Modeling and Characterization of Long Period Ground Motion and Associated Spectral Response

HR: 0800h
AN: S31B-0445 [Abstracts]
TI: Modeling and Characterization of Long Period Ground Motion and Associated Spectral Response
AU: * Sesetyan, K
EM: karin@boun.edu.tr
AF: Bogazici University, KOERI, Cengelkoy, Istanbul, 34684, Turkey
AU: Madariaga, R
EM: madariag@geologie.ens.fr
AF: Ecole Normale Superieure, Laboratoire de Geologie, Paris, 75231, France
AU: Durukal, E
EM: durukal@boun.edu.tr
AF: Bogazici University, KOERI, Cengelkoy, Istanbul, 34684, Turkey
AU: Erdik, M
EM: erdik@boun.edu.tr
AF: Bogazici University, KOERI, Cengelkoy, Istanbul, 34684, Turkey
AB: Recent advances in performance-based structural design and base isolation of structures against earthquake caused damage necessitates the accurate prediction of long period ground motions. In the present study three- dimensional finite difference calculations are performed to assess the spatial distribution of long period spectral response resulting from finite ruptures in heterogeneous earth media. Slip distributions of a number of recent earthquakes in the magnitude range of 6.0 to 7.4 are used to simulate the wave propagation with the staggered- grid finite-difference method developed by Madariaga and Olsen (1998) within the frequency range of 0 to 1 Hz. The resulting ground motion time histories, the associated acceleration and displacement response spectra at various distances from the fault as well as the spatial distribution of spectral response amplitudes at large discrete periods (2 to 10 sec) are studied for the characterization of long period ground motion and structural response in terms of fault normal, fault parallel and mean components. The results are also compared with recently developed NGA and other attenuation relationships. The ﬁndings of this study are believed to be particularly useful in the formulation of design elastic displacement spectra for seismic codes, and in zoning studies of seismic hazard for long-period structures.
DE: 7212 Earthquake ground motions and engineering seismology
SC: Seismology [S]
MN: 2007 Fall Meeting