Application of Hvsr for Site Characterization: State-Of-The-Art

Abstract eng:
Yutaka 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 (MHVSR) 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 earthquake site characterization in numerous regions, specifically, in the mapping of site period or fundamental frequency and inverted for shear-wave velocity depth profiles, respectively. 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.

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