Previously IG reported that activity at Tungurahua was at moderate-to-high levels during 16-17 March, moderate levels during 18-21 March, and low levels on 22 March.
Minor fumarolic emissions rose above the crater rim.
LP events are related to resonances of cracks full of flowed inside the volcano.
In addition it is important to mention the presence of explosions of moderate magnitude, related to the phreatic activity.
As of the 20th of April, two phreatic explosions occurred (at and local time) on the Cristal dome complex active zone.
As of the 29th of April, IGEPN recorded a signal tremor type probably in relation with geothermal activity under the volcano.