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Nuno_Gutierrez, Ricardo; Rodriguez, Johnathan; Altuntas, Gozde; Polun, Sean; Gomez, Francisco; Bidgoli, Tandis S (, Geological Society of America, Abstracts with Program)
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Altuntas, Gozde; Gomez, Francisco (, University of Missouri)The Owl Lake Fault is an active, 19 to 25-km-long, left-lateral strike-slip fault that divaricates NE from the Garlock Fault toward Death Valley in eastern California and transfers regional strain to the fault systems in Death Valley. As an active fault, the Owl Lake Fault is a poorly understood link between the extension of Death Valley and other active faults within Mojave Desert. In addition to the larger tectonic framework, improved understanding of the Owl Lake Fault as a seismogenic structure has direct implication for the assessment of the earthquake hazard in Eastern California. A significant limitation on the understanding of the Owl Lake Fault's role is the wide range of estimates previously reported for its slip rate. These range from 0.5 to 7.8 mm/yr, which implies the Owl Lake Fault may accommodate nearly all of the present-day slip on the Garlock Fault. The project aims to constrain the slip rate and understand kinematics of the Owl Lake Fault. For this project, I have used recent airborne LiDAR data (approximately 4.6 points/m2) to map the fault and precisely measure horizontally offset landforms along the Owl Lake Fault. Subsequent to LiDAR mapping, field work facilitated the ground-truth verification of initial mapping as well as more precise measurements of small fault offsets using kinematic GPS and low-altitude photogrammetry. The detailed, local microtopography permits assessing the smallest offsets (75-100 cm) which are interpreted as reflecting the last coseismic offset. Initial efforts at refining the slip rate use scarp degradation models to infer the ages of alluvial fans and stream terraces that are offset by faulting. The final step for this project involves estimating slip rate, magnitude, and recurrence interval. Neotectonic investigations allowed to constrain the slip rate of the Owl Lake Fault as 1.1 - 1.4 mm/yr. The Owl Lake Fault can produce earthquake with the magnitude M=7.2 with the 1030 -- 1430-yr recurrence interval. This study demonstrates that the Owl Lake Fault is part of the same hazard consideration as the central Garlock Fault in eastern California.more » « less
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