A new European service to share GNSS Data and Products

Fernandes, Rui; Bruyninx, C.; Crocker, Paul; Menut, Jean-Luc; Socquet, Anne; Vergnolle, Mathilde; Avallone, Antonio; Bos, M. S.; Bruni, Sergio Fabian Sanchez; Cardoso, Rui Costa; Carvalho, Luís Miguel; Cotte, Nathalie; D’Agostino, N.; Déprez, Aline; Andras, Fabian; Geraldes, Fernando; Janex, Gaël; Kenyeres, A.; Legrand, J.; Ngo, Khai-Minh; Lidberg, Martin; Liwosz, Tomasz; Manteigueiro, José; Miglio, Anna; Soehne, Wolfgang; Holger, Steffen; Tóth, Sándor; Douša, Jan; Ganas, Athanassios; Kapetanidis, Vasilis; Batti, Gabriela

doi:10.4401/ag-8776

Cited by 4 publications

(1 citation statement)

References 25 publications

(28 reference statements)

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“…All solutions yield consistent results in identifying higher strain rate regions and provide estimates of the main axes of deformation with coherent and comparable directions. The observed principal directions of strain rate for the VISR method are also comparable with the principal directions of the strain rate products of EPOS [Fernandes et al, 2022]. The Nearest Neighbor method clearly provides the less smooth solution, with short wavelength changes in the modeled velocities, which map in rapid changes in the dilatational rates that do not necessarily reflect the scattered observed velocities.…”

Section: Riccardo Nucci Et Almentioning

confidence: 58%

Comparative Analysis of Methods to Estimate Geodetic Strain Rates from GNSS Data in Italy

Nucci,

Serpelloni,

Faenza

et al. 2024

Annals of Geophysics

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Our ability to estimate surface deformation rates in the Central Mediterranean has considerably enhanced in the last decade thanks to the growth of continuous Global Navigation Satellite System (GNSS) networks. Focusing on the Apennine/Alpine seismogenic belt, this area offers the opportunity to test the use of geodetic strain rates for constraining active tectonic processes and for seismic hazard assessments. Given the importance of geodetic strain rate models in modern hazard estimation approaches, however, one has to consider that different approaches can provide significantly different strain rate maps. Despite the increasing availability of GNSS velocity data, in fact, strain rate models can significantly differ, because of the spatial heterogeneity of GNSS stations locations and inherent strategies in computing strain rates. Using a dense GNSS velocity dataset, this study examines three methods for estimating horizontal strain rates, described in the recent literature and selected to represent approaches of increasing mathematical complexity. Advantages, drawbacks and optimal settings of each method are discussed. The main result is an ensemble of strain rate models that enable the evaluation of epistemic uncertainties in seismicity rates models constrained by geodetic velocities.

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Section: Riccardo Nucci Et Almentioning

confidence: 58%

Comparative Analysis of Methods to Estimate Geodetic Strain Rates from GNSS Data in Italy

Nucci,

Serpelloni,

Faenza

et al. 2024

Annals of Geophysics

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EPOS-GNSS Data Quality Monitoring Web Portal

Bamahry,

Legrand,

Bruyninx

et al. 2024

International Association of Geodesy Symposia

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The European Plate Observing System (EPOS) is a large and complex European e-infrastructure that facilitates the integrated use of multi-disciplinary datasets and services for Solid Earth research. EPOS’ GNSS (Global Navigation Satellite Systems) component provides access to GNSS data and products. This paper introduces a new EPOS web portal (https://gnssquality-epos.oma.be) that has been developed with the aim to provide the necessary information to monitor the availability and quality of daily GNSS data that are discoverable through EPOS. Currently, the web portal includes the tracking performances of more than 1600 GNSS stations. Several GNSS data quality indicators (DQIs), such as the number of observed versus expected observations, the number of missing epochs, the number of observed satellites, the maximum number of observations, the number of cycle slips, the Standard Point Positioning results, and the multipath values on code observation are monitored and their plots are available online. These DQIs provide helpful information that can be used to detect a potential degradation of the quality of the GNSS observations. Here, we will present the status of the web portal, the considered data quality indicators, and their benefits for GNSS data users.

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The seismogenic structure of March 2021 Tyrnavos (central Greece) doublet (Mw 6.3 andMw 6.0), constrained by aftershock locations and geodetic data

Papadimitriou,

Karakostas,

Papazachos

et al. 2023

Geophysical Journal International

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Summary The Northern Thessaly Basin in central Greece ranks amongst the most well pronounced extensional (graben) basins in the back-arc Aegean Sea region, with well–mapped faults having an ∼E–W orientation, compatible with the ongoing predominant ∼N–S extension. The southern margin of the basin is bounded by major faults associated with strong (M6 to M7) earthquakes, whereas along its northern margin, strong events are more scarce, in the documented catalogues. Along this northern margin, a weak, albeit persisting foreshock activity, culminated within three days, to an Mw6.3 earthquake on 3 March 2021 associated with a 15 km–long NE dipping fault segment. It was followed the next day, by the second Mw6.0 main shock associated with a 13 km–long NE dipping fault segment and nine days later by an Mw5.5 earthquake associated with an 8 km–long SW dipping fault segment, with its aligned epicenters, showcasing the cascade type activation of adjacent fault segments. The sequence, evolved to be very productive, with aftershocks extending ∼50 km along a ∼NW–SE trending narrow seismic zone. All events indicate pure normal faulting, with an NNE–SSW oriented extensional axis, oblique to our previous consensus of the prevalence of ∼N–S extension. This observation documents that inherited fault fabric can be reactivated within the modern tectonic stress field. We use high–quality seismological data, alongside InSAR (Interferometric Synthetic Aperture Radar) methodology and GNSS (Global Navigation Satellite System) data, to study the temporal and spatial evolution of the sequence, and to provide inferred kinematic models that describe the complexity of the seismic process, in terms of heterogeneous slip distribution, activated fault planes, fault geometry, and displacement field. Cross–sections show that the activity defines the crustal seismogenic layer at depths between 5 and 10 km, associated with low–angle fault segments dipping to the NE. Other faults, both antithetic and secondary ones, appear active and accommodated aftershocks clusters. Using our preferred finite fault source model, we calculated the changes of Coulomb failure stress on the neighboring faults.

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A new European service to share GNSS Data and Products

Cited by 4 publications

References 25 publications

Comparative Analysis of Methods to Estimate Geodetic Strain Rates from GNSS Data in Italy

Comparative Analysis of Methods to Estimate Geodetic Strain Rates from GNSS Data in Italy

EPOS-GNSS Data Quality Monitoring Web Portal

The seismogenic structure of March 2021 Tyrnavos (central Greece) doublet (Mw 6.3 andMw 6.0), constrained by aftershock locations and geodetic data

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