Rapid earthquake magnitude classification via P-wave strains from borehole strainmeters and Distributed Acoustic Sensing.

Figure 6a shows a strong correlation for both the borehole strainmeter and DAS data between the most important feature based on the SHAP scores (the maximum coefficient of the continuous wavelet transforms using the 3rd order Gaussian wavelets from 0.2–0.5 Hz), and maximum strain of the waveform in the first 4 s after the P -wave arrival, as well as a positive trend between higher values of those features and earthquake magnitude.

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