基于洪水填充的H-κ扫描谱优化方法及其在沉积层结构反演中的应用OA

The H-κ stacking method,commonly used to estimate crustal thickness and velocity ratio from receiver functions,has recently been extended to extract structural parameters of sedimentary layers.However,in ancient,high-velocity sedimentary strata,the H-κ spectrum is often contaminated by a continuous high-amplitude strip near zero depth caused by the direct P-wave.This renders the traditional criterion-selecting parameters based on the global maximum stacking amplitude-invalid,making it difficult to identify the sedimentary basement interface.To address this issue,we propose an optimized H-κ scanning method based on the flood-fill algorithm.The method treats the H-κ spectrum as a two-dimensional energy terrain and analyzes its connectivity structure.It automatically identifies and removes the non-physical high-amplitude region connected to the zero-depth boundary,thereby determining the optimal H-κ parameters within a topologically closed energy basin.This approach requires no additional velocity model or empirical depth threshold and preserves the original physical framework of the H-κ method.Synthetic tests and feild data applications from a short-period dense array on the western margin of the Ordos Block demonstrate that the improved method effectively suppresses interference from the zero-depth spurious peak and accurately identifies sedimentary thickness and velocity ratio.