slip rate uncertainty: examples from the calico and lenwood faults
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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 - PowerPoint PPT PresentationTRANSCRIPT
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Slip rate uncertainty: Examples from the Calico and Lenwood faults
Dr. Mike OskinDepartment of Geological SciencesUniversity of North Carolina at Chapel Hill
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Co-PI: Lesley Perg
Students: Mike Strane, Emily Gurney, Eitan Shelef, Dylan Blummentritt
Collaborators: Alex Iriondo, Brad Singer, Sujoy Mukhopadhyay
Lesley
Eitan
Emily Mike
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Geodesy12 ± 2 mm/yr
Paleoseismology5 to 7 mm/yr (Estimate)
Central Mojave Transect
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Paleoseismic clusters from the ECSZ south of Barstow
From T. Rockwell, S. Lindvall, and C. Rubin
Well-constrained
Poorly-constrained
Earthquake Timing
Recent cluster began ~1000 ka
Average Earthquake Recurrence of 3 to 9 kyr
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Alluvial Fan Markers of Fault Slip
Active Wash Surface
Alluvial Fill
Abandoned Wash Surface
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Development of Alluvial Fan Stratigraphy
Desert Pavement
Soil Development
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Central Mojave Transect
Lenwood
Calico
Helendale
Camp Rock
Pisgah-Bullion
Ludlow
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Pipkin Cinder Cone 740±40 ka
Sheep Spring Wash
3 kmCalico Fault
Slip Rate Measurement
s
SRTM Topography
Area of LIDAR
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CalicoFault
Oskin et al. (2007)
Q2a
K
F
Q2b
Q1 B
QTcg
SlipRates
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Plio-Quaternary Growth Strata
Fanning Dips
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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
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Restorationof Q1 Fan
Displacement
900 ± 200 meters
Age: 650 ± 100 ka
1.4 ± 0.4 mm/yr
Today
~300 ka?
650 ka
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Cosmogenic Exposure Dating
qtz
ol
nn
X
+
10Be: t1/2 = 1.5 Myr
3He: stable, rare
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Q2b Fan Surface
Quartz and Basalt PebbleDesert Pavement
Quartz Monzonite & Basalt Boulders
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Cosmogenic Dates from Q2b Terrace and Modern Wash
0
50
100
150
200
250
300
Age
(ka
) Quartz Monzonite 10Be Basalt 3He
Boulders
Pavement
Wash Boulders
BouldersPavement
Wash Boulders
10Be Age - Inheritance: 56.4 ± 7.7 ka (2)
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Lithology-Dependent Hillslope Residence Time
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Restoration of Q2a Terrace Displacement
100 ± 10 meters 1.8 ± 0.3 mm/yr(95% confidence, Errors summed as root mean square)
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Central Mojave Transect
Lenwood
Calico
Helendale
Camp Rock
Pisgah-Bullion
Ludlow
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Lenwood FaultSlope Map: Darker = SteeperQ2b
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Slip Rate: 0.8 +0.2/-0.3 mm/yr
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Central Mojave Transect
Lenwood Fault
Calico Fault
Helendale Fault
Camp Rock Fault
Pisgah-Bullion Fault
Ludlow Fault
0.8 ± 0.2 mm/yr 1.8 ± 0.3 mm/yr
≤0.8 ± 0.2 mm/yr ≤1.4 ± 0.6 mm/yr ≤0.4 ± 0.2 mm/yr
Total: ≤6.1 ± 1.9 mm/yr
1.0 ± 0.2 mm/yr
(95% confidence, errors summed as root mean square,10Be production rate uncertainty added after summation)