WITHDRAWN Shallow Creep-Rate Variability Along on Northern California Faults From Alos-2 Insar Time Series
Description:
WITHDRAWN Alignment arrays across the Maacama Fault Zone (MFZ) indicate surface creep rates of ~5 mm/yr, similar in magnitude to the well studied Hayward Fault. However, further refinement of lateral variability in creep rates and near fault deformation is limited. Interferometry with ALOS-2 ScanSAR data provides a spatially continuous dataset that extends observations of crustal deformation into typically hard-to-reach places, including densely vegetated, snow-covered, and steep regions. We present analysis using both InSAR time series and average velocity fields to constrain lateral variability of shallow fault slip along Northern California faults [including the Maacama, Rodgers Creek, Bartlett Springs, Green Valley, and San Andreas faults].
We carefully examine cross-fault time series and fault perpendicular velocity profiles exploring shallow fault creep, near-fault vertical motions and far-field deformation. Cross-fault differencing mitigates much of the temporal (atmospheric) noise and provides a more accurate estimate of fault creep. Non-tectonic features such as landslides and hydrological deformation can bias these results. We assess anomalous creep-rate values by inspecting profiles of fault parallel and vertical velocity fields to determine whether they correlate with tectonic or non-tectonic deformation. We explore the correlation between vertical deformation and changes in fault geometry on near- and far-field scales. We use a simple 2D dislocation model constrained by surface creep rates and far field average velocity fields to estimate creep and locking depths and compare them to complementary datasets.
Session: From Earthquakes to Plate Boundaries: Insights Into Fault Behavior Spanning Seconds to Millennia [Poster]
Type: Poster
Date: 4/20/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Danielle Lindsay
Student Presenter: Yes
Invited Presentation:
Authors
Danielle Lindsay Presenting Author Corresponding Author danielle.lindsay@berkeley.edu University of California, Berkeley |
Roland Burgmann burgmann@berkeley.edu University of California, Berkeley |
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WITHDRAWN Shallow Creep-Rate Variability Along on Northern California Faults From Alos-2 Insar Time Series
Category
From Earthquakes to Plate Boundaries: Insights Into Fault Behavior Spanning Seconds to Millennia