EVALUATION OF GROUND MOTION AMPLIFICATION FACTOR CONSIDERING THE SHEAR STRENGTH OF SURFACE GROUND AND THE PEAK VALUE OF EARTHQUAKE MOTION ON THE BASEMENT

Ground motion is the movement of the earth's surface due to explosions or the propagation of seismic waves. In the seismic design process, ground response analysis evaluates the impact of local soil conditions during earthquake shaking. However, it is difficult to determine the dynamic site response of soil deposits in earthquake hazard-prone areas. Structural damage has a great influence on the selection of input ground motion, and in this study, the importance of bedrock motion upon the response of soil is highlighted. The specific site response analysis is assessed through “DEEPSOIl" software with an equivalent linear analysis method. Furthermore, four input motions including Kobe, LomaGilroy, Northridge, and Chi-Chi were selected to obtain normalized response spectra. This study aims to obtain the site amplification of ground motion, peak spectral acceleration (PSA), and maximum peak ground acceleration (PGA) based on shear wave velocity from the detailed site-specific analysis of Bangabandhu Sheikh Mujibor Rahman hall at Khulna University of Engineering & Technology. The maximum shear wave velocity obtained was 205 m/s while the amplification factor varied from 4.01 (Kobe) to 1.8 (Northridge) for rigid bedrock properties. Furthermore, the Kobe earthquake produced the highest (4.3g) PSA and the Northridge earthquake produced the lowest (1.08g) PSA for bedrock, with Vs=205 m/s. The surface PGA values were acquired in the range of 0.254g (Northridge) to 0.722g (Kobe), and the maximum strain values for Kobe earthquakes were in the range of 0.016 to .303. Therefore, the surface acceleration values were very high (>0.12g) for the Kobe earthquake motion.

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Nonlinear ground-motion amplification by sediments during the 1994 Northridge earthquake

Nature ◽

10.1038/37586 ◽

1997 ◽

Vol 390 (6660) ◽

pp. 599-602 ◽

Cited By ~ 110

Author(s):

Edward H. Field ◽

Paul A. Johnson ◽

Igor A. Beresnev ◽

Yuehua Zeng

Keyword(s):

Ground Motion ◽

Northridge Earthquake ◽

Ground Motion Amplification ◽

1994 Northridge Earthquake

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Ground-motion amplification at the Colle di Roio ridge, central Italy: a combined effect of stratigraphy and topography

Geophysical Journal International ◽

10.1093/gji/ggw120 ◽

2016 ◽

Vol 206 (1) ◽

pp. 1-18 ◽

Cited By ~ 20

Author(s):

S. Hailemikael ◽

L. Lenti ◽

S. Martino ◽

A. Paciello ◽

D. Rossi ◽

...

Keyword(s):

Ground Motion ◽

Central Italy ◽

Combined Effect ◽

Ground Motion Amplification

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Geophysical and geotechnical factors in urban planing: Bursa (Nilüfer, Osmangazi, and Yildirim) cases

10.5194/nhess-2020-301 ◽

2020 ◽

Author(s):

Ferhat Özçep ◽

Guldane Boyraz ◽

Okan Tezel ◽

Hakan Alp ◽

Nuray Alpaslan ◽

...

Keyword(s):

Ground Motion ◽

Hazard Analysis ◽

Earthquake Hazard ◽

Cyclic Stress ◽

Soil Liquefaction ◽

Wave Velocities ◽

Shear Wave Velocities ◽

Earthquake Motion ◽

Potential Index ◽

Earthquake Hazard Analysis

Abstract. The study area covers the Central of Bursa, Osmangazi, Yildirim, Gürsü, Kestel and Nilüfer District boundaries in Bursa. The seismic process deals with the occurrence of an earthquake event and the process of wave propagation from the source to the site. Local amplification caused by surficial soft soils is a significant factor in destructive earthquake motion. In the first phase of this study, it is investigated the ground motion level and soil amplifications for Bursa city. For his aim, probabilistic and deterministic earthquake hazard analysis (including acceleration estimations) will be carried out for the region. Local amplification caused by surficial soft soils is a significant factor in destructive earthquake motion. In the first phase of this study, it is investigated the ground motion level and soil acharacterization for the region. For his aim, probabilistic earthquake hazard analysis (including acceleration estimations) was carried out for the region. Then, soil shear wave velocities were estimated from data obtained by MASW measurements. Soil liquefaction is a natural event in which the strength and stiffness of a soil are reduced by earthquake vibrations or other dynamic loadings. As it is known, liquefaction occurs in saturated soils, that is, soils in which the space between individual particles is completely filled with water. One of liquefaction evaluation methods is based on the cyclic stress approach. In this method, a safety factor is defined as CRR/CSR. CRR is a cyclic resistance ratio that represents soil liquefaction susceptibility, and CSR is the cyclic stress ratio that represents the earthquake effect. In the second phase of this study, possible soil potential index (PL) and ground induced settlements were estimated by using Isihara ve Yoshimine (1990) approach. All results on liquefaction potential index (Pl), liquefaction induced settlements and soil shear wave velocities in Bursa (Turkey) City were compared with each other. Finally, a seismic microzonation map was prepared by the integration of geophysical and geotechnical data for urban planning purposes.

