Today, the volcano seems to have calmed down again.
This was the 4th (and so far weakest) paroxysmal phase of the volcano this year. [less]

At the same time, explosive activity at the summit crater remained at low to moderate levels, with strombolian explosions that produce ash plumes of up to 800 m height and incandescent jets visible from distance. Some of the explosions generate shock waves that can be felt and heard in up to 15 km distance, causing roofs, doors and windows of houses to rattle.
Fine ash fall occurred in Panimaché, Morelia abd Sangre de Cristo. [less]

The risk of pyroclastic flows triggered by collapse of the steep lava flow fronts is elevated.
Accompanied by elevated seismic activity, more and stronger explosions have occurred today. Ash plumes rose up to 800 m height above the crater and often produced loud shock waves that rattled roofs and windows of houses in villages Panimaché, Morelia and Panimaché II. [less]

Shock waves that rattle doors and windows and roofs in villages like Morelia, Panimache, Sangre De Cristo and others on the SW flank accompany these explosions. [less]

The lava effusion increased as well, feeding a new flow that traveled 700 m on the southern flank this morning. Weak to moderate avalanches detached from the flow front. The main hazard would be a further increase of lava emissions and/or a sudden collapse of the lava flow that could produce dangerous pyroclastic flows such as in previous similar eruptive episodes over the past months. [less]

INSIVUMEH reported few small explosions, and continuing but reduced lava effusion. This morning, the lava flow directed towards the Taniluya canyon was 300 m long. [less]

Constant degassing produces locomotive-like sounds and incandescent material ejected from strombolian activity reaches 125-200 m height and produces avalanches on the upper slopes. The lava effusion increased as well starting at 05:15 local time, and the flow towards Trinidad canyon reaches now 400 meters in length, generating avalanches. A second flow has started to move towards Ceniza canyon and avalanches from it reach 800 m length. [less]

Explosive activity in turn has weakened and consisted of strombolian eruptions with ash plumes of 2-400 m height and incandescent material being ejected to about 100 m above the crater. [less]

Heavy rains caused lahars (mud flows) into the valley of Las Lajas and El Jute, and possibly also into the Ceniza canyon. Blocks of up to 1-2 meters in diameter were reported to have been carried along in these flows. [less]

Ash plumes rose up to 1 km from the summit and moved in westerly directions for about 10 km distances. Constant glowing avalanches were observed on the upper southern flank towards the Ceniza canyon. [less]

The volcano has been in moderate effusive activity for at least the past two weeks, feeding relatively small lava flows on the upper steep slope. A sudden increase in effusion rate seems to have caused the destabilization of the lava flows, generating rockfalls that turned into pyroclastic flows. The lava flows have quickly increased from previously 200 m to about 2 km length. The surge of magma supply is also suggested by the appearance of strong tremor pulses the previous night.
In the meanwhile, explosive (strombolian) activity from the summit vent has remained weak. [less]