News of Bogoslof, Reventador, Erta Ale and Poas.

In Bogoslof, the eruption of 22 January at 14:09 AKST / 23:09 UTC was detected by the lightning detection network, in the absence of seismic data interpretable following strong winds of storm. A satellite has located a volcanic cloud reaching more than 9,000 meters and moving northward. The aviation code is revised to red and the level of volcanic alert to Warning.

Source: AVO

In Ecuador, the activity of the Reventador is maintained at a high level.
At seismicity level, there are 3 episodes of emission tremor, 4 harmonic tremor, 25 LP earthquakes and 32 explosions.
The volcano being discovered, the observation of a plume with little ash was possible, moving towards the north.

Source: IGEPN

The thermal anomaly, detected by Mirova at the Erta Ale volcano since January 18, remains at a very high level: the energy index was included on January 22 between 5,882 MW and 7,368 MW, after a peak on January 21 at 13,434 MW.
In the Sentinel image of January 19, one sees the overflow of the lava following the edge of the caldera.

Sources: Mirova & Sentinel

In August 2016, a team of scientists used a drone equipped with a sonar to measure the depth of the laguna Caliente of Poas. Because of the acidity of the lake, it was propelled by an overhead engine of 350 W, giving it a speed of 3 km / h. ; It was autonomous, due to unguaranteed visibility due to gas emissions.
Some measurements: pH of acid water: 0.5 - temperature: 55 ° C - surface of the lake: 72.387 m² - volume: 974.207 m³. The depth of the lake, about 30 meters long, the layers of sulfur accumulated at the bottom, the subaquatic fumaroles, are largely responsible for the gray color of the lake.

Sources: Ovsicori & VSF / Volcanoes Sin Fronteras