January 11 , 2021.
Russia / Kurile Islands , Sarychev Peak :
VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA).
Issued: January 11 , 2021
Volcano: Sarychev Peak (CAVW #290240)
Current aviation colour code: YELLOW
Previous aviation colour code: green
Source: KVERT
Notice Number: 2021-07
Volcano Location: N 48 deg 5 min E 153 deg 12 min
Area: Central Kuriles, Russia
Summit Elevation: 4906.88 ft (1496 m)
Volcanic Activity Summary:
Activity of Sarychev Peak volcano increased: according to the NPP(VIIRS, ch 4) satellite data from the VolSatView IS, at 15:17 UTC on 10 January, the difference between the temperatures of the anomaly and the background was 79.8 ° С. Perhaps a new lava has appeared in the crater of the volcano. Ash explosions could occur at any time. According to satellite data, ash explosions up to 4.5 km a.s.l. were noted last time on 12, 14, and 18 September, 2018. KVERT continues to monitor Sarychev Peak volcano.
A moderate gas-steam activity of the volcano continues. Ash explosions up to 32,800-49,200 ft (10-15 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
A state of Peak Sarychev volcano after a strong eruption on June 12-15, 2009: pyroclastic deposits covered all volcanic flanks.
Sarychev Peak, one of the most active volcanoes of the Kuril Islands, occupies the NW end of Matua Island in the central Kuriles. The andesitic central cone was constructed within a 3-3.5-km-wide caldera, whose rim is exposed only on the SW side. A dramatic 250-m-wide, very steep-walled crater with a jagged rim caps the volcano. The substantially higher SE rim forms the 1496 m high point of the island. Fresh-looking lava flows, prior to activity in 2009, had descended in all directions, often forming capes along the coast. Much of the lower-angle outer flanks of the volcano are overlain by pyroclastic-flow deposits. Eruptions have been recorded since the 1760s and include both quiet lava effusion and violent explosions. Large eruptions in 1946 and 2009 produced pyroclastic flows that reached the sea.
Source : Kvert , GVP.
Photo : A. Rybin, IMGG FEB RAS ( 07/2009)
Saint Vincent and the Grenadines , Soufrière Saint Vincent :
LA SOUFRIÈRE BULLETIN , JANUARY 10, 2021 8:00 PM
Weather conditions did not allow for a reconnaissance flight on Saturday 9th January or Sunday 10th January, 2021, however analysis of footage collected from a drone flight over the volcano on Saturday 9th January indicate that the drone continues to grow.
The dome that broke through the crater floor, on December 27, 2020, on the south-west perimeter of the existing dome, continues to grow within the crater of La Soufrière and has an ellipsoid shape with growth expanding in a westerly direction.
Alert level remains at Orange. The volcano continues to exude magma on the surface and steam can still be observed from the Belmont Observatory. Persons living in areas close to the volcano should expect strong sulphur smells for several days to weeks, depending on changes in wind direction.
Two scientists from the Seismic Research Centre (SRC) based at the Montserrat Volcano Observatory (MVO), Dr. Thomas Christopher and Dr. Adam Stinton, will join the current team here in St. Vincent later this week. They are expected to gather data from the dome and crater through temperature and photogrammetry measurements and gas measurements using a MultiGAS and spectrometer.
View from crater rim. The vegetation on the 1979 dome and crater floor is being impacted by the volcanic gases and material being ejected
The Caribbean Disaster Emergency Management Agency (CDEMA) is finalising helicopter support for the Seismic Research Centre (SRC) Team to install equipment and collect samples from the summit of the volcano.
The SRC Team commenced installation of Seismic station in Owia today and will continue installation in Fancy and areas closer to the volcano during the course of this week.
Installation of a GPS station at Georgetown was successful, with a total of three stations currently streaming data to SRC.
The continuing hotspot anomaly being recorded by NASA FIRMS results from the presence of the new dome. Satellite imagery obtained through the Monitoring Unrest from Space (MOUNTS) Project indicate that the dome is detectable by orbiting earth satellites.
