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Title: Ground Motion Modeling in the Eastern Caucasus

In this paper, we analyzed the performance of a preliminary three-dimensional (3D) velocity model of the Eastern Caucasus covering most of the Azerbaijan. The model was developed in support to long-period ground motion simulations and seismic hazard assessment from regional earthquakes in Azerbaijan. The model’s performance was investigated by simulating ground motion from the damaging Mw 5.9, 2012 Zaqatala earthquake, which was well recorded throughout the region by broadband seismic instruments. In our simulations, we use a parallelized finite-difference method of fourth-order accuracy. The comparison between the simulated and recorded ground motion velocity in the modeled period range of 3–20 s shows that in general, the 3D velocity model performs well. Areas in which the model needs improvements are located mainly in the central part of the Kura basin and in the Caspian Sea coastal areas. Comparisons of simulated ground motion using our 3D velocity model and corresponding 1D regional velocity model were used to locate areas with strong 3D wave propagation effects. In areas with complex underground structure, the 1D model fails to produce the observed ground motion amplitude and duration, and spatial extend of ground motion amplification caused by wave propagation effects.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Azerbaijan National Academy of Sciences, Baku (Azerbaijan)
Publication Date:
Report Number(s):
LLNL-JRNL-679075
Journal ID: ISSN 0033-4553; PII: 1311
Grant/Contract Number:
AC52-07NA27344
Type:
Published Article
Journal Name:
Pure and Applied Geophysics
Additional Journal Information:
Journal Volume: 173; Journal Issue: 8; Journal ID: ISSN 0033-4553
Publisher:
Springer
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; wave propagation modeling; strong ground motion; finite-difference technique; 3D velocity model; Azerbaijan; Kura basin
OSTI Identifier:
1253046
Alternate Identifier(s):
OSTI ID: 1376019