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Real-Time Seismograms

The following figures show seismograms recorded by the monitoring stations in the Yverdon-les-Bains area. The seismograms represent the development of ground motion (vibration velocity) over time, recorded at earthquake stations CAMBL, ONNEN, BAULM, OPENS within the past five and the last twenty minutes, respectively.

The times indicated on the horizontal axes correspond to Coordinated Universal Time (UTC). The time normally used in Switzerland is Central European Time (CET), which isone hour later than UTC. During Central European Summer Time (CEST), Swiss time is two hours ahead of GMT.

The vertical axes indicate ground velocities in micronsper second (μm/s). To make small, locally occurring earthquakes more clearly visible, the seismograms are band-pass filtered (from 2 to 10 Hz) before being presented.

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Fig 2. Alarming perimeter for the Malménergie Naturelle SA project.