SPEED INFORMATION DERIVATION METHOD OF UNDERGROUND

摘要

An objective of the present invention is to provide a method of deducing underground speed information, and more specifically to a method of deducing underground speed information, capable of rapidly and accurately deducing the speed information underground through a simple calculation process. In order to accomplish the objective of the present invention, provided is the method of deducing underground speed information, which includes: inputting an initial speed model to input an observed acoustic wave material and initial speed information (S100); creating a numeric modeling material by calculating a physical property of an underground medium based on the speed model and by estimating a sound source waveform from the observed acoustic wave material (S200); calculating an inclination direction using back-propagation based on the numeric modeling material and the observed acoustic wave material and configuring a pseudo Hessian matrix (S300); and calculating and updating the speed information using the inclination direction and the pseudo Hessian matrix (S400).