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STOCHASTIC CHARACTERISTIC OF SITE AMPLIFICATION FACTOR AND ITS EFFECT ON EARTHQUAKE GROUND MOTION

Journal of Japan Society of Civil Engineers Ser A1 (Structural Engineering & Earthquake Engineering (SE/EE)) ◽

10.2208/jscejseee.75.i_763 ◽

2019 ◽

Vol 75 (4) ◽

pp. I_763-I_769

Author(s):

Yasuhiro FUKUSHIMA ◽

Takashi NAGAO

Keyword(s):

Ground Motion ◽

Amplification Factor ◽

Site Amplification ◽

Earthquake Ground Motion ◽

Stochastic Characteristic ◽

Site Amplification Factor

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Near-Surface Seismic Studies To Estimate Potential Earthquake Ground Motion Amplification At A Thick Soil Site In The Ottawa River Valley, Canada

10.3997/2214-4609-pdb.192.ssi_6 ◽

2001 ◽

Author(s):

Beatriz Benjumea ◽

Jim A. Hunter ◽

Susan E. Pullan ◽

Robert A. Burns ◽

Ron L. Good

Keyword(s):

Ground Motion ◽

River Valley ◽

Earthquake Ground Motion ◽

Near Surface ◽

Ground Motion Amplification ◽

Ottawa River ◽

Soil Site

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Physical stratigraphy and geotechnical properties controlling the local seismic response in explosive volcanic settings: the Stracciacappa maar (central Italy)

Bulletin of Engineering Geology and the Environment ◽

10.1007/s10064-020-01925-5 ◽

2020 ◽

Vol 80 (1) ◽

pp. 179-199

Author(s):

M. Moscatelli ◽

G. Vignaroli ◽

A. Pagliaroli ◽

R. Razzano ◽

A. Avalle ◽

...

Keyword(s):

Seismic Response ◽

Ground Motion ◽

Central Italy ◽

Volcanic Event ◽

Ground Motion Amplification ◽

Local Seismic Response ◽

Single Station ◽

Seismic Scenarios ◽

Physical Stratigraphy ◽

Subsoil Model

AbstractNowadays, policies addressed to prevention and mitigation of seismic risk need a consolidated methodology finalised to the assessment of local seismic response in explosive volcanic settings. The quantitative reconstruction of the subsoil model provides a key instrument to understand how the geometry and the internal architecture of outcropping and buried geological units have influence on the propagation of seismic waves. On this regard, we present a multidisciplinary approach in the test area of the Stracciacappa maar (Sabatini Volcanic District, central Italy), with the aim to reconstruct its physical stratigraphy and to discuss how subsoil heterogeneities control the 1D and 2D local seismic response in such a volcanic setting. We first introduce a new multidisciplinary dataset, including geological (fieldwork and log from a 45-m-thick continuous coring borehole), geophysical (electrical resistivity tomographies, single station noise measurements, and 2D passive seismic arrays), and geotechnical (simple shear tests performed on undisturbed samples) approaches. Then, we reconstruct the subsoil model for the Stracciacappa maar in terms of vertical setting and distribution of its mechanical lithotypes, which we investigate for 1D and 2D finite element site response analyses through the application of two different seismic scenarios: a volcanic event and a tectonic event. The numerical modelling documents a significant ground motion amplification (in the 1–1.5 Hz range) revealed for both seismic scenarios, with a maximum within the centre of the maar. The ground motion amplification is related to both 1D and 2D phenomena including lithological heterogeneity within the upper part of the maar section and interaction of direct S-waves with Rayleigh waves generated at edges of the most superficial lithotypes. Finally, we use these insights to associate the expected distribution of ground motion amplification with the physical stratigraphy of an explosive volcanic setting, with insights for seismic microzonation studies and local seismic response assessment in populated environments.

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