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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

volcanic activity

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Anak Krakatau - 22.08.2019 / 7:55 - webcam PVMBG

Anak Krakatau - 22.08.2019 / 7:55 - webcam PVMBG

Anak Krakatau - sismogram of 22.08.2019 / 0h-12h30 - Doc. Magma Indonesia

Anak Krakatau - sismogram of 22.08.2019 / 0h-12h30 - Doc. Magma Indonesia

An eruption occurred on 22 August 2019 at 7:55 am WIB at Anak Krakatau, accompanied by a plume at 457 meters above sea level, ± 300 m above the summit.

It was recorded on the seismogram with a maximum amplitude of 44 mm, for a minute 47 seconds.

Currently, the Gunung Anak Krakatau is at Level II / waspada, with recommendations: people / tourists are not allowed to approach the crater within 2 km of the crater.

 

Sources: PVMBG, Magma Indonesia and Vaac Darwin

Anak Krakatau degassing this 22.08.2019, respectively at 6:19 am (before eruption) and 8:25 am WIB (after eruption) - webcam PVMBG
Anak Krakatau degassing this 22.08.2019, respectively at 6:19 am (before eruption) and 8:25 am WIB (after eruption) - webcam PVMBG

Anak Krakatau degassing this 22.08.2019, respectively at 6:19 am (before eruption) and 8:25 am WIB (after eruption) - webcam PVMBG

Anak Krakatau - volcanic ash advisory of 22.08.2019 - Doc. VAAC Darwin IDY65305

Anak Krakatau - volcanic ash advisory of 22.08.2019 - Doc. VAAC Darwin IDY65305

In Kamchatka, the activity of Karymsky is maintained this month of August.

On 21 August around 15:50 UTC, explosions generated ash rising to more than 6,000 meters, then drifting towards the SSO.

A plume front has decreased to 4.000-4.500 meters asl.

The activity then decreased.

On August 22nd, KVERT reported a cloud of ash 486 km to the SSO.

 

Sources: KVERT 1 VAAC Tokyo

 Karymsky - activity of 15.08.2019 - photo Dmitry Melnikov Via Facebook / https://www.facebook.com/dmitry.melnikov.906

 Karymsky - activity of 15.08.2019 - photo Dmitry Melnikov Via Facebook / https://www.facebook.com/dmitry.melnikov.906

Clarification was provided by IMO regarding the landslide that affected Reynisfjara on 21 August 2019 between 19 and 19.30.

Most of the materials that compose it come from a height range of 60 to 100 meters. Wide of about 100 meters, the scree traveled about fifty meters from the cliff to the sea, and cover an area of ​​4.200m². The estimated volume is 25,000 m³, with large rocks up to 3 meters in diameter and the average slip thickness is about 5 meters (max 20 meters).

Small collapses continue, and the Civil Defense closed the access to the beach until Friday, when the situation will be reassessed.

Over the past 10 years, landslides have occurred three times, which can pose a threat to tourists. There are also falling rocks that can cause accidents on the slope at regular intervals.

 

Source: IMO in IcelandiC

Reynisfjara / Iceland - different landslides and collapses marking the cliff in the last 10 years - Doc. IMO 20.08.2019 / on picture of Björn Ingi Jónsson

Reynisfjara / Iceland - different landslides and collapses marking the cliff in the last 10 years - Doc. IMO 20.08.2019 / on picture of Björn Ingi Jónsson

Reynisfjara - site of the landslide in 2015, in a very bad weather - photo © Bernard Duyck 2015

Reynisfjara - site of the landslide in 2015, in a very bad weather - photo © Bernard Duyck 2015

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Kadovar - hot spot and plume of ash and gas - image Sentinel-2 L1C bands 12,11,4 of 18.08.2019

Kadovar - hot spot and plume of ash and gas - image Sentinel-2 L1C bands 12,11,4 of 18.08.2019

The Darwin Vaac reports small explosions with ash emissions on Kadovar in Papua New Guinea, at flight altitude 50; they should dissipate within 6 hours.

VA ADVISORY
DTG: 20190818 / 2230Z
VAAC: DARWIN
VOLCANO: KADOVAR 251002
PSN: S0338 E14438
AREA: PAPUA NEW GUINEA
SUMMIT ELEV: 365M
ADVISORY NR: 2019/22
INFO SOURCE: HIMAWARI-8
AVIATION COLOR CODE: ORANGE
ERUPTION DETAILS: DISCRETE TRANSMISSION OBS TO FL050 ON 18 / 2100Z
MOV NW

Sources: VAAC Darwin and Sentinel-2

Manam - images Sentinel 2 bands 12,11,4 / respectively 13.08.2019 (top) and 18.08.2019 (bottom) - one click to enlarge
Manam - images Sentinel 2 bands 12,11,4 / respectively 13.08.2019 (top) and 18.08.2019 (bottom) - one click to enlarge

Manam - images Sentinel 2 bands 12,11,4 / respectively 13.08.2019 (top) and 18.08.2019 (bottom) - one click to enlarge

Also in Papua New Guinea, Manam's activity is characterized in recent days by small plumes of ash and plumes of gas towards the NNW.

