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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

In Peru, the activity of Sabancaya increased compared to the previous week, while remaining qualified as "moderate", with an average of 33 explosions per day, accompanied by plumes rising to 3,500 meters max. and dispersion to SW, S, and NE within 40 km.

The flow of sulfur dioxide is measured on March 22 at a maximum of 2,100 tons / day, considered large value.

Seismicity is dominated by LP earthquakes associated with the circulation of fluids; Hybrid earthquakes, in connection with the rise of the magma, remain weak.

A slight inflation is observed, as well as weak thermal anomalies, between 1 and 18 MW of VRP (Mirova)

 

Source: I G Peru - OVI - Ingemmet

Sabancaya - summary of the activity from 18 to 24.03.2019 - Doc. I.G. Peru - OVI - Ingemmet

Sabancaya - summary of the activity from 18 to 24.03.2019 - Doc. I.G. Peru - OVI - Ingemmet

The alert level for Ambrym is at level 2 / major trouble since 14 February 2019. The danger zone remains 1 km around Benbow, 2 km around Marum and 1 km from the main fissured areas of the south-east part of Ambrym.

The possibility that the activity of the Ambrym volcano will reach the level of minor eruption (level 3) and / or decrease to the state of lower agitation (level 1) is low at the moment.

The December 2018 eruption was concentrated in the summit caldera and affected the eastern fracture or rift zone with just a deformation of the ground and an uplift, but no eruptions occurred in this zone.

Following the seismic activity of December 2018, the layers or weak zones of these dangerous zones can collapse at any time. Due to the presence of active faults in the southeastern Ambrym area, the affected communities are advised not to access 1 km of the main cracks (danger zone). It is possible (low) that volcanic activity starts from this area.

 

Source: Vanuatu geohazards observatory

Ambrym - areas of danger and exclusion - Doc. VGO
Ambrym - areas of danger and exclusion - Doc. VGO

Ambrym - areas of danger and exclusion - Doc. VGO

Good news at Anak Krakatau: according to the results of observation and analysis of visual and instrumental data as of March 25, 2019, G. Anak Krakatau's activity level tends to decrease, even if it fluctuates slightly.

The eruptive potential still exists, but with low intensity compared to the December 2018 period, and the distribution of hazardous eruption material has spread only within a radius of 2 km from the active crater of Mount Anak Krakatau.

As a result, the level of activity is reduced to 2 / waspada,  from 25 March 2019 at 12.00 WIB, with a 2 km radius prohibited zone, due to potential phreatic or strombolian eruptions.

 

Source: Magma Indonesia - Press Conference of 25.03.2019 / 13.08 WIB

Anak Krakatau - photo via Sutopo Purwo Nugroho / BNPB 25.03.2019

Anak Krakatau - photo via Sutopo Purwo Nugroho / BNPB 25.03.2019

According to PVMBG and VAAC Darwin, ash emissions continue in Bromo, with a plume at 1,300 meters above the summit.

The drift of the ash cloud is east and north-east on the 25th and 26th of March.

 

Sources: PVMBG & VAAC Darwin

Bromo - 25.03.2019 / 11h42 WIB - photo PVMBG Magma Indonesia

Bromo - 25.03.2019 / 11h42 WIB - photo PVMBG Magma Indonesia

Bromo - Volcanic Ash Advisory for 25 and 26.03.2019 - Doc. VAAC Darwin

Bromo - Volcanic Ash Advisory for 25 and 26.03.2019 - Doc. VAAC Darwin

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