The next challenge is to be able to actually record the signals from the seismometer
and not loose quality. Analog recording is still used (Figure 1.6) since it gives a very fast and
easy overview of the seismicity. However, the dynamic range is very limited (at most 200 in
contrast to 108
). Analog recorders are very expensive to buy and operate, so they are rarely
installed anymore. In addition, few seismic recorders give out an analog signal required of the
recorders so an additional digital to analog converter must be installed.