scholarly journals How fault evolution changes strain partitioning and fault slip rates in Southern California: Results from geodynamic modeling

2017 ◽  
Vol 122 (8) ◽  
pp. 6893-6909 ◽  
Author(s):  
Jiyang Ye ◽  
Mian Liu
Keyword(s):  
Southern California ◽  
Fault Slip ◽  
Strain Partitioning ◽  
Slip Rates ◽  
Fault Slip Rates ◽  
Fault Evolution

scholarly journals New geodetic constraints on southern San Andreas fault-slip rates, San Gorgonio Pass, California

Geosphere ◽  
2020 ◽  
Author(s):  
Katherine A. Guns ◽  
Richard A Bennett ◽  
Joshua C. Spinler ◽  
Sally F. McGill
Keyword(s):  
Velocity Field ◽  
Southern California ◽  
San Andreas Fault ◽  
Plate Boundary ◽  
Slip Rate ◽  
Fault Slip ◽  
Slip Rates ◽  
San Andreas ◽  
Fault Slip Rates ◽  
Gps Velocity Field

Assessing fault-slip rates in diffuse plate boundary systems such as the San Andreas fault in southern California is critical both to characterize seis­mic hazards and to understand how different fault strands work together to accommodate plate boundary motion. In places such as San Gorgonio Pass, the geometric complexity of numerous fault strands interacting in a small area adds an extra obstacle to understanding the rupture potential and behavior of each individual fault. To better understand partitioning of fault-slip rates in this region, we build a new set of elastic fault-block models that test 16 different model fault geometries for the area. These models build on previ­ous studies by incorporating updated campaign GPS measurements from the San Bernardino Mountains and Eastern Transverse Ranges into a newly calculated GPS velocity field that has been removed of long- and short-term postseismic displacements from 12 past large-magnitude earthquakes to estimate model fault-slip rates. Using this postseismic-reduced GPS velocity field produces a best- fitting model geometry that resolves the long-standing geologic-geodetic slip-rate discrepancy in the Eastern California shear zone when off-fault deformation is taken into account, yielding a summed slip rate of 7.2 ± 2.8 mm/yr. Our models indicate that two active strands of the San Andreas system in San Gorgonio Pass are needed to produce sufficiently low geodetic dextral slip rates to match geologic observations. Lastly, results suggest that postseismic deformation may have more of a role to play in affecting the loading of faults in southern California than previously thought.

scholarly journals Strain partitioning and fault slip rates in the northeastern Caribbean from GPS measurements

2002 ◽  
Vol 29 (18) ◽  
pp. 3-1-3-4 ◽  
Author(s):  
Eric Calais ◽  
Yves Mazabraud ◽  
Bernard Mercier de Lépinay ◽  
Paul Mann ◽  
Glen Mattioli ◽  
...  
Keyword(s):  
Fault Slip ◽  
Strain Partitioning ◽  
Gps Measurements ◽  
Slip Rates ◽  
Fault Slip Rates

Fault interaction and strain partitioning in southeastern Tibetan Plateau: from kinematics to geodynamics

2020 ◽  
Author(s):  
Li Yin
Keyword(s):  
Tibetan Plateau ◽  
Fault Slip ◽  
Fault System ◽  
Strain Partitioning ◽  
Fault Interaction ◽  
Slip Rates ◽  
Southeastern Tibetan Plateau ◽  
Fault Systems ◽  
Fault Strength ◽  
Fault Slip Rates

<p>In southeastern Tibetan Plateau, the Xianshuihe-Xiaojiang fault system (XXFS) and its neighboring fault systems collectively accommodates the material extrusion of the Tibetan Plateau. However we do not mechanically understand how these faults interact with each other and how the fault interaction impacts strain partitioning, fault slip rates, and seismicity in this region. We develop and use a three-dimensional viscoelastoplastic finite element model to simulate regional deformation, fault slip rates, and fault interaction in the fault system of southeastern Tibetan Plateau. We investigate the effects of inception and activity of faults, fault strength, lithospheric rheology, and topography on partitioning of strain and fault slip rates. Model results show that fault strength, lithospheric rheology, and topography all significantly influence the strain partitioning and slip rates on faults. The initiation of the Daliangshan fault results mainly from the non-smooth fault geometry of the main trace of the XXFS. Our model results support the hypothesis of codependent slip rate between fault systems. For the present fault configuration, our model predicts localized strain in the Daliangshan faults, Yingjing-Mabian faults, and Lianfeng-Zhaotong faults, where numerous earthquakes occurred in recent years.</p>

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