Fig. 4

Example of low-frequency and trend-compensated broadband seismogram and estimated displacement; (a) original east-west component seismogram recorded at the KSN site, (b) frequency-compensated seismogram (black line) and estimated trend signal (red line), (c) derivative of estimated trend signal shown by a red line in (b), (d) piecewise linear trend model (black line) used for trend compensation in the seismogram shown in (b) and linear fit (red line) to the estimated trend signal shown in (b), (e) frequency- and trend-compensated seismogram, and (f) displacement seismogram calculated from the velocity seismogram shown in (e).