第92回ジオダイナミクスセミナー
　 　Geodynamics　Seminar

要　旨
　In this study, Generalized Ray Theory (Helmberger, 1974, 1983) is used for modelling local and regional waveforms in southwest Japan. A program for waveform analysis has been programmed. Manual iterative technique has been developed to retrieve the best model parameters. Several tests have been done to study the model parameter effects on the waveform modelling. The degree of fitting in each test is calculated by cross correlating the observed and synthetic seismograms. The test results of the model parameters for southwest Japan for the events used in this study propose 2 different models. Model 1 for Biwa lake paths characterized by a surface layer of 2.5 km thick, Vp=5.3 km/s, Vs=3.35 km/s, Conrad and Moho depths are 19 km and 33.3 km, respectively. For other paths, there is no surface layer and the Conrad and Moho depths are 15 km and 31 km, respectively. Our test results show that synthetic seismograms are very sensitive to focal depth and upper crust velocity and thickness. According to the best fittings obtained, we have constructed travel time curves for the most common crustal phases which are used to identify later crustal phases during the modelling process. Sorry for delay.







　　　　　　　　問い合わせ先：山崎　大輔 　TEL　　　（089）927-8408
　　　 　　　　　　　　　　　　　　　　E-mail　　yamazaki@sci.ehime-u.ac.jp