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Article

Coseismic Ground Displacement after the Mw6.2 Earthquake in NW Croatia Determined from Sentinel-1 and GNSS CORS Data

1
IGEA d.o.o., Frana Supila 7/b, 42000 Varaždin, Croatia
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Department of Civil Engineering, University North, 42000 Varaždin, Croatia
3
ETH Zürich, Institute of Geodesy and Photogrammetry, CH-8093 Zurich, Switzerland
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Department of Geomatics, Faculty of Geodesy at University of Zagreb, Chair of State Survey, 10000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Academic Editors: Dimitrios Nikolopoulos and Jesus Martinez-Frias
Geosciences 2021, 11(4), 170; https://doi.org/10.3390/geosciences11040170
Received: 15 February 2021 / Revised: 30 March 2021 / Accepted: 31 March 2021 / Published: 8 April 2021
(This article belongs to the Section Geophysics)
At the very end of the year 2020, on 29 December, a hazardous earthquake of Mw = 6.2 hit the area of Petrinja and its surroundings, in the NW of Croatia. The earthquake was felt across the area of 400 km, leaving an inconceivable damage in the vicinity of the epicenter, devastated towns and ruined lives. In order to map the spreading of earthquake waves and to determine the coseismic ground displacement after the mainshock, we have analyzed open satellite radar images of Sentinel-1 and the GNSS data from the nearest CORS station related to the epicenter, along with the seismic faults. In this paper, we addressed and mapped the displacement linear surface ruptures detected by the SAR interferometry. The results show the vertical ground displacement to the extent of −12 cm in the southern area and up to 22 cm in the north-western part of a wide area struck by the earthquake impact, related to the epicenter. Subsidence and uplift in a range of ±5 cm over a wider affected area indicate a spatial extent and hazardous impact made by the earthquake. The ground displacement of 30 cm to the West and 40 cm to the East has been identified considering the intersection of Pokupsko and Petrinja strike-slip fault system in the seismic zone of Pannonian basin. Accordingly, we obtained matching results of 5 cm south-easting shift and −3 cm subsidence on Sisak GNSS CROPOS station, addressing the tectonic blocks movement along the activated complex fault system. The results compared with the geology data confirm the existence of two main faults; the Pokupsko and the Petrinja strike-slip faults and interpret the occurrence of secondary post-seismic events over the observed area. View Full-Text
Keywords: 29 December 2020 hazardous earthquake; Mw6.2 earthquake in Croatia; Sentinel-1; SAR processing; coseismic ground displacement; GNSS 29 December 2020 hazardous earthquake; Mw6.2 earthquake in Croatia; Sentinel-1; SAR processing; coseismic ground displacement; GNSS
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MDPI and ACS Style

Bjelotomić Oršulić, O.; Markovinović, D.; Varga, M.; Bašić, T. Coseismic Ground Displacement after the Mw6.2 Earthquake in NW Croatia Determined from Sentinel-1 and GNSS CORS Data. Geosciences 2021, 11, 170. https://doi.org/10.3390/geosciences11040170

AMA Style

Bjelotomić Oršulić O, Markovinović D, Varga M, Bašić T. Coseismic Ground Displacement after the Mw6.2 Earthquake in NW Croatia Determined from Sentinel-1 and GNSS CORS Data. Geosciences. 2021; 11(4):170. https://doi.org/10.3390/geosciences11040170

Chicago/Turabian Style

Bjelotomić Oršulić, Olga, Danko Markovinović, Matej Varga, and Tomislav Bašić. 2021. "Coseismic Ground Displacement after the Mw6.2 Earthquake in NW Croatia Determined from Sentinel-1 and GNSS CORS Data" Geosciences 11, no. 4: 170. https://doi.org/10.3390/geosciences11040170

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