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Comparison of Tilt and SG-Gravity Residuals at Conrad Observatory (Austria)

This study presents a comparison between tilt and gravity residuals observed at the Conrad Observatory in Austria. The analysis includes data processing techniques, sensor installations, temperature corrections, and tidal analyses to understand the anomalies and correlations between tilt and gravity measurements.

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Comparison of Tilt and SG-Gravity Residuals at Conrad Observatory (Austria)

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  1. Comparison of Tilt and SG-Gravity Residuals at Conrad Observatory (Austria) Papp, G., Ruotsalainen, H., Meurers, B., Benedek, J., Leonhardt, R. 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  2. CO SBGO Framework: Test measurements for monitoring of tilt deformations along the Mur-Mürz tectonic fault system A 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  3. Conrad-Observatory (SGO) SG 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany) SG STS-2

  4. Conrad-Observatory (SGO) - Instrumentation tiltmeter all sensors are underground installations SG STS-2 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany) -93,728 m

  5. Data processing • LTS N-S tilt • temperature • Installation of • thermal insulation • temp. correction 1arcsec • Filtering (G1s1m FIR filter) and decimation to 1min data 0.1 °C 100 mas 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  6. Data processing • LTS N-S tilt • temperature • Installation of • thermal insulation • temp. correction 1arcsec 0.1 °C 100 mas • Temperature correction (tilt) based on linear and nonlinear models dependent on the thermal event  necessity of thermal insulation 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  7. Data processing 2017 07 04 LTS (E-W) LTS (N-S) • Filtering (G1s1m FIR filter) and decimation to 1min data • Temperature correction (tilt) based on linear and nonlinear models dependent on the thermal event  necessity of thermal insulation • Filtering and decimation to 1h data • Tidal analysis  tidal model 10 mas 10 mas 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  8. Data processing • N-S component: anomalous diurnal g-factors  cavity effect • E-W component: g-factors of iwt closer to WD-model than LTS • N-S component: anomalous diurnal g-factors  cavity effect • E-W component: g-factors of iwt closer to WD-model than LTS • Tidal parameters affected by unknown transfer function of the tilt sensors • N-S component: anomalous diurnal g-factors  cavity effect • E-W component: g-factors of iwt closer to WD-model than LTS • Tidal parameters affected by unknown transfer function of the tilt sensors • LTS scale factor (E-W component) too high (5 – 8 %) •  Sensor dependent tidal models • N-S component: anomalous diurnal g-factors  cavity effect E-W N-S 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  9. Data processing  Sensor dependent admittance 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  10. Data processing • Filtering (G1s1m FIR filter) and decimation to 1min data • Temperature correction (tilt) based on linear and nonlinear models dependent on the thermal event  necessity of thermal insulation • Filtering (G1s1m FIR filter) and decimation to 1h data • Tidal analysis  tidal model • Remove tides, air pressure effect and pole motion effect (gravity only)  residuals • Trend correction (low order polynomial drift, tilt residuals only) 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  11. Comparisonofgravityandtiltresiduals SG 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  12. Comparisonofgravityandtiltresiduals N-S tilt decrease delayed by 2 – 5 hr w.r.t. gravity increase  residual anomalies: caused by different sources, but triggered by the same hydrological process 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  13. Comparisonofgravityandtiltresiduals 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

  14. Conclusions • Tidal model: • cavity effect stronger in N-S than in E-W direction • calibration problem (LTS sensors) • Residuals: • Long-term signatures show a clear correlation between the tilt and SG sensor data • Heavy rain/rapid snow melt events: • Heavy rain events cause sharp SG residual decrease at the beginning • when sufficient amount of water has moved downwards • SG residuals start to increase • N-S tilt residuals start to decrease • Tilt decrease delayed by 2 – 5 hr w.r.t. gravity increase • Complex transport process, karstic phenomena may play an important role as well • Tilt signals stronger in N-S than in E-W direction (cavity effect) • Coupled gravity effects and strain induced tilts due to short- and long-term water transport processes 1st Workshop on the International Geodynamics and Earth Tide Service (IGETS), 18-20 June 2018, Potsdam (Germany)

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