ω^-2-scaling則に基づく経験的Green関数法による波形合成とfmax

Abstract

The source processes of a few earthquakes were checked by waveform simulation using the empirical Green's function technique based on the ω^-2-spectral scaling law. Synthetic waveforms were successfully fit to the observed ones, and their sources were supposed to be a single rupture. The small event used as the empirical Green's function in the synthesis of large event, could be synthesized with the smaller event. In the method of synthesis used here, it is considered that barriers on the fault plane are broken in the process of growth and mutual connection of small cracks. These let us guess that the stronger barriers were distributed sparsely and the weakers densely. And, according to the slip weakening model, it is supposed that the fmax depends on the barrier interval on the fault plane or small crack size. Supposing the distribution of barriers as given in the hierarchy model, some physical parameters will be able to be obtained from the observed f0-M0 relation and the fmax-M0 relation expected to be confirmed by observation. Thus, the fmax can be a new informant about heterogeneity in seismic source.