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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
Popocatépetl - the overview of 23.12.2019 confirms the destruction of the dome #85 - photos Cenapred / CNPC / Seguridad

Popocatépetl - the overview of 23.12.2019 confirms the destruction of the dome #85 - photos Cenapred / CNPC / Seguridad

Popocatépetl - maximum explosive activity on 21.12.2019

After the destruction of the dome # 85 of Popocatépetl, according to the diagram on December 21, verified on December 23 during a control overflight, the Cenapred could observe the diameter of the internal crater maintained at 350 meters, for an approximate depth from 70-80 meters; the crater is covered with tephra, and no dome is visible.

Popocatépetl - the overview of 23.12.2019 confirms the destruction of the dome #85 - photos Cenapred / CNPC / Seguridad

Popocatépetl - the overview of 23.12.2019 confirms the destruction of the dome #85 - photos Cenapred / CNPC / Seguridad

On December 25, from 4:15 am to 5:40 am, emissions of turbulent ash and glowing fragments were observed at a distance of about 800 meters. Derived from this activity, ash falls were recorded in the municipalities of Domingo Arenas, Nealtican, San Nicolás de los Ranchos and Chiautzingo, belonging to the state of Puebla. This activity was followed by gas emissions, dispersed to the northeast.

In the past 24 hours, Cenapred has also recorded 166 low-intensity exhalations and 155 minutes of tremor.

The alert level remains at Amarillo Fase 2.

 

Sources: Cenapred & webcamsdeMexico

Popocatépetl - morning activity of 25.12.2019 - webcamsdeMexico / Cenapred / CNPC / Seguridad

In Stromboli, normal activity was observed during the period from December 16 to 22, 2019, of explosive Strombolian type, accompanied by degassing and splashing activities; the hourly frequency of explosions fluctuated between average values ​​(13 events / h on December 17) and very high values ​​(32 events / h on December 20). The intensity of the explosions was mainly at a medium-low level in the area of ​​the North crater and medium-high in the area of ​​the Center-South crater.

The seismological parameters do not show significant variations.

No change to report on the deformation side.

SO2 flux is at medium-high level

The isotopic ratios of dissolved helium in the thermal layer remain unchanged at the mid-low values.

The CO2 / SO2 ratio is at a medium / high value (data not validated on 12/15/2019).

 

Source: INGV OE

 Stromboli - average daily hourly frequency of explosive activity between June 1 and December 22, 2019 - the period described is in the gray frame and the box on the right; the northern zone showed higher activity - Doc. INGV Vulcani

 Stromboli - average daily hourly frequency of explosive activity between June 1 and December 22, 2019 - the period described is in the gray frame and the box on the right; the northern zone showed higher activity - Doc. INGV Vulcani

Stromboli - Morphology of the crater zone according to the drone surveys of 09.07.2019 - Shaded relief dell'area craterica di Stromboli ottenuto tramite l'elaborazione di immagini acquisite da drone il 9 luglio 2019 (Collaborazione con il GEOMAR drone group Helmholtz Center for Ocean Research Kiel, Germany). In alto a sinistra the Isola di Stromboli, il rettangolo nero indica l'eaea di interesse, la linea curva nera e la linea rossa dentellata indicano, rispettivamente la scarpata morfologica e gli orli craterici. - Doc. INGV

Stromboli - Morphology of the crater zone according to the drone surveys of 09.07.2019 - Shaded relief dell'area craterica di Stromboli ottenuto tramite l'elaborazione di immagini acquisite da drone il 9 luglio 2019 (Collaborazione con il GEOMAR drone group Helmholtz Center for Ocean Research Kiel, Germany). In alto a sinistra the Isola di Stromboli, il rettangolo nero indica l'eaea di interesse, la linea curva nera e la linea rossa dentellata indicano, rispettivamente la scarpata morfologica e gli orli craterici. - Doc. INGV

In Etna, during the period from December 16 to 22, 2019, the activity marked the NSEC, NE and Voragine craters: of strombolian type in the New Southeast Crater - of strombolian type intra-crater with sporadic ash emissions in the north crater and at the crater of Voragine.

INGV observed a moderate increase in seismicity due to fracturing; the amplitude of the tremors fluctuated between medium and low values.

Low infrasound activity is noted.

No significant variation to report on the deformation side, but a trend towards inflation continues

SO2 fluxes are at an average level.

The CO2 flux from the soil is at average values, showing a recovery compared to last week.

The partial pressure of CO2 in the aquifer does not show significant variations.

The helium isotopic ratio values are medium-high values (last data available on December 12).

 

Source: INGV OE

Etna - photo Giuseppe Distefano 24.12.2019

Etna - photo Giuseppe Distefano 24.12.2019

Etna NSEC - photo J.Nasi / Butterfly Helicopters 16.12.2019 / 9.49 UTC

Etna NSEC - photo J.Nasi / Butterfly Helicopters 16.12.2019 / 9.49 UTC

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