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The Comparison of Gravity Anomalies based on Recent High-Degree Global Models
2018
Journal:  
Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi
Author:  
Abstract:

The Earth system generates different phenomena that are observable at the surface of the Earth such as: Mass deformations and displacements leading to plate tectonics, earthquakes, and volcanism. The dynamic processes associated with the interior, surface, and atmosphere of the Earth affect the three pillars of geodesy: Shape of the Earth, its gravity field, and its rotation. Geodesy establishes a characteristic structure in order to define, monitor, and predict of the whole Earth system. The traditional and new instruments, observable, and techniques in geodesy are related to the gravity field. Therefore, the geodesy monitors the gravity field and its temporal variability in order to transform the geodetic observations made on the physical surface of the Earth into the geometrical surface in which positions are mathematically defined. In this paper, the main components of the gravity field modelling, (Free-air and Bouguer) gravity anomalies are calculated via recent high-degree global models (EIGEN6C4, GECO, and WGM2012) over a selected study area. The model-based gravity anomalies are compared with the corresponding terrestrial gravity data in terms of standard deviation (SD) and root mean square error (RMSE) for determining the best fit global model in the study area at a regional scale in Turkey. The least SD (13.45 mGal) and RMSE (15.42 mGal) were obtained by WGM2012 for the Free-air gravity anomaly residuals. For the Bouguer gravity anomaly residuals, EIGEN6C4 provides the least SD (8.05 mGal) and RMSE (8.12 mGal). The results indicated that EIGEN6C4 can be a useful tool for modelling the gravity field of the Earth over the study area.

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Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi

Field :   Fen Bilimleri ve Matematik; Mühendislik

Journal Type :   Ulusal

Metrics
Article : 1.428
Cite : 2.854
2023 Impact : 0.161
Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi