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| Titel |
Examining ambient noise using co-located measurements of rotational and translational motion |
| VerfasserIn |
C. Hadziioannou, P. Gaebler, U. Schreiber, J. Wassermann, H. Igel |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062940
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| Zusammenfassung |
| In the past decade a number of studies have reported the observation of rotational motion
associated with seismic events. We report a first observation of rotational motion in the
microseismic ambient noise band. A striking feature of rotational motion measurements is
that the information about the seismic phase velocity and source backazimuth is contained in
the amplitude ratio of a point measurement of rotation rate and transverse acceleration. We
investigate the possibility of applying this method to ambient noise measured with a ring laser
and a broadband seismometer at the Wettzell geodetic observatory in Germany.
Using data in the secondary microseismic band, we recover local phase velocities
as well as the backazimuth of the strongest noise source for two different time
periods. In order to confirm these findings we additionally compare the results
with classical array processing techniques of the nearby located Gräfenberg array. |
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