Across-Scales Co-Seismic Deformation and Fault Scarp Morphology From the 1954 Dixie Valley-Fairview Peak Earthquake Sequence
Description:
The 1954 Dixie Valley -Fairview Peak earthquake sequence ruptured along a series of normal and strike-slip faults, creating a complex pattern of surface deformation. The displacement created during large-magnitude earthquakes is often used as an input into hazard forecast models and as a proxy to estimate the earthquake magnitude. Therefore, to verify its accuracy we compare the measurements of surface displacement collected from several sources.
In this work, we use data from optical image correlation (OIC), high-resolution digital elevation models (DEM) constructed using images from an unmanned aerial vehicle (UAV), and field measurements published in previous work. The results of this study show that the displacement estimated from the high-resolution UAV DEM exceeds the measurements from the other two data sets. Furthermore, the measurements collected in the field are slightly higher than the offset determined from optical image correlation. Such results are inconsistent with previously published work. The displacement measurements from optical image correlation span across a long aperture and include the deformation distributed away from the main fault. Therefore, the data collected from OIC typically exceed the measurements collected in the field.
We believe that there are several mechanisms responsible for this discrepancy. Firstly, the fault scarp in the unconsolidated material reaches the angle of repose through erosion and deposition while simultaneously cutting into the steeply dipping topography. Secondly, the change in the fault's subsurface geometry causes higher subsidence close to the fault scarp. Therefore, the results of this study suggest that field data should be carefully evaluated.
Session: Normal Faults: From Source to Surface [Poster]
Type: Poster
Date: 4/18/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Lucia Andreuttiova
Student Presenter: Yes
Invited Presentation:
Authors
Lucia Andreuttiova Presenting Author Corresponding Author lucia.andreuttiova.16@ucl.ac.uk University College London |
James Hollingsworth james.hollingsworth@univ-grenoble-alpes.fr University Grenoble Alpes, University Savoie Mont Blanc, Centre National de la Recherche Scientifique, Institut de Recherche pour le Développement, University Gustave Eiffel, ISTerre |
Pieter Vermeesch p.vermeesch@ucl.ac.uk University College London |
Tom Mitchell tom.mitchell@ucl.ac.uk University College London |
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Across-Scales Co-Seismic Deformation and Fault Scarp Morphology From the 1954 Dixie Valley-Fairview Peak Earthquake Sequence
Category
Normal Faults: From Source to Surface