The first absolute gravity and height reference network in Sicily

Area of Science:

• Geodesy and Geophysics
• Earth Sciences

Background:

• Establishing precise geodetic reference networks is crucial for scientific and technological applications.
• Sicily's unique geological setting necessitates a modern height system for accurate monitoring.

Purpose of the Study:

• To develop the methodological and instrumental framework for a new absolute gravity and height reference network in Sicily.
• To contribute to updated reference systems in the Italian region, supporting gravity field studies and height system definition.

Main Methods:

• Establishment of a 5-station absolute gravity and height reference network across Sicily.
• Re-occupation of four stations measured in the 1990s to assess long-term changes.
• Analysis of gravity data and co-located GPS/GNSS data to evaluate site stability and ground deformation.

Main Results:

• The new network provides a robust framework for absolute gravity and height referencing in Sicily.
• Long-term gravity measurements over approximately 30 years indicate stability at the selected absolute gravity stations.
• Analysis of GPS/GNSS data supports the assessment of long-term ground deformation patterns.

Conclusions:

• The established network is suitable for defining modern height systems and supporting gravity field research in Sicily.
• The confirmed long-term stability of the sites validates their use as fundamental reference points.
• This work lays the foundation for future geodetic monitoring and research in the region.