Fig. 7From: Monochromatic infrasound waves observed during the 2014–2015 eruption of Aso volcano, JapanSource location of monochromatic infrasound waves. a Spatial distribution of the timing residual \(\epsilon\) for 10-min data during 13:30–13:40 on December 15, 2015. White cross at the crater center shows a location with the minimum value (\(\epsilon = 0.10\) s). b Source location of the 10-min infrasound records during the entire eruption period (\(\text {N}=3115\))Back to article page