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Slip rate uncertainty: Examples from the Calico and Lenwood faults

Slip rate uncertainty: Examples from the Calico and Lenwood faults. Dr. Mike Oskin Department of Geological Sciences University of North Carolina at Chapel Hill. Co-PI : Lesley Perg Students : Mike Strane, Emily Gurney, Eitan Shelef, Dylan Blummentritt

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Slip rate uncertainty: Examples from the Calico and Lenwood faults

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  1. Slip rate uncertainty: Examples from the Calico and Lenwood faults Dr. Mike Oskin Department of Geological Sciences University of North Carolina at Chapel Hill

  2. Co-PI: Lesley Perg Students: Mike Strane, Emily Gurney, Eitan Shelef, Dylan Blummentritt Collaborators: Alex Iriondo, Brad Singer, Sujoy Mukhopadhyay Emily Mike Lesley Eitan

  3. Geodesy 12 ± 2 mm/yr Central Mojave Transect Paleoseismology 5 to 7 mm/yr (Estimate)

  4. Earthquake Timing Average Earthquake Recurrence of 3 to 9 kyr Well-constrained Poorly-constrained Recent cluster began ~1000 ka Paleoseismic clusters from the ECSZ south of Barstow From T. Rockwell, S. Lindvall, and C. Rubin

  5. Alluvial Fan Markers of Fault Slip Abandoned Wash Surface Alluvial Fill Active Wash Surface

  6. Desert Pavement Development of Alluvial Fan Stratigraphy Soil Development

  7. Central Mojave Transect Camp Rock Helendale Pisgah-Bullion Calico Lenwood Ludlow

  8. Slip Rate Measurements Calico Fault 3 km Area of LIDAR Sheep Spring Wash Pipkin Cinder Cone 740±40 ka SRTM Topography

  9. Slip Rates CalicoFault Q2b K Q2a F Q1 B QTcg Oskin et al. (2007)

  10. Plio-Quaternary Growth Strata Fanning Dips

  11. Q1 Fan: First occurrence of ca. 740 ka basalt clasts in growth section Tilted Q1 Alluvial Fan 661 ± 20 ka 3He Exposure Date on one basalt clast

  12. Restorationof Q1 Fan Displacement900 ± 200 metersAge: 650 ± 100 ka1.4 ± 0.4 mm/yr Today ~300 ka? 650 ka

  13. Cosmogenic Exposure Dating + X n n ol 3He: stable, rare qtz 10Be: t1/2 = 1.5 Myr

  14. Quartz Monzonite & Basalt Boulders Quartz and Basalt Pebble Desert Pavement Q2b Fan Surface

  15. Cosmogenic Dates from Q2b Terrace and Modern Wash Quartz Monzonite 10Be Basalt 3He Age (ka) 10Be Age - Inheritance: 56.4 ± 7.7 ka (2) Boulders Pavement Pavement Boulders Wash Boulders Wash Boulders

  16. Lithology-Dependent Hillslope Residence Time

  17. Restoration of Q2a Terrace Displacement100 ± 10 meters 1.8 ± 0.3 mm/yr(95% confidence, Errors summed as root mean square)

  18. Central Mojave Transect Camp Rock Helendale Pisgah-Bullion Calico Lenwood Ludlow

  19. Lenwood FaultSlope Map: Darker = Steeper Q2b

  20. Slip Rate: 0.8 +0.2/-0.3 mm/yr

  21. ≤0.8 ± 0.2 mm/yr ≤1.4 ± 0.6 mm/yr ≤0.4 ± 0.2 mm/yr Central Mojave Transect Pisgah-Bullion Fault Lenwood Fault Calico Fault Helendale Fault Ludlow Fault Camp Rock Fault 0.8 ± 0.2 mm/yr 1.8 ± 0.3 mm/yr 1.0 ± 0.2 mm/yr Total: ≤6.1 ± 1.9 mm/yr (95% confidence, errors summed as root mean square, 10Be production rate uncertainty added after summation)

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