seismic-picker-selection - SKILL.md Agent Skill

name: seismic-picker-selection description: This is a summary the advantages and disadvantages of earthquake event detection and phase picking methods, shared by leading seismology researchers at the 2025 Earthquake Catalog Workshop. Use it when you have a seismic phase picking task at hand.

When choosing an event detection and phase picking method, consider these key tradeoffs:

Method	Generalizability	Sensitivity	Speed, Ease-of-Use	False Positives
STA/LTA	High	Low	Fast, Easy	Many
Manual	High	High	Slow, Difficult	Few
Deep Learning	High	High	Fast, Easy	Medium
Template Matching	Low	High	Slow, Difficult	Few

Key insight: Each method has strengths and weaknesses. Purpose and resources should guide your choice.

Runs very fast: Automatically operates in real-time
Easy to understand & implement: Can optimize for different window lengths and ratios
No prior knowledge needed: Does not require information about earthquake sources or waveforms
Amplitude-based detector: Reliably detects large earthquake signals

Optimally sensitive detector (more sensitive than deep-learning): Can find smallest earthquakes buried in noise, if similar enough to template waveform
Excellent for improving temporal resolution of earthquake sequences
False detections are not as concerning when using high detection threshold

Requires prior knowledge about earthquake sources: Need template waveforms with good picks from a preexisting catalog
Does not improve spatial resolution: Unknown earthquake sources that are not similar enough to templates cannot be found
Setup effort required: Must extract template waveforms and configure processing
Computationally intensive

Adds most value when existing seismic networks are sparse or nonexistent
Automatically and rapidly create more complete catalog during active sequences
Requires continuous seismic data
Best on broadband stations, but also produces usable picks on accelerometers, nodals, and Raspberry Shakes
Use case: Temporary deployment of broadband or nodal stations where you want an automatically generated local earthquake catalog

No prior knowledge needed about earthquake sources or waveforms
Finds lots of small local earthquakes (lower magnitude of completeness, Mc) with fewer false detections than STA/LTA
Relatively easy to set up and run: Reasonable runtime with parallel processing. SeisBench provides easy-to-use model APIs and pretrained models.

Out-of-distribution data issues: For datasets not represented in training data, expect larger automated pick errors (0.1-0.5 s) and missed picks
Cannot pick phases completely buried in noise - Not quite as sensitive as template-matching
Sometimes misses picks from larger earthquakes that are obvious to humans, for unexplained reason

Deep learning pickers are a strong default for this task, but treat the first full catalog as a candidate, not the stopping point.
If association finishes but the evaluator shows much lower precision than recall, do one retune pass before changing methods.
First retune the picker thresholds upward (for example, move PhaseNet P and S thresholds from a recall-first setting like 0.3 toward 0.4-0.5).
Only after that should you tighten association settings such as min_picks_per_eq or min_stations.

This skill is a derivative of Beauce, Eric and Tepp, Gabrielle and Yoon, Clara and Yu, Ellen and Zhu, Weiqiang. Building a High Resolution Earthquake Catalog from Raw Waveforms: A Step-by-Step Guide Seismological Society of America (SSA) Annual Meeting, 2025. https://ai4eps.github.io/Earthquake_Catalog_Workshop/
Allen (1978) - STA/LTA method
Perol et al. (2018) - Deep learning for seismic detection
Huang & Beroza (2015) - Template matching methods
Yoon and Shelly (2024), TSR - Deep learning vs template matching comparison