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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
 Anak Krakatau - cypressoid plume of 29.12.2019 / 8h59 - PVMBG webcam - Volcano YT video snapshot

Anak Krakatau - cypressoid plume of 29.12.2019 / 8h59 - PVMBG webcam - Volcano YT video snapshot

Several eruptive episodes mark the Anak Krakatau since December 29 at 5:29 local, with an imprint on the seismogram of max amplitude. 37 mm for 119 sec.

On December 30 at 7:53 am WIB, another episode was characterized by a gray ash plume at about 2,150 meters asl., Leaning towards the south.

At 1:35 pm local time the same day, another episode developed an ash plume at 1157 m asl., drifting south. Its footprint is of maximum amplitude. 44 mm, for 137 sec.

Two orange VONA have been issued by Magma Indonesia.

Currently, G. Anak Krakatau is in level II status (alert , with recommendations not to approach the crater within 2 km of the crater.

 

Source: PVMBG, Geology Agency, MEMR Krakatau Observation Post

Krakatau (Crater) Timelapse (29/12/2019)

Anak Krakatau - 30.12.2019 / 04h09 - PVMBG webcam

Anak Krakatau - 30.12.2019 / 04h09 - PVMBG webcam

Anak Krakatau - 30.12.2019 / 7:34 WIB - photo PVMBG

Anak Krakatau - 30.12.2019 / 7:34 WIB - photo PVMBG

 Anak Krakatau - Sentinel -3 OLCI custom script 30.12.2019 - Copernicus EMS

Anak Krakatau - Sentinel -3 OLCI custom script 30.12.2019 - Copernicus EMS

Anak Krakatau - - Volcanic ash advisory 30.12.2019 - Doc. VAAC Darwin IDY65280

Anak Krakatau - - Volcanic ash advisory 30.12.2019 - Doc. VAAC Darwin IDY65280

For the past week, inflation (swelling) of the base and the top of the Piton de la Fournaise building has been observed again by the deformation network of the OVPF. This resumption of building inflation is synonymous with the pressurization of a deep source located under the summit craters

In parallel, the CO2 concentrations in the far field soil (Plaine des Cafres and Plaine des Palmistes sectors) are still increasing since the end of the eruption of October 25-27. These CO2 concentrations are in agreement with a deep rise in magma.

Piton de La Fournaise 30.12.2019 - Map of the horizontal movements of the ground recorded during the last two weeks .; Illustration of the deformation over the past two months. Shown here are the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top (reference SNEG; top), at the base of the terminal cone (reference FJAG; in the middle) and in the far field (reference PRAG; below). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano; Comparison between the normalized means of raw CO2 flux data in the soil (in blue) and corrected (in red), recorded on stations located in the far field
Piton de La Fournaise 30.12.2019 - Map of the horizontal movements of the ground recorded during the last two weeks .; Illustration of the deformation over the past two months. Shown here are the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top (reference SNEG; top), at the base of the terminal cone (reference FJAG; in the middle) and in the far field (reference PRAG; below). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano; Comparison between the normalized means of raw CO2 flux data in the soil (in blue) and corrected (in red), recorded on stations located in the far fieldPiton de La Fournaise 30.12.2019 - Map of the horizontal movements of the ground recorded during the last two weeks .; Illustration of the deformation over the past two months. Shown here are the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top (reference SNEG; top), at the base of the terminal cone (reference FJAG; in the middle) and in the far field (reference PRAG; below). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano; Comparison between the normalized means of raw CO2 flux data in the soil (in blue) and corrected (in red), recorded on stations located in the far field

Piton de La Fournaise 30.12.2019 - Map of the horizontal movements of the ground recorded during the last two weeks .; Illustration of the deformation over the past two months. Shown here are the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top (reference SNEG; top), at the base of the terminal cone (reference FJAG; in the middle) and in the far field (reference PRAG; below). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano; Comparison between the normalized means of raw CO2 flux data in the soil (in blue) and corrected (in red), recorded on stations located in the far field

These two parameters (CO2 concentration and resumption of inflation) are in agreement with a pressurization of the surface magmatic reservoir (located between 1.5 and 2.5 km deep) due to its re-supply by fluids deeper magmatic.

For the moment the seismicity does not show a significant increase: only 9 superficial volcano-tectonic earthquakes were recorded in the last week (between 23 and 29 December).

Note that this process of recharging the surface reservoir can last several days to several weeks before the reservoir roof weakens and ruptures, thus giving rise to an injection of magma towards the surface and an eruption, and can also stop without giving rise to an eruption in the short term.

 

Source:
Find all the information relating to the activity of Piton de la Fournaise on the various media of the OVPF-IPGP:
- the website (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),
- the Twitter account (https://twitter.com/obsfournaise?lang=fr),
- and the facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/)

Pavlof - photo David Fee 20.07.2019 / AVO

Pavlof - photo David Fee 20.07.2019 / AVO

In the past few days, seismic activity has increased at Pavlof.

No eruptive activity or emission from the summit was observed. However, the seismic activity represents an increase compared to the background levels and the levels were raised at Yellow / advisory on December 28 / 20h43 Z.

This does not mean that an eruption is probable or imminent. However, past Pavlof breakouts have occurred with little to no warning.

 

Source: AVO

Last clear image of the Stromboli (before being covered by the clouds) on 16.12.2019 - Sentinel-2 L1C image bands 12,11,4

Last clear image of the Stromboli (before being covered by the clouds) on 16.12.2019 - Sentinel-2 L1C image bands 12,11,4

The activity of Stromboli has increased slightly in recent days.

The number of VLP earthquakes remains high, with 19.4 episodes per hour on 28.12 - 18.8 on 29.12 - and 20.4 on 30.12 (standard values: 5-12 / h.)

The amplitude of the tremor is middle, and the exit speed of the pyroclasts is around 24 m / s, average, and estimated by the images of thermal cameras. Tiltmeters do not show significant deformation.

Thermal activity remains average.

The flow of sulfur dioxide in the NE sector of the terrace fluctuates between 115 and 20 tonnes / day.

According to the L.G.S., volcanic activity is stable at an average level

 

Sources: LGS & Sentinel-2.

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