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Resolving Fine-Scale Heterogeneity of Co-seismic Slip and the Relation to Fault Structure
C W D Milliner1, C Sammis1, A A Allam2
1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA.
Scientific Reports
|June 4, 2016
Summary
Earthquake fault slip patterns correlate with fault geometry. Complex faults exhibit rougher slip, while simpler faults show smoother slip, impacting seismic hazard assessments.
Area of Science:
- Geophysics
- Seismology
- Earthquake Science
Background:
- Fault slip distributions are crucial for understanding earthquake mechanics.
- Previous studies have not fully elucidated the relationship between fault geometry and slip patterns.
Purpose of the Study:
- To analyze co-seismic slip profiles of the Landers and Hector Mine earthquakes.
- To investigate the correlation between slip distribution and fault geometrical structure.
- To understand the influence of fault complexity on earthquake rupture behavior.
Main Methods:
- High-resolution analysis of along-strike co-seismic slip profiles.
- Spectral analysis to assess slip variation characteristics.
- Correlation analysis between slip variability and fault geometry.
Main Results:
- A spatial correlation was found between slip distribution fluctuations and geometrical fault structure.
- Co-seismic slip variation exhibits self-affine fractal properties, with Landers being rougher than Hector Mine.
- Slip variability wavelength and amplitude correlate with fault geometrical complexity.
Conclusions:
- Fault complexity induces heterogeneous stress, controlling co-seismic slip.
- The relationship between fault structure and earthquake rupture behavior is fundamental.
- Findings aid in modeling realistic slip profiles for seismic hazard and paleoseismology.
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