News from Turrialba, Piton de la Fournaise, Villarica, Sakurajima and Mt.Fuji.

Turrialba - 29.03.2018 / 20h03 - RSN webcam

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

Piton de La Fournaise, summit crater Dolomieu - photo archives © Bernard Duyck

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.

Source: OVPF

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.

Source: POVI