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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sinabung - ash plume of 27.05.2019 / 6h29 - photo Teger Tiganderket via Mbah Lewa

Sinabung - ash plume of 27.05.2019 / 6h29 - photo Teger Tiganderket via Mbah Lewa

The Sinabung manifested itself three times in 24 hours: after the eruption episode of 6:29 on May 27 (reported yesterday), another occurred on the same day at 23:23 WIB; the height of the eruptive column could not be observed. The seismographic recording indicates a maximum amplitude of 70 mm, lasting 12 minutes 36 seconds.

This morning, May 28 at 1:18 WIB, a third episode was recorded with a max amplitude. 120 mm and a duration of 2 minutes 32 seconds; the height of the plume could not be observed due to fog and night.

The level of alert remains at 3 / siaga, with a prohibited zone between 3 and 5 km radius depending on the sector.

 

Sources: KESDM, PVMBG, Magma Indonesia

Sinabung - seismograms of 27 and 28.05.2019 - Doc. Magma Indonesia
Sinabung - seismograms of 27 and 28.05.2019 - Doc. Magma Indonesia

Sinabung - seismograms of 27 and 28.05.2019 - Doc. Magma Indonesia

A recovery in inflation seems to be taking shape in the Piton de La Fournaise, recorded under the summit zone (pressurization of a superficial source) and in the far field (pressurization of a deep source).

Piton de La Fournaise - Illustration of the deformation over 2 months, between March 28 and May 28, 2019. Here are represented basic lines (variation of distance between two GPS receivers) crossing the building of Piton de la Fournaise, at top (at the top), at the base of the terminal cone (in the middle) and in the far field (at the bottom). A rise is synonymous with elongation and therefore swelling of the volcano, inversely a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc. OVPF

Piton de La Fournaise - Illustration of the deformation over 2 months, between March 28 and May 28, 2019. Here are represented basic lines (variation of distance between two GPS receivers) crossing the building of Piton de la Fournaise, at top (at the top), at the base of the terminal cone (in the middle) and in the far field (at the bottom). A rise is synonymous with elongation and therefore swelling of the volcano, inversely a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc. OVPF

In recent days, the number of volcano-tectonic earthquakes is up: 8 on Friday and Saturday, 14 this Sunday, and 31 earthquakes VT on May 27.

CO2 emissions are high and stable in the distal zone, at Plaine des Cafres, and in the proximal zone, at the Gîte du Volcan.

The alert level remains vigilant.

Source: OVPF

Dukono - Volcanis ash advisory for 28.05.2019 - Doc. VAAC Darwin IDY65290

Dukono - Volcanis ash advisory for 28.05.2019 - Doc. VAAC Darwin IDY65290

At Dukono, on the island of Halmahera, ash emissions continue to justify an orange aviation code for May 28 by VAAC Darwin.

The PVMBG informs for May 27, 2 earthquakes of eruption, a volcanic earthquake and continuous tremor of amplitude between 0.5 and 6 mm, dominating to 1 mm.

A white to gray plume is observed 800 meters above the summit.

The activity level remains at 2 / waspada, with a 2 km radius prohibited area around the Malupang Warirang crater.

Sources: PVMBG & VAAC Darwin

White island - photo J.Shook

White island - photo J.Shook

In New Zealand, the seismic swarm started last Thursday at White Island increased in number and magnitude of earthquakes. Of the 196 earthquakes, 22 of magnitude 3 or higher were observed on Saturday; the largest of magnitude 3.9, M3.8 and M3.8 respectively.

These earthquakes appear to be of a tectonic nature, unrelated to volcanic processes, according to the GNS. The activity parameters of the volcano do not change, but the risk of landslides is increasing, because earthquakes are localized, superficial, and affect weak materials.

The volcanic alert remains at level 1 and the aviation code is green.

 

Source: GNS

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