3D Subsurface Structural Model for Strong Motion Simulation around Lake Biwa, Southwest Japan
3D Subsurface Structural Model for Strong Motion Simulation around Lake Biwa, Southwest Japan
复制标题
日本西南部琵琶湖周围强运动模拟的 3D 地下结构模型
DOI：
10.4294/zisin1948.58.2_91
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Y. Hayakawa
中科院分区：
文献类型：
--
作者：
Haruhiko Suzuki;M. Morino;K. Iwamoto;Y. Liu;H. Fujiwara;Y. Hayakawa
琵琶湖-青岸断裂带是日本最活跃的断裂带之一，位于日本琵琶湖西海岸附近。根据地震研究推进本部（2004年），30年内发生地震的概率为0.09%~ 9%。为了模拟由琵琶湖-西干断裂带破裂引起的强烈运动，我们构建了琵琶湖周围的三维地下结构模型。三维地下结构模型是利用地球物理和地质调查的数据和周围的琵琶湖。我们通过比较观测到的地震H/V谱比和理论值对模型进行了修正。利用改进的三维地下结构模型，我们模拟了中强地震的地面运动。结果表明，模拟得到的地面速度波形与实测波形吻合较好。通过地质方法，调整理论H/V谱比与实测H/V谱比，可以在地球物理观测资料较少的情况下，重建适用于强震模拟的三维地下结构模型。
Biwako-seigan fault zone is one of the most active faults in Japan, located around western shore of Lake Biwa. According to The Headquarters for Earthquake Research Promotion (2004), its probability of earthquake within 30 years is from 0.09% to 9%. To simulate strong motion, caused by the rupture of Biwako-seigan fault zone, we have constructed 3D subsurface structural model around Lake Biwa. The 3D subsurface structural model is constructed using the data of geophysical and geological surveys in and around Lake Biwa. We have modified the model by comparing the observed H/V spectral ratio between earthquakes and theoretical one. Using the modified 3D subsurface structural model, we simulated ground motions for moderate earthquakes. As the results, simulated waveforms of ground velocity agree well with observed ones. By the geological method and adjusting theoretical H/V spectral ratio to observed one, it is possible to re-construct 3D subsurface structural model which is applicable to strong motion simulation, even though there are few data of geophysical surveys.