1,720,998 research outputs found
Insights on surface wave dispersion and H/V curves: joint inversion via Pareto optimality
No full textGeometry and mechanical and crustal properties in NE Italy based on seismic and gravity data
No full textCaratteristiche meccaniche crostali nelle alpi sud-orientali tratte da interpretazione gravimetrica sulla base di due profili sismici
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Integration of high-resolution seismics and multi-offset GPR for shallow freshwater basins studies: a case history from the Cheko Lake area (Russia)
No full textThe FEM in the interpretation of tilt/strainmeter observations in a cave: Air pressure loading effects.
No full textJOURNAL OF THE GEODETIC SOCIETY OF JAPA
Subsurface deformations induced by rainfall and atmospheric pressure: tilt/strain measurements in the NE-Italy seismic area
No full textRemarkable tilt-strain anomalies preceding two seismic events in Friuli (NE Italy): their interpretation as precursors
No full textVelocity spectra and seismic-signal identification for surface waveanalysis
No full textRayleigh-wave dispersion is observed every time acoustic impedance stratification occurs, and its analysis is suitable for vertical shear-wave profile reconstruction. Accurate dispersion-curve identification is essential in order to properly determine the shear-wave velocity distribution of a medium.Data sets characterized by several events generate complex velocity spectra that can lead to possible misinterpretations. We analyse a real data set by taking into account theoretical dispersion curves and synthetic data obtained from numerical simulations in order to avoid possible pitfalls that couldarise from the complex trends exhibited in the f–k (frequency–wavenumber) and v–f (velocity–frequency) domains. In the v–f domain in particular, we show that reflection events and their multiples generate coherences that could be misinterpreted because of their similarity to typical higher-modedispersion curves. Another observed signal is interpreted in terms of guided waves and related phenomena. The results of the fundamental-mode dispersion curve inversion performed via genetic algorithms indicate a sedimentary cover stratification that simple reflection analysis cannot reveal.The present case study highlights the importance of a synergic approach, based on integrated synthetic and field data analysis, for correct interpretation of all the wavefield components in thevelocity spectrum
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