Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog

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 : #volcanic activity
 Sheveluch - ash plume from 12.22.2020 - photo Instagram / Soloviev Evgenii via K.Bakhanov

 Sheveluch - ash plume from 12.22.2020 - photo Instagram / Soloviev Evgenii via K.Bakhanov

Sheveluch- ash fall near the volcano on 12.22.2020 - photo Soloviev Evgenii via K.Bakhanov

Sheveluch- ash fall near the volcano on 12.22.2020 - photo Soloviev Evgenii via K.Bakhanov

In Sheveluch, KVERT reported, this December 22 at 01:22 UTC, an explosion accompanied by an ash plume at 8,000 meters asl, then extending towards the northeast of the volcano for 42 km. The aviation code changed to red, before turning orange again at 02:55 UTC; the height of the ashes being reported then at 6,500-7,500 m. with an extension to the east for 130 km.

Note that the dacitic lava block, called "Dolphin", which had emerged from the summit lava dome on September 28, has not been present since December 8 ... a sign of the evolution of the dome.

 

Source: KVERT

Sheveluch - thermal anomalies at 12/22/2020 / 04h55 - Doc. Mirova _MODIS_VRP

Sheveluch - thermal anomalies at 12/22/2020 / 04h55 - Doc. Mirova _MODIS_VRP

Sheveluch - morphological changes of the dome, and disappearance of the "Dolphin" - photos KVERT - one click to enlarge
Sheveluch - morphological changes of the dome, and disappearance of the "Dolphin" - photos KVERT - one click to enlarge

Sheveluch - morphological changes of the dome, and disappearance of the "Dolphin" - photos KVERT - one click to enlarge

The summit eruption of Kīlauea continues, from at least two vents on the north and west sides of Halema’uma’u.

As of the morning of December 22, the growing crater lake was 487 m. below the crater rim, indicating that the lake rose 134 m. from the bottom of Halemaʻumaʻu crater. The level rises more than 1 meter per hour.

Of the three vents that initially erupted from the north and northeast walls of Halema'uma'u, only two remain active, with the central vent interrupting eruptive activity between approximately 7:30 am and 8:00 am HST. The middle and western vents, located on the lowest block of Halema'uma'u Crater, have since been inundated by the growing lava lake. The vent furthest to the east remains the most vigorous.

A preliminary volume calculation suggests that since the start of the eruption, around 10 million cubic meters of lava have erupted (equivalent to over 2 billion gallons). It is an area of ​​approximately 33 acres.

Summit tiltmeters continued to record a slowing deflationary tilt this morning. Sulfur dioxide emission rates remain high, estimated at around 30,000 tonnes / day. Seismicity is high but stable on the last day, with few earthquakes and tremor fluctuations related to the strength of the fissure fountain.

Kilauea - active fissures in Halema'uma'u crater on 12/22/2020 / 11:35 a.m. HST, and the floating island about 17 m high. - photo HVO-USGS

Kilauea - active fissures in Halema'uma'u crater on 12/22/2020 / 11:35 a.m. HST, and the floating island about 17 m high. - photo HVO-USGS

Kilauea - Halema'uma'u lava lake on 12.22.2020 / 11.30 a.m. and on 12.21.2020 / 11.20 a.m. - the reduction in height between the top and the bottom of the cracks testifies to the increase in the level of the lava lake - Doc. cam.therm. HVO-USGS

Kilauea - Halema'uma'u lava lake on 12.22.2020 / 11.30 a.m. and on 12.21.2020 / 11.20 a.m. - the reduction in height between the top and the bottom of the cracks testifies to the increase in the level of the lava lake - Doc. cam.therm. HVO-USGS

Large amounts of volcanic gas - mainly water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2) - are continually released during eruptions of Kīlauea volcano.

As SO2 is released from the top in this new eruption, it will react in the atmosphere with oxygen, sunlight, moisture, and other gases and particles, and convert to few hours to a few days in fine particles. The particles scatter sunlight and cause the visible haze that has been observed downwind of Kīlauea, known as VOG (volcanic smog), during previous eruptions at the summit. Vog creates the potential for airborne health hazards for residents and visitors, damages agricultural crops and other plants, and affects livestock operations.

Kilauea - degassing at the lava lake / eruption in progress on 22.12.2020 - Doc. USGS Photo Mr. Patrick

Kilauea - degassing at the lava lake / eruption in progress on 22.12.2020 - Doc. USGS Photo Mr. Patrick

The intense explosive activity of the Ontake crater on Suwanosejima (Ryukyu Islands) continues characterized by almost constant explosions (89 December 21).

Strombolian explosions are getting stronger than the average size of explosions on the volcano and more frequent at regular intervals of 2 to 4 per hour over the past few weeks.

An explosion generated an ash plume which reached approx. 600 m-1,200 m above sea level and drifts to the southwest. Some of the lava bombs were ejected up to 800m from the crater.

In addition, the activity is accompanied by a strong glow from the Otake crater which suggests a rise in the flow of magma inside the volcano.

The warning bulletin states that ballistic impacts from volcanic bombs and pyroclastic flows could affect an area approximately 1 km away from the main crater, with an alert level of 2 on a scale of 5.

 

Source: JMA - Japanese Meteorological Agency

Suwanosejima - incandescence on 12/22/2020 / 3:10 a.m. and 5:08 a.m. following continued Strombolian activity - JMA webcam - one click to enlargeSuwanosejima - incandescence on 12/22/2020 / 3:10 a.m. and 5:08 a.m. following continued Strombolian activity - JMA webcam - one click to enlarge

Suwanosejima - incandescence on 12/22/2020 / 3:10 a.m. and 5:08 a.m. following continued Strombolian activity - JMA webcam - one click to enlarge

An eruption occurred at Sakurajima (Mount Minamidake summit crater) at 9:21 pm on the 22nd, and the ash plume rose 2,400m above the crater rim.

The volcanic ash was washed away from the crater in a south-eastern direction (towards Tarumizu / Kaya), and at 3:00 a.m. on the 23rd, towards the city of Kagoshima (Sakurajima), and the city of Kaya. There is a small amount of ash falling in Tarumizu Town, Shibushi Town, Osaki Town, Higashi Kushira Town and Hebei Town, and ash fall is expected to Hebei in Kagoshima Prefecture.

 

Source: JMA

Sakurajima - activity of 22.12.2020 / 21h48 - Doc. JMA

Sakurajima - activity of 22.12.2020 / 21h48 - Doc. JMA

Sakurajima - 12/22/2020 - image Sentinel-2 L1C bands 12,11,4 - one click to enlarge

Sakurajima - 12/22/2020 - image Sentinel-2 L1C bands 12,11,4 - one click to enlarge

The schematic summary of the activity of Sabancaya, Peru, mentions an average of 34 explosions daily, accompanied by plumes of ash and gas reaching 3.3 km in height. Ash falls are reported in the locality of Huambo

 

Source: I.G. Peru

Sabancaya - summary of activity between 14 and 20.12.2020 - Doc. I.G. Peru

Sabancaya - summary of activity between 14 and 20.12.2020 - Doc. I.G. Peru

Commenter cet article

Articles récents

Hébergé par Overblog