Deterministic Approach for the Seismic Microzonation of Bucharest

Cioflan, Carmen Ortanza; Apostol, Bogdan Felix; Moldoveanu, C. L.; Panza, G. F.; Marmureanu, Gheorghe

doi:10.1007/978-3-0348-7355-0_12

Cited by 7 publications

(7 citation statements)

References 15 publications

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“…5;SANDI et al, 2004b), are given in Table 9. The data on propagation velocities adopted are fairly compatible with the homologous data specified in CIOFLAN et al (2004) or in ALDEA et al (2007.…”

Section: Transfer Functions Of Sequences Of Upper Geological Layerssupporting

confidence: 78%

A Summary of Instrumental Data on the Recent Strong Vrancea Earthquakes, and Implications for Seismic Hazard

Sandi

Borcia²

2010

Pure Appl. Geophys.

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The paper is intended to summarize the most important instrumental data of direct relevance for engineering activities, obtained in connection with the strong Vrancea earthquakes of and to point out some significant consequences and conclusions derived on this basis. Two main objectives of this analysis may be emphasized: (a) in-depth analysis of the radiation pattern; and (b) analysis of the spectral contents of ground motion in connection with the features of local conditions, and with the intention of assessing the relative importance of two main factors: source mechanism and long-distance wave propagation, versus features of local geological conditions. Some specific methodological developments used in this context may be mentioned: (a) use of a new approach to the quantification of ground motion intensity on the basis of instrumental (accelerographic) information; (b) analysis of radiation pattern in spectral and directivity terms; (c) parametric analysis of site-specific transfer functions for the local sequences of geological layers; and (d) a critical view on the outcome of postearthquake survey techniques, keeping in view the implications of the spectral features of ground motion. The main results obtained are related to: (a) ground motion radiation features that have to be taken into account in connection with the data on the source mechanisms of the successive events dealt with; (b) expected spectral features of future strong ground motion at different sites; (c) methodological developments proposed for the assessment of local transfer functions; and (d) implications for microzonation activities.

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Section: Transfer Functions Of Sequences Of Upper Geological Layerssupporting

confidence: 78%

A Summary of Instrumental Data on the Recent Strong Vrancea Earthquakes, and Implications for Seismic Hazard

Sandi

Borcia²

2010

Pure Appl. Geophys.

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“…30 × 70 km 2 , depth range 80-200 km). Four such events with magnitudes larger than 6.5 took place during the last century, and the two earthquakes on November 10 th , 1940 (M W =7.7) and March 4 th , 1977 (M W =7.4) led to disastrous consequences, with more than 1500 fatalities on Romanian territory during the latter one (Cioflan et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Source Spectra and Site Response from S Waves of Intermediate-Depth Vrancea, Romania, Earthquakes

Oth¹,

Parolai²,

Bindi³

et al. 2009

Bulletin of the Seismological Society of America

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Seismograms from 55 intermediate-depth Vrancea earthquakes (M=4.0-7.1) recorded at 43 stations of an accelerometric network in Romania are used to derive source spectra and site amplification functions from S-waves in the frequency range 0.5-20 Hz with the generalized inversion technique (GIT) (Castro et al., 1990). Attenuation is taken into account using the nonparametric attenuation functions derived by Oth et al. (2008) from the same dataset, and the attenuation-corrected data are then split into source and site contributions. The source spectra follow the ω-2-model (Brune, 1970, 1971) with high corner frequencies and a related Brune stress drop of the order of 100 MPa. The site amplification functions are determined for both horizontal and vertical components separately. Contrary to widespread expectation the vertical component shows significant amplification effects at high frequencies.

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“…The NDSHA hybrid procedure used for ground-motion modelling is capable of synthesising seismic ground motion from basic understanding of fault mechanism and seismic wave propagation. The capability of the procedure has already been proved, in the framework of UNESCO-IUGS-IGCP project 414, in several major cities in different regions: Bucharest CIOFLAN et al, 2004), Thessaloniki (TRIANTAFYLLIDIS et al, 1998), Zagreb (LOKMER et al, 2002, Rome and Naples, Italy (FÄ H et al, 1995a;VACCARI et al, 1995), Mexico City (FÄ H et al, 1995b), Beijing (SUN et al, 1998;DING et al, 2004a, b). Despite the difficult verification of the synthetic strong motion database obtained, because of the lack of strong motion records in Sofia, some encouraging validation regarding the macroseismic intensity variation (SLAVOV et al, 2004) and the seismic regulation prescriptions have been performed.…”

Section: Seismic Hazard Assessment (Sha) and Seismic Microzonation Stmentioning

confidence: 99%

Some Contributions of the Neo-Deterministic Seismic Hazard Assessment Approach to Earthquake Risk Assessment for the City of Sofia

Paskaleva¹,

Kouteva-Guentcheva²,

Vaccari

et al. 2010

Pure Appl. Geophys.

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This paper describes the outcome of the advanced seismic hazard and seismic risk estimates recently performed for the city of Sofia, based on the state-of-the-art of knowledge for this site. Some major results of the neo-deterministic, scenario-based, seismic hazard assessment approach (NDSHA) to the earthquake hazard assessment for the city of Sofia are considered. Further validations of the recently constructed synthetic strong motion database, containing site and seismic source-specific ground motion time histories are performed and discussed. Displacement and acceleration response spectra are considered. The elastic displacement response spectra and displacement demand are discussed with regard to earthquake magnitude, seismic source-to-site distance, seismic source mechanism, and local geological site conditions. The elastic response design spectrum from the standard pseudo-acceleration, versus natural period, T n , format, converted to a capacity diagram in S a -S d format is discussed in the perspective of the Eurocode 8 provisions. A brief overview of the engineering applications of the seismic demand obtained making use of the NDSHA is supplied. Some applications of the outcome of NDSHA procedure for engineering purposes are shown. The obtained database of ground shaking waveforms and time-histories, computed for city of Sofia is used to: (1) extract maximum particle velocities; (2) calculate the space distribution of the horizontal strain factor Log 10 e; (3) estimate liquefaction susceptibility in terms of standard penetration test, N values, and initial over burden stress; (4) estimate damage index distribution; and (5) map the distribution of the expected pipe breaks and red-tagged buildings for given scenario earthquakes, etc. The theoretically obtained database, based on the simultaneous treatment of the data from many disciplines, contains data fully suitable for practical use. The proper use of this database can lead to a significant seismic vulnerability reduction and thus contributes to earthquake preparedness.

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Deterministic Approach for the Seismic Microzonation of Bucharest

Cited by 7 publications

References 15 publications

A Summary of Instrumental Data on the Recent Strong Vrancea Earthquakes, and Implications for Seismic Hazard

A Summary of Instrumental Data on the Recent Strong Vrancea Earthquakes, and Implications for Seismic Hazard

Source Spectra and Site Response from S Waves of Intermediate-Depth Vrancea, Romania, Earthquakes

Some Contributions of the Neo-Deterministic Seismic Hazard Assessment Approach to Earthquake Risk Assessment for the City of Sofia

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