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During a quarter of a century, the main characteristics of thehorizontal-to-vertical spectral ratio of ambient noise HVSRN have beenextensively used for site effect assessment. In spite of the uncertaintiesabout the optimum theoretical model to describe these observations, severalschemes for inversion of the full HVSRN curve for near surface surveying havebeen developed over the last decade.  In this work, a computer code for forward calculation of H/V spectra based onthe diffuse field assumption (DFA) is presented and tested.It takes advantageof the recently stated connection between the HVSRN and the elastodynamicGreen's function which arises from the ambient noise interferometry theory.  The algorithm allows for (1) a natural calculation of the Green's functionsimaginary parts by using suitable contour integrals in the complex wavenumberplane, and (2) separate calculation of the contributions of Rayleigh, Love,P-SV and SH waves as well. The stability of the algorithm at high frequenciesis preserved by means of an adaptation of the Wang's orthonormalization methodto the calculation of dispersion curves, surface-waves medium responses andcontributions of body waves.  This code has been combined with a variety of inversion methods to make up apowerful tool for passive seismic surveying.

A computer code for forward calculation and inversion of the H/V spectral ratio under the diffuse field assumption