On July 11, the Japanese Meteorological Agency made observations from the ocean around Nishinoshima using the oceanic observation vessel "Ryofumaru".
At Nishinoshima, a large amount of volcanic ash was continuously ejected from the summit crater, confirming that the active eruption activity was continuing. In addition, large volcanic blocks dispersed to the foot of the pyroclastic cone and red hot lava erupted about 200 m above the edge of the crater overnight.
Nishinoshima - Lava fountain accompanied by bombs, ash plume and gas, rising up to about 200 m above the edge of the crater. A fault-shaped topography was found on the south side of the summit crater (arrow) - Doc. JMA 11.07.2020 / 8.18 p.m.
Nishinoshima area requiring caution (about 2.5 km from the summit crater) The topography of the seabed is prior to the eruption and is different from the current situation. - Doc. JMA 07.11.2020
Currently, Nishinoshima has issued a crater warning (danger of Iriyama), and continues to be cautious of volcanic bombs and lava flows that trace the trajectory of the eruption in a range of about 2 , 5 km from the summit crater.
To be continued, on July 20, the JMA will also carry out observations from the sea with the oceanic weather observation vessel "Keifumaru".
In the northern Kurils, a modest eruptive activity continues at the Ebeko, with an explosive plume at 3,100 meters asl. Drifting towards the south-east of the volcano over 5 km.
The aviation code remains in orange, explosions accompanied by ash are possible at any time, up to a height of 6,000 meters.
Source: KVERT - 16.07.2020 / 01h56Z
The IGEPN reports an upward trend in the surface activity of the Reventador on July 15, 2020.
The seismicity is characterized by 2 earthquakes LP2 explosion earthquakes, 2 episodes of emission tremor and one of harmonic tremor.
At the end of the day, the various gas and ash emissions did not exceed 700 meters above the crater.
The other parameters do not show changes.
The alert level remains in Naranja.
Nevados de Chillan - interpretation of Sentinel-2A images on 15.07.2020 at the morphology level of the Nicanor crater and its flows
Analysis of the satellite images of July 13 (SkySatCollect) and July 14 (Sentinel-2A- by the Sernageomin) made it possible to specify the current morphology of the Nicanor crater and the lava flows called "L5" and "L6" of the Nevados de Chillan complex.
The flow "L5" extends over 268 meters from the north edge of the crater,) an average speed of 0.8 m / h. A new lobe has developed and passed the eastern edge of the crater, and descends 55 meters east; it was detected by cameras on July 14.
Another body of lava, called "L6", also exceeded the northern limit of the Nicanor crater, and extends for 194 meters on the northeast flank.
The Sernageomin classifies the flows "L5" and "L6" as distinct: with differences in texture, speed and distribution.
The technical alert remains to amarilla.
Source: Sernageomin - REAV 07.15.2020