July 26, 2021. EN. Democratic Republic of Congo : Nyiragongo , Kamchatka : Sheveluch , New Zealand : White Island , Indonesia : Semeru , Ecuador : Reventador .

July 26 , 2021.

Democratic Republic of Congo , Nyiragongo :

New Zealand , White Island :

Continued heat flow and changes in gas composition indicate increased unrest at Whakaari/White Island. Volcanic Alert Level raised to Level 2. Published: Mon Jul 26 2021 2:30 PM

Volcanic Alert Level is raised to 2
Aviation Colour Code is raised to Yellow

Persistent observations of night glow on the web cameras indicate continued emission of high-temperature gases. Continued decline of the carbon dioxide to sulphur dioxide ratio points to ongoing degassing of fresh magma. The Volcanic Alert Level has been raised to 2 and the Aviation Colour Code to Yellow. This also acknowledges the uncertainty about what is driving current activity at the volcano.

Elevated levels of gas emissions continue but the ratio of carbon dioxide to sulphur dioxide has decreased. A more detailed evaluation of this observation supports the presence of magma at shallow depth.

Last week’s observation and thermal infrared (IR) measurement flight reported very hot gas (498 to 654°C) being emitted from some of the vents on the 2019 lava extrusion.

The observation of night glow on our web cameras has continued since June 30 and is ongoing.

Tremor and volcano-seismicity has remained low and ground deformation shows an overall pattern of subsidence, with some variability.

There is still large uncertainty about the mechanisms driving the current activity. Most scenarios are consistent with a slightly increased level of unrest at Whakaari/White Island and we have therefore raised the Volcanic Alert Level to 2 (moderate to heightened unrest) and the Aviation Colour Code to Yellow. There are no obvious signs of eruptive activity.

The Volcanic Alert Level reflects the current level of volcanic unrest or activity and is not a forecast of future activity. While Volcanic Alert Level 2 is mostly associated with volcanic unrest hazards (including discharge of steam and hot volcanic gases, earthquakes, landslides and hydrothermal activity), potential for eruption hazards also exists and eruptions can still occur with little or no warning.

GNS Science and the National Geohazards Monitoring Centre continue to monitor Whakaari for further changes in unrest.
Our monitoring equipment has degraded to the point we can no longer provide real-time monitoring of Whakaari/White Island.

We are relying on satellite data, inconsistent GPS data, regular gas and observation flights (weather permitting) and two webcams, one of which is significantly degraded.

We are continuing to work on options to restore our monitoring ability.

Source : Geonet /Yannik Behr / Duty Volcanologist .

Photos : Geonet .

Indonesia , Semeru :

VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA

Issued : July 25 , 2021
Volcano : Semeru (263300)
Current Aviation Colour Code : ORANGE
Previous Aviation Colour Code : orange
Source : Semeru Volcano Observatory
Notice Number : 2021SMR42
Volcano Location : S 08 deg 06 min 29 sec E 112 deg 55 min 12 sec
Area : East java, Indonesia
Summit Elevation : 11763 FT (3676 M)

Volcanic Activity Summary :
Eruption with volcanic ash cloud at 07h20 UTC (14h20 local).

Volcanic Cloud Height :
Best estimate of ash-cloud top is around 13683 FT (4276 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer.

Other Volcanic Cloud Information :
Ash cloud moving to southwest

Remarks :
Seismic activity is characterized by eruption, avalanche and gas emission earthquakes

The level of activity has been level II (WASPADA) since May 2, 2012. Mount Semeru (3,676 m above sea level) has experienced intermittent eruptions. There are explosive and effusive eruptions, producing lava flows towards the southern and southeastern slopes, as well as projections of incandescent rocks around the summit crater.
The volcano is clearly visible until it is covered by fog. No smoke from the crater was observed. The weather is sunny to cloudy, the winds are weak to moderate in the North, North-East, South and South-West. The air temperature is around 21-29 ° C.

According to the seismographs of July 25, 2021, it was recorded:
59 earthquakes from explosions / eruptions
7 earthquakes of emissions
8 harmonic tremors
2 distant tectonic earthquakes

Source : Magma Indonésie , PVMBG.

Photo : M. Rietze , wikipedia , licence creative common .

Ecuador , Reventador :

DAILY REPORT OF THE STATE OF THE REVENTADOR VOLCANO, Sunday July 25, 2021.

Information Geophysical Institute – EPN.

Surface activity level: High, Surface trend: No change.
Internal activity level: Moderate, Internal trend: No change.

Seismicity: From July 24, 2021, 11: 00h to July 25, 2021, 11: 00h:

Explosions (EXP): 54 events
Long period type events (LP): 45
Emission tremor (TREMI): 5.
Harmonic Tremor (TRARM): 1.

Rains / lahars: There has been no rain in the area for the past 24 hours.

Emission / ash column: During the afternoon and night of yesterday several emissions of steam, gas and ash were observed up to a height of 1000 m and directions of dispersion oscillating between the North East and North West.

Other monitoring parameters: No thermal alerts have been recorded in the last 24 hours.

Observations: Last night, an incandescence was observed in the crater. During the morning the area remained cloudy

Alert level: Orange.

Source et photo : IG-EPN