A small thermal anomaly is reported on 12.08 by Mirova (5-6 MW)

 

Sources: Sentinel 2 and Mirova

 Stromboli - effusive activity  on 08.08.2019 / 08h17 GST thermal camera from Punta dei Corvi - Doc. LGS

 Stromboli - effusive activity  on 08.08.2019 / 08h17 GST thermal camera from Punta dei Corvi - Doc. LGS

Stromboli - explosion on 18.08.2019 / 1:15 pm - webcam INGV

Stromboli - explosion on 18.08.2019 / 1:15 pm - webcam INGV

From 18 August at 0h35 UTC, the thermal camera of Punta Dei Corvi / on Stromboli, shows the resumption of effusive activity by a probably ephemeral vent at altitude 550-600 meters, above the area of ​​the central crater . The products issued roll along the Sciara del Fuoco.

A Modis image at 1:50 UTC records a thermal anomaly of 125 MW to 148 MW, compatible with this activity.

The explosive activity continues without significant modification.

 

Sources: INGVvulcani and Laboratorio Geofisico Sperimentale / LGS

Stromboli - thermal anomalies on 18.08.2019 / 12h55 - Doc.Mirova_MODIS_Latest10NTI

Stromboli - thermal anomalies on 18.08.2019 / 12h55 - Doc.Mirova_MODIS_Latest10NTI

A small emission of ash has been reported for a few days at Asosan, on the Japanese island of Kyushu.

On August 19th, black and fluffy ashes accumulate little by little, in the absence of precipitation.

Sources: VAAC Tokyo - photos of Taro Shimuna

Asosan - ash emissions on 19.08.2019 - photos Taro shinmura / Twitter
Asosan - ash emissions on 19.08.2019 - photos Taro shinmura / Twitter

Asosan - ash emissions on 19.08.2019 - photos Taro shinmura / Twitter

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Tangkuban Parahu - 17.08.2019 - ash and gas plume - photo BPBD / Nyi Mas Sagara Manik

Tangkuban Parahu - 17.08.2019 - ash and gas plume - photo BPBD / Nyi Mas Sagara Manik

Tangkuban Parahu - 17.08.2019 - ash and gas plume - photo BPBD / Nyi Mas Sagara Manik

Tangkuban Parahu - 17.08.2019 - ash and gas plume - photo BPBD / Nyi Mas Sagara Manik

The Tangkuban Parahu volcano (West Java), in activity level 2, since its eruptions of July 26, 2019, and August 1 and 2, maintains emissions characterized by a white to gray plume 180 meters from the bottom of the crater. The crater Rahu produces ashes about fifty meters from the bottom of the crater.

It is advisable not to approach within 1,500 meters of the active crater, and recommended to temporarily close the Tangkuban Parahu Natural Park at a greater safety distance.

Continuous tremor of dominant amplitude at 40 mm is perceived.

 

Source: BPBD

Karangetang - 18.08.2019 / 4:38 WITA - south crater flows to the NW flank - TD team photo via Andi Ewu

Karangetang - 18.08.2019 / 4:38 WITA - south crater flows to the NW flank - TD team photo via Andi Ewu

In Karangetang, eruptive period since November 25, 2018, the observation of incandescent projections 100 meters above the south crater, and flows over 1,000 to 1,500 meters towards the north-west flank, are coupled to a hot spot at North crater. Mirova reports thermal anomalies on 16 and 17 August of 68-69 MW.

The PVMBG informs for August 17, 2019, 105 eruptive earthquakes, 9 earthquakes of blast, 3 hybrid earthquakes, a volcanic earthquake and continuous tremor of dominant amplitude to 2 mm.

 

Sources: PVMBG, Sentinel-2 and Mirova

Karangetang - thermal anomalies on August 12, 2019 - Doc.Mirova

Karangetang - thermal anomalies on August 12, 2019 - Doc.Mirova

Karangetang - NO flows and hot spots at 2 craters - image Sentinel-2 L1C bands 12,11,4 of 12.085.2019 - one click to enlarge

Karangetang - NO flows and hot spots at 2 craters - image Sentinel-2 L1C bands 12,11,4 of 12.085.2019 - one click to enlarge

Rare news from African volcanoes: Erta Ale and Ol Doinyo Lengai.

At Erta Ale, Sentinel-2 images show that thermal anomalies in the far field have disappeared.

On August 17, large lava flows are visible about 3.5 km southeast of the caldera, which has a larger hot spot at the lava lake.

