Royal Observatory of BelgiumSeismology & Gravimetry
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I felt an earthquake

Seismology

Gravimetry

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FAQ

Did you feel an earthquake?

Seismograms

Vertical ground motion recorded continuously by the stations of the Belgian seismic network. Each line represents thirty minutes; today’s record is extended every four minutes.

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Reading the seismogram

How to read the real-time seismogram

Preparing the animation…

1An endless strip

Animation drawn from the file shown by the page (one minimum and one maximum value per second); its values have no documented unit, so only ratios are given.

  1. Each line covers 30 minutes and reads from left to right; the (UTC) day reads from top to bottom.
  2. On the left, the UTC time at the start of the line; on the right, the Belgian time at the end of the line.
  3. Two shades alternate from one line to the next, so that a strong signal spilling over neighbouring lines can still be followed.
  4. Markers show the arrival time of the waves of listed events. Not everything visible is an earthquake: traffic, wind and human activity also shake the ground.