TY JOUR TI Detecting groups of eigenfrequencies of vertical standing waves in the layered structure of the Earth’s crust KW signal processing technique KW equidistant frequencies KW eigenfrequencies KW P- and S-type elastic waves JO Solar-Terrestrial Physics AU Polyakov, A.R. AU Tsegmed, B.. PY 2025 IS 11 PB INFRA-M Academic Publishing LLC.