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Amplification of thickness and stratigraphy of loess deposit on seismic ground motion in the Yellow River Basin.

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Title: Amplification of thickness and stratigraphy of loess deposit on seismic ground motion in the Yellow River Basin.
Authors: Wang, Huijuan1,2,3, Zhang, Jinghua1 wangping@gsdzj.gov.cn, Wang, Ping2,3
Source: Earthquake Science. Feb2026, Vol. 39 Issue 1, p32-50. 19p.
Subject Terms: *Ground motion, *Earthquake hazard analysis, *Event stratigraphy, *Computer simulation, *Shaking table tests, *Physiographic provinces, *Sedimentation & deposition
Geographic Terms: Yellow River (China)
Abstract: The widely distributed loess deposits in the Yellow River Basin exhibit unique engineering geological characteristics. The variations in their thickness and stratigraphic structure significantly amplify ground motion parameters, directly influencing the regional seismic hazard risk level. This study methodically conducted on-site studies and observations of building collapses and damages resulting from seismic amplification effects, using the Wenchuan M 8.0 earthquake as a case study. Comprehensive experimental and numerical simulation studies were carried out. A large-scale shaking table test was performed, and numerical models for 14 different loess sites types were established. Various types of seismic waves were incorporated into these models for systematic numerical simulation calculations. The research reveals the mechanisms by which loess deposit thickness and stratigraphic structure in the Yellow River Basin affect seismic ground motion amplification. The results indicate that as the epicentral distance increases, the peak ground motion shows a marked attenuation trend, with the horizontal component attenuating substantially faster than the vertical component. As the overlying loess layer thickness increases from 50 to 100 m, the seismic intensity may escalate by 3-4 degrees, and the peak acceleration may amplify by 1.5-2.2 times. With the augmentation of loess deposit thickness and the proliferation of soil layers, both the peak acceleration response spectrum and the characteristic period demonstrate an upward tendency, exhibiting slight fluctuations contingent upon the seismic wave type. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 191161970
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Amplification of thickness and stratigraphy of loess deposit on seismic ground motion in the Yellow River Basin.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Huijuan%22">Wang, Huijuan</searchLink><relatesTo>1,2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Jinghua%22">Zhang, Jinghua</searchLink><relatesTo>1</relatesTo><i> wangping@gsdzj.gov.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Ping%22">Wang, Ping</searchLink><relatesTo>2,3</relatesTo>
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  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Earthquake+Science%22">Earthquake Science</searchLink>. Feb2026, Vol. 39 Issue 1, p32-50. 19p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Ground+motion%22">Ground motion</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+hazard+analysis%22">Earthquake hazard analysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Event+stratigraphy%22">Event stratigraphy</searchLink><br />*<searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br />*<searchLink fieldCode="DE" term="%22Shaking+table+tests%22">Shaking table tests</searchLink><br />*<searchLink fieldCode="DE" term="%22Physiographic+provinces%22">Physiographic provinces</searchLink><br />*<searchLink fieldCode="DE" term="%22Sedimentation+%26+deposition%22">Sedimentation & deposition</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Yellow+River+%28China%29%22">Yellow River (China)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The widely distributed loess deposits in the Yellow River Basin exhibit unique engineering geological characteristics. The variations in their thickness and stratigraphic structure significantly amplify ground motion parameters, directly influencing the regional seismic hazard risk level. This study methodically conducted on-site studies and observations of building collapses and damages resulting from seismic amplification effects, using the Wenchuan M 8.0 earthquake as a case study. Comprehensive experimental and numerical simulation studies were carried out. A large-scale shaking table test was performed, and numerical models for 14 different loess sites types were established. Various types of seismic waves were incorporated into these models for systematic numerical simulation calculations. The research reveals the mechanisms by which loess deposit thickness and stratigraphic structure in the Yellow River Basin affect seismic ground motion amplification. The results indicate that as the epicentral distance increases, the peak ground motion shows a marked attenuation trend, with the horizontal component attenuating substantially faster than the vertical component. As the overlying loess layer thickness increases from 50 to 100 m, the seismic intensity may escalate by 3-4 degrees, and the peak acceleration may amplify by 1.5-2.2 times. With the augmentation of loess deposit thickness and the proliferation of soil layers, both the peak acceleration response spectrum and the characteristic period demonstrate an upward tendency, exhibiting slight fluctuations contingent upon the seismic wave type. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.eqs.2025.11.006
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 32
    Subjects:
      – SubjectFull: Ground motion
        Type: general
      – SubjectFull: Earthquake hazard analysis
        Type: general
      – SubjectFull: Event stratigraphy
        Type: general
      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Shaking table tests
        Type: general
      – SubjectFull: Physiographic provinces
        Type: general
      – SubjectFull: Sedimentation & deposition
        Type: general
      – SubjectFull: Yellow River (China)
        Type: general
    Titles:
      – TitleFull: Amplification of thickness and stratigraphy of loess deposit on seismic ground motion in the Yellow River Basin.
        Type: main
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            NameFull: Wang, Huijuan
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            NameFull: Zhang, Jinghua
      – PersonEntity:
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            NameFull: Wang, Ping
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          Dates:
            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 16744519
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              Value: 39
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              Value: 1
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            – TitleFull: Earthquake Science
              Type: main
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