Effect of Local Geology on Ground Motion in the City of Palermo, Italy, as Inferred from Aftershocks of the 6 September 2002 Mw 5.9 Earthquake

Giulio, Giuseppe Di; Azzara, R. M.; Cultrera, Giovanna; Giammarinaro, Maria Stella; Vallone, Paola; Rovelli, A.

doi:10.1785/0120040219

Cited by 25 publications

(11 citation statements)

References 28 publications

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“…They are covered by residual soil, with depth ranging from 10 to 60 m. The JF consists of sedimentary rocks of Upper Triassic and lower to middle Jurassic age. The observed vibration properties of structures integrate all the complexity of these structures including the load bearing system, heavy and stiff nonstructural elements, weather [17], and also soil-structure interaction [18][19][20]. The OA consists of loose sand and fine gravel with silt and clay lenses.…”

Section: Singapore Geologymentioning

confidence: 90%

“…Thus, the results of the ratio between the horizontal and vertical spectral will eventually have the effects of attenuation and source eliminated. Di Giulio et al [20] performed measurements on the top, at the base, and half building height away from the buildings at the southern Tyrrhenian Sea, 40 km off the coast of Palermo. Castro et al [22] used the method to estimate the characteristic frequency of vibration of two dams located in Southern Italy, using spectral amplitude of 13 local earthquakes recorded by three-component digital stations installed on top of the dams and on the free field.…”

Section: Data Processingmentioning

confidence: 99%

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Empirical relationships between natural vibration period and height of buildings in Singapore

Pan

Goh

Megawati

2013

Earthq Engng Struct Dyn

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SUMMARY Singapore is a classic case of a modern metropolis with low hazard but high exposure to the seismicity in Sumatra. Because of land shortage, more than 80% of the population lives in high‐rise residential buildings. As part of the efforts to assess the seismic performance of buildings in Singapore subjected to long‐distance Sumatran earthquakes, relationships between the natural vibration period and height of high‐rise public residential buildings in Singapore are derived empirically by conducting ambient vibration tests on 116 buildings. The measured buildings have a height ranging from 4 to 30 stories. The aspect ratio of buildings in plan is found to be insignificant in affecting the natural vibration period of the first mode of the buildings. The period‐height relationships are derived using regression analysis considering the site properties of a building. It is concluded that the vibration periods estimated from the proposed period‐height relationship for buildings located at soft‐soil site are about 40% longer than the vibration periods estimated for buildings located at firm‐soil site. Measurements are also conducted to study the influence of buildings on the measured frequency of the surrounding soil. For this purpose, two buildings with 25 and 30 stories located at firm‐soil site and soft‐soil site, respectively, are selected. It is found that the distance of building influence on the measured frequency of the surrounding soil may reach up to one building height for a firm‐soil site and two building heights for a soft‐soil site. Additional data of natural vibration periods of 19 instrumented residential buildings, which have height ranging from 9 to 30 stories, were obtained from the building response recorded during the September 30, 2009 Sumatran earthquake event. The natural vibration periods of these buildings are compared with those estimated using the proposed period‐height relationships, and the absolute differences are found to be less than 12%. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Singapore Geologymentioning

confidence: 90%

Section: Data Processingmentioning

confidence: 99%

Empirical relationships between natural vibration period and height of buildings in Singapore

Pan

Goh

Megawati

2013

Earthq Engng Struct Dyn

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“…In fact, several studies have evidenced structure-soil interaction, which may perturb H/V studies (e.g. Guéguen 2000; Chavez-Garcia and Cardenas-Soto 2002; Gallipoli et al 2004;Dunand 2005;Cornou et al 2005;Di Giulio et al 2005). However, unlike influence from other experimental conditions it is a real interaction and other peak frequencies may appear on the H/V curves due to structure-soil interaction.…”

Section: P4-conclusionmentioning

confidence: 99%

Evaluation of the influence of experimental conditions on H/V results from ambient noise recordings

Chatelain

Guillier

Cara

et al. 2007

Bull Earthquake Eng

126

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International audienceThe H/V-noise technique is now widely used to estimate site effect parameters (fundamental frequency and sometimes the associated soil amplification), and many surveys using this technique have provided convincing results. However, a general agreement on a methodology for data acquisition, data processing and result interpretation has yet to be found. H/V measurements from ambient noise recordings imply both reliability of the results and rapidity of data collection. It is therefore important to understand which experimental conditions (1) influence data quality and reliability, and (2) can help speeding up the recording process. Within the framework of the SESAME European project, a specific task was defined to investigate the reliability of the H/V spectral ratio technique in assessing the site effects. The aim of WP02, one specific Work Package of the SESAME project, is to study the effects of experimental conditions on both stability and reproducibility of H/V results. This study has been conducted in a purely experimental way, by testing the possible influence of various experimental conditions on H/V results both on the frequency peak value and on its amplitude. WP02 results help setting up the experimental conditions under which ambient noise recordings have to be performed in order to provide reproducible, reliable and meaningful H/V results. In this paper we present the results of the WP02 SESAME project concerning the evaluation of the influence of experimental conditions of ambient noise recording on H/V results

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“…This paper presents results for building periods and damping for 80 full-scale buildings in Italy, measured from ambient vibration data using different estimation techniques. To compare the results obtained with microtremor measurements with those of earthquakes, we used four different techniques: horizontal-to-vertical spectral ratio (HVSR [14][15][16]), standard spectral ratio (SSR [17]), non-parametric damping analysis (NonPaDAn [18]) and half bandwidth method (HBW [19]). The simple inspection of FFT transform at a single point could be misleading: fixed-frequency anthropic noise could propagate inside small buildings and can be considered as a structural mode.…”

Section: Introductionmentioning

confidence: 99%

Empirical estimate of fundamental frequencies and damping for Italian buildings

Gallipoli

Mucciarelli

Vona

2008

Earthq Engng Struct Dyn

109

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SUMMARYThe aim of this work is to estimate the fundamental translational frequencies and relative damping of a large number of existing buildings, performing ambient vibration measurements. The first part of the work is devoted to the comparison of the results obtained with microtremor measurements with those obtained from earthquake recordings using four different techniques: horizontal-to-vertical spectral ratio, standard spectral ratio, non-parametric damping analysis (NonPaDAn) and half bandwidth method. We recorded local earthquakes on a five floors reinforced concrete building with a pair of accelerometers located on the ground and on top floor, and then collected microtremors at the same location of the accelerometers. The agreement between the results obtained with microtremors and earthquakes has encouraged extending ambient noise measurements to a large number of buildings. We analysed the data with the abovementioned methods to obtain the two main translational frequencies in orthogonal directions and their relative damping for 80 buildings in the urban areas of Potenza and Senigallia (Italy). The frequencies determined with different techniques are in good agreement. We do not have the same satisfactory results for the estimates of damping: the NonPaDAn provides estimates that are less dispersed and grouped around values that appear to be more realistic. Finally, we have compared the measured frequencies with other experimental results and theoretical models. Our results confirm, as reported by previous authors, that the theoretical period-height relationships overestimate the experimental data.

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Effect of Local Geology on Ground Motion in the City of Palermo, Italy, as Inferred from Aftershocks of the 6 September 2002 Mw 5.9 Earthquake

Cited by 25 publications

References 28 publications

Empirical relationships between natural vibration period and height of buildings in Singapore

Empirical relationships between natural vibration period and height of buildings in Singapore

Evaluation of the influence of experimental conditions on H/V results from ambient noise recordings

Empirical estimate of fundamental frequencies and damping for Italian buildings

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