The following pictures show the actual measurements made at the Sprengnether Seismograph. These pictures are updated every 10 minutes. The sampling rate is set to 6.25 Hz.
Date of the shown diagrams:

• Original data; tension measured at the Seismograph at an interval of 15 minutes. Partly, the proper period of the seismograph of about 20 seconds is visible in the following data.

• Passfilter for high frequencies (1 Hz to 3 Hz) (digital filter: Butterworth 3. order)

• Passfilter for low frequencies (0.05 Hz to 0.5 Hz) (digital filter: Butterworth 3. order)