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Titel |
New Portable Mechanical Sensor System for Rotational Seismic Motion Measurements |
VerfasserIn |
Johana Brokesova, Jiří Málek |
Konferenz |
EGU General Assembly 2010
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 12 (2010) |
Datensatznummer |
250036897
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Zusammenfassung |
A new mechanical sensor system for recording the rotational components of ground velocity
in a horizontal plane has been constructed. It was tested both in a laboratory and in a field
experiment. The sensor system is based on measurements of differential motions between
paired sensors mounted along the perimeter of a rigid (undeformable) disc. The elementary
sensors creating the pairs are sensitive low-frequency geophones with equal frequency
response. The main features of the new rotational seismic sensor system is a flat frequency
characteristic in the wide range from 1 Hz to 200 Hz and sensitivity limit of the order of 10-8
rad/s. Notable advantages are small dimensions, portability, easy installation and
operation in the field. An important feature of the instrument is that it provides
records of translational seismic motions together with rotations, which allows many
important seismological applications. We have used the new sensor system to record the
rotation velocity in a horizontal plane due to a small earthquake of ML=2.2, which
occurred within the earthquake swarm in Western Bohemia in autumn 2008. We
found good agreement of the rotation record with the transverse acceleration, as
predicted by theory. This measurement demonstrates that this device has a much wider
application than just prospecting measurements, for which it was originally designed. |
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