Earthquake Disaster Evaluation Based on Estimation of Deep Underground Structure and Observation of Strong Ground Motion in Deep Sedimentary Basins

基于深层地下结构估算和深层沉积盆地强地震动观测的地震灾害评估

• 批准号: 10480090
• 负责人: SASATANI Tsutomu
• 金额: $ 3.65万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10480090/
• 关键词: deep sedimentary basin; Sapporo urban region; deep underground structure; microtremore exploration method; strong motion observation; site amplification; spatial variation of seismic response; seismic intensity; 微動探査法; 微動のアレイ観測; 地震波への盆地端部効果; ゾー

Our target area is Sapporo urban region with almost 2 millions population, that is located on a deep sedimentary basin. We have conducted research there on the following five heads: 1) geological environment, 2) seismological environment, 3) deep underground structure, 4) strong motion observation, and 5) evaluation of earthquake disaster.Our research results are:・ We have obtained a few deep-boring data to a depth of about 4000 m. The geological structure shows that the deepest core has a geological time of Miocene (Tertiary).・ We have obtained PS logging data to a depth of about 500 m at several sites. They show spatial variation of P- and S- wave velocity structures.・ We have estimated deep underground structures at several sites by the microtremor exploration method. The basement has S-wave velocity of about 3000 m/s.・ We have carried out a strong motion observation at 15 sites. The data show spatial variation of the seismic response and strong excitation of basin surface waves.・ We have examined the effects of underground structures on seismic motion based on obtained strong motion data. The examination shows an importance of deep underground structures in evaluation of site amplification.・ We have found some relationships between seismic intensity distribution and underground structure.

我们的目标区域是札幌市区，人口近200万，位于一个深沉积盆地上。我们从地质环境、地震环境、深部地下构造、强震观测、震害评价等五个方面进行了研究，取得的研究成果是：1)获得了几个深度约4000米的钻孔资料，地质构造表明，最深的岩心地质时代为中新世(第三纪)。·我们已经在几个地点获得了深度约500米的PS测井数据。它们表现出P波和S波速度结构的空间变化。·我们用微震探测法估计了几个地点的深层地下结构。基底的S波速度约为3000m/S。·我们在15个地点进行了强震观测。数据显示了地震响应的空间变化和盆地面波的强烈激发。·基于获得的强震数据，我们研究了地下结构对地震运动的影响。研究表明，深部地下结构在场地扩容评价中具有重要意义。·发现了地震烈度分布与地下结构之间的一些关系。

项目成果

吉田邦一: "ボアホール地震計アレイ記録による札幌市における堆積層の地震応答"北海道大学地球物理学研究報告. 63(印刷中). (2000)

吉田邦一：“基于钻孔地震阵列记录的札幌市沉积层的地震响应”北海道大学地球物理研究报告（2000年）。

武田美奈子: "札幌市における地震動応答特性" 北海道大学地球物理学研究報告. 61. 35-58 (1998)

武田美奈子：《札幌市地震反应特征》北海道大学地球物理研究报告 61. 35-58 (1998)。

K.Irikura: "The Effects of Surface Geology on Seismic Motion"A.A.BALKEMA/ROTTERDAM/BROOKFIELD. 1238 (1998)

K.Irikura：“地表地质对地震运动的影响”A.A.BALKEMA/鹿特丹/布鲁克菲尔德。

Kasahara. M. and K. Miyazaki: "Historical and recent seismic activities in Sapporo and vicinity."Geophys. Bull. Hokkaido Univ.. No.61. 239-262 (1998)

笠原。

Sasatani, T., H. Okada. K. Yoshida, O. Nakano, Y. Koreishi, T. Kobayashi and S. Ling: "Underground-structure estimation and strong motion observations at Maeda in Teine ward, Sapporo city."Pro. The 98ィイD1thィエD1 SEGJ Conference. 140-144 (1998)

Sasatani，T.，H. Okada，K. Yoshida，O. Nakano，Y. Koreishi，T. Kobayashi 和 S. Ling：“札幌市手稻区前田的地下结构估计和强运动观测”。第 98 届 D1 D1 SEGJ 会议。140-144 (1998)