 

Source: Sentinel-2 and Mirova

 Erta Ale - image Sentinel-2 L1C bands 12,11,4 from 17.08.2019 - lava effusions to the SE of the caldera and hot spot to the lava lake - one click to enlarge

 Erta Ale - image Sentinel-2 L1C bands 12,11,4 from 17.08.2019 - lava effusions to the SE of the caldera and hot spot to the lava lake - one click to enlarge

Erta Ale - thermal anomaly on 13.08.2019 - Doc. Miraova_MODIS_Latest10NTI

Erta Ale - thermal anomaly on 13.08.2019 - Doc. Miraova_MODIS_Latest10NTI

In Lengai, after months of planning and administrative procedures (various permits to be obtained) Kate Laxton, a PhD student, has achieved the feat of collecting from the edge of the crater samples of natrocarbonatite lava ... the first collected since the explosive eruption from 2007.

The samples will be analyzed in relation to British universities.

 

Source: Kate Laxton / Twitter

Ol Doinyo Lengai - sampling of lava natrocarbonatite in the crater of the volcano - photos Kate Laxton 17.08.2019 / Twitter
Ol Doinyo Lengai - sampling of lava natrocarbonatite in the crater of the volcano - photos Kate Laxton 17.08.2019 / Twitter

Ol Doinyo Lengai - sampling of lava natrocarbonatite in the crater of the volcano - photos Kate Laxton 17.08.2019 / Twitter

Ol Doinyo Lengai - successful sampling: black lava is recovered - photo Kate Laxton / Twitter 15.08.2019

Ol Doinyo Lengai - successful sampling: black lava is recovered - photo Kate Laxton / Twitter 15.08.2019

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Nevados of Chillan - explosion the 16.08.2019 / 06h23 - webcam Sernageomin

Nevados of Chillan - explosion the 16.08.2019 / 06h23 - webcam Sernageomin

Several explosions were reported at Nevados de Chillan on August 16, including one around 6.30am and another at 12pm local. The latter has been associated with an LP earthquake in relation to the dynamics of internal fluids.

The technical alert level is orange and a map of potential risks has been updated by the Onemi.

 

Sources: Sernageomin & Onemi.

Nevados de Chillan - map of potential risks, review su 16.08.2019 - Doc. Onemi Chile

Nevados de Chillan - map of potential risks, review su 16.08.2019 - Doc. Onemi Chile

At the Piton de la Fournaise, since the eruption stopped on 15/08/2019 at approximately 22h local time, 9 volcano-tectonic earthquakes have been recorded. These earthquakes are located under the summit zone.

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04:00 (00:00 UTC) on August 11 and 14:30 (10:30 UTC) on August 16, 2019 on the GPS seismic station, station the closest to the eruptive site (© OVPF-IPGP).

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04:00 (00:00 UTC) on August 11 and 14:30 (10:30 UTC) on August 16, 2019 on the GPS seismic station, station the closest to the eruptive site (© OVPF-IPGP).

The deformations recorded by the OVPF measuring devices on the ground do not show any noticeable signals since the end of the eruption.

It should be noted that the deformation field associated with the eruption of 11-15 August 2019 did not extend outside the Enclos Fouqué (dated 15/08/2019 17h47, date of the satellite acquisition according to the Sentinel-1 / ESA satellite InSAR interferogram, which shows that the dike ("feed duct") feeding the eruption did not propagate beyond this structure.

Piton de La Fournaise - Interferogram representing the deformations at Piton de la Fournaise associated with the eruption of August 11-15, 2019 (© OVPF-IPGP). In addition to ground measurements, the OVPF also uses a satellite technique called InSAR to monitor building inflation / deflation cycles associated with deep magma movement. For this, the satellite "illuminates" an area of ​​the ground with an electromagnetic wave and collects the signal reflected from the ground. The comparison of two measurements of this type of the same surface taken at different times makes it possible to image the deformations of the surface. The above interferogram shows the deformation of the surface associated with the eruption of August 11-15, 2019. Each color cycle (from red to blue) complete of the interferogram corresponds to 27.8 mm of displacement of the surface to (positive) or opposite (negative) Sentinel-1 satellite (whose direction is represented by the arrow "LOS" at the top right of the figure).

Piton de La Fournaise - Interferogram representing the deformations at Piton de la Fournaise associated with the eruption of August 11-15, 2019 (© OVPF-IPGP). In addition to ground measurements, the OVPF also uses a satellite technique called InSAR to monitor building inflation / deflation cycles associated with deep magma movement. For this, the satellite "illuminates" an area of ​​the ground with an electromagnetic wave and collects the signal reflected from the ground. The comparison of two measurements of this type of the same surface taken at different times makes it possible to image the deformations of the surface. The above interferogram shows the deformation of the surface associated with the eruption of August 11-15, 2019. Each color cycle (from red to blue) complete of the interferogram corresponds to 27.8 mm of displacement of the surface to (positive) or opposite (negative) Sentinel-1 satellite (whose direction is represented by the arrow "LOS" at the top right of the figure).

