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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
 Site of the current eruption - photo Hawaii News Now

Site of the current eruption - photo Hawaii News Now

At Kilauea, the eruption in the Leilani Estates Subdivision in the Lower East Rift Zone continues this May 5th at 2:04 UTC / 4am 4:04 pm HST.

Several eruptive fissures or vents opened during the previous day, several hundred meters long. The most recent cracks are located on the east side of the subdivision; not all vents are active and no lava flows have progressed far.

The HVO informs on a map the three active fractures; lava emissions were preceded by soil fracturing and heavy outgassing. Spatters and lava accumulate first in the first tens of meters of the vents.

Seismicity and deformation are consistent with continuous accumulation of magma in the rift zone, and other lava outbreaks are expected.

Kilauea rift zone East - 04.05.2018 / 1h03 opening of fissure 2 - photo HVO - USGS

Kilauea rift zone East - 04.05.2018 / 1h03 opening of fissure 2 - photo HVO - USGS

 Kilauea rift zone East - 04.05.2018 / 5:57 degassing just before the opening of crack 3 in Kaupili Street. / Leilani estates - picture HVO - USGS

Kilauea rift zone East - 04.05.2018 / 5:57 degassing just before the opening of crack 3 in Kaupili Street. / Leilani estates - picture HVO - USGS

Kilauea rift zone East - location of eruptive fissures in Leilani Estates at 04.05.2018 / 8h - HVO map

Kilauea rift zone East - location of eruptive fissures in Leilani Estates at 04.05.2018 / 8h - HVO map

Two houses were destroyed; The Fire Department provides high levels of sulfur dioxide in the evacuation zone.

All residents of the subdivisions of Leilani Estates and Lanipuna Gardens must evacuate, taking the necessary of subsistence, level in such circumstances. Shelters are open to receive them.

The police recall the temporary prohibition of flight over the area ... drones can be confiscated during this period.

The Puna Geothermal Power Plant has suspended production until further information.

Kilauea - 04.05.2018 Earthquake M 6,9 / 22:32 UTC / 5.0 km depth (blue circle) - doc.USGS. and reaction of Pu 'O'o after the earthquake (collapse) - photo Lynn Kawano
Kilauea - 04.05.2018 Earthquake M 6,9 / 22:32 UTC / 5.0 km depth (blue circle) - doc.USGS. and reaction of Pu 'O'o after the earthquake (collapse) - photo Lynn Kawano

Kilauea - 04.05.2018 Earthquake M 6,9 / 22:32 UTC / 5.0 km depth (blue circle) - doc.USGS. and reaction of Pu 'O'o after the earthquake (collapse) - photo Lynn Kawano

A magnitude 6.9 earthquake occurred on May 4 at 22:32 UTC, 16 km southwest of Leilani Estates, and a depth of 5 km.

The USGS points out that its location is the same as in the 1975 deadly earthquake, magnitude 7.1.

Sources: HVO, USGS & Civil Defense of County of Hawaii 04.05.2018 / 4:20

Piton de La Fournaise - the eruptive site on 03.05.2018 at 12.30 local time - photo © IPGP- OVPF

Piton de La Fournaise - the eruptive site on 03.05.2018 at 12.30 local time - photo © IPGP- OVPF

At Piton de La Fournaise, the tremor is relatively stable.

The field reconnaissance carried out yesterday and today shows an activity mainly focused on the central vent with a cone now completely closed from which lava projections escape. The activity in the lava tunnel is now well developed and frequent breakthroughs in the roof of these tunnels let escape many sprues.

The surface flows estimated from the satellite data, via the HOTVOLC platform (OPGC - Clermont Ferrand) and MIROVA (University of Turin), recorded today were between 1 and 3.5 m3/ s. It should be noted that these measures are only partial as a result of the bad weather conditions on the Fournaise massif during the last 24 hours.

A very slight deflation of the volcano is still recorded on the OVPF deformation sensors. This means that the volume of magma coming out of the reservoir to feed the eruption is greater than the volume of magma that replenishes it.

No volcano-tectonic earthquake has been recorded in the past 24 hours under the Piton de la Fournaise building.

Source: OVPF

 Piton de la Fournaise - the central cone is completely closed - photo 04.05.2018 / Stephane Nicael via Fournaise info

 Piton de la Fournaise - the central cone is completely closed - photo 04.05.2018 / Stephane Nicael via Fournaise info

Piton de La Fournaise - Illustration of the summit deformation between 05.03 and 05.05.2018. Here is shown a baseline (variation of distance between two GPS receivers) crossing the crater Dolomieu. A rise is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions.

Piton de La Fournaise - Illustration of the summit deformation between 05.03 and 05.05.2018. Here is shown a baseline (variation of distance between two GPS receivers) crossing the crater Dolomieu. A rise is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions.

Piton de La Fournaise - the eruptive site is well cleared this 05.05.2018 / 6h06 - webcam Piton Bert

Piton de La Fournaise - the eruptive site is well cleared this 05.05.2018 / 6h06 - webcam Piton Bert

Strombolian activity does not falter at Pacaya : recurring projections rise 40-80 meters above the Mackeney cone. They feed two lava flows towards the collapse zone of 2010.

The explosions are recorded by the PCG seismic station, which shows an increase in the RSAM between 4,000 and 4,500 units.

Pacaya - RSAM 03.05.2018

Source: Insivumeh

Pacaya - Strombolian activity and lava flows on 03.05.2018 / 22h56 local - FLIR thermic cam.- Insivumeh

Pacaya - Strombolian activity and lava flows on 03.05.2018 / 22h56 local - FLIR thermic cam.- Insivumeh

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