A preliminary empirical model for frequency-dependent attenuation of Fourier amplitude spectra In Serbia from the Vrancea earthquakes |
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| Institution: | 1. Department of Food Science, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;2. Department of Animal Sciences, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch, 7602, South Africa;1. Department of Nonlinear Modeling, Institute of Computer Science, Academy of Sciences of the Czech Republic, Pod Vodarenskou vezi 2, 182 07 Prague 8,Czech Republic;2. Czech Institute of Informatics, Robotics, and Cybernetics, Czech Technical University in Prague, Zikova 1903/4, 166 36 Prague 6, Czech Republic;3. Candida Oancea Institute, Polytechnic University of Bucharest, Spl. Independentei 313, 060042 Bucharest, Romania;4. Physics Department, West University of Timisoara, V. Parvan 4, 300223 Timisoara, Romania;5. Department of Climatology, National Meteorological Administration, 97 Sos. Bucuresti-Ploiesti, 013686 Bucharest, Romania;6. Academia Romana, Calea Victoriei 125, Bucharest, Romania |
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| Abstract: | We present the frequency-dependent attenuation model for Fourier amplitude spectra of strong earthquake ground motion in Serbia from intermediate depth earthquakes in the Vrancea source zone in Romania. The development of this type of scaling is the essential first step toward developing the corresponding attenuation and scaling equations for pseudo relative velocity spectra (PSV), which are necessary for seismic macro- and microzoning in the territory of Serbia. Such scaling is necessary because the Vrancea source zone produces large earthquakes with shaking that attenuates differently from the local earthquakes in Serbia. Development of such a scaling model is associated with several difficulties, the principal one being the lack of recorded strong motion accelerograms at epicentral distances exceeding 300 km. To reduce uncertainties with such scaling, we require our preliminary scaling equations to be consistent with independent estimates of seismic moment, stress drop, and radiated wave energy. In the future, when the recorded strong motion data from Vrancea earthquakes increases several-fold of what it is today, it will become possible to perform this analysis again, thus leading to more reliable and permanent scaling estimates. |
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| Keywords: | Frequency dependent attenuation of strong motion from Vrancea earthquakes km Testing of empirical equations via seismic moment Stress drop Seismic wave energy |
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