May 25 , 2016. EN. Kilauea , Etna , White Island , Copahue .

Home / blog georges Vitton / May 25 , 2016. EN. Kilauea , Etna , White Island , Copahue .

May 25 , 2016. EN. Kilauea , Etna , White Island , Copahue .

May 25 , 2016.


Kilauea , Hawai :

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
Eruptive activity continues at Kilauea Volcano’s summit and East Rift Zone. At around 6:50 a.m. a lava flow broke out from the northeast flank of Pu’u ‘O’o cone; a second flow also broke out on the east flank of the cone. At the summit, inflationary tilt continued through much of yesterday; however, little change in tilt has occurred overnight. The summit lava lake level has risen slightly since yesterday, and spattering has been intermittently visible from the Jaggar overlook this morning. Scattered lava flow activity continued on the June 27th lava flow field within about 5.8 km (3.6 mi) northeast of Pu’u ‘O’o. None of the Pu’u ‘O’o flows currently pose a threat to nearby communities. A small flurry of deep earthquakes has occurred on the lower part of the southwest rift zone of Kilauea over the past several days. Earthquakes in this area of the rift zone are observed intermittently, and do not represent unusual behavior for Kilauea.


Two new breakouts at Pu’u ‘O’o began this morning just before 7:00 a.m., HST. The larger of the two breakouts, shown here, originated on the northeast flank of the cone, at the site of the vent for the ongoing June 27th lava flow. This breakout point fed a vigorous channelized flow that extended about 1 km (0.6 miles). This lava flow had not extended beyond the existing Pu’u ‘O’o flow field at the time this photo was taken (8:30 a.m., HST).


Summit Observations:
The lava lake within the Halema’uma’u Overlook crater remained active, with the lava lake level measured at around 23 m (75 ft) below the Halema’uma’u crater floor this morning, high enough to view intermittent spattering from the Jaggar overlook. Inflationary tilt continued through much of yesterday, however little change in tilt has occurred since around 9 p.m. last night. Tremor fluctuations associated with lava lake spattering continued. Sulfur dioxide emissions from the summit vent ranged from 4,100 to 7,000 t/d during the past week. These values are typical for active pond conditions. Data from GPS networks and interferometric satellite radar (InSAR) show continued long-term inflation of the summit and upper Southwest Rift Zone magma reservoirs.


A new hornito has formed on the edge of the skylight high on Pu’u ‘O’o’ s north flank.


Pu’u ‘O’o Observations:
At around 6:50 a.m., in concert with sharp deflationary tilt at Pu’u ‘O’o, two lava flows broke out from the flanks of the cone. One is on the northeast flank, approximately 250 m (0.15 mi) from the rim of the cone, heading toward the northwest. The other flow is on the east flank of the cone, approximately 500 m (0.3 mi) from the rim of the cone, heading toward the southeast. At around 8:30 a.m., during an HVO overflight, the flow on the northeast flank was roughly 1 km (0.6 mi) long, and the flow on the east flank was around 700 m (0.4 mi) long, but neither has extended beyond the existing flow field. Typical of new breakouts, the initial flow activity has been vigorous, but neither flow is currently threatening any nearby communities. The floor of Pu’u ‘O’o crater has subsided slightly with the new flow activity. Persistent glow from spatter cones within the crater continues. No change in seismic activity has been noted, and remains low and steady. The sulfur dioxide emission rate from all East Rift Zone vents was about 300 metric tons/day when last measured on May 10.

June 27th Lava Flow Observations:
In addition to the new lava flows on the flanks of Pu’u ‘O’o, surface flow activity on the June 27th flow field continues, with small breakouts scattered northeast of Pu’u ‘O’o where they have been occurring for the past several months. The most distant breakouts were about 5.8 km (3.6 mi) northeast of Pu’u ‘O’o. The flows are not currently threatening any nearby communities.

Source : HVO

Photo : HVO , Bruce Omori.



Etna , Sicily :

Explosions in the crater of the Voragine, on Etna occurred that night. Shortly after the activity has increased significantly and a new episode of intense strombolian activity is ongoing.


Which in the end did not become a real climax; However, continued intense strombolian activity in the Voragine of Mount Etna all night and in  the morning of May 25, 2016.

The tremor this morning is rising again. On the current activity, INGV has not yet reported.

Source : Boris Behncke , INGV.