Source : 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/)

Pieces of pumices encountered by the catamaran ROAM on 15.08.2019 / 19h local - photo ROAM Facebook

Pieces of pumices encountered by the catamaran ROAM on 15.08.2019 / 19h local - photo ROAM Facebook

Pumice blocks of various sizes, but up to that of a basketball, were spotted by the ROAM Catamaran, en route from Bora Bora to the Fiji Islands (at coordinates 18 55 'S / 175 21'W August 15th at 19h local.

These rafts were also spotted on Terra Modis images on August 8 and Sentinel-2 on August 11, 2019.

Based on images of pumice rafts, the Global volcanism Program attributes these pumices to an eruption of an underwater volcano, listed under Vnum 243091, known but unnamed, located along the Tofua volcanic arc, presumably around from 5-6 August. Its last eruption was on September 27-28, 2001 (http://volcano.si.edu/showreport.cfm?doi=10.5479/si.GVP.BGVN200705-243091)

 

Sources: Global Volcanism Program, ROAM facebook & twitter, Simon Carn

Pumice rafts in the Pacific - images Sentinel-2 / Copernicus from 11.08.2019 / via Simon Carn
Pumice rafts in the Pacific - images Sentinel-2 / Copernicus from 11.08.2019 / via Simon Carn

Pumice rafts in the Pacific - images Sentinel-2 / Copernicus from 11.08.2019 / via Simon Carn

Popocatépetl shows intense activity in recent days: during the last 24 hours, 188 exhalations, accompanied by water vapor, gas and low quantities of ash, five minor explosions (4 on the 15th between 10h and 12h, and one the 16.08 to 8.40) and two moderate explosions (16.08 to 9.08 and 9:51) were counted. At the seismicity level, 790 minutes of tremor and a volcano-tectonic earthquake were recorded.

The volcanic alert remains in Amarillo fase 2, with a 12 km safety zone, recently violated by a group that descended into the crater.

 

Source: Cenapred

Popocatépetl 16.08.2019 / 7h16 - despite the danger, the volcano can present poetic images at sunrise, with the Moon and ashes exhaled a few moments before - webcamsdeMexico

Popocatépetl 16.08.2019 / 7h16 - despite the danger, the volcano can present poetic images at sunrise, with the Moon and ashes exhaled a few moments before - webcamsdeMexico

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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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Publié le par Bernard Duyck
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The eruption started on August 11, 2019 around 16:20 (local time) at Piton de La Fournaise continues on August 14th. Despite rapid fluctuations, the intensity of the eruptive tremor (witnessing the intensity of the eruption) is relatively constant over the last 18 hours.

Activity of La Fournaise, Karymsky and Stromboli.

Since the beginning of the eruption, 63 volcano-tectonic earthquakes have been recorded:
- 31 August 11 from 17h to 24h.
- 7 August 12 from 00h to 24h.
- 6 August 13 from 00h to 24h.
- 19 August 14 from 00h to 24h.

4th day of eruption at Piton de la Fournaise - Uploaded by IMAZPRESS Réunion on 2019-08-14.

Because of the small inclination of the slopes in the area reached by the lava front on 13/08/2019, its progression is very slow, and the front is still located between 600-650 m altitude, a highly vegetated area ( near the Piton Tremblet), about 2 km from the road

Estimated surface flows from satellite data via HOTVOLC platforms (OPGC - University of Auvergne) and MIROVA (University of Turin) were around 2 m³ / s over the last 24 hours. This flow rate corresponds to a minimum flow, because the bad weather conditions on the volcano since the beginning of the eruption attenuate the satellite signals.

Piton de La Fournaise - Location of the eruptive fissures that opened on the 11/08/2019 and the approximate contours of associated lava flows. (© OVPF-IPGP / OPGC-LMV 14.08.2019).

Piton de La Fournaise - Location of the eruptive fissures that opened on the 11/08/2019 and the approximate contours of associated lava flows. (© OVPF-IPGP / OPGC-LMV 14.08.2019).

As the volcanologist Ludovic Leduc explains: " the most advanced front is no longer active ... the front stopped during the day around 600 m altitude, at the level of Pitons Tremblet (flow of April 2007). It is related to two main factors: the arrival of the lava in a less sloping littoral band, and the decrease of the flow ... when the flow decreases, the lava front ends up being no longer fed. It then solidifies, forcing the flow of lava behind (because there is still lava to arrive, but a little less) to take another path ... This forms a new flow that must start from higher ... A term, this builds what is called a lava field."- by Objectif Volcans

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) on August 15th on the seismic station NTR / Nez du Tremblet - Doc. OVPF

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) on August 15th on the seismic station NTR / Nez du Tremblet - Doc. OVPF

The eruption started on 11/08/2019 at 16:20 local time stopped today, the 15/08/2019 at around 04:20 local time.

The surface eruptive activity is currently stopped, the lava is no longer at the surface and the fountains have dried up ... only one remains degassing at the level of eruptive fissures and glare at the level of the lava flows which are during cooling.

