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TitleApplication of MHVSR for site characterization: state-of-the-art
AuthorMolnar, S; Cassidy, J FORCID logo; Castellaro, S; Cornou, S; Crow, HORCID logo; Hunter, J A; Matsushisma, S; Sanchez-Sesma, F J; Yong, A
Source16th World Conference on Earthquake Engineering, Santiago, Chile; 4946, 2017 p. 1-13
Alt SeriesEarth Sciences Sector, Contribution Series 20160175
PublisherInternational Association of Earthquake Engineering
Meeting16th World Conference on Earthquake Engineering; Santiago; CL; January 2017
Mediapaper; on-line; digital
File formatpdf
Subjectstectonics; earthquakes; earthquake studies; modelling; Guidelines
Illustrationsgraphs; photographs; seismic velocity profiles
ProgramPublic Safety Geoscience Western Canada Geohazards Project
Released2017 01 01
AbstractYutaka Nakamura (1989; [1]) popularized the application of the horizontal-to-vertical spectral ratio (HVSR) analysis of microtremor (ambient noise or vibration) recordings to estimate the predominant frequency and amplification factor of earthquake shaking. During the following quarter-century, popularity in the microtremor HVSR (MHSVSR) method grew; studies have verified the stability of a site's MHVSR response over time and validated the MHVSR response with that of earthquake HVSR response. Today, MHVSR analysis is a popular reconnaissance tool used worldwide for seismic microzonation and site characterization in numerous regions. However, the ubiquity of MHVSR analysis is predominantly a consequence of its ease in application rather than our full understanding of its theory. We present the state-of-the-art in MHVSR analyses in terms of the development of its theoretical basis, current state of practice, and we comment on its future for applications in earthquake site characterization.
Summary(Plain Language Summary, not published)
This invited contribution to a Special Session on Best Global Practises in Determining Earthquake Site Response presents the state-of-the-art in methodologies using background seismic noise (including both theory and practise) to determine constraints on local earthquake shaking. With wave amplification of up to about ten times in some areas caused by local earth structure (both surface geology and deep structure), this is an important factor in evaluating earthquake hazard. We describe not only recent advances in techniques, but we also outline potential improvements in the methodology, and future applications in earthquake site characterization for use in building codes and other national codes and standards.

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