Ambient noise horizontal-to-vertical spectral ratio in site effects estimation and correlation with seismic damage distribution in urban environment: the case of the city of Thessaloniki (Northern Greece)

Panou, Areti; Theodulidis, N.; Hatzidimitriou, P. M.; Stylianidis, K.; Papazachos, C. B.

doi:10.1016/j.soildyn.2005.02.004

Cited by 92 publications

(54 citation statements)

References 68 publications

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“…It is widely used in microzonation studies, providing accurate characterization models. In Greece, the HVSR technique has been frequently used, providing consistent results (Panou et al, 2005;Kassaras et al, 2014, among others).…”

Section: Seismic Hazard Assessmentmentioning

confidence: 71%

Seismic Damage Scenarios in Kalamata (S. Greece)

Kazantzidou-Firtinidou

Kassaras

Ganas

et al. 2017

geosociety

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Section: Seismic Hazard Assessmentmentioning

confidence: 71%

Seismic Damage Scenarios in Kalamata (S. Greece)

Kazantzidou-Firtinidou

Kassaras

Ganas

et al. 2017

geosociety

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“…Damage enhancement and soil-structure resonance were recently studied using microtremors for the Umbria-Marche earthquake (Mucciarelli and Monachesi, 1998;Natale and Nunziata, 2004), the Thessaloniki earthquake (Panou et al, 2005), the Molise earthquake (Gallipoli et al, 2004b), the Krn Mountain earthquakes in the Bovec basin (Gosar, 2007), the Ilirska Bistrica area (Gosar and Martinec, 2009), and the Ljubljana basin .…”

Section: Methodsmentioning

confidence: 99%

Site effects and soil-structure resonance study in the Kobarid basin (NW Slovenia) using microtremors

Gosar

2010

Nat. Hazards Earth Syst. Sci.

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Abstract. The town of Kobarid is located in one of three areas with the highest seismic hazard in Slovenia. It was hit by several [1976][1977] Friuli sequence earthquakes and recently by the 1998 and 2004 Krn Mountains earthquakes which caused damage of intensity up to VII EMS-98 scale. The town is located in a small basin filled with heterogeneous glaciofluvial Quaternary sediments in which site effects due to soft sediments are expected. The existing microzonation which is based on surface geological data only is inadequate, and no borehole or geophysical data are available in the basin that would allow a modelling approach of site effects assessment. The microtremor horizontal-to-vertical spectral ratio (HVSR) method was therefore applied in order to assess the fundamental frequency of the sediments. Investigations were performed on a 100×100 m dense grid and 106 free-field measurements acquired. Clear HVSR peaks were obtained in the majority of the surveyed area. The eastern part of the basin is characterized by two well separated peaks which indicate distinct shallow and deep impedance contrasts. The iso-frequency map of sediments shows a distribution in a broad range of 1.8-22.2 Hz. The observed frequencies can be related to the total thickness of Quaternary sediments (sand, gravel) in the western part of the basin only. They are deposited over bedrock built of Cretaceous flysch. In the eastern part the obtained fundamental frequencies are influenced by the presence of a shallow conglomerate layer inside sandy gravel or lacustrine chalk. The extent of these layers was not known before. Microtremor measurements were also performed inside 19 characteristic buildings of various heights (from two to four stories), and longitudinal and Correspondence to: A. Gosar (andrej.gosar@gov.si) transverse fundamental frequencies determined from amplitude spectra. A potential of soil-structure resonance was assessed by comparing building frequencies with the free-field sediments frequencies derived from the iso-frequency map. For two surveyed buildings a high danger of soil-structure resonance was assessed and for three buildings the danger was of medium level. The building resonant frequency of two-and three-story houses, which prevail in the area, spans the range 4-11 Hz, with an average value of 7.7 Hz. The danger of soil-structure resonance should be therefore sought in this frequency range. Since the majority of Kobarid area is characterized by lower (W part) or higher (E part) frequencies, the danger exist mainly in a relatively narrow transition zone.

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“…2) and our field observation regarding thickness of loss sediment in the investigated sites. Many previous studies (e.g., Mukhopadhyay and Bormann, 2004;SESAME project, 2004;Panou et al, 2005;Hagshenas et al, 2008;Zandieh and Pezeshk, 2011) showed that the H/V method is very effective in determining the site fundamental frequency; however measurements and analysis should be performed with caution. The estimation of amplification of ground motion at resonance frequency using H/V spectral ratios method is still controversial.…”

Section: Ambient Noise For Determination Of Site Dynamic Properties Amentioning

confidence: 99%

Ambient noise for determination of site dynamic properties at Hurghada and Safaga cities, Red Sea, Egypt

Toni¹

2016

Acta Geodynamica Et Geomaterialia

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Recording ambient noise at the surface is increasingly used for the assessment of site response and has become a fundamental task for seismic risk reduction in urbanized areas. Methods based on the measurement of seismic noise, which typically are fast, non invasive, and low cost, have become a very attractive option in microzonation studies. In the current work, we use the ambient noise recordings collected by single seismic stations and two-dimensional arrays to determine the response of the near-surface soil at the two touristic cities of Hurghada and Safaga which are located at the Red Sea coast in Egypt. Based on the horizontal-to-vertical (H/V) spectral ratio Nakamura's technique, recordings of the single stations are analyzed to estimate the fundamental site frequency (f 0 ). Using the raw noise signals recorded by two arrays, we present a joint inversion scheme for surface wave dispersion curves. In particular, the Rayleigh wave dispersion curves and the H/V curves are combined in a joint inversion procedure. We present inversion procedure based on the computation of high-frequency correlation functions between arrays' stations. The calculation of Rayleigh wave phase velocities is based on the frequency-domain SPatial AutoCorrelation (SPAC) and frequency-wavenumber (f-k) methods. Constitutively, a tomographic inversion of the travel-times estimated for each frequency is performed, allowing the vertically varying 1-D shear wave velocity structure below the array to be retrieved. Following the relationship between resonance frequency (f 0 ) and thickness of sediments, the thickness of unconsolidated sediments at the investigated sites are determined. ARTICLE INFO

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Ambient noise horizontal-to-vertical spectral ratio in site effects estimation and correlation with seismic damage distribution in urban environment: the case of the city of Thessaloniki (Northern Greece)

Cited by 92 publications

References 68 publications

Seismic Damage Scenarios in Kalamata (S. Greece)

Seismic Damage Scenarios in Kalamata (S. Greece)

Site effects and soil-structure resonance study in the Kobarid basin (NW Slovenia) using microtremors

Ambient noise for determination of site dynamic properties at Hurghada and Safaga cities, Red Sea, Egypt

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