Evaluation of a novel application of earthquake HVSR in site-specific amplification estimation

Zhu, Chengjun; Pilz, Marco; Cotton, Fabrice

doi:10.1016/j.soildyn.2020.106301

Cited by 50 publications

(44 citation statements)

References 43 publications

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“…Inspired by Kawase, Chuanbin Zhu et al proposed a procedure to calibration of seismic HVSR amplitudes for direct amplification estimation, which verified that the empirical transfer function and HVSR were close to each other in both amplitude and spectral form in frequency range of f 0 to 25 Hz. There are also some studies combining with the geological conditions of the site [22]; Manisha et al showed the pseudo velocity response (PSV) and HVSR compared with the regional geological structure and summarized a clear relationship based on the geological settings in the area for most of the sites, and a distinct understanding is gained of the site effect evaluation [undefined]. Rocca et al showed that the HVSR of seismic noise always changes significantly during period of severe weather; the amplitude of background noise increases over a wide frequency band; that is the result of HVSR which is not only caused by the amplitude of ambient noise but also the climate and topographic effect, besides being correlated with day-night cycle [23].…”

Section: Site Effect Analysismentioning

confidence: 99%

The horizontal-to-vertical spectral ratio and its applications

Wang

2021

EURASIP J. Adv. Signal Process.

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The horizontal-to-vertical spectral ratio (HVSR) has been extensively used in site characterization utilizing recordings from microtremor and earthquake in recent years. This method is proposed based on ground pulsation, and then it has been applied to both S-wave and ambient noise, accordingly, in practical application also different. The main applications of HVSR are site classification, site effect study, mineral exploration, and acquisition of underground average shear-wave velocity structure. In site response estimates, the use of microtremors has been introduced long ago in Japan, while it has long been very controversial in this research area, as there are several studies reporting difficulties in recognizing the source effects from the pure site effects in noise recordings, as well as discrepancies between noise and earthquake recordings. In practice, the most reliable way is the borehole data, and the theoretical site response results were compared with the HVSR using shear wave to describe site response. This paper summarizes the applications of the HVSR method and draws conclusions that HVSR has been well applied in many fields at present, and it is expected to have a wider application in more fields according to its advantages.

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Section: Site Effect Analysismentioning

confidence: 99%

The horizontal-to-vertical spectral ratio and its applications

Wang

2021

EURASIP J. Adv. Signal Process.

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“…Equation ( 7) is H/V, and the transformation of equation ( 7) yields the following equation ( 8) (Zhu et al 2020a;2020b):…”

Section: Empirical Transfer Function (Etf)mentioning

confidence: 99%

“…So why does the vertical propagation of the P-wave affect the horizontal amplification of the S-wave? Parolai et al (2004) and Zhu et al (2020b) suggested that the vertical amplification is related to the propagation of the longitudinal wave (P-wave), which are mainly derived from the conversion of non-vertical propagating Sv waves at the main layer interface, and the wave pattern conversion of Sv-P waves at the soil interface transfers the wave energy to the vertical direction. This causes the wave energy to decrease in the horizontal direction and increase in the vertical direction, which is reflected in the equation 𝐻𝑉𝑆𝑅 = 𝐻 𝑉 as the horizontal spectral amplitude represented by H decreases and the vertical spectral amplitude represented by V increases so that the HVSR (H/V) decreases and eventually leads to the underestimation of the horizontal amplification of S-wave.…”

Section: Empirical Transfer Function (Etf)mentioning

confidence: 99%

“…The solid lines represent the average spectral ratio curves of historical weak and strong ground motion records It should be noted that although the corrected HVSR C can well improve the underestimation that occurs in the site amplification estimation when using HVSR S , equation ( 11) still has some limitations, i.e., it is only applicable for station with complete surface and borehole array records, so the correction method is not applicable for station without borehole records. For this reason, Kawase et al (2018) and Zhu et al (2020b) successively proposed universal SBSRp instead of site-specific SBSRp to correct HVSRs for direct estimation of surface horizontal amplification. In this paper, our research object, station MYGH10, has complete surface and borehole records, so only the equation ( 11) was used for the study.…”

