First arrival traveltime calculation and path tracing is the key of tomography based on ray theory.Linear traveltime
interpolation (LTI) algorithm has high tracing accuracy and efficiency,which has been widely used in 2-D condition.However,for
3-D problem,minimum traveltime equation cannot obtain analytic solution.Therefore,on the basis of LTI,an improved grid
successive subdivision method was proposed.The method is based on the original LTI network interface subdivision
algorithm,which carry out further search by establishing same mode subdivision point array close to the minimum-traveltime
subdivision point to obtain minimum-traveltime.The method avoids global search caused by the increase of subdivision
accuracy and saves computation time.Meanwhile,the method solves 3-D LTI minimum-traveltime computation problem and
can achieve higher calculation accuracy with less computation amount.Model testing and actual data application results
proved the modification of computation accuracy and efficiency.
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