Examination of the S-wave velocity structures by the autocorrelation function using the strong motion records in the Ishikari Plain

Abstract

PreviousNext No AccessProceedings of the 14th SEGJ International Symposium, Online, 18–21 October 2021Examination of the S-wave velocity structures by the autocorrelation function using the strong motion records in the Ishikari PlainAuthors: Naofumi NakagawaNobuo TakaiMichiko ShigefujiNaofumi NakagawaHokkaido UniversitySearch for more papers by this author, Nobuo TakaiHokkaido UniversitySearch for more papers by this author, and Michiko ShigefujiKyushu UniversitySearch for more papers by this authorhttps://doi.org/10.1190/segj2021-081.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We applied the autocorrelation function (ACF) analysis to strong motion records observed at several stations in the Ishikari Plain, Hokkaido, Japan, in order to grasp the depth of the seismic basement. Recently, by applying ACF analysis to strong motion records, the depth of the seismic basement has been investigated, and the S-wave velocity (Vs) structure has been estimating with the stacked ACF. The Ishikari Plain has sedimentary layers with a thickness of several kilometers, which increases the amplitude and duration of seismic input motion to the plain. Sapporo City, which is the capital city in Hokkaido, is located on the plain and has several skyscrapers, as well as small and medium-sized buildings. It is important to evaluate an appropriate Vs structure to evaluate an appropriate building design input motion that contributes to mitigating building damage. It is also important to investigate the Vs structure using strong motion records. Some Vs structures were constructed with the microtremor exploration and reflection exploration in the Ishikari Plain. In this study, we apply the ACF analysis to strong motion data in this plain. We compared the observed ACFs with theoretical ones from existing Vs structures at each station. The calculated two-way travel times using the existing Vs structure are different from the arrival times of the reflected waves from the seismic basement by ACF analysis except for HKD183. Keywords: Ishikari Plain, autocorrelation function, strong motion record, seismic basementPermalink: https://doi.org/10.1190/segj2021-081.1FiguresReferencesRelatedDetails Proceedings of the 14th SEGJ International Symposium, Online, 18–21 October 2021ISSN (online):2159-6832Copyright: 2021 Pages: 349 publication data© 2021 Published in electronic format with permission by the Society of Exploration Geophysicists of JapanPublisher:Society of Exploration GeophysicistsSociety of Exploration Geophysicists of Japan HistoryPublished Online: 29 Nov 2021 CITATION INFORMATION Naofumi Nakagawa, Nobuo Takai, and Michiko Shigefuji, (2021), "Examination of the S-wave velocity structures by the autocorrelation function using the strong motion records in the Ishikari Plain," SEG Global Meeting Abstracts : 307-310. https://doi.org/10.1190/segj2021-081.1 Plain-Language Summary KeywordsIshikari Plainautocorrelation functionstrong motion recordseismic basementPDF DownloadLoading ...