Mechanism of a character of Suwa basin to amplify earthquake motion from certain direction

诹访盆地特征对某一方向地震运动的放大机制

• 批准号: 15560490
• 负责人: TAMORI Shinichiro
• 金额: $ 0.96万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560490/
• 关键词: microtremor observation; array observation; Spac; s-wave velocity; Vスペクトル; 異常震域; S波速度構造; 一点移動観測; S波地盤構造; 常備微動観測; アレー観測; 地下構造

We made microtremor observation at the Suwa Basin. Site for array observations of vertical motion of the ground are Okaya, Toyota, Ogawa, Suwa minami and Fumide. A spac method was applied to obtain phase velocity of surface wave. We detected depth and s-wave velocity using a genetic algorithm. We also made observation of vertical and horizontal motion of the ground at forty points on Suwa basin. We calculated H/V spectra from the observation and detected s-wave velocity of soil layers at the forty points of Suwa basin. Finally, we made 3-D s-wave velocity model of Suwa basin. Depth of bed rock is from 2.7 km to 4.3 km and its s-wave velocity is about 4 km/s and that for layer which s-wave velocity is 400 m/s are form 20 m to 130 m. The depth of bed rock is deep at central part of the base and it is sallow at the edge. The length of the basin is 15 km and its width is 5 km. This Long and slender shape and the fact that depth of the bed rock is deep at the central part of the basin made amplify earthquake motion from certain direction.

我们在苏瓦盆地进行了微震观测。地面垂直运动的阵列观测地点为冈谷、丰田、小川、水和南和富井。采用空间法计算表面波相速度。我们用遗传算法检测深度和横波速度。我们还在苏瓦盆地的40个点上观测了地面的垂直和水平运动。利用观测资料计算H/V谱，并对苏洼盆地40个测点的土层s波速进行了探测。最后，建立了苏洼盆地三维横波速度模型。基岩深度为2.7 ~ 4.3 km，纵波速度约为4 km/s，纵波速度为400 m/s的层位纵波速度为20 ~ 130 m。基底中部基岩深度深，边缘浅。盆地长15公里，宽5公里。这种细长的形状和盆地中部基岩深度较深的事实，从一定方向上放大了地震运动。

项目成果

S-wave profile at Suwa basin using microtremor obserbation

利用微震观测获得诹访盆地横波剖面

• 发表时间: 2004
• 期刊: Summaries of technical papers of annual meeting architectural institute of Japan B-2
• 作者: Takahiro Hirano;Shinichiro Tamori
• 通讯作者: Shinichiro Tamori

諏訪盆地における常時微動によるS波速度構造の推定

基于诹访盆地微震的横波速度结构估算

• 发表时间: 2004
• 期刊: 日本建築学会大会学術講演梗概集 B-2
• 作者: 平野貴識;田守伸一郎
• 通讯作者: 田守伸一郎

諏訪盆地における常時微動観測-地盤の卓越周期とボーリングデータより推定される地盤構造との関係-

诹访盆地的连续微震观测 - 根据钻孔数据推算的地面主周期与地面结构的关系 -

• 发表时间: 2003
• 期刊: 日本建築学会大会学術講演梗概集 B-2
• 作者: 田守伸一郎;松尾聡
• 通讯作者: 松尾聡

Microtremor observation at Suwa basin. -Relation between predominant period of the ground and sub-soil data-

诹访盆地的微震观测。

• 发表时间: 2003
• 期刊: Proc.of annual meeting of Hokuriku chapter, architectural institute of Japan
• 作者: Shinichiro Tamori;Matsuo Stioshi
• 通讯作者: Matsuo Stioshi