Room: Ballroom
Date: 4/18/2023
Session Time: 8:00 AM to 5:45 PM (local time)
Normal Faults: From Source to Surface
High-resolution earthquake-related surface displacement measurements from optical data or field studies are useful to determine co-seismic off-fault deformation. These data serve as an input into fault-slip inversion studies and to validate dynamic rupture models, rendering the measurements of surface displacement a proxy for the fault structure at depth.
While this approach can be valid in the strike-slip setting, many earthquakes occur on basin-bounding normal faults where most of the damage is concealed by the sedimentary deposits. In addition, inherent asymmetry of normal dipping faults has been shown to lead to distinct dynamic rupture behaviours, such as reduced or enhanced shallow coseismic slip. The resulting surface deformation may, therefore, reflect the propagation of the rupture through the basin-fill rather than the basement rocks, potentially altering the style and the magnitude of the final displacement.
To relate the surface deformation to the subsurface structure of normal faults, we aim to explore the connection between the surface deformation created by large-magnitude normal events and the geometry of the associated subsurface structures. In this session, we would like to bring together studies which collect high-resolution measurements of surface displacement from remote sensing, subsurface geophysics, as well as kinematic and dynamic rupture models and laboratory experiments. We hope to address the question of how representative the surface deformation created during normal earthquakes is of the subsurface structure of normal fault zones.
Conveners
Lucia Andreuttiova, University College London (lucia.andreuttiova.16@ucl.ac.uk)
Thomas M. Mitchell, University College London (tom.mitchell@ucl.ac.uk)
Alice-Agnes Gabriel, University of California San Diego, LMU Munich (alice-agnes.gabriel@geophysik.uni-muenchen.de)
Zachary E. Ross, Caltech (zross@caltech.edu)
Poster Presentations
| Participant Role | Details | Action |
|---|---|---|
| Submission | The Rocks That Did Not Fall: A Multidisciplinary Analysis of Near-Source Ground Motions From an Active Normal Fault | View |
| Submission | A Semi-Automated Algorithm for Fault Displacement Profile Extraction | View |
| Submission | Across-Scales Co-Seismic Deformation and Fault Scarp Morphology From the 1954 Dixie Valley-Fairview Peak Earthquake Sequence | View |
Normal Faults: From Source to Surface [Poster]
Description