Erroneous GNSS Strain Rate Patterns and their Application to Investigate the Tectonic Credibility of GNSS Velocities

Araszkiewicz, Andrzej; Figurski, Mariusz; Jarosiński, Marek

doi:10.1515/acgeo-2016-0057

Cited by 21 publications

(10 citation statements)

References 25 publications

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“…Arti cial e ects can in uence the data, but these clear oscillations are revealed only in the LEGN-GLOG baseline and mostly in the N component of the stations' positions. What is more, they obtained results of apparent strain performance corresponding to those presented in the work by Araszkiewicz et al (2016). This fundamental work in subject of stress eld in Poland presents apparent strain vectors evaluated for the studied area show similar rates and orientations, which follow from the study presented here.…”

Section: The Datasupporting

confidence: 80%

“…Since 1 st June 2008, when the ASG-EUPOS (Active Geodetic Network), a country system for precise satellite positioning in Poland started to operate with full operability (Bosy et al, 2007), many studies have been conducted to explore tectonic movements. So, the studies in geodynamics utilizing the system has been applied and a great number of papers were devoted to regional and also to local aspects of geodynamics (Bo-gusz et al, 2012;Kontny and Bogusz, 2012;Bogusz et al, 2014;Klos et al, 2015;Araszkiewicz et al, 2016). In a common approach, the velocities of the network's stations derived on daily outcomes (so-called daily solutions) were analysed.…”

Section: The Datamentioning

confidence: 99%

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High-energy seismic events in Legnica–Głogów Copper District in light of ASG-EUPOS data

Szczerbowski

2019

Reports on Geodesy and Geoinformatics

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Seismic events in the area of Poland are related mostly to copper and coal mining, and they are regarded as the most dangerous natural hazard. Although development of geomechanical modelling as the development of geophysical methods determining seismic hazard are evident, low predictability of the time-effect relationship still remains. Geomechanical models as geophysical data analysis highlight the interaction between parts of rock mass or allow to reconstruct the way of rock mass destruction and to understand the processes that take place in the high-energy tremors.However, the association of larger mining tremors with pre-existing geological features has been reported by many investigators; in geomechanical practice, investigations of rock mass condition concentrate on this problem in the local scale. Therefore, the problem of relations between high-energy seismic events in Legnica–Głogów Copper District (LGCD) and regional scale deformations of terrain surface resulting from possible tectonic activity is discussed in this paper. The GNSS data evaluated from the observations of ASG-EUPOS (Active Geodetic Network – EUPOS) stations in the area of LGCD and in the adjacent areas is analysed in this study. Temporal variation of distances between the stations and evaluated on that base so called apparent strain was combined with the occurrence of high-energy tremors. Consequently, after the examination and analysis of occurrences of mining tremors, it is found that high-energy seismic events and periods of strain accumulation evaluated from GPS/GNSS data have temporal relations. Although the seismic events were triggered by mining, nearly all the events with energy E > 108 J occurred in the periods when the analysed stations’ positions demonstrated a decrease in the baseline length.

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Section: The Datasupporting

confidence: 80%

Section: The Datamentioning

confidence: 99%

High-energy seismic events in Legnica–Głogów Copper District in light of ASG-EUPOS data

Szczerbowski

2019

Reports on Geodesy and Geoinformatics

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“…Any jump in deformation components caused by artifacts in the segmentation method can be smoothed out in the gridding. This method is more precise and robust than other methods and is particularly useful in tectonically stable areas with relatively low‐magnitude velocity vectors, such as the Korean Peninsula (Araszkiewicz et al, ; Bogusz et al, ; Wu et al, ).…”

