Figure S4. Comprehensive analysis of anomalous stations with instrument self-noise (no record in a certain channel of the station). (a) Repeating eathquake records of abnormal station HI.BSH. (b) Waveform cross-correlation images of the same repeating seismic pair at other stations within 100 km of the station HI.BSN at BHZ channel. The red curves represent the records of March 20th 2021 earthquake (Mw=7.0) at different stations, while the May 1st, 2021 earthquake (Mw=6.9) waveforms are shown with blue lines. At the far right of each station are the cross-correlation and scale factor for the repeating earthquakes, respectively..