Copahue volcano news & activity updates
Copahue volcano (Chile / Argentina): seismic swarm increases likelihood of new eruptions
mercredi janv. 23, 2013 11:05 | AUTEUR : T
Seismic activity increased significantly during 22 Jan, SERNAGEEOMIN reported in two special bulletins. No eruptive activity at the surface has occurred so far, and the official alert level of the volcano remains at "Yellow", but with "Special Attention" (corresponding to "orange" in our classification).
Until 09:56 local time (12:56 GMT) on 22 Jan, seismic activity had remained at low levels, both in occurrence of earthquakes, the energy released and the signal intensity of tremor associated with fluid movements inside the volcano. Then, at that time, there was a significant long-period (LP) earthquake and 3 hours later, shallow lower amplitude events started to occur.
At 13:20 local time, another LP earthquake of relatively strong intensity occurred and was followed by a seismic swarm with mostly long period events that continued for 20 minutes.
No surface changes, no glow, and no thermal hot spot on MODIS data accompany this process for the time being, but there is an elevated possibility of new eruptions, expected to be of small phreatic size and similar to the ones in the past months.
Monitoring of the volcano will be increased, Sernageomin announced.
- Reporte Especial Actividad Volcánica (REAV) N° 41 (SERNAGEOMIN special report)
mercredi, janv. 16, 2013
No surface activity and no glow has been observed, but there is elevated seismic activity of low energy with more than 1700 events detected between 15-16 Jan. ... [details]
jeudi, janv. 10, 2013
The volcano produces a dense column of steam and gas rising up to about 1 km. During nighttime there is slight glow visible. More than 1200 earthquakes were recorded during 10 Jan. [details]
mercredi, janv. 09, 2013
SERNAGEOMIN reports a strong increase in seismicity during 8 Dec, when more than 1100 events were recorded with little change in surface activity (so far!). [details]
Copahue volcano (Chile/Argentina border) activity update: seismic swarms, strong degassing, occasional glow from crater
mardi, janv. 08, 2013
SERNAGEOMIN reported 3 seismic swarms and volcanic tremor on 6 Jan, accompanied by increased crater glow and elevated degassing. [details]
dimanche, janv. 06, 2013
Chilean scientist think that new eruptions from the volcano could occur any time. SERNAGEOMIN's latest bulletin informs that the seismicity under Copahue has shown a significant change since 31 December. A number of quakes both related to fracturing of rocks and fluid movements appeared at shallow depths of 4 km and have been becoming shallower. Also, a change in the plume towards becoming denser and grayer, i.e. more ash-rich, has been noted in recent days. For this reason, the alert level was raised back to orange. [details]