S-wave velocity structure using microtremor array measurements: a case study at Huffman Dam, OH, US

PreviousNext No AccessProceedings of the 13th SEGJ International Symposium, Tokyo, Japan, 12–14 November 2018S-wave velocity structure using microtremor array measurements: a case study at Huffman Dam, OH, USAuthors: Yoshiya OdaErnest C. HauserShelly GillilandYoshiya OdaTokyo Metropolitan UniversitySearch for more papers by this author, Ernest C. HauserWright State UniversitySearch for more papers by this author, and Shelly GillilandWright State UniversitySearch for more papers by this authorhttps://doi.org/10.1190/SEGJ2018-089.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract To estimate S-wave velocity structure, microtremor miniature array measurements were carried out at 10 points along a transect crossing a valley filled with glacial alluvium at Huffman Dam, Dayton, OH. At each point, 3 sensors were installed on the ground surface at two different circle arrays of 0.6m and 4m radius. The recording time for each array was 16 minutes and 30 minutes, respectively. We employed the CCA method to obtain the phase velocity at each point which was inverted to a 1D S-wave velocity profile. The H/V spectral ratio (HVSR) was also computed at each point. Using these data we obtained the S-wave velocity structure down to bedrock and the structure of the buried valley. The S-wave velocity structure we obtained in this study has good correlation with the geological cross section from well data. In addition, the resonant frequencies of H/V at each point corresponded with basement, although these H/V results indicate important resonance boundaries are present within the glacial valley fill which can confuse the depth-to-bedrock interpretation. These results show that microtremor array measurements are an efficient way to obtain shallow S-wave velocity structure and are an important supplement to HVSR analysis. Keywords: Microtremor, Miniature array, CCA, HVSR, S-wave velocity, Huffman DamPermalink: https://doi.org/10.1190/SEGJ2018-089.1FiguresReferencesRelatedDetails Proceedings of the 13th SEGJ International Symposium, Tokyo, Japan, 12–14 November 2018ISSN (online):2159-6832Copyright: 2019 Pages: 588 publication data© 2018 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 Apr 2019 CITATION INFORMATION Yoshiya Oda, Ernest C. Hauser, and Shelly Gilliland, (2019), "S-wave velocity structure using microtremor array measurements: a case study at Huffman Dam, OH, US," SEG Global Meeting Abstracts : 347-350. https://doi.org/10.1190/SEGJ2018-089.1 Plain-Language Summary KeywordsMicrotremorMiniature arrayCCAHVSRS-wave velocityHuffman DamPDF DownloadLoading ...