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Predicting the endpoints of earthquake ruptures
1Center for Neotectonic Studies, Mail Stop 169, University of Nevada, Reno, Nevada 89557, USA. stevew@seismo.unr.edu
Nature
|November 17, 2006
Summary
Earthquake ruptures often stop at fault steps, which act as barriers to propagation. A critical fault step size of 3-4 km limits rupture length, impacting seismic hazard assessments.
Area of Science:
- Geology
- Seismology
- Earthquake Science
Background:
- Earthquake ruptures propagate along active fault traces.
- Fault traces are frequently discontinuous, featuring steps that can influence rupture propagation.
Purpose of the Study:
- To investigate the role of fault discontinuities in limiting earthquake rupture length.
- To identify a critical fault step dimension that impedes rupture propagation.
Main Methods:
- Analysis of mapped surface rupture traces from 22 historical strike-slip earthquakes.
- Statistical examination of the relationship between rupture endpoints and fault step characteristics.
Main Results:
- Approximately two-thirds of strike-slip earthquake rupture endpoints coincide with fault steps or fault termini.
- A limiting fault step dimension of 3-4 km was identified, above which ruptures rarely propagate.
- Below this critical dimension, rupture propagation ceased approximately 40% of the time.
Conclusions:
- Fault steps play a crucial role in controlling earthquake rupture length.
- The identified critical fault step dimension is vital for seismic hazard analysis and understanding earthquake dynamics.
- The limiting dimension is largely independent of the overall earthquake rupture length, suggesting consistent stress change dynamics at rupture fronts.
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