Generation of Basin-Induced Surface Waves Observed in the Tokachi Basin, Hokkaido, Japan
Generation of Basin-Induced Surface Waves Observed in the Tokachi Basin, Hokkaido, Japan
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在日本北海道十胜盆地观测到的盆地诱发表面波的产生
DOI：
10.4294/jpe1952.45.287
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Furumura
中科院分区：
文献类型：
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作者：
M. Furumura;T. Sasatani;T. Furumura
最近在盆地台深地震记录中观测到的盆地诱发面波的研究表明，面波的激发强度随着地震和盆地形状的变化而变化。我们选择了日本北海道的Tokachi盆地作为试验点，通过观测和数值研究相结合的方法，研究了盆地诱发的面波随地震的变化。对盆地和岩石场地观测到的邻近和中深度地震的地震记录进行了详细的对比，结果表明，主频约为0.3 Hz的盆地诱发面波的激发强度强烈地依赖于撞击盆地的S波的频率含量和入射角度。利用伪谱方法对SH波场和P-SV波场进行了二维模拟，成功地再现了入射S波的频率成分和入射角度的影响。模拟结果还表明，盆地边缘坡度在激发盆地诱发的表面波中起着重要作用。
Recent studies on basin-induced surface waves observed in deep earthquake seismograms at basin stations have shown that the excitation strength of the surface waves varies with earthquakes, as well as the basin shapes. We investigated the variation in basin-induced surface waves with earthquakes by a combination of observational and numerical studies, selecting the Tokachi Basin, Hokkaido, Japan, as the test site. A detailed comparison between the seismograms observed at the basin and rock sites for nearby and intermediate-depth earthquakes shows that the excitation strength of basin-induced surface waves with a predominant frequency of about 0.3 Hz strongly depends on the frequency content and incident angle of S-waves impinging on the basin. The observational results are complemented with two-dimensional modelings of SH and P-SV wavefields using the pseudospectral method, which successfully reproduce the effects of the frequency content and incident angle of incident S-waves. The simulation results also show that the basin edge slopes play an important role in the excitation of basin-induced surface waves.