News & activity updates:
Hudson volcano (Southern Chile and Argentina, South America) activity update: increased seismic activity
Monday Dec 05, 2016 16:03 PM | BY: T
Seismic activity under the volcano has recently shown a mild increase, triggering Chile's SERNAGEOMIN to raise the volcanic alert level to "yellow".
The frequency of volcanic quakes increased from less than 10 during each of August and September to 26 in October and 70 in November. In the latter month, phases of tremor and so-called hybrid earthquakes - both thought to represent magma movements at depth - also occurred.
The source of the quakes seems to be the same or similar to the 2011 eruption. No other significant signs of volcanic unrest (such as increased degassing, surface temperature etc) have been detected suggesting that an eruption (if at all) is not likely to come very soon.
ONEMI (Chilean Civil Protection) also issued a warning for 3 municipalities (Aysén, as well as Río Ibáñez and Chile Chico to the east and SE) which are potentially at risk in case of new eruptive activity. The principal hazards are ash falls and mud flows (lahars), the latter are however only likely in case of a major eruption (such as the one in 1991) that could generate a glacial flood into rivers draining the summit caldera.
This institutional warning allows the agency to implement a number of measures, such as distributing related information to the population and developing emergency plans.
The last eruption of Cerro Hudson was in Oct 2011 when a small explosive fissure eruption (VEI 2) took place inside the volcano's glaciated caldera.
Friday, Oct 28, 2011
An eruption has started at Cerro Hudson volcano in Chile. The activity comes from a new eruptive fissure located south of the summit with 3 vents that emit clouds of steam and some ash, rising to 5.5 km elevation. ... [more]
Thursday, Oct 27, 2011
Another volcano in Southern Chile, Mt Hudson in the Aysén region, could be close to a new eruption. Starting on Tuesday, over 100 earthquakes have been detected under the volcano by the National Institute of Geology (SERNAGEOMIN), who raised the alert level to Red ("eruption could be imminent"). ... [more]