Application of horizontal-to-vertical (H/V) Fourier spectral ratio for analysis of site effect on rock (NEHRP-class B) sites in Taiwan

Sokolov, Vladimir; Loh, Chin‐Hsiung; Jean, Wen-Yu

doi:10.1016/j.soildyn.2006.09.001

Cited by 36 publications

(13 citation statements)

References 29 publications

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“…One of them in volves di vid ing the hor i zon tal-com po nent shear-wave spec tra at each site by the ver ti cal com po nent spec tra ob served si mul ta neously at that site (Lermo and Chavez-Gar cia 1993). The H/V tech nique, as has been shown re cently by many au thors (e.g., Field and Ja cob 1995;Theodulidis and Bard 1995;Theodulidis et al 1996;Bonilla et al 1997;Cas tro et al 1997;Chen and Atkinson 2002;Huang et al 2002;Siddiqqi and Atkinson 2002;Mucciarelli et al 2003;Sokolov et al 2005aSokolov et al , 2007, pro vides re sults that are con sis tent with the gen eral geological con di tions of the re cord ing sites, i.e., show ing the fundamen tal fre quency of site am pli fi ca tion. The re sults of the ap pli ca tion of the H/V tech nique, how ever, are af fected by lo cal and subsurface fac tors in flu enc ing the ver ti cal compo nent of ground mo tion.…”

Section: The Tech Niquementioning

confidence: 83%

“…The ter tiary base ment could not be con sid ered as "very hard rock" as used in our spec tral model. There fore, when com par ing the VHR ra tios and re sults of the the oretical mod el ing, the gen er al ized hard-rock am pli fi ca tion (see Sokolov et al 2007) was added to the 1D mod el ing.…”

Section: Re Sults and Discussionmentioning

confidence: 99%

“…Among the fac tors we can mention, for ex am ple, the fol low ing: (a) con tri bu tion of compressional de for ma tion (P-wave) to ver ti cal com po nent at fre quen cies more than 8 -10 Hz (Beresnev et al 2002); P-wave con ver sion from the SV-waves at the bound aries of the lay ers above the base rock (e.g., Takahashi et al 1992); in crease of am pli tudes at ver ti cal com po nent due to nonlinear ef fects in gran u lar ma te ri als (Loukachev et al 2002). Such ef fects may be min i mized by us ing data only from rock sta tions (e.g., Chen and Atkinson 2002;Sokolov et al 2005aSokolov et al , 2007.…”

Section: The Tech Niquementioning

confidence: 99%

“…On the other hand, when us ing a large enough num ber of events var ied by mag ni tude, source depth and az i muth, the ef fects of fo cal mech a nism and directivity are ex pected to be av er aged out. The approach was ap plied to eval u ate the char ac ter is tics of spec tral am pli fi ca tion for (1) par tic u lar sites in Tai pei ba sin (Sokolov et al 2000Sokolov and Jean 2002;) and (2) gen er alised site con di tions (classes) in Tai wan (Sokolov et al 2003(Sokolov et al , 2004(Sokolov et al , 2007.…”

Section: The Tech Niquementioning

confidence: 99%

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Analysis of Taipei Basin Response for Earthquakes of Various Depths and Locations Using Empirical Data

Sokolov¹,

Wen²,

Miksat³

et al. 2009

Terr. Atmos. Ocean. Sci.

