ESTIMATION OF UNDERGROUND STRUCTURE AROUND THE SABAE FAULT BASED ON MICROTREMOR OBSERVATION

Material type: 文書・図像類

Author: KOJIMA, Keisukeほか

Publisher: GIZ2009実行委員会

Publication date: 2009-12

Material Format: Digital

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Note (General)：: Reliable Quaternary structure is indispensable in order to accurately predict the seismic damage of the region. We executed microtremor observations a...

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Material Type: 文書・図像類
Title: ESTIMATION OF UNDERGROUND STRUCTURE AROUND THE SABAE FAULT BASED ON MICROTREMOR OBSERVATION
Author/Editor: KOJIMA, Keisuke
YAMAMOTO, Hirofumi
NOGUCHI, Tasuya
OKAMOTO, Takuo
NAKAYA, Eiji
MOTO, Koudai
Author Heading: KOJIMA, Keisuke
YAMAMOTO, Hirofumi
NOGUCHI, Tasuya
OKAMOTO, Takuo
NAKAYA, Eiji
MOTO, Koudai
Publication, Distribution, etc.: GIZ2009実行委員会
Publication Date: 2009-12
Publication Date (W3CDTF): 2009-12
Periodical title: Proceedings of the International Symposium on Geo-informatics and Zoning for Hazard Mapping
Pages: 285-290
Text Language Code: eng
Subject Heading: Sabae Fault
microtremor observation
inversion
underground configuration
Target Audience: 一般
Note (General): Reliable Quaternary structure is indispensable in order to accurately predict the seismic damage of the region. We executed microtremor observations along the several exploration lines orthogonal to the Sabae Fault. The phase velocities of surface waves were calculated from the array observations by applying the spatial autocorrelation analysis. The dispersion curves were inverted to a vertical S-wave profile using a genetic algorithm. To interpolate the array observations, the single-point 3-components observations were made. It was confirmed that there were two predominant periods in the H/V spectrum and each predominant period were caused by the Alluvium and the Diluvium respectively. We estimated the Quaternary configuration from these predominant periods using the estimated S-wave velocities based on the quarter wavelength rule. The 3D S-wave structure model was proposed by using the vertical structure of the microtremor observation sites. Furthermore, we observed gravity anomaly and calculate the density structure. The validity of the estimated structure from the microtremor observation was confirmed by comparing with the density structure and with the existing deep well data. The estimated configuration showed that the Quaternary deposit has a folded mound near the Sabae fault and that the lower diluvium is shifting over 100m across the fault.
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