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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 - 12.10.2020 - photo William Chigna, Unidad de Prevención de Volcanes, via Conred.

Fuego - 12.10.2020 - photo William Chigna, Unidad de Prevención de Volcanes, via Conred.

In Guatemala, the activity of Fuego is maintained on December 10, with weak to strong explosions, at a rate of 3 to 6 per hour; ash falls are reported on Panimache, Sangre de Cristo, Ojo de Agua, Santa Isabel, and others.

Moderate boulder avalanches are reported in the drainages, some boulders reach the vegetation limit.

A nocturnal incandescence is observed 100-200 meters above the crater.

Fuego - 12.10.2020 - photo William Chigna, Unidad de Prevención de Volcanes / Twitter

Fuego - 12.10.2020 - photo William Chigna, Unidad de Prevención de Volcanes / Twitter

OVSAN reports, for the Santiaguito, a degassing forming a white plume at a height of 3,100 m asl., accompanied by short moments of noise from aircraft turbines, and gas and ash explosions reaching 3,400 m asl.

Boulder avalanches mainly mark the southwest flank, with material reaching the base of the dome and causing fine ash to fall around the perimeter of the volcano.

Due to the location of the block lava flow on the dome of the Caliente dome, the occurrence of boulder flow, and even pyroclastic flows, in a west-southwest direction cannot be ruled out.

 

Sources: Insivumeh and Conred / Daily Bulletin.

Santiaguito - photo Edgar Cabrera, COLRED Finca El Faro / 16.11.2020

Santiaguito - photo Edgar Cabrera, COLRED Finca El Faro / 16.11.2020

At Ili Lewotolok, the plume of the main crater ranges from white, gray, brown to black, with moderate to thick intensity, about 200-300 meters from the summit.

The seismicity of December 10 is characterized by:

- 46 eruption earthquakes, with an amplitude of 6-32 mm, and an earthquake duration of 15 to 47 seconds.

- 64 emission earthquakes, with an amplitude of 2 to 24 mm and the earthquake lasted 5 to 25 seconds.

- 4 harmonic tremor episodes with an amplitude of 3-8 mm

- 9 episodes of non-harmonic tremor, with an amplitude of 1 to 4 mm

The activity level remains at 3 / siaga. Communities around G. Ili Lewotolok and visitors / climbers / tourists so that they are not located, climbed and have no activities in the danger zone in the area of ​​the G. Ili Lewotolok crater and in all areas within a 4 km radius of the G Ili Lewotolok summit / activity center.

 

Source: PVMBG, Magma Indonesia

Ili Lewotolok - 12.10.2020 / 10.54am WITA - PVMBG

Ili Lewotolok - 12.10.2020 / 10.54am WITA - PVMBG

Mauna Loa volcano is not erupting. The rates of deformation and seismicity have not changed significantly over the past week and remain above background levels for the long term.

 

Over the past week, HVO seismometers have recorded around 165 small-magnitude earthquakes (less than M2.5) at Mauna Loa, mostly below the summit and upper flanks of the volcano. The majority of these earthquakes occurred at shallow depths less than 8 kilometers (~ 5 miles) below sea level.

Seismic activity increased on the northwest flank of Mauna Loa on December 4, 2020, including a magnitude 4.1 earthquake and clusters of small, shallow earthquakes occurring at close range in time and location. Since December 4, the HVO has recorded more than 150 earthquakes in this region, at depths of 1-9 km (1-6 miles) below the surface, in an area of ​​less than 4 km (2 miles) and spanning 6 km (4 miles). North. Most of the seismicity was less than magnitude-2 and more than 4 km (2 miles) below the surface.

Swarms of previous earthquakes at this location and depth have occurred in October 2018, April 2017, July 2016, August 2015 and before.

 

Global Positioning System (GPS) measurements continue to show slow, long-term inflation at the summit, consistent with the supply of magma to the volcano's shallow storage system.

The gas concentrations and the temperatures of the fumaroles at the summit and at the sulfur cone in the southwest rift zone remain stable.

Current volcanic alert level: Advisory

Current Aviation Color Code: Yellow.

 

Source: HVO

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