Peer-reviewed articles 17,970 +


Drago? Tataru; Ciugudean – Toma Viorica; Dragos Toma-Danila
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
In the past decades, the necessity for detailed earthquake microzonation studies was recognized for Bucharest city first because significant damage occurred here during the last major earthquakes, as well as for other densely populated cities in Romania exposed to major seismic risk due to the intermediate-depth earthquakes occurring in Vrancea zone and local site effects. Numerous studies established different approaches incorporating non-linearity analyses, which generally did not consider groundwater level changes. For this purpose, notably, numerical models are most suitable.
These models require a good knowledge of the local geological conditions (especially of the uppermost unconsolidated units), information about the geotechnical parameters of these units, and a hydrogeological model of the investigated area. These models required first the construction of a robust database which should contain all the information about geological strata in the area down to at least 100 m depth or more. The database should include geology or geometric data of the layers and other geophysical and geotechnical related details like the characteristic density and average seismic velocity for each layer, as well as the water table variation in the area. All of them have proved to be important in a scientific assessment of the local seismic hazard according to the modern procedures able to have an output in the city's local seismic hazard (microzonation).
Most of this information can be obtained from geotechnical investigations and surveys that have already been carried out in the most densely populated areas. In the last 25 years, a lot of valuable information has been gathered by different research institutes, and only part of them was made available through publication. Other parts of the dataset will be acquired beginning now, according to new methods designed not to disturb the daily activity in the city and to respect the green spaces and general environment.
The present study aims to establish a numeric database, organized from all this information in a GIS environment, capable of giving an appropriate image of the Bucharest surface and shallow geologic layers until 100 – 150 m depth. Due to the rapid changing of physical properties on the surface and in-depth, it is required that we have verified values in a grid of 100 m x 100 m and with an error of +/- 1 m depth. The geologic layers database, together with the database of the static and dynamic properties of the sedimentary rocks, that is already accomplished, will serve as valuable input for further studies aiming at a thorough quantification of local seismic hazard in Bucharest city.
[1] Aldea A, Yamanaka H, Negulescu C, Kashima T, Radoi R, Kazama H, Calarasu E (2006) Extensive seismic instrumentation and geophyiscal investigation for site-response studies in Bucharest, Romania. Proceedings of the Third International Symposium on the Effects of Surface geology on Seismic Motion, Grenoble France, 30 Aug. – 1 Sept. 2006, paper 69.
[2] Bala A, Hannich D, Ritter JRR, Ciugudean – Toma V (2011) Geological and Geophysical Model of the Quaternary Layers based on in situ measurements in Bucharest, Romania, Rom Rep in Phys, 63 (1): 250-274
[3] Bala A, Arion C, Aldea A, (2013) In situ borehole measurements and laboratory measurements as primary tools for the assessement of the seismic site effects, Romanian Reports in Physics, 65 (1): 285–298.
[4] Bala A, (2014) Quantitative modelling of seismic site amplification in an earthquakeendangered capital city: Bucharest, Romania, Natural Hazards, 72(3): 1429-1445.
[5] Ciugudean - Toma V., Stefanescu I., 2006, Engineering geology of the Bucharest city area, Romania, paper presented to IAEG 2006, Engineering Geology for tomorrow’s cities, paper no. 235.
[6] Liteanu G., 1952, Geology of the city of Bucharest. Technical Studies, Series E, Hydrogeology, No.1 (in Romanian).
[7] Lungu D, Calarasu E, Some aspects regarding seismic microzonation of the City of Bucharest, EE-21C Int. Conf. Earthquake Engineering in the 21st Century, Strong Ground Motion, Engineering Seismology, Earthquake hazard and risk assessment, Skopje Macedonia, 28 Aug. – 1 Sept. 2005.
[8] Marmureanu Gh., Cioflan C., Marmureanu A., 2010, Cercetari privind hazardul seismic local (microzonare) a zonei metropolitane Bucure?ti, Ed. Technopress, in Romanian, ISBN 978-973-702-809-9.
[9] Toma-Danila D, Bala A, Arion C (2021) Shear-wave velocity database for Bucharest, Mendeley Data, doi: 10.17632/jncnc6fng9, available at
[10] P100-1 (2013) Romanian seismic design code for buildings.
Part of the presented work received support through “Nucleu” Programme MULTIRISC, funded by the Ministry of Research, Innovation, and Digitalization, as well as through the SETTING Project “Integrated thematic services in the field of Earth observation: a national platform for innovation,” No. 108206, co-financed from the Regional Development European Fund (FEDR) through the Operational Competitivity Programme 2014-2020. The contribution of the Pre-Quake project (number PN-III-P1-1.1-PD-2019- 0969) in supporting this paper is also acknowledged.
Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022
22nd International Multidisciplinary Scientific GeoConference SGEM 2022, 04 - 10 July, 2022
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
04 - 10 July, 2022
surface geology, seismic velocities, earthquake hazard, peak ground

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