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The position of the eastern Turkey earthquake epicentre detected by the gravity strain approach and USGS, [27].
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![Figure 2. Elastic thickness determined from GOCE data over Africa [13].](publication/352960427/figure/fig2/AS:1041653917818882@1625361055904/Elastic-thickness-determined-from-GOCE-data-over-Africa-13_Q320.jpg)
The Earth gravity field is a signature of the Earth’s mass heterogeneities and structures and applied in Geodesy and Geophysics for different purposes. One of the main goals of Geodesy is to determine the physical shape of the Earth, geoid, as a reference for heights, but Geophysics aims to understand the Earth’s interior. In this chapter, the gene...
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Context 1
... order to represent an example about the application of this theory, the eastern Turkey Earthquake occurred on 2010-2103-08 at 7:41:41 UTC and depth of 10 km is considered. The position of the earthquake epicentre is 38.709°N and 40.051°E according to the United States Geological Survey (USGS); see Figure 6. In this figure, the map of the maximum shear strain determined from the GRACE monthly gravity models are over the area. ...
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Gravity method is one of the geophysical methods based on a gravity anomaly that arises due to a mass tight variation of the earth’s subsurface material constituents. Research with power spectral analysis of gravity anomaly data has been widely done for sediment thickness estimation. When the Mw 6.2 Majene earthquake occurred on January 15 2021, we...
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In this study, a novel two-scale spherical radial basis function (SRBF) modeling method is proposed for regional gravity field determination. First, satellite-only global gravity field models (GGMs) are combined with airborne gravity data at medium-frequency bands, and a series of combined gravity field models based on band-limited SRBFs are established for the mountainous areas of California and Oregon. The combined gravity field models are then compared with the airborne-only gravity field models. The results show that the combined models exhibit standard deviation (STD) values of 0.106–0.120 m in terms of geoid height differences w.r.t. the global positioning system (GPS)/leveling data, while the corresponding airborne-only models yield STD values of 0.126–0.131 m. The STD values of the combined models are reduced by 0.9–2.0 cm, which implies a potential benefit for the medium-frequency gravity field modeling by combining GGM and airborne gravity data. Second, after removing the low-frequency and medium-frequency gravity field signals as well as the residual terrain model signals from gravity data, a second SRBF modeling process is implemented using multisource residual gravity data. Subsequently, a high-resolution two-scale SRBF gravity field model is constructed for the mountainous areas of California and Oregon. The results indicate that the STD of geoid height differences for the two-scale SRBF model w.r.t. the GPS/leveling data is 0.098 m, with reductions of 3.0–6.2 cm compared to the models based on the single-scale SRBF modeling method. These findings indicate the effectiveness of the two-scale SRBF modeling method for refining the regional gravity field model in complex areas.
