September 05 , 2016. EN. Katla , Turrialba , Nevados De Chillan , Santiaguito .

Home / blog georges Vitton / September 05 , 2016. EN. Katla , Turrialba , Nevados De Chillan , Santiaguito .

September 05 , 2016. EN. Katla , Turrialba , Nevados De Chillan , Santiaguito .

September 05 , 2016.


Katla , Iceland  :

On the micro-earthquake activity at Mýrdalsjökull
Monitoring statement with regard to the Katla volcano
The following summary by the Icelandic Meteorological Office is about a recent increase in earthquake activity at the ice-covered Katla volcano, Iceland. Media interest in Iceland’s volcanoes has remained high since the Eyjafjallajökull eruption of 2010, hence the summary is intended as an official monitoring statement, in case of diverging media reports.



Micro-earthquake activity

Since mid-June, earthquake activity within the caldera of the ice-covered Katla volcano has increased above background levels. More than 100 shallow-seated earthquakes have been detected in Katla caldera since 1 June 2016, which is almost four times the monthly average compared to previous years. Earthquakes occurred mainly in bursts ranging from minutes to hours, often with 20 events or more. The two largest earthquakes since the unrest began occurred on 26 July at 03:42 and 03:50 UTC, respectively, both with a magnitude of Mw3.2.



© Reynir Ragnarsson
One of many ice-cauldrons in Mýrdalsjökull, which are geothermally formed. Some are aligned above the eastern rim of the Katla caldera, which lurks underneath the ice-cap. In the center of the caldera, the ice is over 500 m thick. Melt water from the surface of the glacier has collected in the bowl, giving the blue colour, but that is irrelevant to the activity discussed in this article.

Such summertime increases in seismicity are common at Katla and the ongoing activity within the caldera is similar to summertime unrest observed in 2012 and 2014. Often this increased seismicity occurred in association with drainage of meltwater from several known ice-cauldrons, formed due to hydrothermal activity, as observed almost annually. Since late June 2016 there have been three small floods in Múlakvísl river, an outlet from Mýrdalsjökull, in addition to a flood from the Entujökull glacier. Presently, water-level and electrical conductivity measurements at the bridge over Múlakvísl show increased drainage of geothermal meltwater from Mýrdalsjökull – the ice-cap overlying Katla. We have received several reports throughout the summer of a hydrogen sulphide stench from glacial rivers around Myrdalsjökull.


Around Katla we are not detecting signs of increased ground deformation or bursts of seismic tremor, which are both signals that might indicate movement of magma. We continue to monitor Katla closely and will issue updates on IMO‘s web-site if the situation intensifies. Our assessment is that the volcano is in a period of summertime unrest and it does not show signs of impending eruption, although we cannot rule-out a sudden escalation in seismicity in connection with a hazardous flood.

Source :


Turrialba , Costa Rica :

Turrialba volcano has remained calm for 2 weeks now

4 SEPTEMBER 2016. The last activity recorded by the National Seismological Network at the University of Costa Rica (UCR) around the Turrialba volcano occurred last August 18.

Since then, the colossus has not had any large eruptions, but that does not mean that they can not come at any time, according to volcanologists of the UCR.



It was last 1st August when the last ash eruption occurred at about 5 am, which which lasted for 11 minutes. The ash plume in this expulsion reached 300 meters.

In the image, Turrialba  , thanks to the camera located in the crater, about 600 meters east of the active crater (facing west), by the Volcanological and Seismological Observatory of Costa Rica (Ovisicori).




Nevados De Chillan, Chile :

Saturday night, the Nevados de Chillan volcanic complex has issued a new eruptive pulse, added to that already held this week.
However, this time , the cameras of the SERNAGEOMIN  showed images of the situation that took place during the night, revealing a rarely seen side of the massif.

nevados de chillan

The institution also reported that the volcano has moderate internal energy, so the level of yellow alert issued on 31 December is maintained.

We expect the next report of SERNAGEOMIN will not be long.

Source :

Photo : Patricio Arias


Santiaguito , Guatemala :

INSIVUMEH and OVSAN maintain their volcanic monitoring on the Santiaguito volcano who continues its explosive activity, with the registration by the seismic station Stg3, of three explosions, two moderate at 00:01 and 0:15, and a strong one at 00h18 raising an cloud mushroom-shaped of ashes to a height about 4500 meters above sea level which is spreading to the South and the East of the volcanic complex.


The pyroclastic flows generated by the loud explosion are descended from the Caliente dome of the Santiaguito volcano by the flanks West – South – West, South and Southeast, mainly in the beds of rivers San Isidro and Nima II, traveling over a distance of ~ 2 km.
Ash falls are likely in the areas of Santa Maria de Jesus, with the possibility of also fall on the farms of El Faro, Patzulin and others. In the coming hours, it could lead to the fall of fine ash in the city of Quetzaltenango.

Source : Insivumeh

Photo : Archive

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