Seismic Microzonation and Damage Assessment of Bam City, Southeastern Iran

Motamed, Ramin; Ghalandarzadeh, Abbas; Tawhata, Ikuo; Tabatabaei, S. H.

doi:10.1080/13632460601123164

Cited by 47 publications

(18 citation statements)

References 12 publications

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“…4. The same comparison was made for Bam city in southern Iran by Motamed et al (2007) who obtained a good accord between characteristic acceleration data from the 2003 Bam earthquake and predominant frequency of microtremor analysis. Indeed, it is concluded that microtremor measurement can be used as a fast, cheap and a preliminary tool for microzonation of cities, which is one of the fundamental steps in seismic hazard assessment.…”

Section: Discussionmentioning

confidence: 76%

Assessment of potential seismic hazard and site effect in Antakya (Hatay Province), SE Turkey

et al. 2010

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Antakya city is at risk because of strong earthquakes occurring in the area, and different soil conditions that can produce variation of the ground motion amplification. Microzonation of cities provides a basis for site-specific hazard analysis in urban settlements. In particular, seismic microzonation can be provided by means of detailed seismic assessment of the area, including earthquake recordings and geological studies. In this paper, we propose a preliminary microzonation map for the city of Antakya, based on the variation of the dominant periods and shear velocities of the sediments covering the area. The periods are retrieved from microtremor measurements conducted at 69 sites, using the horizontal-to-vertical spectral ratio technique. The results of microtremor analysis were compared with data obtained from refraction microtremor (ReMi) measurements at four profiles crossing the studied area. According to the classification of dominant periods, Antakya city can be divided into five zones, probably prone to different levels of seismic hazard. The shorter natural periods are in inner Antakya and both the sides of Asi River (i.e., northern and southern parts). The eastern and western parts of Antakya have maximum dominant periods. The V s 30 values were calculated by using the ReMi method along the profiles. Antakya city has V s 30 values in the range of category C of the national earthquake hazard reduction programme site classification.

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Section: Discussionmentioning

confidence: 76%

Assessment of potential seismic hazard and site effect in Antakya (Hatay Province), SE Turkey

et al. 2010

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“…Completely weathered limestone Wohlenberg 1999; Delgado et al 2000;Parolai et al 2002;Motamed et al 2007;Abdel-Rahman et al 2012). Of particular, Ibs-von Seht and Wohlenberg (1999) stated that the resonance frequency (f r ) of a soil layer is closely related to its thickness (h) as follows:…”

Section: Sediment Thickness and Resonance Frequency Relationshipmentioning

confidence: 96%

Evaluation of site response characteristics of King Abdulaziz City for Science and Technology, Saudi Arabia using microtremors and geotechnical data

et al. 2014

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Microtremor measurements become one of the widely accepted tools to evaluate the site response characteristics since the last two decades. These measurements have been conducted at four sites inside King Abdulaziz City for Science and Technology (KACST), Riyadh city, Saudi Arabia to estimate the resonance frequency and the associated amplitude of sediments. Microtremor measurements have been recorded for 24 h with a sampling frequency of 100 Hz in the range from 0.2 to 25 Hz band-pass filter. Origin of the identified peaks has been tested. The estimated peaks are correlated with borehole geotechnical data: (1) the first peak with an average frequency of 8.25 Hz that reflects the impedance contrast between the uppermost surface soil and the underlying completely weathered limestone and (2) the second peak of 1.43 Hz which corresponds to the impedance contrast between the completely weathered limestone and the underlying limestone rocks. In addition, the relation between sediment thickness and resonance frequency has been assessed. Based on the results of this study, it can be stated that microtremor measurements are capable to estimate thickness of sedimentary overburden. These results will support for seismic safety in case of civil engineering constructs in KACST area.

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“…Several studies show the relationship between the velocity structure beneath the recording site and the fundamental frequency obtained from HVSR (horizontal-to-vertical spectral ratios of microtremors) analysis (Ibs-von Seht and Wohlenberg, 1999;Parolai et al, 2002;Motamed et al, 2007). We used the sedimentary layer parameters obtained by Al-Haddad et al (submitted for publication) through shear-wave velocity profiles, where a sample of ten boreholes have been drilled through the study area.…”

Section: Figure 5 (Continued)mentioning

confidence: 99%

Microtremor measurements in Yanbu city of Western Saudi Arabia: A tool for seismic microzonation

Fnais

Abdelrahman

Alamri

2010

Journal of King Saud University - Science

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Microtremor measurements are one of the most popular world-wide tool for estimation of site response especially within the urban area. This technique has been applied over 85 sites distributed regularly through Yanbu metropolitan area with an ultimate aim of seismic hazard microzonation for ground-shaking site effects. The horizontal to vertical spectral analysis (H/V) was carried out over all the sites to estimate both the fundamental resonance frequency and its corresponding amplification for the ground vibration. In most sites, H/V curve for amplitude spectra display a clear peak suggesting the presence of a soil-bedrock impedance contrast. Other sites, however, show more than one peak indicating the presence of more than one impedance contrast through sedimentary cover. The estimated values of fundamental frequency range from 0.25 Hz up to 7.9 Hz increases with decreasing depths of basement rock. It has lower values at the central zone extending from north to south compared to the eastern and western parts of Yanbu area. On the other hand, the estimated values of amplification factor ranges from the value of 2 to 5, where the higher values prevailing through the central zone with increasing thickness of sediments. Analyses of the acquired data set have clearly shown that, both of two parameters vary considerably through Yanbu city. This could be due to lateral variations in soil thickness and/or variations in the soil type at Yanbu area. These results show the 2D and 3D effect of basin geometry. The estimated values for the fundamental frequency from microtremor data are compared with that from shear-wave velocity structure within the area of interest and show an excellent agreement.

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Seismic Microzonation and Damage Assessment of Bam City, Southeastern Iran

Abstract: This article aims to study the dynamic characteristics of soil in

Cited by 47 publications

References 12 publications

Assessment of potential seismic hazard and site effect in Antakya (Hatay Province), SE Turkey

Assessment of potential seismic hazard and site effect in Antakya (Hatay Province), SE Turkey

Evaluation of site response characteristics of King Abdulaziz City for Science and Technology, Saudi Arabia using microtremors and geotechnical data

Microtremor measurements in Yanbu city of Western Saudi Arabia: A tool for seismic microzonation

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