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Separation of Rayleigh Wave from Ambient Noise Data by Instantaneous Polarization
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 24th European Meeting of Environmental and Engineering Geophysics, Sep 2018, Volume 2018, p.1 - 5
Abstract
As the cities have grown and unfortunately many of them have been built on the zones with high seismicity, the need for a perfect site response study become vital. One of the most common methods which is fast and easy to apply is microtremore analysis. As there are controversial ideas about its content therefore different research lines have been introduced.
defining site response, H/V technique is very popular although the amplitude of the H/V ratio is very tricky. Nakamura defines the horizontal spectrum by applying geometric mean of the radial and transverse component and divide it to the vertical spectrum of ambient noise and ignore the role of Love waves which cause the contamination of horizontal component that underestimate the H/V amplitude.
In order to overcome this defect, two techniques named RayDec (2009) and HVIP (2017) are applied to separate the Rayleigh waves and then obtain the H/V ratio, which is ellipticity curve in this case.
Finally the results of the three techniques, Nakamura, HVIP and RayDec are compared and the effectiveness of HVIP in comparison with the other techniques specially to detect the secondary peak of the H/V curve which is relevant to the first higher mode is concluded.