Digital transformation

[DX-03] Introduction to autonomous and integrated H/V database for site characterization

*Koichi Hayashi¹, Takaho Kita², Toru Suzuki³, Stefan Burns⁴, Takako Takahashi¹, Chisato Konishi¹, Haruhiko Sazuki¹, Hisanori Matsuyama¹ (1. OYO Corporation (Japan), 2. Ocean Engineering Corporation (Japan), 3. Mony Geophysical Exploration (Japan), 4. Geometrics (United States of America))

We developed a database of geophysical investigation results particularly for S-wave velocity (Vs) profiles, dispersion curves or horizontal to vertical spectral ratios (H/V) obtained from single station three component microtremor measurements, microtremor array measurements (MAM), or surface wave measurements. Our database is open to the public and users can upload their measurement results and share them with community through internet. The system consists of autonomous seismographs and processing software on mobile devices so that users can easily measure ambient noises, calculate Vs profiles and/or H/V and upload the results to the database. The database is integrated with other public databases and users can process and interpret geophysical data together with shallow to deep subsurface information in the other databases. We measured H/V and Vs profiles approximately 1300 and 700 sites respectively and opened to the public. Our data in the database demonstrated that dense H/V measurements provided valuable shallow to deep subsurface information to site characterization.