No assumption is discounted as to the evolution of the future situation (final shutdown, resumption of activity on the same site, resumption of activity elsewhere), taking into account the following observables:

- a residual tremor is still recorded on the NTR station, located on the Nez Coupé du Tremblet.

- recording deep earthquakes that indicate that deep magma movements are still present.

So, Stop or resumption ?
 

In any case, La Fournaise will have " thrown more in the eyes "  with this 4th eruption 2019 !

 

Update 8.30am:
Resumption of eruptive activity at Piton de la Fournaise after a little over 4h break. Following the eruption stopped this morning at 4:20 am, the eruptive tremor resumed at 8:30. The activity of lava fountains resumed within the same eruptive cone.

In any case, La Fournaise will have thrown more eyes with this 4th eruption 2019! - photo RB / Imaz Press Reunion

In any case, La Fournaise will have thrown more eyes with this 4th eruption 2019! - photo RB / Imaz Press Reunion

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/)

- Ludovic Leduc / Objectif Volcans

Karymsky - during an overview on 23.07.2019 - photo Olga Girina / IVS FEB RAS, KVERT

Karymsky - during an overview on 23.07.2019 - photo Olga Girina / IVS FEB RAS, KVERT

In Kamchatka, Karymsky presented on August 14 ash expolosins, accompanied by plume at 4,000-4,500 meters asl., then drifting to the south-west.

Moderate activity continues, and ashes are still observed by the Himawari-8 satellite on August 15 at 03h 00Z

The aviation code is orange.

 

Sources: KVERT, KSCNET & VAAC Tokyo

Karymsky - Volcanic ash advisory 15.08.2019 - Doc. VAAC Tokyo

Karymsky - Volcanic ash advisory 15.08.2019 - Doc. VAAC Tokyo

The activity of Stromboli during the week of August 5th to 11th has just been described in the INGV weekly bulletin.

In short, Strombolian explosive activity is characterized by an average of 19 to 22 hourly explosions (high average) and lava overflow.

It concerns two sectors: the northern sector, where at least 9 vents are active, 3 of which form well-defined slag cones with weak to medium strombolian activity; the south-central sector, which has a large cone of slag that emits explosions rich in ash.

Stromboli - north sector (left) with 9 active vents - south-central sector (right) with a large cone of slag - photo INGV

Stromboli - north sector (left) with 9 active vents - south-central sector (right) with a large cone of slag - photo INGV

The effusive activity by overflow of the south-central crateric terrace remained limited to the upper part of the Sciara del Fuoco.

Seismicity does not show significant variations, and there are no significant variations in deformation.

 

Regular Strombolian activity of ordinary intensity and discontinuous spattering are expected later, without being able to exclude explosions or stronger lava emissions.

 

Source: INGV Weekly Newsletter

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Publié le par Bernard Duyck
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Piton de La Fournaise - lava flow in the Grand Brûlé - photos © Thierry Sluys 13.08.201
Piton de La Fournaise - lava flow in the Grand Brûlé - photos © Thierry Sluys 13.08.201

Piton de La Fournaise - lava flow in the Grand Brûlé - photos © Thierry Sluys 13.08.201

At Piton de La Fournaise, an aerial survey was carried out on Tuesday August 13 with the help of SAG and PGHM. In total there are two eruptive cracks, distant from each other of about 1400 m, which opened on August 11, 2019 in the eastern sector, southeast of the upper part of the Great Slopes at 1700 and 1500 m altitude.
Around 09:30 (local time), only the lowest altitude fissure was active, on which three separate cones formed by accumulation of lava fountains spaterring.
A fumarole zone, not related to an eruptive crack or a lava flow, was observed between the two cracks at about 1100 m altitude.

Piton de La Fournaise - location of cracks - Doc. OVPF

Piton de La Fournaise - location of cracks - Doc. OVPF

Piton de la Fournaise - crack 1 opened on 11.08.2019 at 1700 m altitude but no longer active. - OVPF photo 13.08.2019

Piton de la Fournaise - crack 1 opened on 11.08.2019 at 1700 m altitude but no longer active. - OVPF photo 13.08.2019

The three active flows from these cones meet in a single channel whose front was this morning at 09:30 to 665 m altitude (near the Piton Tremblet), about 2.1 km from the road.

Small fires were observed all along the lower part of the stream, due to its entry into a highly vegetated area.

