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- T23C-0148: Linking Fault Slip and Near-Surface Deformation on the Southern San Andreas Fault at Mecca Hills
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Board 0148‚ Hall EFG (Poster Hall)NOLA CC
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Asenath Kwagalakwe, California State University Northridge (First Author, Presenting Author)
Eileen Evans, California State University Northridge
Gladys Pantoja, Clarkson University
Allen Gontz, Clarkson University
Understanding how faults move near the surface is important for predicting earthquake damage, guiding building practices, and estimating fault slip. However, this shallow part of the Earth's crust is not well understood due to its complexity. In this study, we examine how the southern San Andreas Fault (sSAF) deforms the near surface at Painted Canyon in Mecca Hills, California. This segment moves at a long-term rate of 14-19 mm/yr, with ~4 mm/yr of that as surface creep, possibly from untriggered and/or triggered slip during nearby earthquakes. At Painted Canyon, the creeping area is ~200 m offset from the known fault line, suggesting complex surface strain. Using Ground Penetrating Radar (GPR) and updated GNSS measurements from a 2014 survey, we mapped the main fault and nearby strands. GNSS data show where surface deformation is focused and how it changed after the ~15 mm triggered slip from the 2017 Chiapas earthquake. These findings help link surface movement to subsurface structures and improve understanding of shallow fault behavior.
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