Fig. 2

(Top) Nine components of the inter-station cross-correlation functions obtained in the frequency range 0.1–0.5 Hz for station pairs a UEMC06–UEMC09 and d UEMC05–UEMC13. The hatched area indicates the time window for plotting the particle motion. (Bottom) Particle motion of the causal part in the b, e R–Z and c, f T–R planes for the same station pairs