Abstract: A characteristic of a target layer is determined by receiving primary wave data and secondary wave data from multi-component receivers for acquiring both primary wave data and secondary wave data in a seismic exploration system, calculating a Vp/Vs ratio by correlating in a frequency domain a number of estimated primary wave spectra derived from a measured secondary wave spectrum to a measured primary wave spectrum, wherein Vp is a first velocity of a primary wave and Vs is a second velocity of a secondary wave for a target depth interval, using a warp factor associated with the Vp/Vs ratio, calculating a time separation for primary wave signals from a top and a bottom of the target depth interval.