Number | Name | Formula |
---|---|---|

1 | Duration | T=t_{e}−t_{s} |

2^{*} | MaxAmp | A=max[|s(t)|]·1000 |

3^{*} | DurOverAmp | T/A |

4 | RappMaxMean | max[e(t)]/mean[e(t)] |

5 | RappMaxMedian | max[e(t)]/median[e(t)] |

6^{*} | RappMaxStd | max[e(t)]/std[e(t)] |

7 | AsDec | (t_{max}−t_{s})/(t_{e}−t_{max}) |

8 | KurtoSig | Kurt[s(t)] |

9 | KurtoEnv | Kurt[e(t)] |

10 | SkewSig | Skew[s(t)] |

11 | SkewEnv | Skew[e(t)] |

12 | CorPeakNumber | Number of peaks in a(τ) |

13 | int_ratio | |

14–18 | ES1 to ES5 | ES_{i}=log_{10}∫e_{i}(t)dt |

19–23 | KurtoF1 to KurtoF5 | Kurt[s_{i}(t)] |

24 | MeanFFT | mean[|S(ν)|] |

25 | MaxFFT | max[|S(ν)|] |

26 | FMaxFFT | ν_{max} |

27 | MedianFFT | median[|S(ν)|] |

28 | VarFFT | var[|S(ν)|] |

29 | FCentroid | centroid[|S(ν)|] |

30 | Fquart1 | centroid[|S(ν)|_{1}] |

31 | Fquart3 | centroid[|S(ν)|_{3}] |

32 | NPeakFFT | Number of peaks in |S(ν)|>0.75|S(ν)|_{max} |

33 | MeanPeaksFFT | mean[|S(ν)|at peaks] |

34–37 | E1FFT to E4FFT | E_{i}FFT=∫|S(ν)|_{i}dν |

38 | gamma1 | |

39 | gamma2 | |

40 | gammas |

Description of terms: *s*(*t*) the windowed raw seismogram, *e*(*t*) its envelope, *a*(*τ*) its auto‐correlation function, *s*_{i}(*t*) the windowed seismograms filtered in the 0.1–1 Hz (*i*=1), 1–3 Hz (*i*=2), 3–10 Hz (*i*=3), 10–20 Hz (*i*=4), and 20–50 Hz (*i*=5) frequency bands, *e*_{i}(*t*) their corresponding envelopes, *t*_{s} and *t*_{e} the start and end times of the window, *t*_{max} the time of the peak amplitude, Kurt(*X*)=*μ*_{4}(*X*)/*σ*^{4}(*X*) the kurtosis of distribution *X* in which *μ*_{4}(*X*) indicates the fourth moment of *X* and *σ* its standard deviation, Skew(*X*)=*μ*_{3}(*X*)/*σ*^{3}(*X*) the Skewness of distribution *X* in which *μ*_{3} indicates the third moment of *X*, *S*(*ν*) the fast Fourier transform of *s*(*t*), *ν*_{max} the frequency at which |*S*(*ν*)| is maximum, and |*S*(*ν*)|_{i} the *i*th quartile of |*S*(*ν*)|.

↵* Features not also used by Hibert

*et al.*(unpublished manuscript, 2017; see Data and Resources).