SS-wave reflections from conventional 3C data

Saúl Ernesto Guevara, Daniel O. Trad

This is an experiment with real data intended to identify the presence of pure S wave information (SS-waves) generated by conventional explosive sources. Currently on conventional multicomponent seismic data just P P and P S waves are usually expected and the SS wave mode is not used and even rarely identified. The Hussar 2011 3C survey data were used to this purpose. From modeling using the available velocity information, SS-waves arrive inside the Ground Roll cone. Therefore it is required noise attenuation of events such as surface waves preserving as much as possible the expected SS-waves. The resulting records show energy with the expected SS arrival time in both radial and transversal components, even though easier to identify in the transversal component. Experiment for S-wave source static corrections, together with a velocity analysis, allowed to obtain SS stack sections, both for the transverse and radial components. Interestingly, even though the analysis were carried out on the transversal component, the radial component shows a better signal. Some events can be identified at the expected arrival time. The method appears promising to obtain additional information of 3C data.