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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 : #Actualités volcaniques
Piton de La Fournaise - disappearance of the Rosemont Chapel (red circle) under the lava of the flows - photo 13.07.2018 © Brieuc Coessens

Piton de La Fournaise - disappearance of the Rosemont Chapel (red circle) under the lava of the flows - photo 13.07.2018 © Brieuc Coessens

Following the end of the eruption on July 13 at 22:00, strong seismic activity is still recorded at Piton de La Fournaise.
Since the end of the eruption and until 15:30 this day (July 14), 51 superficial volcano-tectonic earthquakes (<2 km below the surface) have been recorded, an average of about 3 events per hour. The majority of these earthquakes are located under the northern edge of the crater Dolomieu. This shows that the feeding system of the deep volcano remains under pressure.
No significant deformities were observed today.

The OVPF survey this morning made it possible to map all the lava flows emitted during the July 13 eruption (Figure 1) and to estimate its volume at around 0.3 million m3. These flows covered approximately 400 m of markers on the hiking trail leading to the summit.


No assumptions are made about future developments in the near future (resumption of activity on the same site, resumption of activity elsewhere, permanent shutdown).

Source: OVPF

Piton de la Fournaise 14.07.2018 - cartography of lava flows emitted during the July 13, 2018 eruption made from aerial images processed by stereophotogrammetry. - In yellow, the hiking trail, cut by the lava flows - white lines - emitted by the 4 cracks - red lines - Doc OVPF

Piton de la Fournaise 14.07.2018 - cartography of lava flows emitted during the July 13, 2018 eruption made from aerial images processed by stereophotogrammetry. - In yellow, the hiking trail, cut by the lava flows - white lines - emitted by the 4 cracks - red lines - Doc OVPF

The Agung has twice erupted this morning:

- a first eruptive episode occurred this 15.07.2018 at 04:52 WITA and lasted 2 min.20 sec. The plume could not be observed.

- the second lasted 1min.45 sec., and was accompanied by a plume of ash rising to 1,500 meters. The BNPB reports ash falls in various villages: Bhuana Giri, Pidpid, Nawa Kerti, Datah Ababi, Abang Kertha Mandala and Amlapura.

Bali Airport operates normally. The VONA is orange.

The seismicity of July 15th, between 0h and 18h, ​​is characterized by 1 eruption earthquake, 3 blast earthquakes, 4 superficial volcanic earthquakes, and 1 deep, and 1 distant tectonic earthquake.

Sources: PVMBG & BNPB

Agung - eruptive plume of 15.07.2018 / 9:08 WITA - Webcam PVMBG

Agung - eruptive plume of 15.07.2018 / 9:08 WITA - Webcam PVMBG

In the eastern rift zone of Kilauea, fissure 8 continues to dump its lava into the perched channel to the northeast; levels in the upper channel increased for several hours after the summit meltdown on July 13 at 19:08, then returned to lower levels early in the afternoon. A small overflow is reported near the vent.

At its entrances to the sea, the south of the lava front is located on July 14 in the morning at 1 km from Isaac Hale Park, while on the 6 km of the sea front, the lava oozes in various places.

Source: HVO-USGS

Kilauea East rift zone - 13.07.2018 / 18h loc. - the spatter cones on the fissure 8 and the beginning of the canalized casting - photo Bruce Omori

Kilauea East rift zone - 13.07.2018 / 18h loc. - the spatter cones on the fissure 8 and the beginning of the canalized casting - photo Bruce Omori

Kilauea East rift zone - 13.07.2018 / 18h loc. - the small island formed near the coast at the northern end of the sea entrances - photo Bruce Omori

Kilauea East rift zone - 13.07.2018 / 18h loc. - the small island formed near the coast at the northern end of the sea entrances - photo Bruce Omori

Kilauea East rift zone - 13.07.2018 / 18h loc. - The sea entry in Ahalanui is moving south and at 18h, is less than a mile from Pohoiki boat ramp - photo Bruce Omori

Kilauea East rift zone - 13.07.2018 / 18h loc. - The sea entry in Ahalanui is moving south and at 18h, is less than a mile from Pohoiki boat ramp - photo Bruce Omori

In Kamchatka, the KVERT peaks Karymsky activity on 14 July 2018 at 22:47 Z, which emitted an ash plume rising to 3,500 meters asl. before drifting to the WSW; the cloud was pointed by the satellite Aqua Modis at 15 km at 22:47, 40 km on July 15 at 1:15 and 77 km at 3:13.

Source: KVERT

Karymsky - Volcanis ash advisory 15.07.2018 / 00hz - Doc. VAAC Tokyo

Karymsky - Volcanis ash advisory 15.07.2018 / 00hz - Doc. VAAC Tokyo

The IMO changed the status of Öraefajökull on 13 July. This volcano shows clear signs of instability, coupled with a phase of inflation for a year and a half, reflected by an increase in seismic activity and deformation, which are persistent.
The probable cause of this inflation is one injection of new magma, with an estimated volume of about 10 million m³, a volume comparable to the intrusion under the Eyjafjalajökull before the eruption of 2010.

Despite a drop in geothermal activity since the end of December, new resistivity measurements indicate the presence of altered rocks at superficial levels within the caldera due to high temperatures.

Two scenarios are proposed:

- an increase in geothermal activity with associated floods and gas emissions.

- an evolution towards a pre-eruptive stage, without being able to specify its evolution in the time, nor the time of the eruption.

Civil Protection and scientists briefed local people, and an evacuation plan was prepared. The monitoring of the volcano is reinforced.

Sources: IMO & Iceland monitor

Öraefajökull - map of points and boundaries of the evacuation zone - Doc.IMO

Öraefajökull - map of points and boundaries of the evacuation zone - Doc.IMO

Öraefajökull - photo © Bernard Duyck / archives 2015

Öraefajökull - photo © Bernard Duyck / archives 2015

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