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SPATIAL CHARACTERISTICS AND VISUAL EVALUATION OF STRONG GROUND MOTION ON 3-D SEDIMENTARY BASINS WITH THE AID OF PARALLEL COMPUTING

并行计算辅助下三维沉积盆地强地震动空间特征及视觉评价

基本信息

批准号：
08455257
负责人：
SHINOZAKI Yuzo
金额：
$ 4.99万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455257/
关键词：
Sedimentary basin boundary element method Parallel computing Green function Fault source

项目摘要

A direct three-dimensional boundary element method is applied to evaluate seismic responses in three-dimensional sedimentary basin to estimate the amplification characteristics of the ground motions in the heavily damaged belt zone in Kobe City during the 1995 Hyogoken eathquake. We have applied a direct 3-D boundary element method to evaluate seismic waves in a 3-D sedimentary basin due to 1)plane waves, 2)point sources, and 3)Haskel type fault. We have utilized the Green's functions for an elastic half-space medium. The accuracy of the Green's functions was verified through comparison of the numerical results with those obtained by other methods.Firstly, we considered the incidence of plane waves of the P,SH,and SV waves. The dispersion curves of the fundamental modes of the surface waves for the two layred model of these velocity structures are, shown. From frequency domain results we computed synthetic seismograms using the FFT algorithm. Those responses clearly show propagation of … More Love waves generated from edge of the sedimentary basin. Thef also show that the center of the basin is most amplified since Love waves as well as Rayleigh waves generated from edge of the sedimentary basin propagate toward the center of the basin, and though several sites near the edge show some amplification, the magnitude of amplification remains to be less about 1.3 times than theremaining sites.Secondly, we calculated the seismic motion of the basin to a point source. It is seen that body waves, i.e., SH waves, first arrive at the sites and then Love waves generated from the basin edge propagate forward along the longitudinal direction and propagate backward reflected from the other basin edge. It is also seen that though the body waves decay with the increase of source-receiver distance, Love waves do not decay because the material property of the basin is assumed to be a perfect elastic medium.It seems that the effect of angle of inclination of medium interface on the surface responses is small.Finally, we calculated the seismic motion of the basin to a Haskell type fault source. Numerical results show that ground motions of some restricted area near basin edge are most amplified and that it is qualitatively verified that the amplification chariacterstics of the ground motions in the heavily damaged belt zone in Kobe city. Less

采用直接三维边界元法评价三维沉积盆地的地震响应，估算1995年兵库县地震期间神户市严重受损带区地震动的放大特征。我们应用直接 3-D 边界元方法来评估 3-D 沉积盆地中由 1) 平面波、2) 点源和 3) Haskel 型断层引起的地震波。我们利用弹性半空间介质的格林函数。通过与其他方法得到的数值结果的比较，验证了格林函数的准确性。首先，考虑了P波、SH波和SV波的平面波的入射情况。显示了这些速度结构的两层模型的表面波基模的频散曲线。根据频域结果，我们使用 FFT 算法计算了合成地震图。这些响应清楚地表明了沉积盆地边缘产生的爱波的传播。研究还表明，由于沉积盆地边缘产生的拉夫波和瑞利波向盆地中心传播，盆地中心的放大程度最大，虽然靠近边缘的几个地点显示出一定的放大，但放大幅度仍小于其余地点的1.3倍左右。其次，我们计算了盆地的点源地震运动。可以看出，体波，即SH波，首先到达该地点，然后从盆地边缘产生的Love波沿纵向向前传播，并从另一盆地边缘反射回来向后传播。还可以看出，尽管体波随着震源-接收距离的增加而衰减，但Love波并没有衰减，因为盆地的物质性质被假设为完美的弹性介质。看来介质界面的倾角对地表响应的影响很小。最后，我们计算了盆地对Haskell型断层震源的地震运动。数值结果表明，靠近盆地边缘的一些限制区域地震动放大最为明显，定性地验证了神户市重灾带区地震动的放大特征。较少的