Abstract
This paper is a multidisciplinary presentation of the seismogenic area situated in the North-Dobrogea Orogen (Tulcea). This zone is characterized by significant crustal seismic activity, with crustal earthquakes of magnitude Ms ≥ 5.0 on the Richter scale. Geological and geophysical data for the area are presented. The seismicity of the region is presented by making use of the latest catalogues, exemplified with maps and a 3D figure. Focal mechanisms with their parameters for several earthquakes are analyzed together with the observation data (provided by different seismological stations). A brief presentation of the main geological features, which are characteristic of the tectonic units that build up the North-Dobrogean Orogene, outlines the diverse petrographic constitution of the various structural levels. In order to discuss the local seismic site effects two scenarios are considered, both of which take into account the characteristics of the seismogenic area. The first one considers the city exposed to an earthquake (superficial) from the E Vrancea zone and the second one considers the city exposed to a seismic event with magnitude Mw = 5.1 from Sf. Gheorghe fault. The earthquake epicentres are located in very active seismic areas. The important features taken into account are the nonlinear behavior of the upper soil strata, the effect of the bedrock elasticity, and different shear modulus and damping of the linear-equivalent-type system. Additionally, several local amplification functions are presented.
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References
Airinei S, Stoenescu S, Velcescu G, Romanescu D, Visarion M, Radan S, Roth M, Besutiu L, Besutiu G (1983) The anomaly map of vertical component of the magnetic field (ΔZa). Institute of Geology and Geophysics, Bucharest
Atanasiu I (1961) Earthquakes in Romania (in Romanian). Editura Academiei R.S.R., Bucharest, p 194
Botezatu R, Bacioiu T, Andrei J (1961) The relationship between the gravity anomalies and the geological structure of North Dobrogea and the adjacent regions of South Moldavia and East Muntenia (in Romanian). Geological Studies and Research 1:33–56
Constantinescu L, Mârza VI (1980) A computer-compiled and computer-oriented catalogue of Romania’s earthquakes during millennium (984–1979). Rev Roum Géol Géophys Géogr Sér Géophys 24(2)193–234
Cornea I, Lazarescu V (1980) Tectonica si evolutia geodinamica a teritoriului Romaniei. Sn, Bucharest
Damian A (1974) Viteze de interval în fundamentul unor unitati structurale si semnificatia lor geologică. BTS—IPGG IV(4):23–33
Georgescu S, Costea M, Sandru O, Ticoca P, Tabirna G (1982) Aspecte seismologice si ingineresti ale cutremurului de la Tulcea din 13 noiembrie 1981. Studii si cerceteri INCERC 1–68, 5–6
Hauser F, Raileanu V, Fielitz W, Dinu C, Landes M, Bala A, Prodehl C (2007) Seismic crustal structure between the Transylvanian Basin and the Black Sea, Romania. Tectonophysics 430:1–25
Mirauta O, Mutihac V, Bandrabur T, Dragulescu A (1967) Tulcea geological map scale 1: 200,000. Geological Institute, Bucharest
Mirauta E, Panin N (1979) Tulcea geological map scale 1: 50,000. Institute of Geology and Geophysics, Bucharest
Mutihac V, Ionesi L (1974) Geology of Romania (in Romanian). Editura Tehnica, Bucharest
Oncescu M, Bazacliu O, Popescu E (1989) The Tulcea earthquake of November 13, 1981. Rev Roum Géol Géophys Géogr Sér Géophys 33:23–26
Radulescu F, Raducanu M, Raileanu V, Dragu S, Pompilian A, Sova V (1982) Parametrii elastici ai unor masive calcaroase din Dobrogea. St cerc fiz 34(2)141–154
Raileanu V, Diaconescu C, Mateciuc D, Diaconescu M (1998) Velocity crustal models under the Romanian telemetered seismological observatories. Rom Rep Physics 50(1–2):123–141
Schnabel PB, Lysmer J, Seed HB, SHAKE91 (1972) A computer program for conducting equivalent linear seismic response analyses of horizontally layered soil deposits. University of California, Davis
Seghedi A (1998) The Romanian carpathian foreland. In: Ioane D (ed) Monograph of Southern Carpathians. Reports on Geodesy, 7, vol 37. IGWiAG PW, Warsaw, pp 21–48
Seghedi A (2008) The geological and structural frame of the Black Sea neighboring terrains focusing on its north-western limit (in Romanian). In: Oaie G (ed) Natural hazard: tsunami events in the Black Sea. Bucharest, pp 11–26
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This work has been done in the framework of the National Research Program PNCDI II contract no. 31036/2007.
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Bălan, Ş. et al. (2014). Scenarios for Local Seismic Effects of Tulcea (Romania) Crustal Earthquakes—Preliminary Approach of the Seismic Risk Characterization for Tulcea City. In: Bostenaru Dan, M., Armas, I., Goretti, A. (eds) Earthquake Hazard Impact and Urban Planning. Environmental Hazards. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7981-5_5
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