Satellite gravity – enhancements from new satellites and new altimeter technology

Green, Christopher M.; Fletcher, K.M.U.; Cheyney, S.; Dawson, Geoffrey; Campbell, Simon

doi:10.1111/1365-2478.12697

Cited by 14 publications

(5 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The regional gravity data for the southern Baltic Sea come from the Getech's Multi‐Sat satellite altimetry‐derived gravity product (Getech Group plc., 2024; Green et al., 2019). The original data were gridded at a 0.02° resolution corresponding to c. 2.2 km in the y dimension and c. 1.3 km in the x dimension.…”

Section: Methodsmentioning

confidence: 99%

Crustal‐Scale Pop‐Up Structure at the Junction of Two Continental‐Scale Deformation Zones in the Southern Baltic Sea

Ponikowska,

Stovba,

Mazur

et al. 2024

Tectonics

View full text Add to dashboard Cite

The southern Baltic Sea is a peculiar area, where the Sorgenfrei‐Tornquist Zone (STZ), stretching from Bornholm into the North Sea, connects to the Teisseyre‐Tornquist Zone (TTZ) that continues SE up to the Black Sea. In this study, we show the structure and evolution of this controversially debated area, both on crustal and basin scale, by using three seismic reflection profiles combined with 2‐D potential field data. The results demonstrate that the southern Baltic Sea is underlain by a thick crust of the East European Craton with a Moho depth in the range of 38–42 km. The overall crustal architecture is shaped by three phases of localized stretching in the early Paleozoic, Devonian‐Carboniferous, and Permian‐Mesozoic. The most spectacular feature of the southern Baltic Sea is a zone of thick‐skinned compressional deformation produced by Late Cretaceous‐early Paleogene inversion, including a system of thrusts and back thrusts penetrating the entire crust in an 80–90 km wide inversion zone. ENE‐vergent thrusts are traced from the top of the Cretaceous down to the Moho and they are accompanied by back thrusts of opposite vergence, also reaching the Moho. Inversion tectonics resulted in the uplift of a block of cratonic crust as a pop‐up structure, bounded by thrusts and back thrusts, and the displacement of the Moho within the STZ and TTZ. The similar mechanism of intra‐cratonic inversion was recognized for the Donbas Foldbelt in eastern Ukraine, and it may be characteristic of rigid cratons, where deformation is localized in a few preexisting zones of weakness.

show abstract

Section: Methodsmentioning

confidence: 99%

Crustal‐Scale Pop‐Up Structure at the Junction of Two Continental‐Scale Deformation Zones in the Southern Baltic Sea

Ponikowska,

Stovba,

Mazur

et al. 2024

Tectonics

View full text Add to dashboard Cite

show abstract

“…The new generation of satellite altimeter missions, especially those with Synthetic Aperture Radar-SAR and SAR Interferometric-SARIn modes, e.g. CryoSat-2 and Sentinel-3 (Abulaitijiang et al 2015;Bonnefond et al 2018), or with Ka-band of the SARAL/AltiKa mission (Verron et al 2021), allows reliable gravity data to be acquired closer to coast (Green et al 2019). Consequently, the recent altimetric gravity field models may be significantly improved in the coastal areas.…”

Section: Introductionmentioning

confidence: 99%

Potential of cold-atom airborne gravimetry to improve coastal gravity field and quasigeoid modelling

