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Investigation on regional attenuation of Vrancea (Romania) intermediate-depth earthquakes

  • Florin Pavel
  • Radu Vacareanu
Technical Paper
  • 26 Downloads

Abstract

This paper aims at investigating possible regional attenuation patterns in the case of Vrancea (Romania) intermediate-depth earthquakes. Almost 500 pairs of horizontal components recorded during 13 intermediate-depth Vrancea earthquakes are employed in order to evaluate the regional attenuation patterns. The recordings are grouped according to the azimuth with regard to the Vrancea seismic source and subsequently, Q models are computed for each azimuthal zone assuming similar geometrical spreading. Moreover, the local soil amplification which was disregarded in a previous analysis performed for Vrancea intermediate-depth earthquakes is now clearly evaluated. The results show minor differences between the four regions situated in front of the Carpathian Mountains and considerable differences in attenuation of seismic waves between the forearc and backarc regions (with regard to the Carpathian Mountains). Consequently, an average Q model of the type Q(f) = 115×f 1.25 is obtained for the four forearc regions, while a separate Q model of the type Q(f) = 70×f0.90 is computed for the backarc region. These results highlight the need to evaluate the seismic hazard of Romania by using ground motion models which take into account the different attenuation between the forearc/backarc regions.

Keywords

Fourier amplitude spectrum azimuth dependency source-to-site distance Q model local soil conditions 

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Notes

Acknowledgement

This work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation, CNCS–UEFISCDI, project number PN-II-RU-TE-2014-4-0697. The support is gratefully acknowledged. The constructive feedback from one anonymous reviewer and from the Editors is also greatly appreciated.

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Copyright information

© Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Seismic Risk Assessment Research CenterTechnical University of Civil EngineeringBucharestRomania
  2. 2.Seismic Risk Assessment CenterTechnical University of Civil Engineering BucharestBucharestRomania

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