The Turrialba had this March 29 a diversified behavior:
During the morning, degassing, consisting of water vapor, gas and aerosols, was vigorous and characterized by a plume under 500 meters in height.
Then the composition of the degassing was composed mainly of gases and aerosols.
At 20:01 local time, a passive eruption of ash, rising less than 200 meters above the crater, extended for 10 minutes, dispersed to the northwest.
Sources: Red sismologica nacional & Ovsicori
At the Piton de La Fournaise, the seismic activity, sustained for the last weeks, reflects a rise in pressure of the volcano.
The number of volcanic earthquakes under the summit cone is increasing:
• March 23: 5 - VT earthquake of greater magnitude duration 8.92 s Magnitude of duration: 1.03
• March 24: 2 - VT earthquake of greater magnitude duration: 3.76 s Magnitude of duration: 0.28
• March 25: 6 - VT earthquake of greater magnitude duration: 12.28 s Magnitude of duration: 1.31
• March 26: 5 - VT earthquake of greater magnitude duration: 11.28 s Magnitude of duration: 1.23
• March 27: 5 - VT earthquake of greater magnitude duration: 7.36 s Magnitude of duration: 0.86
• March 28th - 29th: 14th - VT earthquake of greater magnitude duration: 8.32 s Magnitude of duration: 0.97
• March 30: 5 - VT earthquake of greater magnitude duration: 4.2 s Magnitude of duration: 0.38
The OVPF records inflation, both in the upper zone, under pressure from a shallow source, and in the far field, under pressure from a deep source.
The concentrations of H2S and SO2 at the top are below or near the detection limit.
Piton de La Fournaise - Illustration of the summit deformation from 30.01.2018 to 30.03.2018 over 2 months. Here is shown a baseline (variation of distance between two GPS receivers) crossing the crater Dolomieu. A rise is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions.
In Villarica, Pucón's camera recorded on March 29 at 11:43 a small emission of particles, in the form of a light plume that reached 200 meters above the summit; it is due to a collapse inside the chimney.
The Sentinel 2 satellite gives us two beautiful pictures of Japanese volcanoes: Sakura-jima and Fuji-San.
To see in full screen: click on the photo to enlarge