Velocity model of the Hronov-Po?í?í Fault Zone from Rayleigh wave dispersion

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• 作者：Petr Kolínsky (1)
  Jan Valenta (1)
  Ji?í Málek (1)
  
• 关键词：Bohemian Massif ; Surface waves ; Phase velocity ; Dispersion curve ; Seismic array ; Shear wave velocities
• 刊名：Journal of Seismology
• 出版年：2014
• 出版时间：July 2014
• 年：2014
• 卷：18
• 期：3
• 页码：617-635
• 全文大小：
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• 作者单位：Petr Kolínsky (1)
  Jan Valenta (1)
  Ji?í Málek (1)
  
  1. Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Hole?ovi?kách 41, 182 09, Prague 8, Czech Republic
  
• ISSN：1573-157X

文摘

The Hronov-Po?í?í Fault Zone (HPFZ) is an active tectonic area with regularly occurring shallow earthquakes up to magnitude 5. For their exact locations, at least an average velocity model of the area is needed. A method of measuring local phase velocities of surface waves using the array of stations deployed permanently in the HPFZ is introduced. Seven regional and teleseismic events are selected to represent different backazimuths of propagation. Applicable range of periods is estimated for each event. The coherency of the waves reaching the array is constraining the short period range. The dimension of the array is a limiting factor for the long-periods. A dispersion curve of Rayleigh wave phase velocity measured at the vertical component and characterizing 1D properties of the target area is determined using the seven measurements for the interval from 1 to 40?s. An isometric method is used to invert the determined dispersion curve for shear and longitudinal velocity distribution from the surface to the depth of 65?km.