Photo : Boris Behncke


White Island , New Zealand  :

Volcanic Alert Bulletin WI 2016/07:
8:50am Wednesday 25 May 2016; White Island Volcano

Alert Status:
Volcanic Alert Level remains Level 1
Aviation Colour Code remains Green

The level of volcanic unrest at White Island declined following the eruption. Volcano seismic activity has decreased, while the gas output has been variable and is now at typical background levels. No further eruptions have occurred and the Volcanic Alert Level remains at Level 1. GNS staff visited White Island (Whakaari) last week to continue their evaluation of the eruption impacts, sample gases, collect thermal IR images and undertake maintenance of monitoring equipment affected by the eruption on April 27.


white island

Thermal IR images have established very high temperatures are present on a mound in the back of the 1978/90 Crater. This is the same area where a dome grew in 2012. There are two areas of hot gas output and the temperatures ranged from 292 to 337 ºC. These are the highest temperatures we have measured since early 2014 when we measured 450 ºC in the same area. The April 27 eruption removed about 13-15 m of lake floor sediments and now a new lake is starting to form at this lower level on the floor of the crater; the temperature is 49 ºC. The temperature of Fumarole 0 (the largest accessible one) has increased from 178 to 188 ºC.

white Island

Collapse zone of crater Donald Duck.

LObservations during this visit of the eruption deposits confirm the explosive nature of the April 27 eruption and the complexity. The eruption did produce very energetic blasts and surges. In places it sheared off or broke survey pegs and markers at ground level. Typical of energetic blast and surge events, the deposit is not very thick, ranging from a few mm to 50 mm in thickness. Ballistic blocks were observed in several locations, suggesting more than one source for them. There is also a ‘wet’ surge deposit that is mainly made up of lake floor sediments (muds, sands and sulphur). It is starting to appear the eruption sequence was: the area around the former Donald Duck Crater collapsed and exploded, then the former lake and the sediments in its basin have been erupted forming the blast and surge deposits. This has lowered the lake floor at least 13 m. This was a very energetic phase with both surge and ballistic phases (some post surge). Following this there has been collapse of the 1978/90 Crater walls. Survivability during the eruption would most likely have been low in areas of the Main Crater floor.

The level of volcanic unrest at White Island (Whakaari) declined quickly following the eruption on April 27. The Volcanic Alert level for White Island remains at Level 1. Aviation Colour Code remains Green. GNS Science volcanologists continue to closely monitor White Island through the GeoNet project.

Source : Geonet , Steve Sherburn
Duty volcanologue


Copahue , Chile :

The level of activity of the volcano is at: YELLOW: changes in the behavior of volcanic activity, probable time for an eruption: -Time / weeks / months.
The National Service of Geology and Mining (SERNAGEOMIN) and national volcano monitoring network (RNVV) through the Volcanological Observatory of Southern Andes (OVDAS), based on the analysis of information obtained by the monitoring equipment and surveillance of the volcanic complex, announces:


During this period 241 seismic events (241) thirty-four of which (34) were classified as volcano – tectonic (VT) associated with rigid material fracturing process were recorded. Similarly, two hundred and seven (207) events associated with the fluid dynamics inside the volcano and identified as volcanic earthquakes long period (LP) and very long period (VLP) were recorded.

copahueRegarding seismic activity VT, local magnitudes (ML) are less than or equal to M2,0. The event‘s largest into energy was located on the North-East side, at 11,3km from  El Agrio  crater with a depth of about 6.8 km.
As regards the events related to fluid dynamics (LP), these events had a local magnitude (ML) below M1,5 and reduced displacement (RDC) less than 4.7 cm2, while events VLP showed local magnitude (ML) of less than M1.6   and reduced displacement (DRC) below 21,5cm2, these events were located around the active crater.

-During The month, there was a constant tremor signal, primarily associated with the release of particulate matter (gas and ash) from the crater EL Agrio, which recorded values of DRC oscillating, generally less than 2cm2, values considered low for this volcano. The dominant frequencies are concentrated in a bandwidth between 0.5 and 1.5 Hz.

From the data obtained from the four (4) GNSS stations, trying to measure the surface deformation of the volcano, it was observed that the horizontal and vertical components showed small-scale variations.
The sulfur dioxide emissions (SO2) recorded on the Copahue volcano by the team DOAS (Differential Optical Absorption Spectrometry) Triplets Station, located 5 km to the east-northeast (ENE) of the active crater, presented a mean value of 640 ± 268 t / day and a maximum of 1 775 t / day recorded on May 3 The average flow is considered at moderate levels for this volcano.
IP cameras installed near the volcano recorded the constant emission of material from the active crater (El Agrio), mainly whitish degassing accompanied by incandescence. These emissions were characterized by mostly a gray color, showing the presence of particulate material.

Source : Sernageomin

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