Piton de La Fournaise - the flows slow down when arriving in the vegetation, and cause fires - photo © Thierry Sluys 13.08.2019

Piton de La Fournaise - the flows slow down when arriving in the vegetation, and cause fires - photo © Thierry Sluys 13.08.2019

Piton de La Fournaise - the lava plays hide-and-seek with the mist - - photo © Thierry Sluys 13.08.2019

Piton de La Fournaise - the lava plays hide-and-seek with the mist - - photo © Thierry Sluys 13.08.2019

Piton de La Fournaise - a thinning reveals the active crack, and the cones of projections - photo © Thierry Sluys 13.08.2019

Piton de La Fournaise - a thinning reveals the active crack, and the cones of projections - photo © Thierry Sluys 13.08.2019

Piton de La Fournaise - the eruption seen from the RN2 and the Grand Brûlé - Doc. Imazpress 13.08.2019

The weather remains capricious during the day on the side of lava road. The weather oscillates between cloudy and clouds ... to see the lava in the Great slopes is random.

This did not prevent the curious from coming and coming back ... traffic jams formed in the evening on Saint-Philippe side and Sainte-Rose side.

 

Sources:

- Thanks to Thierry Sluys, for sharing photos.

- OVPF newsletters and tweets

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/)

- Local media

Ubinas - Period of analysis: 6-12 August 2019 - Doc. IG Peru

Ubinas - Period of analysis: 6-12 August 2019 - Doc. IG Peru

The Geophysical Institute of Peru (IGP) reports that the Ubinas volcano continues its eruptive process. To date, the decrease in seismic activity that would be related to the rise of magma is recorded; however, bluish gas (magmatic gas) and water vapor emissions observed by surveillance cameras continue to be recorded. Moreover, thanks to the satellites, thermal anomalies have been detected which indicate the proximity of the magma to the surface of the crater. Even in this scenario, an explosive activity would be expected in the coming days.

Prospects according to IG Peru:

The increase in volcanic activity is expected in the coming days, with the development of explosions with the expulsion of ballistic bombs and  ash emissions, similar or lower in height and volume than those observed on July 19. The probability of debris avalanche due to the collapse of the south wall of the volcanic building is latent.

The technical alert level remains orange.

 

Source: I.G.Peru - Period of analysis: 6-12 August 2019

Sabancaya - activity between 5 and 11.08.2019 - Doc. IG Peru

Sabancaya - activity between 5 and 11.08.2019 - Doc. IG Peru

At Sabancaya, the eruptive activity of the week from 5 to 11 August is at a moderate level, with an average of 30 explosions per day, accompanied by ash plumes up to 4,000 meters above sea level.

The seismicity is marked by 2,227 earthquakes during this period, and 9 thermal anomalies between 3 and 49 MW.

The activity remains in the framework of the orange technical alert, with a non-accessible area of ​​12 km radius around the volcano.

 

Source: I.G.Peru / CENVUL

Nevados of Chillan - 13.08.2019 / 16:03 webcam OVDAS Porterzuelo

Nevados of Chillan - 13.08.2019 / 16:03 webcam OVDAS Porterzuelo

The Sernageomin / OVDAS reports several explosions at Nevados de Chillan on August 13, respectively at 4:27 local time, 10:58 and 11:16 LT, associated with LP earthquakes, in relation to the dynamics of internal fluids; Incandescence associated with the gases and pyroclastic materials emitted in the vicinity of the crater was observed.

On August 14, two explosions are reported at 0h local time and 2h29 local time, associated with LP earthquakes.

This activity is part of the Orange Volcanic Technical Alert.

 

Source: Sernageomin

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Publié le par Bernard Duyck
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The eruption started on August 11, 2019 around 16:20 (local time) at Piton de La Fournaise continues. The intensity of the eruptive tremor (witnessing the intensity of the eruption) is relatively constant since 8:00 am local time (04:00 UT).

Due to poor weather conditions since the start of the eruption, no reconnaissance could be done on site.

The glow observed from RN2 in the Grand Brûlé and the few observations of this night and today confirm that the crack(s) opened on the east flank, south-east inside the Enclos Fouqué, in the upper part of the Great Slopes, as the tremor maps show since the beginning of the eruption.

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04:00 (00:00 UT) on August 11 and 16:00 (12:00 UT) on August 12, 2019 on the GPS seismic station, station the closest to the eruptive site (© OVPF-IPGP).

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04:00 (00:00 UT) on August 11 and 16:00 (12:00 UT) on August 12, 2019 on the GPS seismic station, station the closest to the eruptive site (© OVPF-IPGP).

Eruption hidden by the clouds, Nicolas Villeneuve explains / Imazpress 12.08.2019

Piton de La Fournaise - a gap in the clouds can see the lava flow towards the RN2 12.08.2019 in the evening - photo OVPF

Piton de La Fournaise - a gap in the clouds can see the lava flow towards the RN2 12.08.2019 in the evening - photo OVPF

At 15:00 local time, a gap in the cloud cover allowed to see the lava front from RN2; it had reached an altitude of about 1000 m (± 200 m, given the uncertainties associated with remote observations).

Around 17:10 UTC, the situation is clear: there is not one but two lava flows that are active in the Great Slopes. The first, the most north, comes from the crack opened yesterday ... but it seems to be no longer fed ...

