After the explosion of May 6 (link), Nevados de Chillan was the site of two explosions on May 7, respectively at 7:43 am and 7:51 am local; two lower plumes, 1,800 and 1,500 meters, deposited volcanic material on the northeast flank of the active crater. The activity was associated with a tremor.
In Costa Rica, we will notice the emission of hot and incandescent gases through an orifice opened last year in the old dome (current fumarole mouth) of Poas this May 6 at dawn.
During the day, the hot magmatic gases fed the fumarole, with separate exhalations of 5-6 minutes, with a seismic signature.
The volcano continues to present an average of 300 earthquakes of low frequency and low amplitude per day.
The measured magmatic gas concentrations remain low, with SO2 concentrations of less than 5 parts per million (ppm), an H2S / SO2 ratio of less than 0.1 and a slight decrease in the CO2 / SO2 ratio with values around 0.7.
Strombolian activity continues at Klyuchevskoy on May 8, 2020. The lava flow continues to move on the southeast flank of the volcano (the Apakhonchich chute), phreatic bursts and the collapse of loose slag accompany this process. According to satellite data, a gas-vapor plume containing a certain amount of ash extends over approximately 35 km east of the volcano.
The KVERT notes the presence of an ash cloud at 6,000 meters asl. ; aviation code stays orange
Sources: KVERT & VAAC Tokyo
JMA pinpoints a major eruption at Sakurajima on May 8, 2020 at 7:03 a.m., accompanied by a plume of ash and gas reaching 2,000 meters above the active crater, dissipating towards the northwest.
Other episodes preceded him at 6:53 a.m. and 7:08 a.m.
Source: JMA and MyKagoshima