclusively on statistical rankings of perceived model preference. Several previous preferred models were replaced by older outdated alternative models not validated with data, or which were mutually exclusive and thus incompatible with each other or with adjacent faults. The result was a preferred CFM6.0/6.1 fault set [Marshall et al., 2023] that no longer meets its previous standards of internal consistency and predictability. Several adopted models (San Andreas, Banning, Garnet Hill, Pitas Point, San Mateo-Carlsbad, etc.) are fundamentally inconsistent with decades of relocated hypocenters and aligned focal mechanism nodal planes, subsequent publications, and/or updated surface and seafloor trace maps, while others (e.g., Palos Verdes) are not mechanically feasible. Major sections of the Compton thrust connector under LA, Sierra Cucapah, and San Mateo-Carlsbad faults are currently missing, and the CFM6.1 Southern San Andreas fault that replaced the CFM6.0 version (which had an unexplained 15-km fault gap) is incompatible with the Mission Creek fault with which it merges, is not consistent with seismicity, seismic imaging or gravity modeling, and it too exhibits a fault gap near Bombay Beach. Alternative models previously selected as preferred faults for CFM5.3 [Nicholson et al., 2021] do not exhibit these same problems. These inconsistencies with specific CFM6.1 (and now CFM7.0?) faults have been well-documented for years, and so warrant not only a proper re-evaluation of the CFM6.1 preferred 3D fault set using data validation, not user surveys, as the primary selection criteria, but also a re-evaluation of the CFM6.0/6.1 preferred model selection process itself.
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