738,000 Years of Off-fault Damage at the Volcanic Tablelands
Measurements of the cumulative deformation history of a fault are challenged by incomplete knowledge of pre-faulted markers, sparse data coverage and limited chronologies. Using recently collected high-resolution lidar data of the Volcanic Tablelands in California, we image and analyze zones of permanent deformation associated with flexure of the hanging wall and footwall of normal faults cutting through the Bishop Tuff. High strains are localized to narrow symmetric zones (50-300 m) surrounding faults. These zones have average bending strains of ~10-2 and exhibit constant width along most of the fault length, narrowing at the fault tips. The extent of off-fault deformation is independent of the thickness of the faulted unit, which decreases from ~100 m to ~60 m from east to west. Instead, the width of high-intensity off-fault deformation scales with fault throw following a power-law. Our observations suggest that the extent of off-fault flexural folding is rheologically controlled and directly constrains the area of influence of off-fault plastic processes.
Session: Fault Damage Zones: What We Know and Do Not II
Type: Oral
Room: Grand A
Date: 4/20/2022
Presentation Time: 05:30 PM Pacific
Presenting Author: Alba M. Rodriguez Padilla
Student Presenter: Yes
Additional Authors
Alba Rodriguez Padilla Presenting Author Corresponding Author arodriguezpadilla@ucdavis.edu University of California, Davis |
Michael Oskin meoskin@ucdavis.edu University of California, Davis |
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738,000 Years of Off-fault Damage at the Volcanic Tablelands
Category
Fault Damage Zones: What We Know and Do Not
Description