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Archived Volcano News - John Seach
October 2011
Saturday 29th October 2011
Hudson Volcano, Chile
A large exclusion zone of 45 km is in place around Hudson volcano in southern Chile. The volcano remains on the highest level 5 alert due to high seismic activity. Steam and minor ash emissions reached height of 5.5 km on Thursday 27th October. A minor eruption was confirmed on Wednesday 26th October. The eruption of Hudson volcano in 1991 was one of the largest in the world in the 20th century.
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Thursday 27th October 2011
Hudson Volcano, Chile
Hudson volcano in southern Chile has been placed on the highest level 5 alert, with an eruption possible within hours or days. An earthquake swarm occurred at the volcano on 26th October 2011. Population centres are located downwind of the volcano and ashfall would be expected after an eruption. The summit contains ice therefore an eruption would likely generate lahars. There is a possibility of secondary lahars after rainfall mobilises ash deposits. Visual observations of the volcano on 26th October showed a white column, with little ash, rising to a height of 1.5 km above the volcano. The last eruption of Hudson volcano in 1991 was very large and sent ash across Patagonia, Falkland Islands, and Australia.
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Thursday 20th October 2011
Mauna Kea Volcano, Hawaii
An earthquake swarm occurred under Mauna Kea volcano in Hawaii on 19th October 2011. The largest earthquake was magnitude 4.5 and had a focus at a depth of 18 km at a location 9 km NE of the summit.
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Tuesday 11th October 2011
Hierro Volcano, Canary Islands
An undersea eruption began off the coast of El Hierro Island, Canary Islands on 10th October 2011. Initial reports have placed the eruption site a few kilometres off the south coast of the island at a depth of about 450 m. The eruption has only been confirmed from seismic activity.
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Wednesday 5th October 2011
Katla Volcano, Iceland
An earthquake swarm has begun under the Mýrdalsjökull glacier in Iceland near Katla volcano. The swarm began around 3 am on 5th October 2011. The first earthquake in the swarm measured magnitude 3. Residents of Vík in on the coast near the glacier have been alerted to a possible glacial outburst from Mýrdalsjökull.
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Tuesday 4th October 2011
Krakatau Volcano, Indonesia
Krakatau volcano in Indonesia was raised to level 3 alert (out of maximum 4) on 30th September 2011. Between 18-30 September volcanic earthquakes and tremor were recorded at the volcano. Explosive eruptions have occurred intermittently at the volcano between 2007 and 2011. During this time Strombolian eruptions sent ash and lapilli to a radius of 1.5 km from the crater. Volcanic bombs may fall over the whole island at any time. Explosive eruptions in July 2011 destroyed the seismic monitoring equipment, which resumed operation on 18th September. A 2km exclusion zone has been placed around the volcano.
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