News of Sabancaya, Shinmoedake, Piton de la Fournaise and Yellowstone Lake.

Activity in Sabancaya / Peru during the week was moderate, with an average of 18 explosions per day, accompanied by ash and gas plumes reaching a maximum height of 4,700 m above the crater. and dispersed southwest 50 km.

The seismicity includes LP earthquakes, related to the movements of fluids and emission tremor. Hybrid earthquakes associated with the rise of magma are low in number and energy.

The sulfur dioxide flux was recorded at a high of 2,855 tonnes / day on March 30th.

Six thermal anomalies are reported by Mirova, between 1 and 22 MW.

Sources: IG Peru / OVI / Ingemmet

The JMA reports an increase in volcanic earthquakes at Shinmoedake in the previous days, with 5 episodes per day, then 10 episodes / day, and finally 59 episodes per day. The tremor is not observed.

The alert level remains at 3.

Sources: JMA & NBC News
 

Following a new increase in seismicity and inflation at Piton de La Fournaise, the prefecture has decided to go into phase "probable or imminent eruption / alert 1.

"The volcanological observatory of Piton de la Fournaise records since 5:50, Tuesday, April 3, 2018, an increase in the number of earthquakes of increasing intensity and persistent deformations at the top of the volcano.

An eruption is therefore likely in the near future.

Under these conditions, the prefect of Reunion decided to trigger the alert 1: "probable or imminent eruption" of the plan ORSEC * Volcano, from this Tuesday, April 3, 2018 at 6:00.

As a result, public access to the upper part of the Piton de la Fournaise enclosure, whether from the Pas de Bellecombe Trail or from any other trail is prohibited. It is recalled that the installation of aircraft in the area of ​​the volcano is regulated and subject to authorization from the Prefecture. "

Just before 11:00, the apparatus of the volcanological observatory recorded an eruptive tremor towards the rampart at the level of the Nose Coupé de Sainte-Rose. A strong seismic signal indicating that the lava is close to the surface recorded by the observatory ... making the alert level 2-2 / eruption in progress.

Souces: Prefecture of Reunion, local media
 

Update 16h GMT: the first images of the eruption by ImazPress and an interview of volcanologists on info first.

After a fairly long five-hour seismic crisis, given the distance from the summit, the relatively small eruption occurred on the north flank, inside the Enclos and near the Nez Coupé de Sainte-Rose.

The images show a fairly long crack and the formation of a projection cone around a vent.

The flows are about 200 meters, which is modest given the steep slope.

Despite poor weather conditions, Aline Peltier reports that the eruption is observable from the Piton Partage.

Yellowstone Lake is a large freshwater reservoir of altitude, covering 341 km². It is essentially part of the volcano caldera and has many hydrothermal vents on the lake floor.
The purpose of the HD-YLAKE / Hydrothermal Dynamics of the Yellowstone Lake project is to understand the relationships between long-term hydrothermal activity and its influence on aquatic ecosystems and climate processes in the lake and its watershed.
The latest core drilling studies reveal a content of hydrothermal explosion deposits, suggesting numerous small repeated explosions in Yellowstone Lake. Geochemical and mineralogical analyzes will provide information on the composition of hydrothermal waters beneath the lake floor, and on extension of the hydrothermal vents field.
In addition, the study of unicellular organisms, pollens, charcoal and typhospores preserved in cores will link the response of the lake with its climatic, hydrothermal and geological past.

Sources:
- YVO - Exploring the depths of Yellowstone Lake
- EOS - Exploring the restless floor of Yellowstone Lake