Section: Methodsmentioning

confidence: 99%

Crustal Deformation of South Korea After the Tohoku‐Oki Earthquake: Deformation Heterogeneity and Seismic Activity

et al. 2018

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Although the 2011 Tohoku-Oki earthquake (Mw 9.0, 11 March 2011) occurred more than 1,000 km from South Korea, it significantly changed the magnitudes and orientations of Global Positioning System (GPS) velocity vectors in the country, which took two years to return to preearthquake values. Then, areas with relatively thick crust show contractional surface deformation, whereas areas with thinner crust show dilatation, suggesting that the deformation pattern is long-term. Although there is no one-to-one correlation between earthquakes and surface deformation, earthquakes tend to be concentrated in areas with higher shear strain rates. In South Korea, the stress field inferred from earthquake data is inconsistent with surface deformation calculated from GPS data. This may arise because stress orientations at earthquake focal depths are different from those at the surface, or surface deformation measured by GPS may represent interseismic elastic deformation leading to future large earthquakes, while recent earthquakes without surface ruptures might not contribute to the surface deformation. Some effects of crustal thickness on surface deformation and inconsistency between surface deformation from GPS data and kinematics from earthquake data may be a common feature of intraplate regions. Plain Language Summary This paper deals with surface deformation of South Korea after the 2011Tohoku-Oki earthquake (earthquake magnitude = 9.0), using Global Positioning System (GPS) data. By analyzing the relationship between deformation of crust and earthquake activity, we conclude that earthquakes in South Korea occur most commonly in areas with higher strain rates. We also show that the effects of the 2011 Tohoku-Oki earthquake on the Korean Peninsula lasted for two years after the earthquake.

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“…Furthermore, anomalous movement of stations may generate errors in rates field of the surrounding area. Therefore it is important to adopt a correct strategy of computation [42] in order to optimize the interpolation of the strain rates using discrete geodetic measurements.…”

Section: Strain Map Rate From Gnss Observationsmentioning

confidence: 99%

Victoria Land, Antarctica: An Improved Geodynamic Interpretation Based on the Strain Rate Field of the Current Crustal Motion and Moho Depth Model

et al. 2020

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In Antarctica, the severe climatic conditions and the thick ice sheet that covers the largest and most internal part of the continent make it particularly difficult to systematically carry out geophysical and geodetic observations on a continental scale. It prevents the comprehensive understanding of both the onshore and offshore geology as well as the relationship between the inner part of East Antarctica (EA) and the coastal sector of Victoria Land (VL). With the aim to reduce this gap, in this paper multiple geophysical dataset collected since the 1980s in Antarctica by Programma Nazionale di Ricerche in Antartide (PNRA) were integrated with geodetic observations. In particular, the analyzed data includes: (i) Geodetic time series from Trans Antarctic Mountains DEFormation (TAMDEF), and Victoria Land Network for DEFormation control (VLNDEF) GNSS stations installed in Victoria Land; (ii) the integration of on-shore (ground points data and airborne) gravity measurements in Victoria Land and marine gravity surveys performed in the Ross Sea and the narrow strip of Southern Ocean facing the coasts of northern Victoria Land. Gravity data modelling has improved the knowledge of the Moho depth of VL and surrounding the offshore areas. By the integration of geodetic and gravitational (or gravity) potential results it was possible to better constrain/identify four geodynamic blocks characterized by homogeneous geophysical signature: the Southern Ocean to the N, the Ross Sea to the E, the Wilkes Basin to the W, and VL in between. The last block is characterized by a small but significant clockwise rotation relative to East Antarctica. The presence of a N-S to NNW-SSE 1-km step in the Moho in correspondence of the Rennick Geodynamic Belt confirms the existence of this crustal scale discontinuity, possibly representing the tectonic boundary between East Antarctica and the northern part of VL block, as previously proposed by some geological studies.

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Erroneous GNSS Strain Rate Patterns and their Application to Investigate the Tectonic Credibility of GNSS Velocities

Cited by 21 publications

References 25 publications

High-energy seismic events in Legnica–Głogów Copper District in light of ASG-EUPOS data

High-energy seismic events in Legnica–Głogów Copper District in light of ASG-EUPOS data

Crustal Deformation of South Korea After the Tohoku‐Oki Earthquake: Deformation Heterogeneity and Seismic Activity

Victoria Land, Antarctica: An Improved Geodynamic Interpretation Based on the Strain Rate Field of the Current Crustal Motion and Moho Depth Model

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