The December 2020 Magnitude (Mw) 6.4 Petrinja earthquake, Croatia: Seismological aspects, emergency response and impacts

Author:

Atalić Josip1,Demšić Marija1ORCID,Baniček Maja1,Uroš Mario1,Dasović Iva2,Prevolnik Snježan2,Kadić Alen1,Novak Marta Šavor1,Nastev Miroslav3

Affiliation:

1. University of Zagreb Faculty of Civil Engineering: Sveuciliste u Zagrebu Gradevinski Fakultet

2. University of Zagreb Faculty of Science: Sveuciliste u Zagrebu Prirodoslovno-matematicki fakultet

3. Geological Survey of Canada: Natural Resources Canada Earth Sciences

Abstract

Abstract On December 29, 2020, nine months after the March Mw 5.4 Zagreb earthquake and amidst the COVID-19 lockdown, a devastating Mw 6.4 earthquake struck near the town of Petrinja, about 50 km SE from the country’s capital Zagreb. It was preceded by the Mw 4.9 foreshock from the day before. The main shock claimed 7 fatalities and caused widespread damage. Historical centers of nearby cities with invaluable heritage buildings were significantly affected as were the many residential buildings, built mainly of unreinforced masonry. Damage was observed as far as 60 km from the epicenter. This paper summarizes the seismological aspects of the Mw 6.4 Petrinja earthquake, the emergency response and the main impacts to people and buildings. The description and findings are based on the field observations and a series of post-earthquake activities led by the team of the Faculty of Civil Engineering, University of Zagreb. Typical damage to buildings and usability data are presented with examples based on 50,000 inspection results. By far the most affected were the unreinforced masonry buildings, followed by confined masonry, whereas reinforced concrete buildings were the least affected. The total direct and indirect losses are estimated to 4.8 billion EUR. The provided information represents a useful basis and impetus for improving emergency action and long-term disaster reduction plans in other regions with similar building exposure and seismotectonic settings.

Publisher

Research Square Platform LLC

Reference46 articles.

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3. Atalić J, Šavor Novak M, Uroš M (2018) Updated risk assessment of natural disasters in Republic of Croatia – seismic risk assessment (in Croatian), Faculty of Civil Engineering in collaboration with Ministry. of Construction and Physical Planning and National Protection and Rescue Directorate, Zagreb, Croatia

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5. The Mw5.4 Zagreb (Croatia) earthquake of March 22, 2020: impacts and response;Atalić J;Bull Earthq Eng,2021

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