Fig. 1From: Using infrasound to constrain ash plume riseInfrasound signals and velocity profiles. The recorded infrasound signals, de-trended and high-pass filtered (0.1 Hz) for removal of very long-period noise/drift (a, c), and calculated mass velocity profiles (b, d) for event 2 (a, b), and event 17 (c, d)Back to article page