July 28 , 2016. EN. Chikurachki , Katla , Nevado Del Ruiz , Mauna Loa , Kilauea .

Home / blog georges Vitton / July 28 , 2016. EN. Chikurachki , Katla , Nevado Del Ruiz , Mauna Loa , Kilauea .

July 28 , 2016. EN. Chikurachki , Katla , Nevado Del Ruiz , Mauna Loa , Kilauea .

July 28 , 2016.


 Chikurachki , Northern Kuriles, Russia :


Volcano: Chikurachki
Current Aviation Color Code: ORANGE
Previous Aviation Color Code: green
Volcano Location: N 50 deg 19 min E 155 deg 27 min
Area: Northern Kuriles, Russia
Summit Elevation: 5956.48 ft (1816 m)



Volcanic Activity Summary: According to Tokyo VAAC data, eruption of Chikurachki volcano began. Satellite data by KVERT show an ash plume is raising up to 4-5 km a.s.l. and extending for about 100 km to the northeast from the volcano.
Ash explosions up to 19,700-26,240 ft (6-8 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

Chikurachki, the highest volcano on Paramushir Island in the northern Kuriles, is actually a relatively small cone constructed on a high Pleistocene volcanic edifice. Oxidized basaltic-to-andesitic scoria deposits covering the upper part of the young cone give it a distinctive red color. Frequent basaltic plinian eruptions have occurred during the Holocene. Lava flows from 1781-m-high Chikurachki reached the sea and form capes on the NW coast; several young lava flows also emerge from beneath the scoria blanket on the eastern flank.



The Tatarinov group of six volcanic centers is located immediately to the south of Chikurachki, and the Lomonosov cinder cone group, the source of an early Holocene lava flow that reached the saddle between it and Fuss Peak to the west, lies at the southern end of the N-S-trending Chikurachki-Tatarinov complex. In contrast to the frequently active Chikurachki, the Tatarinov volcanoes are extensively modified by erosion and have a more complex structure. Tephrochronology gives evidence of only one eruption in historical time from Tatarinov, although its southern cone contains a sulfur-encrusted crater with fumaroles that were active along the margin of a crater lake until 1959.

Source : Kvert , GVP.

Photo : M. Karasev, L Kotenko.


Katla , Iceland :

When will she blow? Iceland’s vicious Katla volcano rumbles.

26 JULY 2016. Two earthquakes of magnitude 3.2 occurred in the Katla caldera in Mýrdalsjökull glacier around 4:00 AM this morning. Ten smaller earthquakes followed. Katla is one of Iceland’s largest volcanoes, and with twenty eruptions being documented since the year 930, Katla remains on of the country’s most active volcanoes.


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Le glacier Mýrdalsjökull  .


Scientists at the University of Iceland Institute of Earth Sciences Sciences (IES) and the Icelandic Met Office have been monitoring activity at Katla lately, but small glacial river floods have been observed in recent weeks in the Múlakvísl river that flows from underneath the glacial cap. The floods are caused by Katla’s geothermal hot spots under the Mýrdalsjökull glacier in South Iceland.
“This seems to be an annual occurrence, but we still have a reason to closely monitor the situation,” says Dr. Páll Einarsson, geophysicist at the IES.
“The last large eruption in Katla was in 1918, but in the meantime there have been three events that indicate volcanic activity underneath the glacier. First in 1995, then in 1999 and most recently in 2011 when a glacial flood in Múlakvísl river took out a bridge on the main road,” says Dr. Einarsson.
“All of these incidents share some similarities, there were earthquakes, rumbles, and glacial floods. There are signs that suggest that small volcanic eruptions did take place underneath the glacier but they were not large enough to break through the icecap. The icecap is fairly thick and only a large eruption would manage to break to the surface.”



Katla is not overdue, still unpredictable.

Katla has not erupted for some time and some locals believe the volcano is long overdue. Dr. Einarsson points out that volcanoes do typically not erupt at a certain intervals and any talk of Katla being overdue is misleading.
“Katla seemed to be fairly predictable for the past three hundred years, but it erupted twice a century, typically in the 20s and 60s,” Dr. Einarsson says, but the volcano erupted in 1625, 1660, 1721, 1755, 1823, 1860 og 1918. “This perceived predictability led people to expect a large eruption in around 1960, but we’re still waiting for it. Volcanoes are unpredictable,” he adds.

How bad would it be?

