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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
Stromboli - major explosion on 29.08.2019 / 22:43 local - photo LGS / Laboratorio di Geofisica Experimental University of Firenze - Dipartimento di Scienze della Terra

Stromboli - major explosion on 29.08.2019 / 22:43 local - photo LGS / Laboratorio di Geofisica Experimental University of Firenze - Dipartimento di Scienze della Terra

On 29 August 2019 at 20:43:41 UTC, the geophysical monitoring network recorded a very powerful explosive event at Stromboli , associated with geophysical parameters (seismic, ground deformation and sound pressure) that are higher than the ordinary explosive activity and can be classified as follows: Major explosion!

Explosion 29.08.2019 webcam ROC- LGS / Laboratorio di Geofisica Experimental University of Firenze - Dipartimento di Scienze della Terra

The seismic event (speed of 4.0 x 10-4 m / s and displacement of 4.5 x 10-5 m) exceeds the values ​​of ordinary activity

The infrasonic network indicates that the explosion generated pressures of about 250 Pa, at a distance of 450 m, and located the explosive event in the area in relation to the Central / SW crater.

This event was accompanied by a strong signal of soil deformation (1.17 μrad in the OHO inclinometer of Rina Grande), preceded by about 2 minutes of a net swelling of the soil.

Following the explosion, there is an increase in seismic tremor to very high values ​​and an increase in the lava flow from the crater NE crater of Sciara del fuoco.

Stromboli - Comparison between seismic amplitudes (UD) and inclination. Soil deformations indicate that today's event (star) falls largely into the domain of major explosions. The red dots indicate the values ​​for the paroxysmal events of March 15, 2007, July 3, 2019 and August 28, 2019. - Doc. LGS

Stromboli - Comparison between seismic amplitudes (UD) and inclination. Soil deformations indicate that today's event (star) falls largely into the domain of major explosions. The red dots indicate the values ​​for the paroxysmal events of March 15, 2007, July 3, 2019 and August 28, 2019. - Doc. LGS

Stromboli - weekly tremor chart

Stromboli - weekly tremor chart

Source: LGS / Laboratorio di Geofisica Experimental - University of Firenze

http://lgs.geo.unifi.it/index.php/blog/esplosione-maggiore-stromboli-29-agosto-2019

Stromboli - night activity 30.08.2019, at 02:32, 02:32 and 04:01 / Laboratorio di Geofisica Experimental & Skyline webcamsStromboli - night activity 30.08.2019, at 02:32, 02:32 and 04:01 / Laboratorio di Geofisica Experimental & Skyline webcams - one click to enlargeStromboli - night activity 30.08.2019, at 02:32, 02:32 and 04:01 / Laboratorio di Geofisica Experimental & Skyline webcamsStromboli - night activity 30.08.2019, at 02:32, 02:32 and 04:01 / Laboratorio di Geofisica Experimental & Skyline webcams - one click to enlarge
Stromboli - night activity 30.08.2019, at 02:32, 02:32 and 04:01 / Laboratorio di Geofisica Experimental & Skyline webcamsStromboli - night activity 30.08.2019, at 02:32, 02:32 and 04:01 / Laboratorio di Geofisica Experimental & Skyline webcams - one click to enlarge

Stromboli - night activity 30.08.2019, at 02:32, 02:32 and 04:01 / Laboratorio di Geofisica Experimental & Skyline webcamsStromboli - night activity 30.08.2019, at 02:32, 02:32 and 04:01 / Laboratorio di Geofisica Experimental & Skyline webcams - one click to enlarge

Following the accident suffered by two boats on 28 August during the sea advance of the pyroclastic flow, a much needed extension of the navigation area was expected ...

COMMUNICATION FROM THE MILAZZO COAST GUARD

" With regard to the latest violent paroxysmal explosive sequences that affected the Stromboli crater terrace, after hearing the assessments of the centers of scientific competence, it was decided to further extend the ban on the surface of the water. in front of the "Sciara del Fuoco".

As a result, the Chief of Milazzo's Maritime Division today issued Order No. 37/2019, which provides for the prohibition of navigation to all units in the sea-band of one nautical mile, or 1.852 meters of the coast between Punta delle Chiappe and Punta Labronzo of the island of Stromboli, in order to preserve and protect public safety and navigation."

 Milazzo, August 29, 2019

Sheveluch - ash plume of 29.08.2019 - image Himawari-8 - via Kirill Bakanov / Twitter

Sheveluch - ash plume of 29.08.2019 - image Himawari-8 - via Kirill Bakanov / Twitter

In Kamchatka, the explosive-extrusive activity of Sheveluch continues.

On August 29, 2019, a plume and cloud of ashes rose to 9,000 - 10,000 meters asl., According to images from the Himawari-8 satellite, before drifting north, then NNE, before returning south pushed by the winds at altitude.

 

Sources: KVERT & VAACTokyo

Sheveluch - volcanic ash advisory for 29 and 30.08.2019 - VAAC Tokyo
Sheveluch - volcanic ash advisory for 29 and 30.08.2019 - VAAC Tokyo

Sheveluch - volcanic ash advisory for 29 and 30.08.2019 - VAAC Tokyo

In terms of bans, we must add the one that concerns the eastern end of Reynisfjara beach, in the sid of Iceland. IMO experts expect a new landslide, after that of the week last.

The challenge is to find a way to establish barriers that are resistant to wind, currents and strong waves.

The tourist area of ​​the volcanic organ and cave is not concerned.

 

Source: Iceland Review

Reynisfjara - the eastern end of the beach in 2015 in heavy weather - photo © Bernard Duyck

Reynisfjara - the eastern end of the beach in 2015 in heavy weather - photo © Bernard Duyck

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