Assessment of CROPOS GNSS stations stability after the Petrinja 2020-2021 earthquake series

Šugar, Danijel; Bačíć, Željko; Blagus, Luka

The wider area of the town of Petrinja along with the region of Banija in North-Western Croatia was hit by the earthquake series in December 2020. The series started with the M5.2 earthquake on 28 December 2020 and continued the day after with the mainshock being of M6.4 causing 7 human casualties and huge damage to buildings and infrastructure. That earthquake was felt are reported by humans more than 600 km away from the epicenter. CROPOS as a permanent GNSS network at the time of the earthquake series consisted of 33 stations installed on the Croatian territory among which the SISA station was the closest one to the epicentral area. Static daily observation files from the SISA station along with data from its 6 surrounding stations were processed and results were analyzed to assess their stability and possible permanent displacement. The dataset timeframe consisted of five days before the earthquake series and five days after the mainshock. In that time window (12 days) occurred numerous quakes, 5 of them having M ≥ 4.5. Observation data were processed by static PPP method using two different web services, namely Trimble RTX and CSRS-PPP. The results have shown a maximum permanent displacement of the SISA station: 5.3 cm horizontally, and -2.5 cm vertically

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