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Tectonic stress, seismicity, and seismic hazard in the southeastern Carpathians

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  • Alik Ismail-Zadeh
  • Vladimir Sokolov
  • Klaus-Peter Bonjer

Abstract

Intermediate-depth earthquakes in the Vrancea region occur in response to stress generation due to descending lithosphere beneath the southeastern Carpathians. In this article, tectonic stress and seismicity are analyzed in the region on the basis of a vast body of observations. We show a correlation between the location of intermediate-depth earthquakes and the predicted localization of maximum shear stress in the lithosphere. A probabilistic seismic hazard assessment (PSHA) for the region is presented in terms of various ground motion parameters on the utilization of Fourier amplitude spectra used in engineering practice and risk assessment (peak ground acceleration, response spectra amplitude, and seismic intensity). We review the PSHA carried out in the region, and present new PSHA results for the eastern and southern parts of Romania. Our seismic hazard assessment is based on the information about the features of earthquake ground motion excitation, seismic wave propagation (attenuation), and site effect in the region. Spectral models and characteristics of site-response on earthquake ground motions are obtained from the regional ground motion data including several hundred records of small and large earthquakes. Results of the probabilistic seismic hazard assessment are consistent with the features of observed earthquake effects in the southeastern Carpathians and show that geological factors play an important part in the distribution of the earthquake ground motion parameters. Copyright Springer Science+Business Media, Inc. 2007

Suggested Citation

  • Alik Ismail-Zadeh & Vladimir Sokolov & Klaus-Peter Bonjer, 2007. "Tectonic stress, seismicity, and seismic hazard in the southeastern Carpathians," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 42(3), pages 493-514, September.
    • Handle: RePEc:spr:nathaz:v:42:y:2007:i:3:p:493-514
    DOI: 10.1007/s11069-006-9074-1
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    References listed on IDEAS

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    1. P. Mäntyniemi & V. Mârza & A. Kijko & P. Retief, 2003. "A New Probabilistic Seismic Hazard Analysis for the Vrancea (Romania) Seismogenic Zone," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 29(3), pages 371-385, July.
    2. Georg Dinter & Günter Schmitt, 2001. "Three Dimensional Plate Kinematics in Romania," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 23(2), pages 389-406, March.
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