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On the selection of GMPEs for Vrancea subcrustal seismic source

Abstract

The Vrancea subcrustal seismic source is characterized by large magnitude (\(M_{W} \ge 7\)) intermediate-depth earthquakes that occur two or three times during a century on average. In this study several procedures are used to grade four candidate ground motion prediction equations proposed for Vrancea source in the SHARE project. In the work of Delavaud et al. (J Seismol 16(3):451–473, 2012) four ground motion prediction models developed for subduction zones (Zhao et al. in Bull Seism Soc Am 96(3):898–913, 2006; Atkinson and Boore in Bull Seism Soc Am 93(4):1703–1729, 2003; Youngs et al. in Seism Res Lett 68(1):58–73, 1997; Lin and Lee in Bull Seism Soc Am 98(1):220–240, 2008) are suggested as suitable for Vrancea subcrustal seismic source. The paper presents the appropriateness analysis of the four suggested ground motion prediction equations done using a dataset of 109 triaxial accelerograms recorded during seven Vrancea seismic events with moment magnitude \(M_{W}\) between 5.4 and 7.4, occurred in the past 35 years. The strong ground motions were recorded in Romania, as well as in Bulgaria, Republic of Moldova and Serbia. Based on the ground motion dataset several goodness-of-fit measures are used in order to quantify how well the selected models match with the recorded data. The compatibility of the four ground motion prediction models with respect to magnitude scaling and distance scaling implied by strong ground motion dataset is investigated as well. The analyses show that the Youngs et al. (Seism Res Lett 68(1):58–73, 1997) and Zhao et al. (Bull Seism Soc Am 96(3):898–913, 2006) ground motion prediction models have a better fit with the data and can be candidate models for Probabilistic Seismic Hazard Assessment.

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Acknowledgments

The results presented in this paper are obtained within the BIGSEES Project financed by the Romanian National Authority for Scientific Research (ANCS) under the Grant Number 72/2012. This support is gratefully acknowledged. The constructive feedback from two anonymous reviewers is greatly appreciated. Their comments and suggestions assisted us in considerably improving the quality of the manuscript.

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Correspondence to Florin Pavel.

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Vacareanu, R., Pavel, F. & Aldea, A. On the selection of GMPEs for Vrancea subcrustal seismic source. Bull Earthquake Eng 11, 1867–1884 (2013). https://doi.org/10.1007/s10518-013-9515-7

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Keywords

  • Ground motion prediction equation
  • Peak ground acceleration
  • Acceleration response spectra
  • Residual
  • Likelihood