Noise classification for the unified earthquake catalog using ensemble learning: the enhanced image of seismic activity along the Japan Trench by the S-net seafloor network

Earth, Planets and Space

Table 2 Types of features

Features
t₀	Elapsed time of origin time from 00:00 (s)
lat	Latitude (°)
lon	Longitude (°)
dep	Depth (km)
M	Magnitude (no unit)
σ_t	Origin time error (s)
σ_lat	Latitude error (min)
σ_lon	Longitude error (min)
σ_dep	Depth error (km)

Features
N_pⁱ	Cumulative number of P-phase
N_sⁱ	Cumulative number of S-phase
N_psⁱ	Cumulative number of P-phase and S-phase
Dⁱ	Epicentral distance (km)
θⁱ	Back azimuth (°)
r_pⁱ	Residual of P-phase (s)
r_sⁱ	Residual of S-phase (s)
r_mⁱ	Residual of magnitude (no unit)
σ_pⁱ	Root mean square of P-phase residual (s)
σ_sⁱ	Root mean square of S-phase residual (s)
σ_mⁱ	Root mean square of magnitude residual (no unit)

i indicates the station index in the order of location closest to the hypocenter \(\left(i=1, \dots , 20\right)\), including stations in which no phase was read