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Sitemap > Bulletin Board > Diplomarbeiten, Bachelor- und Masterarbeiten > Master thesis: Tidal analysis of tiltmeter time series
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Master thesis: Tidal analysis of tiltmeter time series

17.05.2021, Diplomarbeiten, Bachelor- und Masterarbeiten

Project description/Projektbeschreibung: The "G" ring laser operated at the Geodetic Observatory Wettzell is currently the only instrument which is able to monitor the variations of Earth rotation absolutely, i.e. without taking external objects like cosmic radio sources or satellites as a reference. In order to account for local tilt changes, which are noise for our purpose and should be removed, the orientation of the ring laser platform is monitored by a set of high accuracy tiltmeters. While the ring laser is sensitive to geometrical tilts only, the tiltmeters are also affected by horizontal attractional forces. For that reason, the attractional component of tidal tilts has to be removed before applying the tilts as a correction to the ring laser time series.

Aims of the project/Projektziele:
The aim of the project is to derive specific tiltmeter factors for different tidal frequencies. These factors describes local deviations from the nominal deformation due to the tidal potential plus the additional potential due to the shifted masses, which is expressed as the Love number k. This additional component has to be identified and removed from the tiltmeter data.
Time series from different tiltmeters over several years are provided. The series has to be cleaned for spikes, offsets and gaps, resampled to a uniform sample rate, and analysed using the Earth tide analysis software Eterna. The determined tiltmeter factors are then used to create model time series to correct the tiltmeters for the total tidal attraction and, finally, to apply the series to the G ring laser data.

Kontakt: martin.brandl@tum.de