HR: 1330h
AN: S52A-0133    [PDF]
TI: Synthetic Strong Ground Motion Validation and Prediction
AU: * Zeng, Y
EM: zeng@seismo.unr.edu
AF: Institute of Earth Sciences, Academia Sinica, 128 Academia Road, Sec. 2, Nankang, Taipei, 115 Taiwan
AU: * Zeng, Y
EM: zeng@seismo.unr.edu
AF: Seismological Lab, University of Nevada, Reno, NV 89557 United States
AB: In this paper, I first validate a ground motion simulation procedure against ground motion observation from the Imperial Valley, Loma Prieta, Landers, Northridge, Kobe, and Kocaeli earthquakes. The ground motion simulation procedure follows Zeng et al. (1994) using a composite source model. In that model, the source is taken as a superposition of circular subevents with a constant stress drop. The number of subevents and their radius follows a power law distribution equivalent to the Gutenberg and Richter's magnitude-frequency relation for seismicity. The heterogeneous nature of the composite source model is characterized by its maximum subevent size and subevent stress drop. As rupture propagates through each subevent, it radiates a circular crack rupture pulse. In addition to wave propagation through a layered earth, the model has been improved by including scattering waves from small scale heterogeneity structure of the earth, site specific ground motion prediction using weak motion site amplification, and nonlinear soil response using geotechnical engineering models. In the current validation study, the fixed and free model parameters have been systematically cataloged and the statistical distribution of those free parameters has been carefully identified. A critical component of the study is to define the function of goodness-of-fit. In this investigation I emphasize on goodness-of-fit based on ground motion response spectra. Other forms of goodness-of-fit based on seismic waveform, shake duration, accumulative energies, etc., are also examined. Based on the result, I then conduct broadband ground motion prediction from scenario earthquakes. The objective of this simulation is to argument the existing empirical strong ground motion database on magnitude, distance, and frequency range. The result will be used to test the function forms used in developing the Next-Generation-Attenuation relation initiated by PEER/SCEC/USGS.
DE: 7212 Earthquake ground motions and engineering
SC: Seismology [S]
MN: 2003 Fall Meeting