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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
Piton de la Fournaise - 14.08.2019 / 21h local - the flows at the cam.therm. and the eruptive site - Doc © OVPF-IPGP.
Piton de la Fournaise - 14.08.2019 / 21h local - the flows at the cam.therm. and the eruptive site - Doc © OVPF-IPGP.

Piton de la Fournaise - 14.08.2019 / 21h local - the flows at the cam.therm. and the eruptive site - Doc © OVPF-IPGP.

The indecisions or hesitations of La Fournaise:

At the Piton de la Fournaise, the volcanological observatory recorded a stop of eruptive activity on the surface since 04:20 local August 15, 2019.

On the same day, the eruptive tremor resumed at 8:30. This was confirmed by the observations on site, the activity of lava fountains resumed within the same eruptive cone.

Aline Peltier, director of the volcanological observatory of Piton de la Fournaise (OVPF), decrypts the situation.

This is predictable because, following the eruption of the erupting tremor, seismicity was still recorded, notably a deep seismicity which showed that there were still magma circulations at depth, as well as a residual tremor on the surface. One of our seismological stations was one of the hypotheses that was not ruled out, namely the resumption of activity. "

A phenomenon already observed in 2007 and 2015

 " In 2007 and 2015 we had stops like that of eruption, from several hours to several days, before it resumed at the same eruptive site.It is not unusual even if it is not common to all the eruptions. "
 

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 11.08 and 16.08.2019 at the GPS  / Grands Pentes Sud station - (© OVPF-IPGP).

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 11.08 and 16.08.2019 at the GPS / Grands Pentes Sud station - (© OVPF-IPGP).

The eruption stopped again on August 15th, 2013 at approximately 22:00 local time, after a little more than 6 hours of activity of "gas piston" or "puffs of tremor".

The eruptive activity on the surface is currently stopped, only persistent degassing at the level of eruptive fissures and glare at the lava flows that are being cooled.

No hypothesis is discarded as to the evolution of the future situation (permanent shutdown, resumption of activity on the same site, resumption of activity elsewhere), a seismicity still being recorded under the summit of the volcano.

 

The prefect of Reunion triggers the transition to the backup phase. Access to the enclosure is forbidden.

 

Sources: OVPF

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

Popocatépetl - 15.08.2019 / 01h46 - Doc. live Tercermilenio.tv, via Skywatchers

Popocatépetl - 15.08.2019 / 01h46 - Doc. live Tercermilenio.tv, via Skywatchers

Popocatépetl - 15.08.2019 / 01h47 - Doc. WebcamsdeMexico / Popocam - one click to enlargePopocatépetl - 15.08.2019 / 01h47 - Doc. WebcamsdeMexico / Popocam - one click to enlarge

Popocatépetl - 15.08.2019 / 01h47 - Doc. WebcamsdeMexico / Popocam - one click to enlarge

In the past 24 hours, 162 exhalations have been identified using Popocatépetl volcano monitoring systems, accompanied by water vapor, gas and small amounts of ash.

In addition, 13 explosions were recorded today at 00:34, 01:00, 01:45, 01:47, 02:08, 02:27, 02:33, 03: 20, 03:39, 05: 56, 06:44, 08:10 and 08:27 h.

In addition, 711 minutes of low amplitude tremor were counted.

From August 15 in the morning to 11 am local, there are gas emissions west-northwest.

 

CENAPRED urges NOT to approach the volcano and in particular the crater, because of the risk of falling ballistic fragments (picture 6) and in case of heavy rains far from the bottom of the ravines due to the risk of mudslides and debris.

The volcanic alert of Popocatépetl is YELLOW PHASE 2.

 

Sources: Cenapred & WebcamsdeMexico

 Popocatépetl - 15.08.2019 / 8h20 - WebcamsbyMexico

 Popocatépetl - 15.08.2019 / 8h20 - WebcamsbyMexico

During the past three days, the Institute of Geophysics of Peru (IGP), through the National Center for Vulcanology (CENVUL), has recorded intense seismic activity on the Sabancaya volcano.

The first of these swarms occurred on August 12 between 04:29 and 06:32, with 102 earthquakes and a maximum magnitude of M3.2.

The second, August 13 between 04:02 and 06:02, with 139 earthquakes and a maximum magnitude of M3.5.

Finally, the third swarm took place between 19:39 yesterday and 19:24 today, with a total of 279 earthquakes and a maximum magnitude of M3.5.

Sabancaya - seismic swarms of 12-14.08.2019 (in the yellow frames) - Doc. IG Peru

Sabancaya - seismic swarms of 12-14.08.2019 (in the yellow frames) - Doc. IG Peru

" The observation of these days on the Sabancaya volcano, with hundreds of earthquakes in a few hours, would indicate that new magma contributions would be ascending towards the magma chamber of the volcano, suggesting that the eruption process of Sabancaya would still be extended, so that the increase in the number of explosions observed daily as well as emissions of ash expelled would not be excluded, "says Dr. Hernando Tavera. , executive chairman of the IGP.

 

Sources:

- IG Peru / ¿Por qué ocurren seismic stretches in volcánicas áreas? - link -14,08,2019 5:43 PM

- El Comercio

Karymsky - photo Dmitry Melnikov Via Kamchatka explorers 15.08.2019

Karymsky - photo Dmitry Melnikov Via Kamchatka explorers 15.08.2019

As mentioned earlier, Karymsky's activity on the Kamchatka peninsula was characterized by frequent explosions generating ash peaks between 3,000 and 5,000 meters.

 

Sources: KVERT, Sentinel-2 and local observers

Karymsky - situation maps - Doc KVERT & aeic.alaska.edu - One click to enlargeKarymsky - situation maps - Doc KVERT & aeic.alaska.edu - One click to enlarge

Karymsky - situation maps - Doc KVERT & aeic.alaska.edu - One click to enlarge

Karymsky - a hot spot on this image Sentinel-2 L1C image bands 12,11,4 from 13.08.2019 - One click to enlarge

Karymsky - a hot spot on this image Sentinel-2 L1C image bands 12,11,4 from 13.08.2019 - One click to enlarge

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