But the eruption continues a little further south, on a new crack that seems to have opened about 1 km from the previous one and about 1.5 km from the ramparts of the Tremblet. Located near the crater of Bonnet ( eruption 1976), at 1500 m altitude, this crack feeds a lava flow that goes down fairly quickly.

Piton de La Fournaise - on the night of August 12 - photo Linfore

Piton de La Fournaise - on the night of August 12 - photo Linfore

An overflight of the eruptive site on August 12 at 9:15 found that only the lowest elevation crack (1500 m) was active and fed a flow whose front was at 665 m altitude, or 2.1 km from the road.

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/)

- Local media

Piton de La Fournaise - 13.08.2019 - the eruptive site near the rampart of Tremblet - photo OVPF

Piton de La Fournaise - 13.08.2019 - the eruptive site near the rampart of Tremblet - photo OVPF

Piton de La Fournaise - 13.08.2019 - the lava flow towards the RN2 - photo OVPF
Piton de La Fournaise - 13.08.2019 - the lava flow towards the RN2 - photo OVPF

Piton de La Fournaise - 13.08.2019 - the lava flow towards the RN2 - photo OVPF

At Santiaguito / Guatemala, a white degassing overcomes the cone and disperses to the southwest; 2 to 4 weak to moderate explosions are recorded per hour, accompanied by ash plumes at 3,200 meters asl.
These volcanic ash and outgassing columns are dispersed to the southwest and are also characterized by a low ash drop on the volcanic perimeter, generating low and moderate avalanches along the eastern flank that cause the displacement of materials. on his way.

 

Sources: Insivumeh & Conred

Santiaguito - plume of 12.08.2019 - photo Conred newsletter info 2682019

Santiaguito - plume of 12.08.2019 - photo Conred newsletter info 2682019

In Chile, the POVI reported on August 12 a collapse of a segment of the eastern edge of the crater of Villarica under the weight of snow, based on zenith images of Sentinel / Copernicus, and images from the ground.
It further informs, as seen in the two upper images, that the diameter of the heat surface at the bottom of the crater / lava lake has halved between 9 and 12 August (Sentinel SWIR images processed).

 

Sources: POVI & Copernicus / ESA

Villarica - evolution of the crater rim and the diameter of the lava lake between 9th and 12th August 2019 (photos from the top / Sentinel Copernicus) - traces of the collapse (bottom photo, red arrow) - Doc.POVI

Villarica - evolution of the crater rim and the diameter of the lava lake between 9th and 12th August 2019 (photos from the top / Sentinel Copernicus) - traces of the collapse (bottom photo, red arrow) - Doc.POVI

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The Piton de La Fournaise erupted yesterday around 16:30 ... but because of a very high cloud cover and rains, only a weak glow could be observed from the RN2, at the level of the lava flow of 2007, either at SSE in the Great Slopes. The weather does not look better on Monday. Patience, then!

Source: OVPF.

Piton de la Fournaise - faint glow of eruption on 11.08.2019 / 15:30 UT - on the camera Cascades / OVPF

Piton de la Fournaise - faint glow of eruption on 11.08.2019 / 15:30 UT - on the camera Cascades / OVPF

Images of the summit of the Nevados de Chillan complex and the Nicanor crater were captured by a member of the Volcanologia Chile team, thanks to a drone piloted by Nicolas Luengo, by a situation outside the exclusion zone, currently in a radius 3 km around the crater in activity

The lava dome inside the Nicanor Crater shows obvious signs of destruction as a result of explosive activity, which has generated a ring / or crater of explosion around it. The ring would correspond to the upper limits of what was the dome before larger explosions like the one that happened on 04/08. During these explosions, there is a partial collapse of the dome which has emitted fragments towards the N-NE flank by pyroclastic flows.

These, when they fall on the snow / ice cover, form flows called "mixed avalanches", such as those documented on 04/08.

The magma continues to reach the surface and the gases it contains are constantly emitted into the atmosphere, escaping at high pressure, producing whitish eruptive columns.

 

Source: Volcanologia Chile / N.Luengo via Twitter

Nevados de Chillan - new appearance of the crater Nicanor and the upper flanks dotted with blocks - photos by drone of Nicolas Luengo / Volcanologia Chile 11.08.2019

Nevados de Chillan - new appearance of the crater Nicanor and the upper flanks dotted with blocks - photos by drone of Nicolas Luengo / Volcanologia Chile 11.08.2019

Nevados de Chillan - mixed avalanche - photos by drone of Nicolas Luengo / Volcanologia Chile 11.08.2019

Nevados de Chillan - mixed avalanche - photos by drone of Nicolas Luengo / Volcanologia Chile 11.08.2019

Nevados de Chillan - intense degassing - photos by drone of Nicolas Luengo / Volcanologia Chile 11.08.2019

Nevados de Chillan - intense degassing - photos by drone of Nicolas Luengo / Volcanologia Chile 11.08.2019

Some recent images of Anak Krakatau, kindly shared by our friend Jean-Michel Mestdagh, on the volcano on August 10, with his wife and Igan S. Sutawijaya (former PVMBG).

