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Archived Volcano News - John Seach
June 2011
Wednesday 29th June 2011
Puyehue Volcano, Chile
Ash from Puyehue volcano in Chile extended 1500 km east and northeast of the volcano on 28th June. Continued seismic activity at the volcano was related to an open conduit and the release of magmatic gas. There has been no harmonic tremor recorded at the volcano which indicates that lava emission has decreased. Explosive eruptions generating pyroclastic flows are possible, and highlight the dangers in the upper river valleys. Heavy ashfall in the valleys have created a lahar hazard. The alert level reamins at RED.
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Monday 27th June 2011
Puyehue Volcano, Chile
Ash from Puyehue volcano in Chile disrupted air traffic over Australia and New Zealand from 13-27 June. During the week beginning 13th June more than 700 flights were affected and disrupted travel for over 100,000 passengers. On 27th June flights between Australia and New Zealand resumed, however flight in Chile and Argentina continue to be affected.
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Monday 27th June 2011
Nabro Volcano, Eritrea
An eruption began at Nabro volcano on 12th June 2011. This was the first historical eruption at the volcano. The eruption was accompanied by an earthquake swarm beginning with a magnitude 5.1. The largest earthquakes had a magnitude 5.7 on 12th and 13th June 2011. The eruption produced a 45,000 ft high eruption plume, and disrupted air traffic in the horn of Africa. Satellite images showed the plume drifting more than 1,000 km NW, over parts of Sudan. A 15 km long lava flow was identified on satellite hotspot images.
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Thursday 9th June 2011
Puyehue Volcano, Chile
Seismic activity continues to decline at Puyehue volcano in Chile. On the 7th June there were 5 earthquakes measured per hour, with a maximum magnitude of 2.6. The earthquakes were caused by explosions at the volcano. Continuous tremor is also being recorded and is related to degassing. At 4:45 am local time on 7th June an ash plume extended 1200 km from the volcano. The first 600 km of the plume drifted northeast and then changed southeast across Argentina and the Atlantic Ocean. Several waves of pyroclastic flows travelled down the Nilahue river, whose waters reached temperatures of 45 º C. Material up to 30 cm diameter is flowing down the river and highlights the dangers of the proximity of the upper parts of the river valley and its tributaries. A significant amount of ash has been deposited in the upper reaches of the watershed that drains into Lake Maihue. Lahars could affect communities living in these valleys.
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Wednesday 8th June 2011
Puyehue Volcano, Chile
There has been a progressive decline in seismic activity at Puyehue volcano in Chile. On Sunday 10 earthquakes were registered per hour with the maximum magnitude 3.2. The earthquake focus was at a depth of 2-5 km on the SE side of the volcano. Continuous tremor is at the volcano is related to degassing events. The GOES satellite measured the eruption plume reaching an altitude of 10 km and drifting 3300 km from the volcano. The plume extended 300 km NE then changed to a SE direction. Five pyroclastic flows were generated by partial column collapse, and may have extended for a distance of 10 km. A high concentration of ash at the headwaters of rivers means that secondary lahars remain a hazard. On Monday seismic activity declined further to 7 events per hour, with a maximum magnitude of 2.8. At 9:30 am visual estimates recorded the ash column at a height of 7.5 km which was consistent to that recorded from GOES satellite. Samples from Rio Nilahue showed brownish gray waters with abundant suspended fine ash and pumice floating in size which was predominantly lapilli between 1 to 3 cm diameter. Small bombs were also collected with a diameter up to 7 cm. The bombs were reddish brown, due to greater heat and oxidation with water vapor. Water temperature: 9.25 ° C, pH: 4.5. The recorded ambient temperature was 7 º C. The main rivers which may be affected by lahars are in the northeast río Riñinahue, río Los Venados, río Contrafuerte y río Nilahue; and in the southwest: río Chirre, and río Licán.
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Monday 6th June 2011
Puyehue Volcano, Chile
Puyehue volcano in Chile erupted on Saturday 4th June 2011 after 51 years of inactivity. On the 3th June a seismic swarm occurred with 1450 earthquakes registered at the volcano, associated with magma movement under the volcano. The earthquakes has a focus of 2-5 km depth on the southeast flank of the volcano. More than 130 earthquakes were greater than magnitude 2. On Saturday 4th of June the volcano alert was raised to level RED after a marked increase in seismic activity. Over a period of six hours there more than 230 earthquakes per hour with a focus of 1-4 km depth. Twelve of the earthquake were greater than magnitude 4.0, 50 greater than magnitude 3.0. More than half the earthquakes were over magnitude 2.0. The largest earthquake occurred at 8:36 am local time on 4th June with a magnitude 4.4. Residents reported felt earthquakes on Friday evening and Saturday morning. The explosive eruption began on Saturday 4th June producing a 10 km high ash column. More than 600 people were evacuated from the area. Volcanic ash fell in the city of Bariloche in Argentina, and the airport was closed. Residents of Bariloche said that ash fell like a snowstorm. The Argentine government has sent military troops to help residents affected by the ashfall. A border crossing between Chile and Argentina at Cardenal Samore was closed due to the eruption creating poor visibility on the mountain pass. The last eruption of Puyehue volcano was in 1960 following a 9.5 earthquake.
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Thursday 2nd June 2011
Dieng Volcano, Indonesia
Gas emissions from Dieng volcano in central Java has forced the evacuation of 1200 residents. On 28th May there was a sudden increase in carbon dioxide emissions at Timbang. On the 29th May there was a felt earthquake at the volcano followed by shallow seismic activity. This corresponded to a phreatic eruption at Timbang crater. Dead birds were found near the crater. People are advised to remain at least 1 km from Timbang crater. The alert status hat the volcano has been raised to level 3 (Siaga) out of a maximum 4.
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