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Automated microseismic event location using Master-Event Waveform Stacking.

Francesco Grigoli¹, Simone Cesca², Lars Krieger³

¹National Institute of Oceanography and Experimental Geophysics (OGS), Trieste, Italy.

Scientific Reports

|May 18, 2016

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Accurate microseismic event location is crucial but challenging due to weak signals. This study introduces a new waveform stacking method using source-specific station corrections to improve event location accuracy, even with imprecise velocity models.

Area of Science:

Seismology
Geophysics

Background:

Microseismic event location is vital for seismological and industrial applications.
Weak seismic signals and low signal-to-noise ratios pose significant challenges.
Traditional methods lack station coherency information, while full-waveform methods depend heavily on accurate velocity models.

Purpose of the Study:

To develop an improved microseismic event location method.
To mitigate the dependency on accurate velocity models in waveform-based location.
To enhance location robustness for weak seismic signals.

Main Methods:

Developed an improved waveform stacking location method incorporating source-specific station corrections.
Exploited waveform coherency across multiple stations.

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Restricted the influence of velocity model inaccuracies to travel times within the seismogenic volume.

Main Results:

The new method successfully improved microseismic event location accuracy.
Demonstrated reduced dependency on precise velocity models.
Validated the approach using both synthetic and real seismic data.

Conclusions:

The proposed method offers a robust solution for microseismic event location.
It enhances accuracy and reduces reliance on detailed velocity models.
This advancement is applicable to seismological and industrial monitoring.