Combining surface waves and common methods for shallow geophysical survey

0439153 - ÚSMH 2016 RIV NL eng J - Journal Article
Gaždová, Renata - Kolínský, Petr - Vilhelm, J. - Valenta, Jan
Combining surface waves and common methods for shallow geophysical survey.
Near Surface Geophysics. Roč. 13, č. 1 (2015), s. 19-32. ISSN 1569-4445. E-ISSN 1873-0604
R&D Projects: GA SÚJB JC_1/2009
Institutional support: RVO:67985891
Keywords : attenuation curves * inversion * dispersion * velocity * faults
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 1.232, year: 2015

Geophysical data were acquired during a survey of the Hluboká Fault in the Czech Republic, Central Europe. The recorded surface waves are studied in the frequency range 8-200 Hz. Phase velocity dispersion curves of Rayleigh and Love waves are determined from pairs of three-component seismograms with a 5 m receiver spacing by means of a frequency-time analysis along the profile. Rayleigh waves are analysed on the vertical (Z) and radial (R) components and Love waves on the transversal (T) component. Dispersion curves from the vertical component are then inverted to 1-D S-wave velocity models using the isometric method. A set of 1-D S-wave velocity models representing a pseudo 2-D S-wave velocity distribution along the profile is obtained. This velocity distribution is compared with the results of other geophysical methods and also with direct observation from a shallow paleoseismic trenching. A combination of the S-wave velocities obtained from the surface wave analysis and P-wave velocities from refraction tomography is used to estimate the Poisson ratio distribution. It is shown that the resolution capabilities of surface waves are comparable in this case with electric resistivity tomography in near surface medium and with P-wave tomography in the depths exceeding approx. 15 metres.
Permanent Link: http://hdl.handle.net/11104/0245839