August 01, 2015. English . Piton de la Fournaise , Raung , Ubinas .

Home / blog georges Vitton / August 01, 2015. English . Piton de la Fournaise , Raung , Ubinas .

August 01, 2015. English . Piton de la Fournaise , Raung , Ubinas .

August 01, 2015.



Piton de la Fournaise , La Réunion :

Piton l’a peté….

Change to Alert phase 2-2 Volcano emergency Plan with effect from Friday, July 31, 2015 at 10:00 (local time)
At 9:20 (local time) this morning, the Piton de la Fournaise erupted. The eruptive fissure is located North East of Piton Kapor and extends toward the Nez Coupe Ste Rose
Public access to the enclos Fouqué, whether from the path of Pas de Bellecombe or from any other path, and the helicopter posed in the volcano area is prohibited until further notice.
The national gendarmerie and the national Forest Office were responsible for ensuring the implementation of these security measures on the site.



According to information provided by the volcano observatorythe eruption occurs in the Crater Faujas, northeast of Dolomieu. The eruptive fissure is about 200m long.
The Piton de la Fournaise offers a spectacle for the third time since the beginning of 2015.
The sky, the show is great. On footage shot this Friday, July 31you can admire several lava fountains!



 State of the eruption , OVFP bulletin , July 31, 2015. 20h00.

The eruption that began this morning at 9:20 local continues tonight.
Although the level of tremor has decreased slightly throughout the day, the intensity of the event remains important.

A long crack approximately 1 km opened in several hours on a ledge topographic zone in the North East of the Enclos at the Pitons  Payenké and Kapor. These cracks escaped a dozen fountains that tonight would be only five. The longest lava flow reached this afternoon the Plain of Osmunds.



Recognition and specimens on site were able to be conducted with the logistical assistance of SAG (Section of the Air Force)
Estimates of flow rates between 28 m3 / s (first) and 11m3 / s (thereafter) were produced from the gas measurements and are confirmed by satellite image analysis.
The plume of volcanic gas reaches tonight 3200-3500 m altitude.

Alert level: ongoing Eruption


Source : OVPF

Photo : OVPF ,  Clicanoo.


Raung , Indonésie: 

8.125 ° S, 114,042 ° E

Elevation 3332 m

PVMBG reported that the eruption at Raung was ongoing during 16-23 July. Ash plumes rose 2 km and incandescence at the crater was visible. Seismicity fluctuated but remained elevated. The Alert Level remained at 3 (on a scale of 1-4), and the public was reminded not to approach the crater within a 3-km radius.


Based on PVMBG information, and satellite-image and pilot observations, the Darwin VAAC reported that during 22-28 July ash multiple ash plumes from Raung rose to varying altitudes of 4.3-5.2 km (14,000-17,000 ft) a.s.l. and drifted as far as 400 km NW, W, SSW, S, and SSE. A news article from 29 July noted that 18 flights at most had been canceled during the previous few days due to the ash plumes, and that the Notohadinegoro Airport (2,100 km SW) had been temporarily closed.

Sources: Volcanic Ash Advisory Centre Darwin (VAAC), Pusat Vulkanologi dan Mitigasi Bencana Geologi  , Jakarta Post, GVP.

Photo : narut leksansern




Ubinas, Perou :


A) Between 18 April and 1 June 2015 the Ubinas volcano seismicity was characterized by various types of earthquakes (LP low-energy , tremors,   some volcanos – tectonic  VT, and hybrid). However, as the week of June 2 to 8, significant changes were observed and the number of VT earthquakes has sharply increased. Subsequently, on June 14, very energetic hybrid earthquakes were recorded. The following days and during the month of July the seismicity rose sharply , low energy explosions were recorded (0.3 MJ to 4 MJ), but in increasing numbers, with the issuance of moderate ash volumes. On July 25 at 7:03 p.m. HL explosion which reached 507 MJ of energy was recorded, being the strongest ever held in 2015. Fifteen minutes after the explosion, the fallout of ash and lapilli were observed (rock fragments 2 to 3 mm, and some up to 2 cm in diameter) in the cities of Ubinas and Escacha.



B) Between April 18 and July 16, flows of volcanic SO2 gas remained at high levels. The 17, 18 and 19 July, these flows reached the highest values in 2015, with 4969 t / d, 4872 t / day and 4927 t / d, respectively. On July 19, this flow decreased gradually until July 25 to 589 t / d, indicating that the conduits were closed after the explosion. Between 26 and 29 July these flows were below 1080 t / day.C) During the period from April to mid-June, the height of the plume of gas and ash was less than 1500 m above the top of the volcano, for later increase to 2800 m until mid-July .


On July 25 at 19:03 HL an explosion accompanied by a roar that shook the tin roofs in the town of Ubinas, located 6 km from the crater was observed. The explosion projected glowing rock fragments that have fallen to the east and southeast of the crater. Simultaneously there has been a significant release of ash and gas that rose around 4000 m high, accompanied by lightning. Within a few hours, it was reported in the city of Ubinasash of coarse falls (from 2 to 3 mm, and up to 1.5 cm) and sulfur gas characteristic odors.



Summary of eruptive activity:
After nearly two months of relative calm, the Ubinas volcano has shown signs of a growing increase in seismic activity and gas and ash emissions. During the second and third week of July, this increase in activity was more evident, and on July 25 an explosion took place, with calculated energy of 507 MJ, the highest recorded this year. Associated with this explosion, it was issued by the Ubinas a moderate volume of volcanic ash and gas that rose to 4000 m above the top of the volcano. The ash fell mainly on villages in eastern and southeast of the volcano, reaching distances up to 20 km. These particles can cause negative effects on human health and affect agriculture and livestock.



Source : IGP / Ingemmet.

Photo : Pumacota, Latintimes .

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