Fast marching method (FMM) is a fast, accurate and stable traveltime computation method.This method is flexible, fast, and unconditionally stable for arbitrarily large gradient jump in velocity.

• 波前快速推进法(FMM)是一种快速、准确而稳定的走时计算方法,它不仅计算速度快、灵活性好,而且对任何复杂速度场都具有无条件稳定的特点。