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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:30 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Spectral analysis of high-frequency acceleration data of Vrancea earthquakes to characterize source properties
Authors:
M. Radulian, E. Popescu, A.O. Placinta, M. Popa, I.A. Moldovan, B. Grecu
Affiliation:
National Institute for Earth Physics, P.O. Box MG-2, 077125, Bucharest, ROMANIA
E-mail
Keywords:
seismicity regime,tomography experiment
Abstract:
Vrancea seismic region is an intriguing geodynamic region of the world with a particular and uncommon behavior of the seismicity regime. Of primary importance to characterize the earthquake process is the study of seismic source parameters from local high-frequency data. To this aim, a set of 150 small-to-large Vrancea earthquakes (1012< M0 <1021 Nm) with high-quality waveform data is considered. It includes multiple recordings recently obtained through the progress of seismic networks on the Romanian territory within the cooperation programme with the University of Karlsruhe (Germany): Collaborative Research Centre 461 programme (Bonjer et al., 2000) and temporary experiments, such as tomography experiment CALIXTO’99 (Wenzel et al., 1999) and urban seismology experiment URS (Ritter et al., 2005). The analysis is based on relative deconvolution methods, such as spectral ratios and empirical Green’s function deconvolution, which are applied for pairs of collocated events with similar focal mechanism. The source parameters are investigated in connection with source scaling and clustering properties and their implications on the geodynamics and seismotectonics of the South-Eastern Carpathian region is discussed.
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