Shear Wave Velocity Assessment offshore Fukushima by Analysis of HVSR from Coda Waves

Shear Wave Velocity Assessment offshore Fukushima by Analysis of HVSR from Coda Waves | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 12 June 2025 V1 Latest version Share on Shear Wave Velocity Assessment offshore Fukushima by Analysis of HVSR from Coda Waves Authors : Atikul Haque Farazi 0000-0002-1822-1421 [email protected] , Yoshihiro Ito 0000-0001-9484-9539 , Agostiny Marrios Lontsi , José Piña-Flores , Francisco J. Sánchez-Sesma , Emmanuel Soliman Mortel Garcia , Masanao Shinohara 0000-0003-1327-509X , Ryota Hino 0000-0001-5328-8421 , and Shukei Ohyanagi Authors Info & Affiliations https://doi.org/10.22541/au.174975675.54579257/v1 250 views 139 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Extracting deep subsurface information beneath the ocean is challenged due to temporally unstable oceanic noise levels, especially below 0.1 Hz, which limits the effectiveness of passive seismic methods such as horizontal-to-vertical spectral ratio (HVSR). In our previous work, we found that HVSR of ambient seismic noise (HVSRN) is unstable below 0.1 Hz at three broadband Ocean Bottom Seismometer (OBS) stations offshore Fukushima in the southern Japan Trench. To overcome this limitation, we present a novel approach that estimates HVSR using the coda of earthquakes (HVSRC). Multiple earthquakes with long-duration coda (≥200 s) enabled stable HVSRC estimation in the 0.05–10 Hz range, effectively extending the lower frequency limit for offshore HVSR. While HVSRC and HVSRN differ below 0.1 Hz, they exhibit similar curves between 0.1–10 Hz, confirming the reliability of HVSRC at ocean-bottom sites. Moreover, theoretical HVSRs below 0.2 Hz, computed using the local structure, show good agreement with observations. We inverted the average HVSRCs using the diffuse field assumption and the recently developed ’hvgeneralized’ algorithm, which accounts for the seawater layer, and obtained high-resolution 1D shear-wave velocity profiles down to 10,000 m depth. These profiles delineate sedimentary and crustal layers, and at one OBS station, we identified the Japan Trench plate interface at ~7,000 m depth. This study demonstrates that HVSRC can mitigate low-frequency instability in ocean-bottom HVSR using a straightforward approach and significantly extend its applicability from shallow subsurface investigations to deep marine crustal imaging. Supplementary Material File (1035731_0_merged_1749406654.pdf) Download 2.16 MB File (manuscript.docx) Download 5.95 MB File (supporting.docx) Download 77.19 MB Information & Authors Information Version history V1 Version 1 12 June 2025 Copyright This work is licensed under a Creative Commons Attribution 4.0 International License Keywords coda waves crustal structure diffuse field theory full hvsr inversion marine seismology shear wave velocity Authors Affiliations Atikul Haque Farazi 0000-0002-1822-1421 [email protected] University of Barishal View all articles by this author Yoshihiro Ito 0000-0001-9484-9539 Kyoto University View all articles by this author Agostiny Marrios Lontsi University of Buea View all articles by this author José Piña-Flores Universidad Veracruzana View all articles by this author Francisco J. Sánchez-Sesma Universidad Nacional Autónoma de México View all articles by this author Emmanuel Soliman Mortel Garcia University of the Philippines Diliman College of Science View all articles by this author Masanao Shinohara 0000-0003-1327-509X University of Tokyo View all articles by this author Ryota Hino 0000-0001-5328-8421 Tohoku University View all articles by this author Shukei Ohyanagi Kyoto Daigaku View all articles by this author Metrics & Citations Metrics Article Usage 250 views 139 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Atikul Haque Farazi, Yoshihiro Ito, Agostiny Marrios Lontsi, et al. Shear Wave Velocity Assessment offshore Fukushima by Analysis of HVSR from Coda Waves. Authorea . 12 June 2025. DOI: https://doi.org/10.22541/au.174975675.54579257/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. 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