Merapi - coulée pyroclatiques d'avalanche le 28.12.2021 / 07h14 WIB - notez le dôme SO juste à droite du départ de la coulée - webcam Tunggularum - un clic pour agrandir
Two avalanche pyroclastic flows were observed at Merapi on December 28, 2021, respectively at 03:30 WIB, with a trace on the seismogram with an amplitude of 28 mm / during 111 sec., And at 07:12 WIB, with an amplitude of 18 mm / for 78 sec. They covered distances of approximately 1,800 and 1,200 meters.
The southwest lava dome presents a rapid increase in height of several meters, and a high risk of collapse, confirmed by visual observations of Andi Volcanist, Volcanodiscovery guide.
In the latest BPPTKG report, dated December 23, 2021, the volume of the southwest dome was 1,654,000 m³.
The seismicity of December 28 is characterized by:
- 2 earthquakes marking the pyroclastic avalanche flows, with an amplitude of 18-29 mm and an earthquake duration of 99-111 seconds.
- 99 collapse earthquakes, with an amplitude of 3 to 19 mm and a duration of 16.1 to 166.9 seconds.
- 10 blast / emission earthquakes, with an amplitude of 2 to 8 mm and the duration of the earthquake from 9 to 34.8 seconds.
- 2 hybrid / multiphase earthquakes
- 2 distant tectonic earthquakes.
The activity level remains at 3 / siaga
Sources: BPPTKG, PVMBG, Magma Indonesia, Andi Volcanist
In Guatemala, the Santiaguito volcano maintains high seismic activity and constant white and gray outgassing from the level of the dome up to 250 meters above it, as well as weak and some moderate explosions that disperse in the direction of the wind at a distance of 10 to 15 kilometers.
Ash falls are reported in the villages of San Marcos, Loma Linda Palajunoj and others in this region.
The seismic stations of STG3 and STG8, record moderate and strong avalanches. The incandescence persists at the Caliente dome and instability at the level of the lava flow.
The Santiaguito is in a high period of lava extrusion, this causes constant avalanches of boulders around the volcanic building, which can generate strong avalanches and even pyroclastic flows, so you should not stay near or in the beds of the river near the slopes of the volcano.
Fuego - explosion on 12/28/2021 / 5:40 a.m. - Crelosa video
The seismic stations reflect activity and OVFGO / Fuego observers report that during the night and early in the morning incandescent pulses that rise from 100 to 200 meters were observed.
Weak and moderate explosions are further reported, in a range of 5 to 12 per hour, expelling gray ash plumes which rise to an average height of 4700 m, generating fine ash falls within a range of 10 to 15 kilometers specifically in the areas of Panimaché 1, Panimaché 2, Morelia, Santa Sofía, El Porvenir, among others. At the same time generating low and moderate rumblings with shock waves.
Constant boulder avalanches were heard in the direction of the Ceniza, Taniluya, Trinidad and Santa Teresa barrancas, some of the material reached the edge of the vegetation.
Sources: Insivumeh & Conred
Piton de La Fournaise - the eruptive site at 12/28/2021 / 07:17 am - IRT / OVPF-IPGP webcam - click to enlarge
The eruption of Piton de La Fournaise, which began on 12/22/2021 at around 3:30 a.m. local time, continues.
Over the last 24 hours, the amplitude of the eruptive tremor (indicator of an emission of lava on the surface) has shown fluctuations, and is this morning at around 50% of its initial amplitude.
The bad weather conditions on the eruptive site present since yesterday at the end of the afternoon, no longer allow visual feedback with the eruption.
Over the last 24 hours:
- Two volcano-tectonic earthquakes under the summit have been recorded.
- Surface deformations no longer show significant deformation.
- No estimate of lava flow could be established by satellite method with the HOTVOLC platform (OPGC - Clermont Auvergne University), following the cloud cover present since yesterday afternoon. - The position of the flow front could not be observed for the same reason.
Alert level: Alert 2-1 (eruption in the enclosure)
Find all the information relating to Piton de la Fournaise's activity on the various OVPF-IPGP media :
- the website: ipgp.fr/fr/ovpf/actualites-ovpf
- the Twitter account: twitter. com / obsfournaise
- the Facebook account: facebook.com/ObsVolcanoPitonFournaise
The eruption continues at the Hunga Tonga Hunga Ha'apai volcano, intermittently, and ash has been detected in all directions up to 30 km.
Tonga's geological survey chief Taaniela Kula said the ash cloud rose to a height of 12 km and the direction of the ash varied with the wind conditions. - Tuesday to the east, Wednesday to the north.
Overall, the amount of ash, steam and gas released from the volcano has decreased compared to last week, Kula said.
No earthquakes had been detected on their seismometers.
Currently, the danger level for falling ash is orange. Although no one has yet reported ashes falling on houses, T. Kula advised the public to take steps to protect their rainwater catchment and storage systems should ash fall.
Source: RNZ & Tonga Meteorological and Coastal Radio Services.
In the Reykjanes Peninsula, since midnight on December 28, around 600 earthquakes have been detected in the region by Fagradalsfjall, much less than yesterday at the same time.
Yesterday, December 27, a magnitude 3.0 earthquake was measured about 2 km west of Kleifarvatn and at 8:25 a.m. a magnitude 3.6 earthquake was measured nearby. These earthquakes are interpreted as earthquakes and their cause is due to the increase in pressure due to the accumulation of magma at Fagradalsfjall.
About 1,500 visitors have made their way to the volcano and lava field on the Reykjanes Peninsula over the past three days, despite warnings that a new eruption could start there with very little warning.
Some people walked on the lava field itself, which police say is totally prohibited.
Sources: IMO update 28.12 / 11.00 a.m., RUV