濃尾平野における地震動シミュレーション
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概要
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Nagoya City, one of the largest cities in Japan,is located on the Nobi basin where the future occurrence of Tokai and /or Tonankai earthquake disasters is feared. The prediction of strong ground motions in this region is a pressing concern in order to mitigate these disasters. In this study,I constructed a subsurface velocity structure model for an area of 60 Km×40 Km in the Nobi basin on the basis of geophysical exploration data. Basement structure of the Nobi basin has the following features. Large vertical offsets of 2.0 to 2.5Km exist between the mountain area and the sediment site at the western boundary of the basin by the Yoro fault. The basement beneath the plain gradually becomes shallower toward the northeast direction,and the outcrop of the basement rock is observed at approximately 40 Km from the Yoro fault. I assume four sedimentary layers on basement. This model explained the observed PS-P times at most sites.Next I carried out 3D finite-difference waveform modeling for two events. The maximum amplitudes and waveforms of S-wave were reproduced well at most sites by the simulation. The generation and propagation of the Rayleigh wave were also reproduced by the simulation. These results indicate the validity of the proposed 3D velocity model.However,some differences were seen in the propagation character of the Rayleigh wave. These are discrepancies between observed and simulated group velocities of the Rayleigh wave. These differences suggest that proposed model have to be modified in detail.
- 2006-03-15
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