Fig. 5From: Combined use of repeated active shots and ambient noise to detect temporal changes in seismic velocity: application to Sakurajima volcano, JapanTemporal changes in relative seismic velocity for the V.SFT2–V.SKD2 pair. The results for 1–2, 2–4, and 4–8 Hz are shown from the top to the bottom. Black dots are the relative seismic velocity changes estimated day by day, and vertical bars show their SDBack to article page