λ″-based instability detection and classification

This repository provides a reproducible implementation of the workflow used in our study to (i) detect candidate frictional instabilities from the second derivative of the seismicity rate, λ″(t), and (ii) confirm/score each candidate using independent physical diagnostics (rate, energy, space, and magnitude statistics). The code corresponds to the Methods/Supplement sections: - **S2.2 Detection of λ″(t) peaks and threshold robustness**- **S3 Independent physical criteria for confirming instability**