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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
 Tangkuban Parahu - activity in progress - photo PVMBG 02.08.2019 / 06h08

Tangkuban Parahu - activity in progress - photo PVMBG 02.08.2019 / 06h08

After erupting on July 26, 2019, Tangkuban Parahu's activity was dominated by gas and ash emissions at a height of 20-200 meters above the bottom of the main Ratu crater.

- On August 1st, at 8.46 pm WIB, the eruptive activity resumed, characterized by a plume of gray ash of 180 meters; its max amplitude imprint 50 mm (scale exceeded) was recorded for 11 minutes 23 seconds.

- On August 2 at 0:43 WIB, a new phreatic eruption occurred; the recording lasted 3 minutes 6 seconds, with a maximum amplitude of 50 mm.

The same day, other episodes were recorded at 1:45, 3:57 and 4:06 WIB, and continue.

In addition to the tremor, low local inflation and an increase in the concentration of volcanic gases are measured.

Due to the instability of the volcano, and the different parameters analyzed, the level of activity of the Tangkuban Parahu has been increased to 2 / waspada, together with a forbidden zone of 1,500 meters radius around the active crater.

 

Sources: PVMBG, Magma Indonesia, BNPB

The state of Ratu crater of Mount Tangkuban Parahu on 28.07.2019, at 15:15 WIB. - photo BNPB

The state of Ratu crater of Mount Tangkuban Parahu on 28.07.2019, at 15:15 WIB. - photo BNPB

Tangkuban Parahu - sismogramme des 01-02.08.2019 - Doc. Magma Indonesia

Tangkuban Parahu - sismogramme des 01-02.08.2019 - Doc. Magma Indonesia

The OVPF gives details on the activity of Piton de La Fournaise in its newsletter of July.

 

" The continuous inflation of the building registered following the end of the eruption of June 11-13, 2019, as well as the seismicity were the witness of a deep recharge in magma and a pressurization of the superficial magmatic reservoir. The pressurization led to the eruption of July 29-30, which only partially drained this reservoir

On 29 July2019, at 05h13 local time (01:13 UT), a seismic crisis, witnessing the rupture of the roof of the superficial magmatic reservoir (under pressure inside) and the final spread of the magma towards the surface, is recorded . In total, 1099 shallow volcano-tectonic earthquakes (<2 km deep) were recorded on 29 July. This crisis was accompanied by rapid deformations of the soil, of the order of 12-13 cm on the western edge of the crater Dolomieu.

The tremor, synonymous with the arrival of magma close to the surface, appeared around 8:00 am UT (12:00 pm local time, Figure 9) on July 29. The eruptive activity was characterized by the opening of 3 cracks on the northern flank of the volcano, 600 m from Formica Leo, on a total length of about 450 meters near the tourist trail leading visitors to the summit."

Piton de la Fournaise - the eruptive site 29.07.2019 - photo Imazpress

Piton de la Fournaise - the eruptive site 29.07.2019 - photo Imazpress

Piton de La Fournaise - thermal image of the eruptive site on July 29, 2019 at 17:30 local time (© OVPF - IPGP) - one click to enlarge

Piton de La Fournaise - thermal image of the eruptive site on July 29, 2019 at 17:30 local time (© OVPF - IPGP) - one click to enlarge

" In-situ thermal images and measurements as well as lava samples were taken by the OVPF teams on 29 July. The maximum temperature, measured at the base of the lava fountains by infrared images and at the front of the lava flows using a thermocouple, was 1100 ° C.

The surface flows estimated from the satellite data, via the HOTVOLC platforms (LMV, OPGC, University Clermont Auvergne) and MIROVA (University of Turin), were of the order of 21 m3 / s and 4.5 m3 / s in the beginning of eruption. Over the entire eruption platform HOTVOLC estimated an average flow of about 11.6 m3 / s.The eruption stopped on July 30, 1919 around 04:30 local time after less than 24 hours of activity and the installation of castings over a maximum length of about 730 m."

Overview of the eruption of the July 29-30, 2019 eruption at Piton de la Fournaise with the assistance of SAG and PGHM. / 01,08,2019 / OVPF Twitter

Overview of the eruption of the July 29-30, 2019 eruption at Piton de la Fournaise with the assistance of SAG and PGHM. / 01,08,2019 / OVPF Twitter

Overview of the eruption of the July 29-30, 2019 eruption at Piton de la Fournaise with the assistance of SAG and PGHM. / 01,08,2019 / OVPF Twitter

Overview of the eruption of the July 29-30, 2019 eruption at Piton de la Fournaise with the assistance of SAG and PGHM. / 01,08,2019 / OVPF Twitter

Source: OVPF - Monthly Bulletin - The eruption of 29-30 July 2019. http://www.ipgp.fr/sites/default/files/ovpf_20190801_bullmensu.pdf

 

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)

-the Facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/)

Stromboli - thermal anomalies on 30.07.2019 - Doc.Mirova MODIS_Latest10NTI

Stromboli - thermal anomalies on 30.07.2019 - Doc.Mirova MODIS_Latest10NTI

One month after the paroxysmal eruption that affected Stromboli, the summit activity remains strong; See article  http://www.earth-of-fire.com/2019/07/activity-of-stromboli-nevado-del-ruiz-krakatau-karangetang-and-merapi.html

A 1 August 12th Sentinel 2-band image reveals the hot spots at the top and the large area affected by the fires that followed.

 

Source: Sentinel-2 L1C and Mirova

Stromboli - image Sentinel-2 L1C image bands 12,11,4 from 01.08.2019 - one click to enlarge

Stromboli - image Sentinel-2 L1C image bands 12,11,4 from 01.08.2019 - one click to enlarge

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