Improving the shear wave velocity structure beneath Bucharest (Romania) using ambient vibrations

Manea, Elena Florinela; Michel, Clotaire; Poggi, Valerio; Fäh, Donat; Rădulian, Mircea; Balan, Florin Stefan

doi:10.1093/gji/ggw306

Cited by 21 publications

(31 citation statements)

References 32 publications

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“…The variability of the f 0 in our dataset is between 0.1 and 15 Hz, where the highest one is attributed to the bedrock condition. The f 0 values are inferred from Manea et al (2016Manea et al ( , 2019Manea et al ( , 2020 and Coman et al (2020), where its variability is presented along different tectonic units and areas. The distributions of the within-event residuals with all site parameters (EC8 soil classes and f 0 ) are presented in Figures S2-S10 in the Supplementary Materials (d, e) for PGA, PSA (0.3, 0.7, 1, 3, 5, 7, and 10 s) and PGV and show that no further dependency exists.…”

Section: Site Conditions (Fsite)mentioning

confidence: 99%

“…For comparison purposes, a regular grid, with a resolution of 15 km, encompassing all of Romania was used. The fundamental frequency of resonance requested by the new GMM was extracted at each grid node by interpolating the f 0 at all the seismic stations from permanent network and temporary arrays published by Manea et al (2016Manea et al ( , 2019Manea et al ( , 2020 and Coman et al (2020). In addition, the grid describes the amplification zonation of Setal08.…”

Section: Gmm Evaluation and Comparisonmentioning

confidence: 99%

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Ground-motion models for Vrancea intermediate-depth earthquakes

2021

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A newly compiled high-quality ground-shaking dataset of 207 intermediate-depth earthquakes recorded in the Vrancea region of the south-eastern Carpathian mountains in Romania was used to develop region-specific empirical predictive equations for various intensity measures: peak ground acceleration, peak ground velocity, and 5%-damped pseudo-spectral acceleration up to 10 s. Besides common predictor variables (e.g. moment magnitude, depth, hypocentral distance, and site conditions), additional distance scaling parameters were added to describe the specific attenuation pattern observed at the stations located not only on the back and fore but also along the Carpathian arc. In this model, we introduce a proxy measure for the site as the fundamental frequency of resonance to characterize the site response at each recording seismic station beside the soil classes. To additionally reduce the site-to-site variability, a non-ergodic methodology was considered, resulting in a lower standard deviation of about 25%. Statistical evaluation of the newly proposed ground-motion models indicates robust performance compared to regional observations. The model shows significant improvements in describing the spatial variability (at different spectral ordinates), particularly for the fore-arc area of the Carpathians where a deep sedimentary basin is located. Furthermore, the model presented herein improves estimates of ground shaking at longer spectral ordinates (>1 s) in agreement with the observations. The proposed ground-motion models are valid for hypocentral distances less than 500 km, depths over 70 km and within the moment magnitude range of 4.0–7.4.

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Section: Site Conditions (Fsite)mentioning

confidence: 99%

Section: Gmm Evaluation and Comparisonmentioning

confidence: 99%

Ground-motion models for Vrancea intermediate-depth earthquakes

2021

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“…In the last decades, seismic arrays acquiring data for periods of several weeks to months have been deployed in different cities. We can highlight the pioneering work carried out in Bucharest, where around 30 stations were deployed in the early 2000s to map the dominant sources of noise (Groos and Ritter, 2009) and investigate the uppermost shear wave velocity structure (Manea et al, 2016). A particular case is the deployment of 5200 sensors spaced 100 m away in the city of Long Beach (California, United States).…”

Section: Characterization Of the Sources Of Background Vibrations In mentioning

confidence: 99%

Seismometers Within Cities: A Tool to Connect Earth Sciences and Society

et al. 2020

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The high degree of human activities in urban environments produces large background vibrations that makes it difficult to use data acquired in these areas for classical seismology. Seismometers installed within cities have been typically been used for the study of seismic hazard or for monitoring civil engineering problems. However, with the development of monitoring techniques based on the interpretation of the so-called seismic ambient noise, these data have gained scientific interest. Our objective is to discuss an additional utility of seismometers deployed within a city; its use as a tool to connect society with Earth sciences. Many citizen activities, from traffic to music concerts, produce vibrations that can be recorded seismically, and our experience shows that these records attract the attention of the media and social networks. With the emergence of low-cost and easy-to-use instruments in recent years, more citizens can now record ground motion and become interested in the interpretation of the recorded seismograms. The installation of permanent seismic networks in educational centers has proven to be a good approach to introduce students to Earth sciences at the national level and can also be developed at the urban scale using this new instrumentation. In this contribution we will first review the previous results related to the identification of the sources of vibration in urban areas and then present a new ongoing project based on the deployment of a seismic network in educational centers located in the city of Barcelona.

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“… 2 . Earth shaking from traffic and railways has been used to extract shear waves and construct stacked seismic images or to invert surface wave travel times 3 – 5 . Seismic sensors have been proposed as an efficient way to detect and characterize moving vehicles on roadways 6 .…”

Section: Introductionmentioning

confidence: 99%

Urban Seismology: on the origin of earth vibrations within a city

Díaz

Ruiz

Sánchez‐Pastor

et al. 2017

Sci Rep

105

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Urban seismology has become an active research field in the recent years, both with seismological objectives, as obtaining better microzonation maps in highly populated areas, and with engineering objectives, as the monitoring of traffic or the surveying of historical buildings. We analyze here the seismic records obtained by a broad-band seismic station installed in the ICTJA-CSIC institute, located near the center of Barcelona city. Although this station was installed to introduce visitors to earth science during science fairs and other dissemination events, the analysis of the data has allowed to infer results of interest for the scientific community. The main results include the evidence that urban seismometers can be used as a easy-to-use, robust monitoring tool for road traffic and subway activity inside the city. Seismic signals generated by different cultural activities, including rock concerts, fireworks or football games, can be detected and discriminated from its seismic properties. Beside the interest to understand the propagation of seismic waves generated by those rather particular sources, those earth shaking records provide a powerful tool to gain visibility in the mass media and hence have the opportunity to present earth sciences to a wider audience.

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Improving the shear wave velocity structure beneath Bucharest (Romania) using ambient vibrations

Cited by 21 publications

References 32 publications

Ground-motion models for Vrancea intermediate-depth earthquakes

Ground-motion models for Vrancea intermediate-depth earthquakes

Seismometers Within Cities: A Tool to Connect Earth Sciences and Society

Urban Seismology: on the origin of earth vibrations within a city

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