The Buenos Aires VAAC reported that on 26 November diffuse steam-and-gas emissions from Copahue, recorded by the ODVAS webcam and satellite images, possibly contained a small amount of ash. The plume rose to altitudes of 3.4-3.7 km (11,000-12,000 ft) a.s.l. and drifted 65 km E.
The volcano remains restless. Intermittent small to moderate ash emissions from the El Agrio crater and night-time glow continue to be observed at the volcano.
The Buenos Aires VAAC reported that during 15-16 November diffuse steam-and-gas emissions from Copahue recorded by the ODVAS webcam contained a small amount of ash.
Ash emissions from Copahue 4 Nov 2014
Light ash emissions occurred yesterday from the volcano. Glow continues to be visible from the crater at night.
Glow from the crater of Copahue on 27 Oct (image: SERNAGEOMIN)
Signs of unrest at the volcano have decreased and SERNAGEOMIN lowered the alert level back to yellow:
Ash emission from Copahue last evening
Although activity has decreased a bit, intense degassing and sporadic small ash emissions as well as crater glow continue at the volcano.
On 24 October SERNAGEOMIN reported a continuing downward trend of seismicity at Copahue and that emissions had become more diffuse with only minute amounts of tephra in some plumes. A small mud lake had also formed in the crater. SERNAGEOMIN lowered the Alert Level to Yellow and recommended no entry into a restricted area within 3 km of the crater.
SERNAGEOMIN reported that on 15 October gray ash plumes rose 300 m above Copahue's El Agrio Crater and four explosions were recorded. Plumes on 17 October were generally white and rose 100 m; no explosions were detected. Seismicity was low on 18 October.
Sat, 11 Oct 2014, 22:44
Explosive activity at Copahue - sequence of the second explosion yesterday (Images: SERNAGEOMIN, annotation: Culture Volcan)
Activity has picked up at the volcano: at least two moderately strong explosions occurred yesterday 11 Oct at 06:25 and 14:53 local time, with ash plumes rising more than 1000 m. In addition, intermittent incandescence from the crater has been visible during the night 10-11 Oct.
Read allWed, 8 Oct 2014, 08:40
Ash emissions from Copahue volcano on 6 Oct 2014 (SERNAGEOMIN)
A new phase of ash emissions began on the evening of 4 Oct. The volcano started to emit near continuous ash plumes, interrupted by strong degassing phases, from the active El Agrio crater. Seismic activity according to SERNAGEOMIN has been low suggesting that the origin of the new eruptions is phreatic, i.e. driven by steam explosions rather than fresh magma rising to the surface.
Read allWed, 8 Oct 2014, 06:00
SERNAGEOMIN reported that two explosions from Copahue's El Agrio Crater occurred at 0752 and 1349 on 11 October, and generated dark gray ash plumes that rose at most 3.6 km above the crater. Some minor explosions were detected after the second explosion. Incandescence in the vicinity of the crater was observed at night.
Read allWed, 1 Oct 2014, 06:00
The Buenos Aires VAAC reported that during 6-7 October diffuse steam-and-gas emissions from Copahue detected in satellite images contained a small amount of ash. The webcam showed that the emission source was near the summit.
Read allWed, 24 Sep 2014, 06:00
On 26 September a special volcanic activity report issued by OVDAS-SERNAGEOMIN noted a seismic swarm at Copahue; between 1600 and 1900 the seismic network recorded 140 long-period events. Cameras near the volcano recorded increased emissions; mostly white plumes with some ash rose 200-500 m and drifted SE. The report also noted that swarms had been recorded in late July and during 1-16 September.
Read allWed, 10 Sep 2014, 06:00
On 14 September SERNAGEOMIN reported elevated seismicity from Copahue. A seismic swarm occurred during 1200-1900 comprising 389 LP earthquakes; epicenters were within the crater area and hypocenters were at depths less than 3 km. SERNAGEOMIN noted that this unrest was similar to that from May and October 2013.
Read allWed, 9 Jul 2014, 06:00
SERNAGEOMIN reported that a phreatic explosion from Copahue occurred at 2023 on 4 July that deposited bombs (less than 12 cm in diameter), lapilli (less than 4 cm), ash, and gray clay smelling strongly of sulfuric acid along the E flank of the crater. During an overflight on 7 July, OVDAS officials observed the deposit and measured a moderate amount of gas emissions (an average of 4,000 tons per day of SO2), a relatively low level of water in the crater, and low temperatures of the fumaroles within El Agrio crater. DOAS stations had measured up to 18,000 tons/day of SO2 on the day of the explosion.
Read allWed, 2 Apr 2014, 06:00
On 4 April OVDAS-SERNAGEOMIN reported that activity at Copahue continued to fluctuate at an elevated level however did not indicate an impending eruption. The Alert Level was lowered to Yellow.
Read allWed, 26 Mar 2014, 06:00
OVDAS-SERNAGEOMIN reported that cameras installed around Copahue recorded white gas plumes rising 100-600 m above the crater during 25-29 March; clouds prevented observations on 30 March. Sulfur dioxide measurements in tons per day were 270 on 26 March, 1,400 on 27 March, 2,000 on 28 March, 1,400 on 29 March, and 920 on 30 March. The Alert Level remained at Orange.
Read allFri, 21 Mar 2014, 18:58
Copahue volcano, quiet at the surface, today (SERNAGEOMIN webcam)
SERNAGEOMIN raised the alert level of the volcano to orange yesterday after an increase in seismic activity. A pulse of volcanic tremor was detected that could indicate magma moving into the volcano's plumbing system.
Read allWed, 19 Mar 2014, 06:00
OVDAS-SERNAGEOMIN reported that a gradual increase of volcanic tremor was detected at Copahue starting at 0230 on 20 March; from 0230 to 1100 the signal fluctuated and intense periods lasted up to 3 hours. Cameras showed minimal activity at the surface while concentrations of sulfur dioxide increased. The Alert Level was raised to Orange.
Read allWed, 12 Mar 2014, 16:06
The volcano continues to show signs of unrest. A swarm of volcanic-tectonic earthquakes occurred the day before yesterday. SERNAGEOMIN keeps the alert level of the volcano at Yellow.