The Klyuchevskoy continues its activity with ash explosions and a rising plume at times up to 8.000 meters asl., before extending 45 km to the SSO. A 33 x 26 km ash cloud was observed at 190 km at the volcano's SSO.
Analysis of the image of the May 28 eruption at Bogoslof by C.Waythomas / AVO: on the left, pyroclastic materials are observed on the water, floating or representing an enlargement of the island; tephra jets are observed, common in shallow underwater eruptions; On the right, a base surge spreads from the base of the eruptive column on the tuff ring - AVO image / licensed Digital Globe.
At Bogoslof, a brief explosion, less than 10 minutes, began on June 1 at 2:42 UTC. It was detected by seismic and infrasonic systems, and a small volcanic cloud observed on the satellite images.
The ash plume rose to more than 7,000 meters, and drifted towards the Bering Sea.
The explosion was preceded by a seismic swarm of several hours. The level of alert is unchanged: Orange / Watch.
Source: Alaska Volcano Observatory.
Following the observations (swelling of the building, seismic activity ...) of the Piton de la Fournaise volcanological observatory (OVPF) and the land reconnaissance carried out on 30 May 2017 by the services (OVPF, ONF, BRGM, PGHM and EMZPCOI), the prefect of La Réunion decided to return to the phase of VIGILANCE of the specific device ORSEC of the volcano / "possible eruption or presence of risks on the sector" as of Friday June 2, 2017 at 6:00.
Access to the upper part of the enclosure remains strictly limited to the following two signposted paths:
- No de Bellecombe - Formica Léo - Rosemont Chapel - Sentier Rivals- Crater Caubet
- No Bellecombe - Formica Léo -Chapelle Rosemont - access to the Dolomieu crater observation site (access from the North of the crater)
Sources: OVPF & Reunion Prefecture.
Some pictures of yesterday's activity at Sakurajima and Sinabung on May 31st.