Seismograms were filtered by an SRO-simulation filter. All three vector components are displayed (Z: blue; N: green; E: red). During daytime several heavy lorries have passed the seismometer vault on their way to the summit and back. Large amplitudes correspond to heavy load lorries travelling upwards (signal onset is first on E-component). Smaller amplitudes correspond to unloaded lorries travelling back (signal onset is first on N-component).

The NEIC-location of the earthquake-signal is: 2001/11/15 01:03:05 1.77S 15.46W 10.0km M6.3 B NORTH OF ASCENSION ISLAND.

The signals shown here are discussed by

• T. Forbriger, 2002. Magnetfeld-Signale in seismischen Registrierungen. 28. Treffen der AG Seismologie, Potsdam. (PDF 3MB)