Modeling near-surface velocity inversion in a sediment sequence using microtremor HVSR.

We propose a rapid and cost-effective Horizontal-to-Vertical Spectral Ratio (HVSR) method that uses microtremors (ambient noise) for mapping intercalated sedimentary sequences with lateral heterogeneity for a depth of about 100 m in Lower reaches of Narmada Valley, western India. The elastic parameters for various units/layers at a given site (1D) were derived theoretically based on HVSR inversion, built on the concepts of Diffuse Field Assumption and retrieval of the imaginary part of Green's function. This approach enables efficient forward calculation, delves into the relationship between the HVSR curve and elastic parameters, and accelerates the inversion process. A site-specific priori knowledge gathered during the field visits is further integrated. We successfully derive overall shear wave velocity and density models inferring three sedimentary Units and associated Subunits. The key highlight of this study is successfully distinguishing low-velocity sedimentary Units/Subunits within a sedimentary sequence. [Display omitted] • Velocity inversion in a sedimentary sequence is inferred based on Microtremor HVSR studies. • HVSR peak resonant frequency and Vs – ρ relationship together assist to classify sediment sequence into Units and Subunits. • Integration of results from HVSR studies with priori field knowledge abets to identify the sediment types. • An inclusive terrain model is attempted by connecting the depths interfaces of Units and Subunits to build cross-sections. [ABSTRACT FROM AUTHOR]