B018 Multicomponent Velocity Analysis with Quaternions A. Grandi* (University of Pisa presently in Total E&P UK Ltd) A. Mazzotti (University of Pisa) & E. Stucchi (University of Milano) SUMMARY Multicomponent seismic data are acquired by orthogonal geophones that record a vectorial wavefield. Since the single component recordings are not independent the processing and in particular the velocity analysis should be performed jointly for all the components. A way to perform vectorial processing is to exploit quaternions hyper-complex numbers that for their very nature are apt to represent multidimensional data. As an application we show the quaternion velocity analysis for an