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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
 Sinabung - eruptive plume of the volcano seen by the satellite Terra Modis 19.02.2018 - Doc. Nasa World Eosdis

Sinabung - eruptive plume of the volcano seen by the satellite Terra Modis 19.02.2018 - Doc. Nasa World Eosdis

Back on the strong eruption of Sinabung yesterday 19 February:

After the abrupt eruption that lasted over 607 seconds, the eruptive plume is mounted according to observers at a height between 5,000 and 7,000 meters, do not reach the stratosphere, and the first estimates of the sulfur dioxide flux produced are too low for have significant atmospheric effects ... despite its impressive size, the eruption will not have a climatic impact (E.Klemetti / Rocky planet)

Sinabung - 19.02.2018 - Pyroclastic flows obscure the sky - Photo Endro Lewa

Sinabung - 19.02.2018 - Pyroclastic flows obscure the sky - Photo Endro Lewa

The ashes of the volcano dispersed yesterday to the north of Sumatra, rather than to the west as one would expect according to the direction of the winds, and for more than 100 km.

Significant pyroclastic flows, which obscured the horizon, appear to have been generated by both the collapse of the eruptive column, and based on the photos of the dome before and after the eruption, by its almost complete annihilation. The summit area was impacted by the direct fallout of ash.

Sinabung - the ashes of the eruption affect life north of the volcano - photos Endro Lewa 19.02.2018
Sinabung - the ashes of the eruption affect life north of the volcano - photos Endro Lewa 19.02.2018

Sinabung - the ashes of the eruption affect life north of the volcano - photos Endro Lewa 19.02.2018

Sinabung - 19.02.2018 - The fear of schoolchildren coming out in panic before the collapse of the eruptive column and the pyroclastic flows that develop

Sinabung - the summit and the dome before and after the eruption of 19.02.2018 - The dome has almost disappeared and the volcanic ash has leveled the summit area - doc.BNPB

Sinabung - the summit and the dome before and after the eruption of 19.02.2018 - The dome has almost disappeared and the volcanic ash has leveled the summit area - doc.BNPB

Various satellite images describe the ash heights and concentrations in the ash cloud emitted.
 

Sinabung - images Himawari-8 AHI 19.02.2018 / 3:30, respectively from L to R, in false colors, and indicating the height of ashes and dust, or the radiative effects - Doc. NOAA / CIMSS / HimawariSinabung - images Himawari-8 AHI 19.02.2018 / 3:30, respectively from L to R, in false colors, and indicating the height of ashes and dust, or the radiative effects - Doc. NOAA / CIMSS / Himawari
Sinabung - images Himawari-8 AHI 19.02.2018 / 3:30, respectively from L to R, in false colors, and indicating the height of ashes and dust, or the radiative effects - Doc. NOAA / CIMSS / Himawari

Sinabung - images Himawari-8 AHI 19.02.2018 / 3:30, respectively from L to R, in false colors, and indicating the height of ashes and dust, or the radiative effects - Doc. NOAA / CIMSS / Himawari

Sources: PVMBG, Magma Indonesia, BNPB, Rocky Planet

Villarica - rise of the lava lake in the crater and strengthening of the radiative power, between 5 and 18 February 2018 - credit: POVI / Agencia Espacial Europea (ESA) / Área Sensores Remotos of the Fundación Volcanes de Chile

Villarica - rise of the lava lake in the crater and strengthening of the radiative power, between 5 and 18 February 2018 - credit: POVI / Agencia Espacial Europea (ESA) / Área Sensores Remotos of the Fundación Volcanes de Chile

In Villarica / Chile, the lava lake resumed its rise in its well after a six-week period of low activity and subsidence.

Source: POVI

Activity of Sabancaya between 12 and 18.02.2018 - Doc. IG Peru / OVI / Ingemmet

Activity of Sabancaya between 12 and 18.02.2018 - Doc. IG Peru / OVI / Ingemmet

The week of activity from February 12 to 18 in Sabancaya / Peru is similar to the previous one, characterized by an average of 19 explosions per day, plumes of ash and gas rising to a maximum of 2,500 meters above the crater, and the predominance of LP earthquakes, associated with fluid motions, and emission tremors.

The flow of sulfur dioxide remains high, with 9,270 tons / day on February 15, which can cause acid rain in areas near the volcano.

Alert level remains orange

Sources: IG Peru / OVI / Ingemmet

Earthquakes in the Tjörnes fracture zone - at 20.02.2018 / 8h - Doc.IMO
Earthquakes in the Tjörnes fracture zone - at 20.02.2018 / 8h - Doc.IMO

Earthquakes in the Tjörnes fracture zone - at 20.02.2018 / 8h - Doc.IMO

The people of Iceland's Grimsey Island have had a bad night ... in the last 48 hours, 1,536 earthquakes have been detected, including an episode of magnitude 5.2 and another of M 4.5. , felt on a large area in the north of Iceland.

This large seismic swarm marks the oblique rift zone of Grimsey, and the submarine volcanic system of Nafir.

No deformation is observed by nearby GPS stations, which may indicate a magmatic intrusion. This parameter and the depth of the earthquakes suggest a tectonic process marking the edge of divergent plates.

Sources: IMO & Institute of Earth Science
 

Tjörnes Fracture Zone  - Map to 19.02.2018 / 15h -  Red points show the locations of  manually checked earthquakes since midnight, 19th February; the green ones show the locations of earthquakes since January 2018. Earthquakes with magnitude larger than 4 are shown as black stars and the white star indicates the location of the M5.2 earthquake. The beachball (black/white ball) shows its focal mechanism, normal faulting. Grey dots show seismicity over the period 1994-2017. The brown lines show the  Húsavík fault on-land and the black arrows the direction of plate motion along the Húsavík-Flatey fault (HFF). Black triangles denote IMO's seismic stations.

Tjörnes Fracture Zone - Map to 19.02.2018 / 15h - Red points show the locations of  manually checked earthquakes since midnight, 19th February; the green ones show the locations of earthquakes since January 2018. Earthquakes with magnitude larger than 4 are shown as black stars and the white star indicates the location of the M5.2 earthquake. The beachball (black/white ball) shows its focal mechanism, normal faulting. Grey dots show seismicity over the period 1994-2017. The brown lines show the  Húsavík fault on-land and the black arrows the direction of plate motion along the Húsavík-Flatey fault (HFF). Black triangles denote IMO's seismic stations.

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