He was able to make an incursion on the beach around the lake, colored from brown to black, with parts covered with sulfur. The lake, with greyish tints, had convective cells and an aggressive degassing; it is surrounded by fine ash slopes and gullies.

The activity of the gases under the sea level remains present, considering the discoloration of the waters near the shore.

 

Sources: J-M. Mesdagh & Sentinel 2

On the Anak Krakatau - photos © Jean-Michel Mestdagh 10.08.2019
On the Anak Krakatau - photos © Jean-Michel Mestdagh 10.08.2019
On the Anak Krakatau - photos © Jean-Michel Mestdagh 10.08.2019

On the Anak Krakatau - photos © Jean-Michel Mestdagh 10.08.2019

Anak Krakatau - discoloration of costal waters and convection cells on the lake - image Sentinel-2 L1C nat. colors of 11.08.2019 - one click to enlarge

Anak Krakatau - discoloration of costal waters and convection cells on the lake - image Sentinel-2 L1C nat. colors of 11.08.2019 - one click to enlarge

In central Java, the Gunung Merapi, in activity level 2, continues in the usual way, characterized yesterday by a plume at about twenty meters max. above the summit, and a fall of incandescent blocks about 500-800 meters towards Kali Gendol.

 

Source: PVMBG

Merapi - incandescent block falls this 12.08.2019 / 04h29 - via Merapi news

Merapi - incandescent block falls this 12.08.2019 / 04h29 - via Merapi news

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Piton de La Fournaise - image Sentinel-2 L1C image bands 12,11,4 from 10.08.2019 - one click to enlarge

Piton de La Fournaise - image Sentinel-2 L1C image bands 12,11,4 from 10.08.2019 - one click to enlarge

Since 07:00 local time, a seismic crisis is recorded on the instruments of the Volcanological Observatory of Piton de la Fournaise. This seismic crisis is accompanied by rapid deformation. This indicates that the magma is leaving the magma reservoir and is spreading to the surface.

Between 7:00 and 15:00 local time 1162 volcano-tectonic earthquakes were recorded by the OVPF network.

Piton de La Fournaise - Histogram of volcano-tectonic earthquakes under the volcano recorded on August 11, 2019 between 00h and 11h UTC time (15h local time). (© OVPF / IPGP)

Piton de La Fournaise - Histogram of volcano-tectonic earthquakes under the volcano recorded on August 11, 2019 between 00h and 11h UTC time (15h local time). (© OVPF / IPGP)

After 9:30 of seismic crisis, the volcanic tremor, synonymous with the arrival of the magma close to the surface, is registered since 16h20 local env. on the instruments of the OVPF / IPGP

The deformations and the seismicity show that the magma has spread deep from the southeastern edge of Dolomieu crater towards the east flank, southeast.

At present (4:00 pm local time), the spread continues in this direction.

The source of this tremor is located on the eastern flank, southeast, inside the Enclos Fouqué, in the sector of the Great Slopes / les Grandes Pentes.

Piton de La Fournaise - Variations of slope (in microradians) recorded on the summit inclinometer network of the OVPF between August 10th and August 11th 10am (UTC time, 14h local time) 2019. The direction taken by the deep magma is indicated by the arrow. The colored bar represents the time in the last 36 hours. The white circle indicates the approximate location of the pressure source at depth to explain the slope variations recorded at the beginning of the crisis (white arrows). The black circle indicates the approximate location of the pressure source at depth to explain the slope variations recorded around 13h-14h (black arrows). (© OVPF / IPGP)

Piton de La Fournaise - Variations of slope (in microradians) recorded on the summit inclinometer network of the OVPF between August 10th and August 11th 10am (UTC time, 14h local time) 2019. The direction taken by the deep magma is indicated by the arrow. The colored bar represents the time in the last 36 hours. The white circle indicates the approximate location of the pressure source at depth to explain the slope variations recorded at the beginning of the crisis (white arrows). The black circle indicates the approximate location of the pressure source at depth to explain the slope variations recorded around 13h-14h (black arrows). (© OVPF / IPGP)

No visual confirmation of a start of eruption could be made at 16:04 UTC on webcams due to poor weather conditions and we can not confirm the arrival of lava on the surface. Nevertheless the presence of a tremor shows the emission of hot and incandescent gas on the surface, and the possibility of lava emission in the short term or already in progress.

Under these conditions, the Prefect decided to implement the alert phase 2-2 "eruption underway in the Fouqué enclosure" of the specific device ORSEC volcano this Sunday, August 11, 2019 at 17:15

Public access to the Fouqué enclosure, from the Pas de Bellecombe trail or from any other trail, as well as from aircraft in the volcano area, are prohibited until further notice.

 

Sources:

- OVPF - activity bulletins of the day

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/)

- Prefecture of Reunion

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