Naslov
Changes in b-value before Zagreb earthquake 2020

Autori
Ivanković, Ljiljana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, ostalo

Skup
14. dani kriznog upravljanja

Mjesto i datum
Velika Gorica, Hrvatska, 22.09.2021. - 23.09.2021

Vrsta sudjelovanja
Ostalo

Vrsta recenzije
Podatak o recenziji nije dostupan

Ključne riječi
Gutenberg-Richter relationship, b-value, seismicity, Zagreb earthquake 2020

Sažetak
Gutenberg-Richter relationship connects number of earthquakes N with their minimum magnitude M: logN = a-bM. Physically, parameter b can be interpreted as indicator of stress, where large (small) b- values indicate low (high) stress. A change in b prior to the earthquake that occurred on 22 March 2020 in Zagreb area and during the corresponding sequence is presented. Earthquake parameters from ISC and EMSC are combined to form a catalogue with events in the period 2011-2020 and within 50 km radius from the Zagreb 2020 earthquake epicenter. After determining completeness magnitude Mc=1.5, parameter b is calculated from Gutenberg-Richter relationship using maximum likelihood method. Its temporal change is examined using sliding windows containing 50 events. There is a drop in b-value after the main earthquake, indicating an increase in stress in the researched area.

Izvorni jezik
Engleski

Znanstvena područja
Geofizika

POVEZANOST RADA