Figure 4
From: Gas flux cyclic regime at an open vent magmatic column inferred from seismic and acoustic records
Location of acoustic activity revealed by the microphone array. (a) Infrasound waveform corresponding to the same time window with Fig. 3. (b) Temporal change in back azimuth of the infrasound signal. Colour scale represents signal coherence in array analysis. Coherent signal arrives from the direction of ~270°N throughout the QP-PP-EP cycle. (c) Projection of sound azimuth onto Digital Elevation Model. Red arrow indicates the corresponding infrasound azimuth which directs to the C crater. The map around the crater was created using Matlab ver. 7.5.0.338 (R2007b). Seismic waveform in the same time window is shown in Fig. 3.
