Troubleshooting Seiscomp Issues with a Closely Spaced Network of Stations

If you’re working with a closely spaced network of seismic stations and experiencing issues with Seiscomp, you’re not alone. Many seismologists face similar challenges when configuring Seiscomp for networks with high station density. In this blog post, we’ll discuss common issues and offer practical solutions to optimize Seiscomp’s performance.

Common Issues Observed in Seiscomp with Closely Spaced Networks

Seiscomp Autopick Limitations:

• P-Phases Detected but Not S-Phases: The autopicker successfully detects P-phases but fails to pick up S-phases or other phases.
• Minor Timing Differences: Picked phases at each station differ by only a few milliseconds.
• High Amplitude P-Picks: The P-picks start from a much higher amplitude instead of the first arrival.
• Lack of Automatic Phase Association: When manually associating P-phases, errors like “solution did not converge” or “data is insufficient” are encountered.
• Inactive Picker Button: Manual picking is restricted as the picker button remains inactive without phase association.

Challenges in Event Location:

• Manual Phase Association: Providing a rough nearby event location and time sometimes enables phase association, but errors persist.
• Imprecise Event Location: Even with phase association, the event location is not precise, and residuals need to be reduced for better accuracy.

Solutions and Recommendations

To address these issues, consider the following strategies:

Network Configuration:

• Verify Station Coordinates: Double-check that all station coordinates are accurate and correctly configured in Seiscomp.
• Adjust Network Parameters: Fine-tune the network parameters in Seiscomp to better accommodate the closely spaced stations.

Phase Picking and Association:

• Adjust Picking Parameters: Modify the picking parameters to be more sensitive to lower amplitude P-wave arrivals. This involves tweaking the configuration files, particularly focusing on thresholds and filters used for phase detection.
• Increase Picking Window: Expand the picking window to ensure that S-phases and other phases are detected.
• Cross-Correlation: Implement cross-correlation techniques to improve the consistency of phase picks across the closely spaced stations.

Data Quality and Preprocessing:

• Signal-to-Noise Ratio: Evaluate the signal-to-noise ratio for each station. High noise levels can impede accurate phase picking.
• Filtering: Apply suitable filters to the data to enhance the P- and S-phase arrivals.
• Amplitude Thresholds: Adjust the amplitude thresholds for phase picking to ensure the picks start from the first arrival rather than higher amplitudes.

Manual Adjustments and Event Location:

• Initial Rough Location: Provide an initial rough event location and time to aid the process. Ensure the parameters are as accurate as possible.
• Reduce Residuals: Manually adjust picks after initial phase association to reduce residuals and improve event location accuracy.
• Review and Pick Additional Phases: Manually review the data to pick additional phases that the automatic picker might have missed. This can enhance overall phase association and event location precision.

Algorithm and Software Configuration:

• Review Configuration Files: Thoroughly review and adjust Seiscomp’s configuration files, optimizing them for closely spaced networks.
• Consult Documentation: Refer to Seiscomp’s documentation and community forums for specific parameters and settings that can improve performance for closely spaced networks.

Troubleshooting Errors:

• Solution Did Not Converge: This error might indicate issues with initial parameters or insufficient data quality. Ensuring high-quality data and accurate initial parameters can help.
• Data is Insufficient: Confirm that there is adequate data coverage and that all stations are operational and correctly configured.

By systematically addressing these aspects, you can improve Seiscomp’s performance with your closely spaced network and achieve more accurate phase picking and event locations.

About QuakeLogic

QuakeLogic is a leading provider of advanced seismic monitoring solutions, offering a range of products and services designed to enhance the accuracy and efficiency of seismic data acquisition and analysis. Our innovative technologies and expert support help organizations worldwide to better understand and mitigate the impacts of seismic events.

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