INVESTIGATION OF LOCAL SOLID EARTH TIDE IN INDONESIA USING THE INA-CORS GNSS NETWORK
Solid Earth Tide refers to the periodic deformation of the Earth's crust caused by the gravitational forces of the Sun and Moon, significantly impacting various geodetic applications. This study aims to understand the solid earth tide in Indonesia through GNSS data analysis from the Ina-CORS ne...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/86765 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Solid Earth Tide refers to the periodic deformation of the Earth's crust caused by the gravitational forces of the Sun and Moon, significantly impacting various geodetic applications. This study aims to understand the solid earth tide in Indonesia through GNSS data analysis from the Ina-CORS network. The methods employed include Multiday Kinematic PPP and harmonic analysis to develop a more accurate local solid earth tide model compared to the theoretical IERS2003 model. The results indicate that the GNSS-based Ina-CORS solid earth tide model exhibits a high correlation with the IERS2003 theoretical model, with NSE values > 0.9 and low RMSE and MSE. Harmonic analysis identified an increasing amplitude pattern of the M2 component from south to north and a phase pattern of M2 growing from east to west within a range of 80°–180°. Significant residuals were observed near fault zones and tectonic plate boundaries, suggesting local geological influences on this phenomenon. Due to the limited spatial coverage of the Ina-CORS network, kriging interpolation methods with various variogram models were tested for constructing solid earth tide maps. The power variogram was found to produce the smallest deviation, making it the most optimal. The resulting maps revealed vertical deformation moving from east to west, consistent with the phase shift direction, while horizontal deformation displayed a unique figure-eight pattern. This study provides new insights into the dynamics of the solid earth tide in Indonesia and contributes to the development of more representative spatial and temporal models to support future geodetic and mapping applications.
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