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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
 Merapi - plume of the phreatic eruption of 11.05.2018 / 7:40 AM WIB - photo Magma Indonesia

Merapi - plume of the phreatic eruption of 11.05.2018 / 7:40 AM WIB - photo Magma Indonesia

A brief phreatic eruption occurred at Gunung Merapi on the island of Java on May 11th at 7:40 am WIB; it was accompanied by an eruptive column which rose very straight, and reached 5,500 meters above the summit.

Video of the eruption of Merapi this 11.05.2018, from the last stop before the summit

Merapi - seismogram of the phreatic eruption of 11.05.2018 / 7:40 AM WIB - Doc.Magma Indonesia

Merapi - seismogram of the phreatic eruption of 11.05.2018 / 7:40 AM WIB - Doc.Magma Indonesia

The eruption began with a small roar, and vibrations felt around the observation post, on which fell a shower of ashes and fine lapilli.

Vt earthquakes preceded this eruption on May 9 and 10, respectively 2 and 4/ day. Two hours before the eruption, the temperature inside the crater increased from 38.2 ° C at 1h WIB to 90 , 6 ° C at 8:30 WIB.

The event remained isolated and the volcanic alert level remains at 1 / normal.

About fifty hikers are reported on the volcano, on the last stop before the summit, without apparent damage.

Merapi - visuals of the crater on 11.05.2018 / respectively at 9h10 and 11h25 - Doc. BPPTKG
Merapi - visuals of the crater on 11.05.2018 / respectively at 9h10 and 11h25 - Doc. BPPTKG

Merapi - visuals of the crater on 11.05.2018 / respectively at 9h10 and 11h25 - Doc. BPPTKG

Merapi - ash cloud / Sat RGB Citra 11.05.2018 at 10am WIB and no fly zone above and south of the volcano / Flight radar
Merapi - ash cloud / Sat RGB Citra 11.05.2018 at 10am WIB and no fly zone above and south of the volcano / Flight radar

Merapi - ash cloud / Sat RGB Citra 11.05.2018 at 10am WIB and no fly zone above and south of the volcano / Flight radar

Following the eruption, a VONA was set up above and in the southern area of ​​Merapi. An Air Asia Singapore-Yogjakarta flight was diverted to Jakarta, following a likely closure of the destination airport.

Sources: PVMBG, Magma Indonesia, BNPB, BPPTKG
 

Dispersion of ashes from Merapi - map BNPB 11.05.2018

Dispersion of ashes from Merapi - map BNPB 11.05.2018

Kilauea - East rift zone - degassing on cracks; location of geothermal facilities threatened by a possible advance of the lava, bottom left. 09.05 2018 Extreme Exposure Fine Art Gallery / Bruce Omori

Kilauea - East rift zone - degassing on cracks; location of geothermal facilities threatened by a possible advance of the lava, bottom left. 09.05 2018 Extreme Exposure Fine Art Gallery / Bruce Omori

In the eastern rift zone of Kilauea, the eruption appears to be pausing: no lava emitted from any fissure at 7 pm on May 10, but sulfur dioxide emissions continue.

To report, the lava stop a mile from the geothermal plant, where thousands of liters of fuel are stored ... a strong explosion is likely in case of advance of the lava flow.
 

Kilauea - East rift zone - crevasses and steam west of Highway 130, under investigation by the USGS

Kilauea - East rift zone - crevasses and steam west of Highway 130, under investigation by the USGS

New cracks are likely to open, without prior localization possible. Cracks near Highway 130 continue to emit steam.

Seismic activity remains high; seismicity and deformation indicate that the magma intrusion migrates to the northeast.

Kilauea - East rift zone - strange breached structure (in an arc behind the emissions) ... never before seen following Ken Rubin - from Video

Kilauea - East rift zone - strange breached structure (in an arc behind the emissions) ... never before seen following Ken Rubin - from Video

Ken Rubin reports, based on videos from May 10, the rather unusual sighting of a breached cone of spatters / slag on one of the crack segments in Leilani Estates.

ALOS-2 / Jaxa data analysis by Caltech-JPL shows the opening of a dyke following the magmatic intrusion (communication from Eric Fielding)

Kilauea - Halema'uma'u's crater and two-colored plume  of the explosion following a collapse on 10.05.2018 - photo Paradise Helicopters

Kilauea - Halema'uma'u's crater and two-colored plume  of the explosion following a collapse on 10.05.2018 - photo Paradise Helicopters

In the summit area, no changes from yesterday.

The explosion of yesterday at 8:30 shows a two-colored plume, with the presence of a brown color in its upper part, sign of an incorporation of rock fragments.

Samples collected by an NSF researcher show that the explosion is due to the collapse of the wall of the vent following an earthquake. (NSF / Bruce Houghton) 

Source: HVO - USGS

Piton de La Fournaise - the eruptive site on 08.05.2017 - photo OVPF

Piton de La Fournaise - the eruptive site on 08.05.2017 - photo OVPF

At the Piton de La Fournaise, the field reconnaissance carried out on May 10th still shows an activity mainly focused on a main cone whose mouth continues to close. The second cone slightly further upstream showed today a more sustained activity than in recent days, with regular lava projections of 10-20m high.

Piton de la Fournaise 10.05.2018 - lava flows in the slope break below Piton Bert on May 10 (16h20 local time). (© OVPF / IPGP)

Piton de la Fournaise 10.05.2018 - lava flows in the slope break below Piton Bert on May 10 (16h20 local time). (© OVPF / IPGP)

Piton de La Fournaise - Thermal image of the lava flows in the slope break below Piton Bert on May 10 (16h20 local time). (© OVPF- IPGP)

Piton de La Fournaise - Thermal image of the lava flows in the slope break below Piton Bert on May 10 (16h20 local time). (© OVPF- IPGP)

The flow is still mainly in lava tubes with most of the resurgences and therefore flows visible at the level of the slope below Piton de Bert.

Many fires were observed on the 10.05 at the foot of the rampart and in the rampart, especially against the bottom of Piton Bert.

The surface flows estimated from the satellite data, via the HOTVOLC platform (OPGC - Clermont Ferrand) and MIROVA (University of Turin), recorded today were less than 2 m3 / s.

No significant deformation is recorded.

A volcano-tectonic earthquake has been recorded in the past 24 hours under the Piton de la Fournaise building.

Source: OVPF

2018.05.10 Piton de La Fournaise - fire departure at the casting front on May 10 (16h00 local time). (© OVPF - IPGP)

2018.05.10 Piton de La Fournaise - fire departure at the casting front on May 10 (16h00 local time). (© OVPF - IPGP)

Small complement with the activity of Sabancaya and Sinabung these last days, in some images.

Sabancaya - summary of the activity from April 30 to May 6, 2018 - IG Peru

Sabancaya - summary of the activity from April 30 to May 6, 2018 - IG Peru

Sabancaya 10.05.2018- eruptive plume slanted east - photo flight FL320 via IG Peru / Twitter

Sabancaya 10.05.2018- eruptive plume slanted east - photo flight FL320 via IG Peru / Twitter

Sinabung - 09.05.2018 / 15h14 - photo Endro Lewa

Sinabung - 09.05.2018 / 15h14 - photo Endro Lewa

Sinabung - seismicity on 10.05.2018 - Doc. Magma Indonesia

Sinabung - seismicity on 10.05.2018 - Doc. Magma Indonesia

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