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

  • Florin PavelEmail author
  • Radu Vacareanu
Technical Paper


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.


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


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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.


  1. Abrahamson NA, Gregor N and Addo K (2016), “BC Hydro Ground Motion Prediction Equations for Subduction Earthquakes,” Earthquake Spectra, 32: 23–44.CrossRefGoogle Scholar
  2. Boore DM, Skarlatoudis AA, Margaris BN, Papazachos CB and Ventouzi C (2009), “Along-Arc and Back-Arc Attenuation, Site Response, and Source Spectrum for the Intermediate-Depth 8. January 2006 M 6.7 Kythera, Greece, Earthquake,” Bulletin of the Seismological Society of America, 99: 2410–2434.CrossRefGoogle Scholar
  3. Carbunar OF and Radulian M (2011), “Geometrical Constraints for the Configuration of the Vrancea (Romania) Intermediate-Depth Seismicity Nest,” Journal of Seismology, 15: 579–598.CrossRefGoogle Scholar
  4. Dhakal YP, Takai N and Sasatani T (2010), “Empirical Analysis of Path Effects on Prediction Equations of Pseudo-Velocity Response Spectra in Northern Japan,” Earthquake Engineering and Structural Dynamics, 39: 443–461.Google Scholar
  5. EN 1998–1 (2004), “Design of Structures for Earthquake Resistance–Part 1 General Rules, Seismic Actions and Rules for Buildings,” CEN, Bruxelles ESM Google Scholar
  6. Working Group (2015), European Strong-Motion Database, Version 0.1 Network Activity 3. Networking Acceleration Networks and SM Data Users Project NERA ( Scholar
  7. Ivan M (2007), “Attenuation of P and pP waves in Vrancea area–Romania,” Journal of Seismology, 11: 73–85.CrossRefGoogle Scholar
  8. Konno K and Ohmachi T (1998), “Ground-Motion Characteristics Estimated from Spectral Ratio Between Horizontal and Vertical Components of Mircrotremor,” Bulletin of the Seismological Society of America, 88: 228–241.Google Scholar
  9. Morozov IB (2008), “Geometrical Attenuation, Frequency Dependence of Q, and the Absorption Band Problem,” Geophysical Journal International, 175: 239–252.CrossRefGoogle Scholar
  10. Oth A, Bindi D, Parolai S and Wenzel F (2008), “S-Wave Attenuation Characteristics Beneath the Vrancea Region in Romania: New Insights from the Inversion of Ground-Motion Spectra,” Bulletin of the Seismological Society of America, 98: 2482–2497.CrossRefGoogle Scholar
  11. Pavel F and Vacareanu R (2015), “Kappa and Regional Attenuation for Vrancea (Romania) Earthquakes,” Journal of Seismology, 19: 791–799.CrossRefGoogle Scholar
  12. Pavel F, Vacareanu R, Radulian M and Cioflan C (2015), “Investigation on Directional Effects of Vrancea Subcrustal Earthquakes,” Earthquake Engineering and Engineering Vibration, 14: 399–410.CrossRefGoogle Scholar
  13. Popa M, Radulian M, Grecu B, Popescu E and Placinta AO (2005), “Attenuation in Southeastern Carpathians Area: Result of Upper Mantle Inhomogeneity,” Tectonophysics, 410: 235–249.CrossRefGoogle Scholar
  14. Radulian M, Mandrescu N, Panza GF, Popescu E and Utale A (2000), “Characterization of Seismogenic Zones of Romania,” Pure and Applied Geophysics, 157: 57–77.CrossRefGoogle Scholar
  15. Russo RM, Mocanu V, Radulian M, Popa M and Bonjer KP (2005), “Seismic Attenuation in the Carpathian Bend Zone and Surroundings,” Earth and Planetary Science Letters, 237: 695–709.CrossRefGoogle Scholar
  16. Sokolov V, Bonjer KP, Wenzel F, Grecu B and Radulian M (2008), “Ground-Motion Prediction Equations for the Intermediate Depth Vrancea (Romania) Earthquakes,” Bulletin of Earthquake Engineering, 6: 367–388.CrossRefGoogle Scholar
  17. Sørensen MB, Stromeyer D and Grünthal G (2010), “A Macroseismic Intensity Prediction Equation for Intermediate Depth Earthquakes in the Vrancea Region, Romania,” Soil Dynamics and Earthquake Engineering, 30: 1268–1278.CrossRefGoogle Scholar
  18. Vacareanu R, Radulian M, Iancovici M, Pavel F and Neagu C (2015), “Fore-Arc and Back-Arc Ground Motion Prediction Model for Vrancea Intermediate Depth Seismic Source,” Journal of Earthquake Engineering, 19: 535–562.CrossRefGoogle Scholar
  19. Wald DJ, Allen TI (2007), “Topographic Slope as a Proxy for Seismic Site Conditions and Amplification,” Bulletin of the Seismological Society of America, 97: 1379–1395.CrossRefGoogle Scholar
  20. Wenzel F, Achauer U, Enescu D, Kissling E, Russo R, Mocanu V and Musacchio G (1998), “Detailed Look at Final Stage of Plate Break-off is Target of Study in Romania,” EOS Transactions AGU, 79: 589–600.CrossRefGoogle Scholar
  21. Woessner J, Danciu L, Giardini D, Crowley H, Cotton F, Grünthal G, Valensise G, Arvidsson R, Basili R, Demircioglu MB, Hiemer S, Meletti C, Musson RMW, Rovida AN, Sesetyan K, Stucchi M and the SHARE Consortium (2015), “The 2013 European Seismic Hazard Model: Key Components and Results,” Bulletin of Earthquake Engineering, 13: 3553–3596.CrossRefGoogle Scholar

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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