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• W3046192975 endingPage "2030" @default.
• W3046192975 startingPage "2015" @default.
• W3046192975 abstract "Abstract. For seismic hazard assessment and earthquake hypocentre localization, detailed shear-wave velocity profiles are an important input parameter. Here, we present a method to construct a shear-wave velocity profiles for a deep unconsolidated sedimentary layer by using strong teleseismic phases and the ambient noise field. Gas extraction in the Groningen field, in the northern part of the Netherlands, is causing low-magnitude, induced seismic events. This region forms an excellent case study due to the presence of a permanent borehole network and detailed subsurface knowledge. Instead of conventional horizontal-to-vertical spectral ratios (H∕V ratios) from amplitude spectra, we calculate power spectral densities and use those as input for H∕V calculations. The strong teleseisms provide resonance recordings at low frequencies, where the seismic noise field is too weak to be recorded well with the employed geophones and accelerometers. The H∕V ratios of the ambient noise field are compared with several forward modelling approaches to quality check the teleseism-based shear-wave velocity profiles. Using the well-constrained depth of the sedimentary basin, we invert the H∕V ratios for velocity profiles. A close relationship is observed between the H∕V spectral ratios from the ambient noise field, shear-wave resonance frequencies and Rayleigh-wave ellipticity. By processing only five teleseismic events, we are able to derive shear-wave velocities for the deeper sedimentary sequence with a 7 % bias in comparison with the existing detailed velocity model for the Cenozoic sediments overlying the Groningen gas field. Furthermore, a relation between resonance frequency and unconsolidated sediment thickness is derived, to be used in other areas in the Netherlands, where detailed depth maps are not available." @default.
• W3046192975 created "2020-08-03" @default.
• W3046192975 creator A5037008508 @default.
• W3046192975 creator A5052507776 @default.
• W3046192975 creator A5087985679 @default.
• W3046192975 date "2020-11-09" @default.
• W3046192975 modified "2023-10-01" @default.
• W3046192975 title "Using horizontal-to-vertical spectral ratios to construct shear-wave velocity profiles" @default.
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• W3046192975 doi "https://doi.org/10.5194/se-11-2015-2020" @default.
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