Fig. 2

Frequency response characteristics of VSE355G3 broadband seismometer and compensation filter used in this study; relative velocity response of VSE355G3 seismometer against input acceleration (dotted red line), that against input velocity (dotted black line), inverse frequency response of VSE355G3 seismometer (red line), 144 dB level (blue line) and frequency response of digital compensation filter used in this study (black line) with a sampling time of 1/ΔT = 0.05 s.