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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 : #volcanic activity
Shinmoedake crater / Kirishima group - photo archives 2003 - click to enlarge

Shinmoedake crater / Kirishima group - photo archives 2003 - click to enlarge

The JMA reported an increase in volcanic earthquakes just below Shinmoedake (Shinmoe Peak, a stratovolcano in the Kirishimayama group of volcanoes).

A total of 17 events were recorded from March 1-2, prompting JMA to raise the Alert Level to 2 (on a scale of 1-5) on March 2. No changes were observed on the volcano during a field visit the same day.

Volcanic earthquakes persisted, with 5 to 12 events per day recorded until March 7. Emissions had not risen more than 30 m above the crater rim since January 1, and fumarolic plumes continued to rise within 100 m of a fissure on the western flank. During a field survey conducted on March 4 at the base of the volcano, sulfur dioxide emissions were below the detectable limit and no changes in hot springs in the area were observed.

 

Source: Japan Meteorological Agency (JMA) / via Global Volcanism Program

New Britain island - from left to right the plumes of Langila, Ulawun & Rabaul - Nasa Modis 21.06.2005 - Jesse Allen - one click to enlarge

New Britain island - from left to right the plumes of Langila, Ulawun & Rabaul - Nasa Modis 21.06.2005 - Jesse Allen - one click to enlarge

Darwin's VAAC reported that on March 6, an ash plume from Langila rose 3,000 meters above sea level and drifted SE. The plume dissipated within an hour.

On March 8, an ash plume rose to 3,700 m. asl. and drifted NW. The ash was no longer visible on satellite images within three hours.

The eruptive stage of Langila, in progress, began in October 2015.
 


Source: Darwin Volcanic Ash Advisory Center (VAAC) / via Global Volcanism Program

Manam, fumaroles in the crater - Google Earth inset of summit shows location of photograph / 18.10.2019. Courtesy of Vulkanologische Gesellschaft and Claudio Jung, used with permission. / GVP

Manam, fumaroles in the crater - Google Earth inset of summit shows location of photograph / 18.10.2019. Courtesy of Vulkanologische Gesellschaft and Claudio Jung, used with permission. / GVP

Some details provided by the Rabaul volcano Observatory, via the GVP, on the eruption of Manam on March 8 (yesterday article) :

The RVO reported that a small pyroclastic flow moving down the flank of Manam was visually observed and recorded on webcam images at 9:11 a.m. on March 8. Minor ash emissions drifting northwest were occasionally visible throughout the day.

RSAM values ​​rose sharply at 7:00 p.m. coinciding with the escalation in activity. An intense Strombolian phase at the south crater was observed between 7:10 p.m. and 8:30 p.m., characterized by loud roars and rumbles heard on the mainland (22 km to the southwest), bright incandescence at the summit and ash emissions. The alert level was raised to stage 3.

The Darwin VAAC estimated that at 7:50 p.m. the ash plume had reached 15.2 km a.s.l. and drifted west. The plume had broken away from the summit at 8:50 p.m. and dissipated at 12:50 a.m. on March 9.

 

Source: Rabaul Volcano Observatory (RVO) / via Global Volcanism Program

 IBU volcano - 03.10.2022 / 10:27- webcam PVMBG /  Magma Indonesia webcam

IBU volcano - 03.10.2022 / 10:27- webcam PVMBG / Magma Indonesia webcam

The Ibu volcano, in the Moluccas archipelago, is clearly visible until it is covered with fog 0-III. Smoke from the main crater is white and gray with fine, medium to thick intensity, about 200-1000 meters high from the summit. The weather is sunny to cloudy, the winds are light to moderate in the north and east.

Seismic observation of March 9, 2022:
- 46 Eruption/Eruption earthquakes with an amplitude of 15 to 30 mm and an earthquake duration of 20 to 65 seconds.
- 80 avalanche earthquakes, with an amplitude of 2-30 mm and an earthquake duration of 15-120 seconds.
- 30 blast/emission earthquakes, with an amplitude of 5 to 14 mm and an earthquake duration of 10 to 35 seconds.
- 32 times the harmonics with an amplitude of 4 to 14 mm and an earthquake duration of 25 to 130 seconds.
- 51 shallow volcanic earthquakes
- 4 deep volcanic earthquakes
- earthquake was felt, MMI scale II
- 8 distant tectonic earthquakes.

This March 10, two eruptive episodes are mentioned:

the first at 10:03 WIT with the height of the ash column observed at ± 800 m above the peak (± 2125 m above sea level). The ash column is observed gray with moderate intensity towards the east. This eruption was recorded on a seismograph with a maximum amplitude of 27 mm and a duration of 50 seconds.

The second at 10:27 WIT with the height of the ash column observed at ± 1000 m above the peak (± 2325 m above sea level). It is observed that the ash column is gray in color with a thick intensity towards the east. This eruption was recorded on a seismograph with a maximum amplitude of 24 mm and a duration of 60 seconds.

Communities around Mount Ibu and visitors/tourists are advised not to travel within the 2.0 km radius and the sector expansion is 3.5 km to the crater opening in the northern part from the active crater of Mount Ibu.

 

Sources: PVMBG, Magma Indonesia

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