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Repeating seismic events in China.
David P Schaff1, Paul G Richards
1Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA. dschaff@ldeo.columbia.edu
Science (New York, N.Y.)
|February 21, 2004
Summary
Approximately 10% of seismic events near China are repeating, occurring within 1 km of each other. This study improved earthquake location precision for better seismic hazard analysis and verification.
Area of Science:
- Geophysics
- Seismology
- Earthquake Science
Background:
- Repeating seismic events are crucial for understanding earthquake physics and improving seismic hazard assessments.
- Accurate event location is vital for distinguishing natural earthquakes from underground nuclear tests.
Purpose of the Study:
- To identify and analyze repeating seismic events in and near China from 1985 to 2000.
- To enhance the precision of earthquake and explosion locations using seismogram cross-correlation.
Main Methods:
- Cross-correlated seismograms from approximately 14,000 seismic events (earthquakes and explosions).
- Measured relative arrival times to a precision of 0.01 second.
- Achieved lateral location precision of 100 to 300 meters for repeating events.
Main Results:
- Identified that about 10% of seismic events in the study region were repeating events, located within 1 km of each other.
- Demonstrated significant improvement in location specificity compared to standard methods.
- Quantified the inaccuracy of current event timing and location procedures.
Conclusions:
- High-precision locations of repeating seismic events offer valuable insights into earthquake physics.
- Improved location accuracy supports more reliable seismic hazard studies and nuclear test ban verification.
- The methodology highlights limitations in current seismic data processing techniques.
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