Site effect assessment using microtremor measurement, equivalent linear method, and artificial neural network (case study: Babol, Iran)

Rezaei, Sadegh; Choobbasti, Asskar Janalizadeh; Kutanaei, Saman Soleimani

doi:10.1007/s12517-013-1201-1

Cited by 37 publications

(6 citation statements)

References 33 publications

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“…Single point microtremor measurements are widely used in geotechnical earthquake engineering to determine the local site predominant period, amplification and microzonation studies [12][13][14][15][16][17][18]. However, in order to determine the shear wave velocity profile from microtremor measurements and estimate the depth of seismic bedrock which can be defined as the media where the bedrock is rigid and its elastic properties remain nearly the same, the microtremors should be recorded continuously and simultaneously at multi-receiver instead of single point measurements [19].…”

Section: Bedrock Depth From Microtremor Measurementsmentioning

confidence: 99%

A Numerical Study on Comparison of 1D and 2D Seismic Responses of a Basin in Turkey

Haşal¹,

İyisan

2014

AJCE

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Abstract:Local site conditions such as seismic bedrock depth, bedrock slope of the edge, geometry and characteristics of soil layers, topographical irregularities, etc. are the most important factors affecting earthquake ground motion in a specific site. The amplitude and frequency content of bedrock motion can be changed by local site effects, and this variation is denoted as an amplification or de-amplification. Among the several factors, basin edge effect plays an important role in the transformation of earthquake waves and increase of the surface motion duration and amplitude. The limited width of the soil layers or the edge geometry at the deep formations cause earthquake wave transformations, thus the amplitude of the surface ground motion may vary depending on its location. For this reason the frequency content of surface ground motion may differ from the calculated surface ground motion by one dimensional dynamic analysis. In this case two dimensional analysis is required. In this study, in order to compare the soil response under different strong ground motion, one and two dimensional dynamic analyses were performed by using the Dinar Basin model in Turkey. The acceleration time histories and absolute acceleration spectra were obtained for pre-selected points on the ground surface. The 2D/1D spectral acceleration ratios were calculated by dividing the absolute acceleration spectra obtained from two dimensional (2D) and one dimensional (1D) dynamic analysis. The variations of the spectral acceleration ratios (2D/1D) with distance from basin edge were evaluated for different period values. The calculated 2D/1D spectral acceleration ratios reached their maximum values at a certain zone (X/D<3) near basin edge for every interested period value. While approaching to center of basin models, especially at the zones after X/D=3 point it can be noticed that 2D/1D spectral acceleration ratios generally converged to 1 regardless of the edge bedrock slope values. The highest average spectral acceleration ratios were calculated when the relevant period values were between T=0.2~0.5 s. They took values varying between 2 and 3 for this period interval. A relationship between the results of 1D and 2D dynamic analyses was established. In addition, the approximate validity range of 1D and 2D dynamic analysis at the basin edges was investigated for the model.

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Section: Bedrock Depth From Microtremor Measurementsmentioning

confidence: 99%

A Numerical Study on Comparison of 1D and 2D Seismic Responses of a Basin in Turkey

Haşal¹,

İyisan

2014

AJCE

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“…Bayat and Pakar [18][19][20] studied the nonlinear vibration response of beams using the Hamiltonian approach and variational approach, and it was demonstrated that two methods were very accurate and effective and therefore may find wide applicability in engineering and other sciences. In recent years, artificial neural networks were also developed for parameter identification and vibration prediction of nonlinear models [21,22]. Most of the above studies improved the machining accuracy by suppressing tool chatter using dampers.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and Stability Analysis of the Machine Hydrostatic Slide with Magnetorheological Damper

Zhang

Gao

et al. 2019

Shock and Vibration

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Tangential dynamic behaviors of the machine hydrostatic slide with a magnetorheological (MR) fluid damper are studied, and the effect of the MR damper to control the vibration of the hydrostatic slide is discussed. The dynamic model of the hydrostatic slide with the MR damper is established, and the tangential vibration equation of linear and nonlinear is derived. The multidimensional incremental harmonic balance method (MIHBM) with discrete Fourier transform (DFT) is derived by which the nonlinear response and stability of the system are studied. The resonance response of the Duffing equation under the combined action of harmonic excitation and constant excitation is obtained. In order to investigate the vibration response of the hydrostatic slide with the MR damper in detail, the bifurcation diagram, phase diagram, and Poincaré map are given. Finally, the dynamic response of the machine hydrostatic slide with the MR damper is discussed, and it is verified that the MR damper can suppress the tangential vibration of the hydrostatic slide effectively and the constant controller can control the chaotic behavior of the system well.

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“…Some well-known examples include the earthquake in Michoacan, Mexico, in 1985, Loma Prieta, California, USA, 1989, Roodbar, Iran, 1990, Chi-Chi, Taiwan, 1999, Bam, Iran, 2003 In general, site effect has introduced the effects of soils layers and underground topography which alter the specification of strong ground motion (Choobbasti et al 2013;Del Gaudio et al 2013). It is well accepted that, besides the earthquake magnitude and fault distance, local geological conditions, known as site effects, can impose significant influences on the earthquake ground motion at a given place (Rezaei et al 2015;Panzera et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Application of the microtremor measurements to a site effect study

Rezaei

Choobbasti

2017

Earthq Sci

Self Cite

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Earthquake has left much life and property damages. The occurrence of such events necessitates the execution of plans for combating the earthquakes. One of the most important methods for combating earthquakes includes assessing dynamic characteristics of soil and site effect. One of the methods by which one can state dynamic characteristics of the soil of an area is the measurement of microtremors. Microtremors are small-scale vibrations that occur in the ground and have an amplitude range of about 0.1-1 microns. Microtremor measurement is fast, applicable, cost-effective. Microtremor measurements were taken at 15 stations in the Babol, north of Iran. Regarding H/V spectral ratio method, peak frequency and amplification factor were calculated for all microtremor stations. According to the analysis, the peak frequency varies from 0.67 to 8.10 Hz within the study area. Also, the authors investigated the validity of the results by comparing them with SESAME guidelines and geotechnical conditions of study area. The microtremor analysis results are consistent with SESAME guidelines and geotechnical condition of study area. The results show that the microtremor observations are acceptable methods for assessing dynamic characteristics of soil and site effect in the Babol City.

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Site effect assessment using microtremor measurement, equivalent linear method, and artificial neural network (case study: Babol, Iran)

Cited by 37 publications

References 33 publications

A Numerical Study on Comparison of 1D and 2D Seismic Responses of a Basin in Turkey

A Numerical Study on Comparison of 1D and 2D Seismic Responses of a Basin in Turkey

Dynamic and Stability Analysis of the Machine Hydrostatic Slide with Magnetorheological Damper

Application of the microtremor measurements to a site effect study

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