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Related Experiment Videos

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
PubMed
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.

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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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