Wyniki wyszukiwania - Biblioteka Nauki

1

Slip deformation along the Gyaring Co fault from InSAR and GPS

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Zhang Q. , Li Y. , Zhang J. , Tian Y. , Tian T. , Li B.

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tom Vol. 71, no. 1

53--63

EN

Interferometric synthetic aperture radar (InSAR) can monitor large-scale small deformation. Because the Sentinel-1 satellite has a stable orbit control and the data coherence in Qinghai–Tibet Plateau is good, we utilize data from Sentinel-1 to analyze the slip deformation of the Gyaring Co fault (GCF) in the central Tibetan Plateau. Data are obtained from ascending and descending tracks covering the research area, and the deformation results are obtained by the stacking and analysis of time series. The results demonstrate that the GCF exhibit slow slip overall. An analysis of different sections indicates that the fault displays both right-lateral strike-slip and normal faulting behaviors, and the movement is particularly obvious in the middle section of the GCF. Furthermore, we investigate the contemporary slip rate of the GCF using GPS data and construct two velocity profiles perpendicular to the fault strike at the southeastern and northwestern ends of the fault. The southeastern profile shows ~4 mm/year of right-lateral strike-slip movement and a modest (<1 mm/year) amount of crustal thickening across the fault, while the northwestern profle shows much slower (~ 1 mm/year) right-lateral strike-slip motion and 0.5 mm/ year of crustal extension. The GPS results are consistent with the InSAR deformation map derived using Sentinel-1 A/B data from 2014 to 2017. Our results support the distributed crustal motion model in which most crustal deformation (shortening/ extension/strike-slip) occurs on various active faults in the central Tibetan Plateau rather than being concentrated on several fast-moving fault zones, e.g., the GCF-BCF. Finally, we analyze the distribution of historical earthquakes and the gravity and aeromagnetic felds. We speculate that a fault may exist north of Gyaring Co Lake that may be an extension of the fault north of Mujiu Co Lake.

2

Możliwości wykorzystania satelitarnej interferometrii radarowej InSAR w monitorowaniu zagrożeń górniczych

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Popiołek E. , Marcak H. , Krawczyk A.

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tom nr 6

16-18

PL

W pracy przedstawiono możliwości wykorzystania satelitarnego radarowego skanowania terenu metodą InSAR do ciągłego monitorowania zmian terenu wywołanych podziemną eksploatacją górniczą złóż. Wykazano, że możliwe jest m. in. Wyznaczanie okresowych obniżeń terenu, rejonów aktualnego zagrożenia budowli, a także weryfikowanie prognoz deformacji powierzchni terenu. Podkreślono możliwość monitoringu obniżeń powierzchni terenu bez konieczności zakładania sieci geodezyjnej. Wykazano istnienie korelacji pomiędzy położeniem epicentrum wstrząsów górniczych, a zmianami w strukturze obniżeń terenu.

EN

This paper presents the possibilities to monitor subsidence trough caused by underground exploitation of the seam deposit with the application of a satellite method InSAR. This method allow us to making determination of periodical increases in the area of subsidence and making comparisons between measured values and evaluated before exploitation. It was proved that the InSAR method allows the assessment of current threat to the mining area and objects by defining the areas of intensive subsidence as well as the estimation of maximal values of deformation indexes. Emphases possibilities using InSAR method instead of traditional survey measurements. The correlation between tremor localization and changes in the deformation structure was shown.

3

Rozważania nad dokładnością zobrazowań radarowych satelity Sentinel-1A wykorzystanych na terenach górniczych

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Witkowski W. T. , Malinowska A. , Hejmanowski R.

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tom T. 73, nr 1

78--83

PL

Dwuletni okres najnowszej misji satelitarnej Europejskiej Agencji Kosmicznej pozwala na dokonanie pierwszych, głębszych analiz możliwości zastosowania zobrazowań radarowych dla celów wyznaczania przemieszczeń pionowych na terenach przekształconych. Satelita Sentinel-1A daje możliwości prowadzenia takich analiz w cyklu 12-dniowym. W artykule dokonano obszernego wprowadzenia w technologiczne aspekty przetwarzania satelitarnych zobrazowań radarowych. Następnie dokonano analizy okresowych zmian wysokościowych powierzchni terenu w latach 2015-2016 na terenie górniczym jednej z polskich kopalń głębinowych na bazie technologii DInSAR. Wykazano przydatność omawianej metodyki, jej względną wysoką dokładność w porównaniu z klasyczną niwelacją techniczną. Omówiono również ograniczenia prezentowanej metodyki, podając kierunki przyszłych badań w tym zakresie.

EN

The two-year period of the latest satellite mission of the European Space Agency provided images that support the analysis of ground vertical displacement in mining areas. Satellite Sentinel-1A gives the possibility to carry out such an investigation in the cycle of 12 days. In this paper a comprehensive introduction to the technological aspects of the processing of satellite images has been presented. The essential research was focused on the analysis of periodic vertical movements of the terrain surface located above underground mining operation from 2015 to 2016. The SAR images processing was performed based on DInSAR method. The research confirmed relative high accuracy of vertical points movement observed based on SAR images in comparison with the classical leveling. Not only high effectiveness of the presented method has been proved, but also limitation of that solution has been discussed. The authors summarize their achievement by giving directions for future research in this area.

4

Accuracy assessment of TanDEM-X IDEM using airborne LiDAR on the area of Poland

85%

Woroszkiewicz M. , Ewiak I. , Lulkowska P.

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nr 1

5

Accuracy assessment of TanDEM-X IDEM using airborne LiDAR on the area of Poland

71%

Woroszkiewicz M. , Ewiak I. , Lulkowska P.

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tom Vol. 66, no. 1

137--148

EN

The TerraSAR-X add-on for Digital Elevation Measurement (TanDEM-X) mission launched in 2010 is another programme – after the Shuttle Radar Topography Mission (SRTM) in 2000 – that uses space-borne radar interferometry to build a global digital surface model. This article presents the accuracy assessment of the TanDEM-X intermediate Digital Elevation Model (IDEM) provided by the German Aerospace Center (DLR) under the project “Accuracy assessment of a Digital Elevation Model based on TanDEM-X data” for the southwestern territory of Poland. The study area included: open terrain, urban terrain and forested terrain. Based on a set of 17,498 reference points acquired by airborne laser scanning, the mean errors of average heights and standard deviations were calculated for areas with a terrain slope below 2 degrees, between 2 and 6 degrees and above 6 degrees. The absolute accuracy of the IDEM data for the analysed area, expressed as a root mean square error (Total RMSE), was 0.77 m.