The National Emergency Management Organisation is reminding the public that no evacuation order or notice has been issued.
Source et photos : Nemo .
New Zealand , Ruapehu :
Activity decreases at Mt Ruapehu. The Volcanic Alert Level is lowered to 1. Published: Mon Jan 11 2021 2:15 PM
Volcanic Alert Level is lowered to 1
Aviation Colour Code is lowered to Green
General activity at Mt Ruapehu has decreased over the past two weeks. Volcanic gas emissions are back to normal levels and volcanic tremor declined. While the crater lake temperature remains high, the period of moderate to heightened volcanic unrest has now ended. The Volcanic Alert Level at Mt Ruapehu is lowered to Level 1.
On 30 December 2020, we observed that the volcanic gas emissions from Ruapehu had declined to normal levels, from the highs observed in mid-December. On 29 December 2020, volcanic tremor, which had previously been slightly elevated following a volcanic earthquake on 26 December 2020, declined to a low level, and has remained low. Chemical analysis of water collected from Crater Lake (Te Wai ā-moe) on 31 December 2020 showed only small changes in key parameters since previous observations a few weeks earlier on 2 December 2020. While the temperature of the water in Crater Lake (Te Wai ā-moe) remains high, at 40 ºC, taking all of the observations into consideration, the period of moderate to heightened volcanic unrest is now judged to have ended.
The temperature of water in Crater Lake (Te Wai ā-moe) reached a maximum of 43 ºC on 21 December 2020, and in the last three weeks has declined to 40 ºC. Our modelling shows that ~200 MW (megawatt) of heat is still entering the lake; this heat is expected to lag behind the high gas emissions observed in mid-December, so the slow decline in lake temperature is expected.
The key parameters in our interpretation of the reduced unrest at Ruapehu are the low volcanic gas emission rate, the reduced level of volcanic tremors, and the small changes in lake water chemistry. Because these three parameters have either lowered or shown only small changes, the continuing high temperature of water in Crater Lake (Te Wai ā-moe) is not of concern, and therefore the Volcanic Alert Level is lowered to Level 1.
In the next 1-2 weeks, if weather conditions permit, we will make a further observation of volcanic gas emissions, and collect a new water sample from Crater Lake (Te Wai āmoe) for chemical analyses. Together with our real-time data sets (seismic, ground deformation, and visual observations), these will help us monitor what we expect to be a slow decline in lake temperature.
The Volcanic Alert Level should not be used to forecast future activity, however at Volcanic Alert Level 1, eruptions are less likely than at Volcanic Alert Level 2.
Volcanic Alert Level 1 indicates the primary hazards are those expected during volcanic unrest: steam discharge, volcanic gas, earthquakes, landslides and hydrothermal activity. While Volcanic Alert Level 1 is mostly associated with environmental hazards, eruptions can still occur with little or no warning.
Source : Geonet / Steven Sherburn , Duty Volcanologist .
Photos : Webcam , Brad Scott /GNS.
Indonesia , Sinabung :
Karo Regional Disaster Mitigation Agency (BPBD) acting chief Natanail Perangin-angin reported that Mount Sinabung in Karo, North Sumatra, erupted again on Sunday, Jan. 10, at around 12:01 Western Indonesian Time (WIB). Yet the agency did not record the height of the ash column.
The previous eruption occurred last year on Dec. 28. Recently on Sunday, Jan. 3, the volcano with its peak about 3,460 meters above sea level erupted again.
“The eruption was recorded on a seismogram with a maximum amplitude of 44 mm for approximately 3 minutes and 5 seconds,” said Natanail in Medan on Sunday.
The volcano has been thus far at Level III (Alert) status. Residents and farmers were restricted from carrying out any activities in villages that had been relocated or within a 3-kilometer radius of the mountain summit, a 5-km radius for the south-east sector, and a 4-km radius for the east-north sector.
Source : Tempo .
Photo : Sadrah Peranginangin .