How bad will it be if Katla erupts? The Katla eruption in 1918 produced an enormous ash cloud and five times as much ash as the 2010 Eyjafjallajökull eruption that halted air traffic in the North-Atlantic and across Europe. Such a large eruption is likely to disrupt air traffic and cause destruction of property and local infrastructure.
In addition to an ash cloud, large eruptions in Katla are accompanied by enormous floods when melted snow and glacial water, mixed with mud and pieces of ice, break out from underneath the icecap and flow to sea. In the last large eruption in 1918, the Southern coast was extended by 5 km by the laharic flood deposits.

The most likely path of such a flood is to the South across Mýrdalssandur area, an unpopulated area east of the town Vík in Mýrdalur.


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 Hekla volcano .

And then there is Hekla.

Katla is not the only volcano in Iceland that Dr. Einarsson and his colleagues are keeping a close eye on. As we reported last month, Hekla in South Iceland could erupt at any moment and people are advised not to travel up the mountain.


Photos :   Ulrich Latzenhofer , Tony Warelius.


Nevado Del Ruiz , Colombia :

Activity bulletin of the Nevado del Ruiz volcano.

The level of activity continues at:
Activity level Yellow or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the Nevado del Ruiz volcano, the Colombian Geological Service reports that:

During last week, the volcano Nevado del Ruiz, compared to the previous week  , recorded an slightly increased , both in seismic activity associated with the fracturing of the rock inside the volcano and in fluid dynamics in volcanic conduits.

Earthquakes associated with the fracturing of the rock inside the volcano, were mainly in the seismogenic zones of the South-West, North West, North distal and, to a lesser extent in the proximal areas North, Northeast and near the Arenas crater at depths between 0.8 and 8.0 km. The earthquake of greatest energy was presented on July 21 at 1:07 (local time) with a maximum magnitude of 1.9 ML (local magnitude) at a depth of 2.5 km, and located in the  sector South -South West compared to the Arenas crater. An increase took place on 22 July, which was located in the northwest sector compared to the Arenas crater at depths between 4.7 and 5.1 km. The most energetic earthquake of this increase was at 0.5 ML (local magnitude).

nevado del ruiz

Seismic activity related to fluid dynamics in volcanic conduits, was characterized by the appearance of long period earthquakes (LP) and very long period (VLP), pulses of tremors and multiple earthquakes of fluid with different energy levels. Some of the seismic signals were associated with gas and ash emissions  into the atmosphere. A slight increase of the recording of pulses of tremor with different energy levels and a decrease in the recording episodes of continuous volcanic tremors, the latter having continued to have low energy levels is highlighted. The registration of new seismic signals of this type with higher energy levels, which can be associated with gases and ash into the atmosphere, which can be dispersed according existing wind conditions in the region is not excluded.

nevado del ruiz

The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images to track changes in the tilt, the position and shape of the volcano, respectively, continued to record Changes.
The volcano continues to emit into the atmosphere large amounts of steam and water gas, including sulfur dioxide (SO2), which is distinguished as it was estimated by the permanent stations SCANDOAS installed in the region of the volcano and satellite imagery. In the monitoring of satellite images provided by the site Mirova, no thermal anomaly has been identified.

The column of gas, steam and ash reached a height of 1900 m above the top of the volcano, on July 26. The direction of the dispersion of the column was in compliance with the prevailing wind in the area, which during the week showed a predominant direction towards the northwest of the volcano, promoting the dispersion of the ash on people who are in these directions.

Source : SGC / Ingeominas


Mauna Loa , Kilauea , Hawai :

19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Activity Summary:
Rates of deformation and seismicity at Mauna Loa remain above long-term background levels.

Mauna Loa is not erupting. In the past week, earthquakes at Mauna Loa occurred beneath the west and north flanks of the volcano mostly in the 5 – 11 km (3 – 7 miles) depth range. In addition, earthquakes are occurring in south caldera and upper Southwest Rift Zone at depths less than 5 km (3 mi). Global Positioning System (GPS) measurements show deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone, with inflation occurring mainly in the southwestern part of the magma storage complex.



Lava Flow Observations:
The 61G lava flow extending southeast of Pu’u’O’o towards the coastal plain on Kilauea’s south flank remains active. The 61G lava flow extending southeast of Pu’u’O’o entered the ocean, as of 1:12 a.m. HST yesterday. It is currently 20 m (66 ft) wide where it spills over the sea cliff. Another narrow lobe of the flow has advanced along the west margin of the main flow. Areas of incandescence remain visible in overnight webcam views of the active lava flow field, marking lava tube skylights and areas of active lava on the pali and along the flow as it extends towards the coast.

Source : HVO

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