Control method for acquiring offset speeds of longitudinal and transverse waves based on Gaussian beam

The invention relates to a control method for acquiring the offset speeds of longitudinal and transverse waves based on a Gaussian beam. The control method comprises the following steps of: constructing a Green function in a Gaussian beam manner according to a record of earthquake wave shapes, and carrying out wave field prolongation imaging by decomposing a seismic record in a range close to a beam central point into local plane waves in different emitting directions through local slanting stacking according to the constructed Green function; respectively extracting common imaging point gathers of the longitudinal wave and the transverse wave from an obtained image by offsetting the pre-stack depth of the Gaussian beam; and updating the offset speeds of the longitudinal wave and the transverse wave in the extracted common imaging point gathers of the longitudinal wave and the transverse wave according to a common imaging point gather leveling rule, and finishing the acquiring of the offset speeds of the longitudinal wave and the transverse wave. According to the control method for acquiring the offset speeds of the longitudinal and transverse waves based on the Gaussian beam, the problem that the computing efficiency is low or the accuracy of a speed analyzing result is relative poor in the exiting method is solved.