Section: Empirical Transfer Function (Etf)mentioning

confidence: 99%

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Analysis of Site Amplification and Nonlinear Response Based on Ground Motion Records at MYGH10 Station in Japan

Zhang

Tao

Xie

et al. 2021

Preprint

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Strong horizontal ground motions with the peak ground acceleration (PGA) larger than 1400 gal were observed at Yamamoto (MYGH10) station during the February 2021 Mj 7.3 off the east coast of Honshu, Japan, Fukushima earthquake. Firstly, in this paper, we discussed and verified the theoretical assumptions of the “Nakamura” method under weak and strong ground motions. The site amplification factor of the MYGH10 station was estimated using the surface horizontal-vertical spectral ratio (HVSR) and the surface-to-borehole spectral ratio (SBSR), and the corrected HVSRC, respectively. Meanwhile, the reasons for underestimating the site amplification factor when using HVSR were explained. The vertical amplification phenomenon of seismic P-wave in the high-frequency band was analysed under weak and strong ground motions. Secondly, we utilized HVSR, SBSR, and theoretical transfer function (TTF) based on the 1D wave propagation theory to study the nonlinear site response of MYGH10 station under the mainshock of the Fukushima earthquake and the historically weak and strong ground motions, respectively. The changes in frequencies and amplitudes of the spectral ratio curves when nonlinearities were occurring at the site were analysed and compared using the spectra ratio curves of weak ground motion records and TTF as references. Finally, the recovery of the site after strong nonlinearity was also evaluated by comparing the spectral ratio curves of aftershocks records. We found that the most significant amplification factor of the site increased from 7 to more than 10, and the predominant frequency decreased from 10 Hz to 3.8 Hz under the mainshock of the Fukushima earthquake. The predominant frequency returned to the previous value within three days after the mainshock, but the amplification factor did not.

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“…Thus K-NET and KiK-net are among the most widely studied networks (e.g. Cabas et al, 2017; Cotton et al, 2008; Kaklamanos and Bradley, 2018; Kawase et al, 2019; Nakano et al, 2015; Ren et al, 2017; Zhu et al, 2020b). To further unleash the potentials of both K-NET and KiK-net networks, there is a need for an open-source site database.…”

Section: Introductionmentioning

confidence: 99%

An open-source site database of strong-motion stations in Japan: K-NET and KiK-net (v1.0.0)

et al. 2021

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This article describes an open-source site database for a total number of 1742 earthquake recording sites in the K-NET (Kyoshin network) and KiK-net (Kiban Kyoshin network) networks in Japan. This database contains site characterization parameters directly derived from available velocity profiles, including average wave velocities, bedrock depths, and velocity contrast. Meanwhile, it also consists of earthquake horizontal-to-vertical spectral ratio (HVSR) and peak parameters, for example, peak frequency, amplitude, width, and prominence. In addition, the site database also comprises topographic and geological proxies inferred from regional models or maps. Each parameter is derived in a consistent manner for all sites. This site database can benefit the application of machine learning techniques in studies on site amplification. Besides, it can facilitate, for instances, the search of the optimal site parameter(s) for the prediction of site amplification, the development and testing of ground-motion models or methodologies, as well as investigations on spatial or regional variability in site response. All resources (the site database, earthquake HVSR data at all sites, and the MATLAB script for peak identification) can be freely accessed via: https://doi.org/10.5880/GFZ.2.1.2020.006

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Evaluation of a novel application of earthquake HVSR in site-specific amplification estimation

Cited by 50 publications

References 43 publications

The horizontal-to-vertical spectral ratio and its applications

The horizontal-to-vertical spectral ratio and its applications

Analysis of Site Amplification and Nonlinear Response Based on Ground Motion Records at MYGH10 Station in Japan

An open-source site database of strong-motion stations in Japan: K-NET and KiK-net (v1.0.0)

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