Velocity model of the Hronov-Poříčí Fault Zone from Rayleigh wave dispersion

0434502 - ÚSMH 2015 RIV NL eng J - Journal Article
Kolínský, Petr - Valenta, Jan - Málek, Jiří
Velocity model of the Hronov-Poříčí Fault Zone from Rayleigh wave dispersion.
Journal of Seismology. Roč. 18, č. 3 (2014), s. 617-635. ISSN 1383-4649. E-ISSN 1573-157X
R&D Projects: GA ČR GA205/09/1244; GA MŠMT LM2010008
Institutional support: RVO:67985891
Keywords : Bohemian Massif * surface waves * phase-velocity * dispersion curve
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 1.386, year: 2014

The Hronov-Poříčí 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.
Permanent Link: http://hdl.handle.net/11104/0238542