Fig. 4

Inter-station cross-correlation functions for T–T (top left), R–R (top right), Z–Z (bottom left), and (ZR–RZ)/2 (bottom right) components in the frequency range 0.1–0.5 Hz for all possible station pairs ordered by inter-station distance
Inter-station cross-correlation functions for T–T (top left), R–R (top right), Z–Z (bottom left), and (ZR–RZ)/2 (bottom right) components in the frequency range 0.1–0.5 Hz for all possible station pairs ordered by inter-station distance