How much can off-fault deformation contribute to the slip rate discrepancy within the eastern California shear zone?

Geology ◽  
2014 ◽  
Vol 42 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Justin W. Herbert ◽  
Michele L. Cooke ◽  
Michael Oskin ◽  
Ohilda Difo
Keyword(s):  
Shear Zone ◽  
Slip Rate ◽  
Eastern California Shear Zone ◽  
Fault Deformation

scholarly journals Incipient evolution of the Eastern California shear zone through the transpressional zone of the San Bernardino Mountains and San Gorgonio Pass, California

Geosphere ◽  
2020 ◽  
Vol 16 (4) ◽  
pp. 919-935
Author(s):  
William J. Cochran ◽  
James A. Spotila ◽  
Philip S. Prince
Keyword(s):  
Shear Zone ◽  
Slip Rate ◽  
San Bernardino Mountains ◽  
Eastern California Shear Zone ◽  
The North ◽  
San Bernardino ◽  
Geomorphic Features ◽  
Aerial Vehicle ◽  
Mountainous Landscape ◽  
High Topography

Abstract The nature of the connection between the Eastern California shear zone (ECSZ) and the San Andreas fault (SAF) in southern California (western United States) is not well understood. Northwest of San Gorgonio Pass, strands of the ECSZ may be migrating south and west into the convergent zone of the San Bernardino Mountains (SBM) as it is advected to the southeast via the SAF. Using high-resolution topography and field mapping, this study aims to test whether diffuse faults within the SBM represent a nascent connection between the ECSZ and the SAF. Topographic resolution of ≤1 m was achieved using both lidar and unmanned aerial vehicle surveys along two Quaternary strike-slip faults. The Lone Valley fault enters the SBM from the north and may form an along-strike continuation of the Helendale fault. We find that its geomorphic expression is obscured where it crosses Quaternary alluvium, however, suggesting that it may have a low rate of yet-undetermined activity. The Lake Peak fault is located farther south and cuts through the high topography of the San Gorgonio massif and may merge with strands of the SAF system. We find that this fault clearly cuts Quaternary glacial deposits, although the magnitude of offset is difficult to assess. Based on our interpretation of geomorphic features, we propose that the Lake Peak fault has predominantly dextral or oblique-dextral motion, possibly with a slip rate that is comparable to the low rates observed along other strands of the ECSZ (i.e., ≤1 mm/yr). Comparing the geomorphic expressions of these faults is difficult, however, given that the erosive nature of the mountainous landscape in the SBM may obscure evidence of active faulting. Based on these observations, as well as the occurrence of other diffuse faults in the region, we suggest that dextral strain is overprinting the actively convergent zone of the SBM, thereby creating a throughgoing connection between the ECSZ and the SAF west of San Gorgonio Pass.

scholarly journals Slip rate of the Calico fault: Implications for geologic versus geodetic rate discrepancy in the Eastern California Shear Zone

2007 ◽  
Vol 112 (B3) ◽  
Author(s):  
Michael Oskin ◽  
Lesley Perg ◽  
Dylan Blumentritt ◽  
Sujoy Mukhopadhyay ◽  
Alexander Iriondo
Keyword(s):  
Shear Zone ◽  
Slip Rate ◽  
Eastern California Shear Zone

A new geological slip rate estimate for the Calico Fault, eastern California: implications for geodetic versus geologic rate estimates in the Eastern California Shear Zone

2018 ◽  
Vol 61 (13) ◽  
pp. 1613-1641 ◽  
Author(s):  
Surui Xie ◽  
Elisabeth Gallant ◽  
Paul H. Wetmore ◽  
Paula M. Figueiredo ◽  
Lewis A. Owen ◽  
...  
Keyword(s):  
Shear Zone ◽  
Slip Rate ◽  
Rate Estimate ◽  
Eastern California Shear Zone

Geodetic slip rate for the eastern California shear zone and the recurrence time of Mojave desert earthquakes

Nature ◽  
1994 ◽  
Vol 367 (6460) ◽  
pp. 264-266 ◽  
Author(s):  
Jeanne Sauber ◽  
Wayne Thatcher ◽  
Sean C. Solomon ◽  
Michael Lisowski
Keyword(s):  
Shear Zone ◽  
Mojave Desert ◽  
Slip Rate ◽  
Recurrence Time ◽  
Eastern California Shear Zone

NEW LONG AND INTERMEDIATE RANGE SLIP RATES FOR THE CENTRAL CALICO FAULT OF THE EASTERN CALIFORNIA SHEAR ZONE

2016 ◽  
Author(s):  
Paul Wetmore ◽  
◽  
Lewis A. Owen ◽  
Timothy H. Dixon ◽  
Surui Xie ◽  
...  
Keyword(s):  
Shear Zone ◽  
Slip Rates ◽  
Intermediate Range ◽  
Eastern California Shear Zone
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