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Repeating microearthquake sequences interact predominantly through postseismic slip
Semechah K Y Lui1, Nadia Lapusta1,2
1Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, MC 252-21, 1200 E California Boulevard, Pasadena, California 91125, USA.
Nature Communications
|October 6, 2016
Summary
Interactions between repeating earthquakes are dominated by postseismic creep, not static stress. This finding expands the understanding of earthquake triggering and fault friction properties.
Area of Science:
- Geophysics
- Seismology
- Earth Science
Background:
- Repeating earthquakes offer insights into fault physics and friction.
- Interactions between nearby repeating earthquake sequences are observed, but the mechanisms are debated.
- Static stress changes from seismic slip are the conventionally assumed cause of these interactions.
Purpose of the Study:
- To investigate the interaction mechanisms between repeating earthquakes using advanced simulation methods.
- To compare different types of stress transfer influencing repeating earthquake sequences.
- To explore the role of postseismic creep in earthquake interactions.
Main Methods:
- Utilized rate-and-state fault models for earthquake simulations.
- Employed state-of-the-art simulation techniques to reproduce seismic events and long-term sequences.
- Compared various stress transfer mechanisms between repeating earthquake events.
Main Results:
- Postseismic creep was found to be the dominant factor in repeating earthquake interactions.
- Earthquake triggering was observed to occur at significantly larger distances than previously assumed.
- The study highlights the substantial influence of aseismic slip on earthquake interactions.
Conclusions:
- Postseismic creep plays a critical role in the interaction of repeating earthquake sequences.
- The findings suggest that repeating earthquake interactions can be used to better constrain friction properties of creeping fault segments.
- This research advances the understanding of fault behavior and earthquake predictability.
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