Vu,

Bonvalot,

Seoane

et al. 2024

J Geod

View full text Add to dashboard Cite

We investigate using the GIRAFE cold-atom gravimeter during an airborne gravity survey for improving gravity field and quasigeoid modelling. The study is conducted over the Bay of Biscay, France. Geoid/quasigeoid determination is usually a major challenge over such coastal areas due to scarce and inconsistent gravity data. In a first step, the GIRAFE dataset is analysed and compared with available surface gravity data as well as with global altimetry models from UCSD and DTU. The comparisons indicate that the DTU model is better than the UCSD model within around 10 km from the coastline. Furthermore, recent satellite altimeter missions significantly improve the altimetry models in coastal areas. A significant bias (− 4.00 mGal) in shipborne data is also found from this comparison. In a second step, eight quasigeoid solutions are calculated to evaluate the contribution of GIRAFE data. This contribution reaches 3 cm in terms of height anomaly for DTU21 while being much larger for UCSDv31 and shipborne data. Finally, the quasigeoid solutions are validated using GNSS-levelling data. The results indicate that using GIRAFE data improves by approximately 50% the quality of quasigeoid models over land near the coast. The highest accuracy, around 1 cm, is achieved when GIRAFE data are merged with refined gravity data. Importantly, the standard deviation is just 1.2 cm when compared with GNSS-levelling points if using only GIRAFE data over marine areas, which is very close to the 1 cm goal of geoid/quasigeoid model determination in modern geodesy. This study thus confirms the benefits of performing airborne gravity survey using quantum sensors.

show abstract

“…The resolution of these methods has continuously improved in recent years, thanks in part to newly available and more accurate radar data. Moreover, radar altimetry has the advantage of near‐global coverage and almost homogeneous error characteristics in non‐coastal regions (Fu & Cazenave, 2000; Green et al., 2019). When comparative data acquired independently and with different techniques are available, such as marine geophysical measurements, it is possible to provide a more exhaustive and quantitative assessment of the satellite altimetry errors.…”

Section: Introductionmentioning

confidence: 99%

A Comparison Between Sea‐Bottom Gravity and Satellite Altimeter‐Derived Gravity in Coastal Environments: A Case Study of the Gulf of Manfredonia (SW Adriatic Sea)

Zampa

Lodolo

Creati

et al. 2022

Earth and Space Science

View full text Add to dashboard Cite

The marine gravity field derived from satellite altimetry is generally biased in coastal areas by signals back‐scattered from the adjacent land. As a result, the derived gravity anomalies are generally unreliable for geophysical and geological interpretations of near‐shore environments. We compared two different altimetry models with sea‐bottom gravity measurements acquired along the Italian coast to quantify the errors generated by reflections from onshore areas and verify the quality of the geologic models inferred from gravity data. We focused on the Gulf of Manfredonia, in the SE sector of the Adriatic Sea, where (a) two different sea‐bottom gravity surveys have been conducted over the years, (b) the bathymetry is mainly flat, and (c) seismic data has revealed a prominent carbonate ridge covered by hundreds of meters of Oligocene‐Quaternary sediments. Gravity field derivatives have been used to enhance both deep geological contacts and coastal noise. The analyses point to a ringing noise that degrades the altimeter signals up to 17 km from the coast. Differences between observations and gravity calculated from a geological model and constrained by seismic data show that all the data sets investigated register approximately the same interference patterns associated with the Gondola Fault Zone. This study shows the potential for integrating gravity anomalies from satellite altimetry with high‐resolution near‐shore data, such as that provided by sea‐bottom gravity network available around the Italian coasts. Future applications will use this technique to improve the analysis of the connections between marine and inland geology in transitional areas.

show abstract

Satellite gravity – enhancements from new satellites and new altimeter technology

Cited by 14 publications

References 22 publications

Crustal‐Scale Pop‐Up Structure at the Junction of Two Continental‐Scale Deformation Zones in the Southern Baltic Sea

Crustal‐Scale Pop‐Up Structure at the Junction of Two Continental‐Scale Deformation Zones in the Southern Baltic Sea

Potential of cold-atom airborne gravimetry to improve coastal gravity field and quasigeoid modelling

A Comparison Between Sea‐Bottom Gravity and Satellite Altimeter‐Derived Gravity in Coastal Environments: A Case Study of the Gulf of Manfredonia (SW Adriatic Sea)

Contact Info

Product

Resources

About