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AB STRACTThe re sponse of Tai pei ba sin upon earth quake ex ci ta tion was stud ied us ing re cords of re cent earth quakes. The strong-mo tion da ta base in cludes re cords ob tained at 32 sta tions of the Tai pei TSMIP net work from 83 deep and 142 shal low earth quakes (M > 4.0) that oc curred in 1992 -2004. The char ac ter is tics of fre quency-de pend ent site re sponse were ob tained as spec tral ra tios be tween the ac tual earth quake re cords (hor i zon tal com po nents) and those mod elled for a hy po thet i cal Very Hard Rock (VHR) con di tion. The mod els for VHR spec tra of Tai wan earth quakes had been re cently pro posed by Sokolov et al. (2005bSokolov et al. ( , 2006. Anal y sis of site re sponse char ac ter is tics and com par i son with sim ple 1D mod els of the soil col umn re sulted in the fol low ing con clu sions: (1) The spec tral ra tios through out the ba sin ob tained from deep earth quakes (depth > 35 km) ex hibit good agree ment with the the o ret i cal ra tios cal cu lated us ing the 1D mod els con structed us ing avail able geo log i cal and geotechnical data. (2) The spec tral ra tios ob tained from shal low earth quakes show in flu ence of: (a) sur face waves gen er ated when trav el ling from dis tant sources to the ba sin and (b) rel a tively low-fre quency (< 1 -2 Hz) waves gen er ated within the ba sin. (3) Some shal low earth quakes pro duce ex tremely high am pli fi ca tion at fre quen cies 0.3 -1 Hz within the ba sin that may be dan ger ous for high-rise build ings and high way bridges. (4) The ob tained re sults may be used in proba bil is tic seis mic microzonation of the ba sin when many pos si ble earth quakes lo cated at various distances are considered. 2D and 3D simulation is necessary to model the seismic influence from particularly large earthquakes. Sci., 20, 687-702, doi: 10.3319/TAO.2008.10.15.01(T) IN TRO DUC TIONSeis mic ity in the Tai wan area is very high, and many large earth quakes (M > 6.5) have oc curred in the re gion in his tor i cal and mod ern times. Some of these earth quakes, e.g., the re cent Chi-Chi earth quake of 21 Sep tem ber 1999, caused se vere dam age. Tai pei City is the cap i tal of Tai wan and is lo cated on a sed i ment-filled ba sin in the north ern part of the is land. The area has ex pe ri enced sev eral dam ag ing earth quakes, the most re cent of which oc curred on 31 March 2002. The re sults of pre vi ous re search on earth quake ground mo tion pe cu liar i ties in the Tai pei ba sin (e.g., Kuo et al. 1995;Wen et al. 1995;Loh et al. 1998; Wen and Peng 1998a, b;Sokolov and Jean 2002;Wang and Lee 2002;Chen 2003;Fletcher and Wen 2005) showed that large lat eral vari a tions in ground-mo tion char ac ter is tics (peak ground ac cel er ation, re sponse spec tra, dom i nant fre quen cies, etc.) are appar ent.Re cent needs of earth quake en gi neer ing re quire consideration of site ef fect in seis mic haz ard anal y sis. When ap plying the proba bil is tic ap proach for seis mic haz ard es tima tion in ur ban ter ri to ries, it is...

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Section: The Tech Niquementioning

confidence: 83%

Section: Re Sults and Discussionmentioning

confidence: 99%

Section: The Tech Niquementioning

confidence: 99%

Section: The Tech Niquementioning

confidence: 99%

See 2 more Smart Citations

Analysis of Taipei Basin Response for Earthquakes of Various Depths and Locations Using Empirical Data

Sokolov¹,

Wen²,

Miksat³

et al. 2009

Terr. Atmos. Ocean. Sci.

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“…The principle is to evaluate spectral ratios, from which the peak site frequency (fundamental frequency) and the associated amplification factor could be determined. This method has been widely utilized for the onland area, including the determination of seismic microzonation (Bour et al 1998;Lee et al 2001;LeBrun et al 2004), seismic site effect evaluation (e.g., Sokolov et al 2007), bedrock depth mapping (Ibs-von Seht and Wohlenberg 1999), and shallow soil shear-wave velocity structure profiling (e.g., Scherbaum et al 2003), etc. However, few studies have been introduced for the marine area, where site characterizations are even more difficult to investigate than those onland.…”

Section: Introductionmentioning

confidence: 99%

Seismic site response of submarine slope offshore southwestern Taiwan

Lin¹,

Chen²,

Su³

et al. 2018

Terr. Atmos. Ocean. Sci.

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Widely distributed Bottom-Simulating Reflectors (BSRs) have been observed in the area offshore of southwestern Taiwan where the active accretionary complex meets with the passive China continental margin. In order to clarify the link between seismic site response and sedimentary properties of submarine slope, we evaluate the response of seafloor sediments in regard to passive dynamic loads. The local site effect produced by shallow marine sediments was characterized by estimating the horizontal-to-vertical (H/V) spectral ratios of data recorded by the short-period Ocean Bottom Seismometers (OBSs). The results show that the maximal H/V ratios appeared in the range of 3.66 -9.28 Hz, suggesting that the fundamental frequency is dominated by the effect related to the very shallow sediments. For most stations, the H/V ratios estimated based on the earthquakes and noise records were characterized by different patterns. Relatively broad H/V pattern was obtained when the signals were extracted from earthquakes. This phenomenon may be related to soil nonlinearity when a stronger motion applies. In comparison with the available geological structures and bulk density distribution obtained from coring experiments, we found a relatively higher fundamental frequency of about 8 -9 Hz for the more rigid material, such as mud diapir and folding axes. For most of the area along the slope, the fundamental frequency shows a relatively low value, about 6 -8 Hz. Finally, when a site is characterized by thick or lowest bulk density sedimentary layer, we observed a fundamental frequency lower than 5 Hz, which is the lowest in our assessment.

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Engineering Seismology

Sharma

2018

Advances in Indian Earthquake Engineering and Seismology

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Application of horizontal-to-vertical (H/V) Fourier spectral ratio for analysis of site effect on rock (NEHRP-class B) sites in Taiwan

Cited by 36 publications

References 29 publications

Analysis of Taipei Basin Response for Earthquakes of Various Depths and Locations Using Empirical Data

Analysis of Taipei Basin Response for Earthquakes of Various Depths and Locations Using Empirical Data

Seismic site response of submarine slope offshore southwestern Taiwan

Engineering Seismology

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