Properties of the Zagreb 22 March 2020 earthquake sequence
نویسندگان
چکیده
Although strong and damaging earthquakes have hit Zagreb in the past, 22 March 2020 earthquake (Mw 5.4) is first one that was recorded by a modern digital local seismic network, which could be analysed not only macroseismic methods, but also microseismic ones. Herewith we used 3003 carefully located events from year of aftershock sequence to learn more about rate decay, their magnitude distribution, focal mechanisms hypocentral locations. The activity found closely follow modified Omori law, fault-plane solutions for 10 indicated prevailing pure-reverse faulting. Our analyses suggest reverse North Medvednica boundary fault (NMBF) causative fault, as it fits with geometry epicentral area triangular shape mainshock vertex, opposite side triangle lying parallel surface trace NMBF. hypocentres aftershocks were predominantly hanging wall fault. No break observed, so rupture assumed buried. These facts interpreted combination effect conservation mass (seismic flow) requiring some fault-parallel stress redistribution transfer material, loading activation compressive environment controlled partition at brittle-ductile transition zone within crust. later process involves compression during interseismic stage when segment brittle crust locked, followed sudden dilatation phase.
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ژورنال
عنوان ژورنال: Geofizika
سال: 2022
ISSN: ['0352-3659', '1846-6346']
DOI: https://doi.org/10.15233/gfz.2021.38.6