Preliminary Estimation of Kappa Parameter in Croatia (CROSBI ID 650778)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Stanko, Davor ; Markušić, Snježana ; Ivančić, Ines ; Gazdek, Mario ; Gülerce, Zeynep
engleski
Preliminary Estimation of Kappa Parameter in Croatia
Spectral parameter kappa κ is used to describe spectral amplitude decay "crash syndrome" at high frequencies. The purpose of this research is to estimate spectral parameter kappa for the first time in Croatia based on small and moderate earthquakes. Recordings of local earthquakes with magnitudes higher than 3, epicentre distances less than 150 km, and focal depths less than 30 km from seismological stations in Croatia are used. The value of kappa was estimated from the acceleration amplitude spectrum of shear waves from the slope of the high-frequency part where the spectrum starts to decay rapidly to a noise floor. Kappa models as a function of a site and distance were derived from a standard linear regression of kappa- distance dependence. Site kappa was determined from the extrapolation of the regression line to a zero distance. The preliminary results of site kappa across Croatia are promising. In this research, these results are compared with local site condition parameters for each station, e.g. shear wave velocity in the upper 30 m from geophysical measurements and with existing global shear wave velocity – site kappa values. Spatial distribution of individual kappa's is compared with the azimuthal distribution of earthquake epicentres. These results are significant for a couple of reasons: to extend the knowledge of the attenuation of near-surface crust layers of the Dinarides and to provide additional information on the local earthquake parameters for updating seismic hazard maps of studied area. Site kappa can be used in the re- creation, and re-calibration of attenuation of peak horizontal and/or vertical acceleration in the Dinarides area since information on the local site conditions were not included in the previous studies.
Spectral parameter kappa ; attenuation ; Croatia
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Podaci o prilogu
032014
2017.
objavljeno
10.1088/1755-1315/95/3/032014
Podaci o matičnoj publikaciji
IOP Conference Series: Earth and Environmental Science
1755-1307
1755-1315
Podaci o skupu
World Multidisciplinary Earth Sciences Symposium (WMESS 2017)
predavanje
11.09.2017-15.09.2017
Prag, Češka Republika
Povezanost rada
Geologija, Geofizika