Broadband Kinematic Stochastic Simulation of an Earthquake Source: a Refined Procedure for Application in Seismic Hazard Studies

摘要: To carry out a realistic simulation of earthquake strong ground motion for applied studies, one needs an fault/source simulator that can integrate most relevant features observed ruptures. A procedure this kind is proposed creates broadband kinematic source model. At lower frequencies, the described as propagating slip pulse with locally variable velocity. The final assumed to be two-dimensional (2D) random function. higher radiation from same running strip and incoherent in space. model discretized space grid point subsources certain time histories. shape spectrum generated implicitly by simulated kinematics propagation. original approach used generate signals spectra plausibly approximate prescribed smooth far-field spectrum. This set on basis assumedly known regional empirical spectral scaling law, subsource moment rate histories are conditioned so fit expected For function describes over fault area, lognormal probability distribution amplitudes assumed, exploratory analysis inverted distributions. Similarly, functions describe local have envelope amplitudes. In way effectively emulate expressed “asperities” occasional occurrence large spikes near-source accelerograms. special simulate spatial coherence high-frequency motion. permits at high resolution, fulfilling prerequisite vicinity fault. particular realization (sample) created run depends several seeds, also considerable number parameters. Their values selected take into account features; they perturbed examine source-related component uncertainty specification well adapted study deterministic seismic hazard: it may individual scenario events, or suites such parameters class events. Examples given application simulations related estimation.