Seismometer self-noise estimation using a single reference instrument |
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Authors: | Izidor Tasi? Franc Runovc |
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Institution: | (1) Slovenian Environment Agency, Vojkova 1b, SI-1000 Ljubljana, Slovenia;(2) Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva c.12, SI-1000 Ljubljana, Slovenia |
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Abstract: | A new method is presented for the self-noise estimation of a seismometer using a single, side-by-side, reference instrument
and taking into consideration the misalignment in the orientation of both seismometers. The self-noise of seismometers is
extracted directly from the measurements without using any information relating to the transfer functions. This procedure
can be applied if the self-noise of the reference seismometer is well known and defined, or if the self-noise of the reference
seismometer is sufficiently below the self-noise of the tested instrument and can be neglected. The latter case applies to
this study. An algorithm is also developed where we apply self-noise data in order to determine the orientation misalignment
between two seismometers, which is then resolved in three-dimensional space. This new method provides an estimate of the self-noise
and can also be used to extract some parameters of the installed seismic system in comparison with the reference seismic system,
such as generator constants and seismometer orientation or to eliminate unwanted noise sources, which have their origin in
the seismic station’s design. The new technique was applied to the CMG-3ESPC and CMG-40T seismometers, where an STS-2 instrument
served as the reference seismometer. |
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