Publication Date:
2002-01-01
Description:
The mechanical, automatically recording seismological instruments developed by Emil Wiechert in Göttingen at the beginning of the 20th century are still in use today. I compare the recording characteristics of these seismographs with a modern, electrodynamic MARK L4-3D instrument. The frequency-dependent transfer functions are determined and used to restitute the 'true' ground displacement. The displacement waveforms at the different instruments are well correlated at frequencies between 0.05 and 4.0 Hz. Amplitudes differ by a factor of less than two. This is sufficient for the determination of seismological magnitudes which are defined on a logarithmic basis. The timing accuracy is less favourable due to the slow recording speed on the smoked paper. However, relative time differences within one second may be resolved, allowing the use of various modern seismological interpretation techniques.
Print ISSN:
1383-4649
Electronic ISSN:
1573-157X
Topics:
Geosciences
,
Physics
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