March 28, 2020. EN. Indonesia : Merapi , Alaska : Shishaldin , Colombia : Nevado del Huila , Ecuador : Sangay , Guatemala : Fuego .
March 28 , 2020.
Indonesia , Merapi :
VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA.
Issued: March 27 , 2020.
Volcano: Merapi (263250)
Current Aviation Colour Code: ORANGE
Previous Aviation Colour Code: orange
Source: Merapi Volcano Observatory
Notice Number: 2020MER08
Volcano Location: S 07 deg 32 min 31 sec E 110 deg 26 min 31 sec
Area: Special Region of Yogyakarta, Indonesia
Summit Elevation: 9498 FT (2968 M)
Volcanic Activity Summary:
Eruption with volcanic ash cloud at 22h21 (05h21 UTC).
Volcanic Cloud Height:
Best estimate of ash-cloud top is around 15898 FT (4968 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer.
Other Volcanic Cloud Information:
Ash coud moving to west
Eruption recorded on the seismogram with amplitude max 50 mm and 180 second duration. Eruption has stopped.
Press release on the Merapi volcano eruption on March 28, 2020
After the March 27, 2020 eruption at 10:46 a.m., on Mount Merapi, eruptions occurred again on March 27, 2020 at 9:46 p.m. and March 28, 2020 at 5:21 a.m. These eruptions each produced a column height of 1000 m and 2000 m. Seismographs record eruptions with amplitudes of 40 mm and 50 mm each lasting 180 seconds. No hot cloud was observed during these eruptions. A VONA message (Volcano Observatory Notice for Aviation) is published in orange. The wind when the eruption is oriented to the West. Light ash rains have been reported within 5 km of the summit of Mount Merapi, particularly in the western sector reaching the Krinjing sub-district in the Magelang regency.
The seismicity after the March 27, 2020 eruption at 10:46 a.m. Western Indonesia time was dominated by LF-type earthquakes, which were recorded 24 times, 11 emission earthquakes, two earthquakes avalanche terrain and 2 MP type events. The deformation does not show significant changes. These observational data show that as the eruption approached, a fluid was moving towards the surface, but the pressure was not strong enough because the material of the eruption was dominated by volcanic gas.
This type of eruption can still occur, indicating that the supply of magma to the magma chamber is still in progress. The danger of these eruptions is present in the form of hot clouds and volcanic material emissions with a range <3 km based on the volume of the dome of 291,000 m3 based on the drone data of February 19, 2020.
Communities must remain calm and do their activities as usual outside the 3 km radius around the summit of Mount Merapi.
Source : Magma Indonésie , BPPTKG.
Vidéo : CCTV Via Rita Bauer.
Photo : BPPTKG.
Alaska , Shishaldin :
54°45’19 » N 163°58’16 » W
Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Seismicity remains elevated at Shishaldin, with continuous low-level tremor recorded over the past week. A weak gas plume was commonly seen in webcam images when views were clear, and elevated surface temperatures were observed in satellite images. Eruptive activity appears confined to the summit area during this most recent period of unrest, which started mid-March. Activity could increase with little or no warning, however, resulting in lava flows outside of the crater, lahars, and ash emissions.
Photo of Shishaldin Volcano taken on an Alaska Airlines flight from Adak to Anchorage, Alaska on March 22, 2020. Steaming from the summit crater is seen.
Shishaldin is monitored by local seismic and infrasound sensors, satellite data, web cameras, a telemetered geodetic and tilt network, and distant infrasound and lightning networks.
Shishaldin volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 16 km (10 mi). A 200-m-wide (660 ft) funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 24 confirmed eruptions since 1775. Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft above sea level.
Source : AVO Alaska .
Photo : McConnell, Angela.
Colombia , Nevado del Huila :
Nevado del Huila volcano weekly activity bulletin
The activity level of the volcano continues at the Yellow activity level or (III): changes in the behavior of volcanic activity.
According to the analysis and evaluation of information obtained by the monitoring network of the Nevado del Huila volcano during the week of March 17 to 23, 2020, the COLOMBIAN GEOLOGICAL SERVICE – Vulayological and Seismological Observatory of Popayán reports that:
During the period evaluated, a total of 405 seismic events were recorded, of which 175 were linked to rock fracturing processes (VT type) and 230 with fluid dynamics in volcanic conduits, among these, 225 have been cataloged. as long period type events (LP type) and five (5) as tremor pulses (TR) with low energy.
The images obtained during the week via the webcams of Caloto, Tafxnú, Maravillas and La Palma showed little degassing of the volcanic system.
The sensors for monitoring soil deformation, magnetic fields and infrasound waves did not record variations associated with changes in volcanic activity.
Therefore, it is concluded that during the evaluated period, the volcano continued to show stable behavior. The Colombian Geological Survey continues to monitor the evolution of the volcanic phenomenon and will report any changes that may occur in due course.
Source et photo : SGC.
Ecuador , Sangay :
DAILY REPORT ON THE ACTIVITY OF SANGAY VOLCANO, Friday March 27, 2020.
Surface activity level: High, Surface trend: No change.
Internal activity level: High, Internal trend: No change.
Seismicity: From March 26, 2020, 11:00 a.m. to March 27, 2020, 11:00 a.m .:
Long Period Type (LP): 17 events
Explosions (EXP): 142 events.
Rains / lahars: No rain was recorded in the area.
** In the event of heavy rain, the accumulated volcanic material can be remobilized, generating mudslides and debris (secondary lahars) in the Volcán, Upano and other tributary rivers.
Emission / ash column: Yesterday afternoon and early morning using satellite images shared by the Washington VAAC, 2 emission alerts were reported in a north direction, with an approximate height of 870 meters above the level of the crater.
Other monitoring parameters: No changes.
Observations: At the moment, the area is completely cloudy.
Alert level: yellow.
Source : IGEPN.
Photo : John Arellano.
Guatemala , Fuego :
Type of activity: Vulcanian
Morphology: composite stratovolcano
Location: 14 ° 28’54˝ Latitude N; 90 ° 52’54˝ Longitude W
Atmospheric conditions: Clear
Wind: North at 5 km / h
Precipitation: 0.0 mm.
Presence of degassing fumaroles of white / blue color at a height of 4200 m above sea level moving towards the Southwest. 7 to 10 low to moderate explosions are generated per hour which eject columns of gray ash at a height of 4400 to 4600 m above sea level (14435-15090 feet) which are dispersed over 10 to 15 km towards the South and South- Where is . In the evening and early morning, incandescent pulses were observed at 250 – 300 m height with strong avalanches around the crater, mainly towards the Seca, Taniluya, Ceniza, Trinidad and Las Lajas ravines. Moderate to loud rumblings are perceived which cause moderate shock waves perceptible at 25 km distance. There are sounds similar to those of train locomotives with intervals of 1 to 2 minutes, as well as falls of fine particles of ash in Panimache II, Panimache I, Palo Verde and others.
Source : Insivumeh .
Photo : Massoud Ufo Jorge via facebook .