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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
Fuego - plume and fine ash on the summit this 05.28.2020 - photo Conred

Fuego - plume and fine ash on the summit this 05.28.2020 - photo Conred

This May 28, 2020, moderate to strong Strombolian explosions are recorded in Fuego / Guatemala, at the rate of 8-12 per hour which raise columns of ash at 4,500-4,700 meters asl., dispersing south and southwest. Moderate avalanches are recorded in the Seca, Tanilyua, Ceniza, Trinidad and Las Lajas barrancas. Fine ashes fall on the volcano observatory.

The descent of Lahar is reported in the Barra Seca, a tributary of the Pantaleon river, located on the southwest flank of the volcano at 1 p.m.

A weak to moderate lahar is present in the Ceniza barranca tributary of the Achiguate river, from 4:20 p.m. Maintaining heavy rains can result in more lahars, carrying tree branches and volcanic material.

 

Sources: Insivumeh & Conred

Klyuchevskoy - 29.05.2020 / 07h21 Seen by F.Yu. Levinson-Lessing Kamchatkan Volcanological Station (Klyuchi village) - IVS FEB webcam RAS KVERT

Klyuchevskoy - 29.05.2020 / 07h21 Seen by F.Yu. Levinson-Lessing Kamchatkan Volcanological Station (Klyuchi village) - IVS FEB webcam RAS KVERT

Klyuchevskoy - Volcanic Ash Advisory for 29.05.2020 - Doc. VAAC Tokyo

Klyuchevskoy - Volcanic Ash Advisory for 29.05.2020 - Doc. VAAC Tokyo

In Kluychevskoy, an explosive-effusive activity is maintained, with ash explosions at 5,500-6,000 meters, drifting over 400 km towards the ESE.

A lava flow continues to descend the southeast flank, accompanied by phreatic bursts.

The aviation code remains orange.

 

Sources: KVERT & VAAC Tokyo

IBU - 28.05.2020 / 7:34 WIT - Photo Magma indonesia

IBU - 28.05.2020 / 7:34 WIT - Photo Magma indonesia

Ibu - seismicity at 05.28.2020 - Doc. Magma Indonesia - one click to enlarge

Ibu - seismicity at 05.28.2020 - Doc. Magma Indonesia - one click to enlarge

In the Moluccas, the Ibu volcano presents this May 28, 2020 a white-gray plume 200-800 meters from the summit.

The PVMBG provides information on the seismicity level:

- 76 eruption earthquakes, with an amplitude of 15-30 mm, and the duration of the earthquake 18-70 seconds.

- 87 collapse earthquakes, with an amplitude of 2 to 10 mm and an earthquake duration of 12 to 65 seconds. The sliding distance and the direction of fall are not observed.

- 189 blast earthquakes, with an amplitude of 5-14 mm, and an earthquake duration of 10-50 seconds.

- 18 episodes of harmonic tremor

- 9 tectonic earthquakes with an amplitude of 2 to 10 mm, S-P 11 to 32 seconds and an earthquake duration of 30 to 95 seconds.

 

Sources: PVMBG and Magma Indonesia

Whakaari / White Island - photo NZ Herald

Whakaari / White Island - photo NZ Herald

The results of the last gas measurement flight on Wednesday May 27 at Whakaari / White Island indicate an increase in gas flow since the previous flight on May 20. While previous observations indicated a tendency to return to levels typical of this volcano, the recent increase in the flow of SO2 and CO2 gases, main indicators of volcanic disturbances, could be attributed to a new batch of magma under the low-lying volcano. depth depth.

Thermal infrared images, taken during the observation flight on Wednesday May 20, show that the lava extrusions, detected for the first time in early January, are still very hot, around 500 ° C. The hot gases that are emitted around these lava lobes generate a "night glow" which can be seen on GeoNet night vision webcams.

Occasional episodes of slightly elevated tremors are observed, although overall tremor levels remain low and in the background levels for the volcano. This week, shallow-source volcanic earthquakes are recorded. Satellite deformation measurements show that the ground around the active ventilation zone has subsided by several centimeters since the eruption in December 2019.

 

These recent observations agree with a still very dynamic volcanic system, despite several monitoring parameters tending towards pre-eruption levels. A rash could occur with little precursor activity. The plausible triggers for an eruption remain the collapse of unstable materials around the vents, the sudden release of magma gas and the rapid entry of water onto the shallow magma body.

If an explosive activity produces an ash cloud, the likelihood of ash affecting the continent remains very low. Under appropriate weather conditions, the plume of gas and vapor can be seen on the continent in the form of weak acid rain.

 The volcanic alert level remains at level 2, and the aviation color code remains yellow.

 

Source: Geonet & NZ Herald

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