Probabilistic seismic hazard map for Bulgaria as a basis for a new building code

Simeonova, Stela; Solakov, Dimcho; Leydecker, Günter; Busche, H.; Schmitt, Timo; Kaiser, Diethelm

doi:10.5194/nhess-6-881-2006

Cited by 32 publications

(18 citation statements)

References 14 publications

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“…Characterization of seismic activity and temporal distribution of earthquake recurrence. (Kramer, 1996) DSHA and PSHA have been performed by different researchers in specific sites according to their project goals and importance (Chandler et al 2001;Fat-Helbary and Tealb 2002;AlHomoud, 2003;Ardeleanu et al 2005;Simeonova et al 2006;Orhan et al 2007;Nakajima et al 2007;Tosun and Seyrek, 2006;Tosun et al 2007;Seyrek and Tosun, 2011).…”

Section: Maximum Design Earthquake (Mde) or Safety Evaluation Earthqumentioning

confidence: 99%

Selection of the Appropriate Methodology for Earthquake Safety Assessment of Dam Structures

Tosun¹,

Seyrek²

2012

Advances in Geotechnical Earthquake Engineering - Soil Liquefaction and Seismic Safety of Dams and Monuments

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Section: Maximum Design Earthquake (Mde) or Safety Evaluation Earthqumentioning

confidence: 99%

Selection of the Appropriate Methodology for Earthquake Safety Assessment of Dam Structures

Tosun¹,

Seyrek²

2012

Advances in Geotechnical Earthquake Engineering - Soil Liquefaction and Seismic Safety of Dams and Monuments

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“…From these different catalogues Ardeleanu et al (2005) and Simeonova et al (2006) compiled a homogeneous earthquake catalogue.…”

Section: Earthquake Catalogue and Seismic Source Zonesmentioning

confidence: 99%

“…An overview about these approaches is already given in Ardeleanu et al (2005) for Romania and in Simeonova et al (2006) for Bulgaria. The presented earthquake hazard maps are an update respectively improvement of the maps in Ardeleanu et al (2007).…”

Section: Introductionmentioning

confidence: 99%

Probabilistic seismic hazard in terms of intensities for Bulgaria and Romania – updated hazard maps

Leydecker

Busche

Bonjer

et al. 2008

Nat. Hazards Earth Syst. Sci.

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Abstract. Since 2007 Bulgaria and Romania are members of the European Union. All member states have to introduce the European earthquake building code EUROCODE 8 (EC 8) in the coming years. Therefore, new seismic hazard maps have to be calculated according to the recommendations in EC 8.Here the authors present a novel approach to compute such hazard maps. We prefer to use the macroseismic intensity as hazard parameter because of two reasons:-The irregular azimuthal attenuation pattern of the Vrancea intermediate depth earthquakes can be advantageously taken into account by using detailed macroseismic maps.-The intensity is directly related to the degree of damage and is the original information in the historical earthquake catalogues.The main base of our probabilistic analysis is the earthquake catalogue for SE-Europe (Shebalin et al., 1998) in combination with national and regional catalogues. Fore-and aftershocks were removed. Seismic source zones inside an area of about 200 km around Romania and Bulgaria were defined based on seismicity, neotectonics and geological development. For each seismic source the intensity-frequency relation was calculated and a maximum possible earthquake as well as a seismogenic depth was estimated. An appropriate attenuation law was assumed. To cope with the irregular isoseismals of the Vrancea intermediate depth earthquakes, a factor was included in the macroseismic attenuation law. Using detailed macroseismic maps of three strong intermediate depth earthquakes, was calculated for each observation. Strong local variations of are avoided by averaging The contributions of all seismic sources, the crustal normal depth source zones and the Vrancea intermediate depth zone, were summed up and the annual probability of exceedance was calculated. The contribution of the Vrancea intermediate depth zone to each grid point was computed with the corresponding representative of this point; a seismogenic depth of 120 km has been assumed.Each final seismic hazard map is a combination of two maps, the one for normal depth source zones and the one for the Vrancea intermediate depth zone. This is illustrated for a recurrence period of 475 years. Additional hazard maps were calculated for different recurrence periods.

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“…This evaluation is based on the observed damages -effects in a limited area (Grünthal, 1998). The knowledge of macroseismic intensities and the visualization of their spatial distribution are of great importance for earthquake hazard analysis and seismic risk studies (Armas, 2006;Godermatz et al, 2003;Simeonova et al, 2006). To evaluate the occurrence of large earthquakes and associated seismic risk, appropriate maps have been published for several countries across the world.…”

Section: Introductionmentioning

confidence: 99%

Maximum macroseismic intensity map of Greece for the time period 1953–2011

et al. 2013

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The aim of this paper is to present the spatial distribution of macroseismic intensities assigned in modified Mercalli (MM) scale, across the Greek territory. For this purpose, a digital database with more than 30,000 local seismic intensity recordings from 156 major earthquake events that affected Greece and adjacent areas during the period 1953-2011 was developed. These events have focal depths up to about 150 km and surface-wave magnitudes (Ms) greater than 4.4. Various GIS-based techniques for data analysis and map creation were applied. A number of seismic intensity maps have been produced taking into account different attributes like intensities for shallow or deep events, maximum intensities by administrative units, maximum intensity for significant earthquakes, etc. The main map produced is the national map of maximum seismic intensities for shallow earthquakes (scale 1:1.500.000). The final layout also contains the maximum seismic intensities for deep earthquakes, the tectonic lines of Greece, the earthquakes of the database as well as the seismic intensities for two significant earthquakes in the last six decades.

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Probabilistic seismic hazard map for Bulgaria as a basis for a new building code

Cited by 32 publications

References 14 publications

Selection of the Appropriate Methodology for Earthquake Safety Assessment of Dam Structures

Selection of the Appropriate Methodology for Earthquake Safety Assessment of Dam Structures

Probabilistic seismic hazard in terms of intensities for Bulgaria and Romania – updated hazard maps

Maximum macroseismic intensity map of Greece for the time period 1953–2011

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