Author:
Abdelwahed Mohamed F.,Zhao Dapeng
Abstract
Abstract
The crustal structure beneath southwest Japan is investigated through waveform modellings of four local crustal earthquakes by using the generalized ray theory. High-quality seismograms recorded by the Hi-net seismic network are used. The focal mechanism solutions of the events used are estimated by using the first P-wave polarity data. Twenty-nine paths are used to characterize the crustal waveguide in SW Japan. Optimal 1-D velocity models for different paths are derived individually by waveform modelling. Synthetic tests are conducted to study the effects of different model parameters and to confirm the focal mechanism solutions. Modelling the waveforms individually is proven applicable for the heterogeneous regions. The resulted synthetics match the observed seismograms well. Considerable variations of the Conrad and Moho depths are found in the study area. The Conrad depth ranges from 14.8 to 19.7 km, and the Moho depth ranges from 28.4 to 33.4 km. Considerable variations in the crustal structure are found for the eastern portion of the study area where Biwa Lake lies. The effects of Biwa Lake on different paths are examined in detail.
Publisher
Springer Science and Business Media LLC
Subject
Space and Planetary Science,Geology
Reference32 articles.
1. Ali, M., H. Oda, A. Hayashida, K. Takemura, and M. Torii, Holocene paleomagnetic secular variation at Lake Biwa, central Japan, Geophys. J. Int., 136, 218–228, 1999.
2. Blair, D. P. and A. T. Spathis, Seismic source influence in pulse attenuation studies, J. Geophys. Res., 89, 9253–9258, 1984.
3. Dreger, D., Modeling earthquakes with local and regional broadband data, Ph.D. Thesis, California Institute of Technology, Pasadena, California, 1993.
4. Dreger, D. and D. V. Helmberger, Broad-band modeling of local earthquakes, Bull. Seism. Soc. Am., 80, 1162–1179, 1990.
5. Dreger, D. and D. V. Helmberger, Determination of source parameters at regional distances with three-component sparse network data, J. Geophys. Res., 98, 8107–8125, 1993.
Cited by
16 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献