Mt Etna's second eruption of the year occurred at SE crater on 18th February, 36 days after the previous eruption. The eruption lasted 11 hours and produced strombolian activity, fountains, and a lava flow. The active vent was located on the lower eastern flank of SE crater. The eruption was preceded by an explosive event probably at NE Crater, late on 16th February. A lava flow from SE crater descended eastward, following the same path as that of the 12-13 January, in the direction of the Valle del Bove. Light ashfall was reported on the flanks of the volcano.
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Saturday, February 19, 2011
Thursday, February 17, 2011
Mt St Helens Volcano, USA - John Seach
A swarm of earthquakes hit Mt St Helens volcano on 14th February 2011. The earthquakes were centered in an area near the Johnston Ridge Observatory, about 7 km north of the crater. The earthquakes had a focus at a depth of about 2-4 km. At least 12 small earthquakes were measured in the area since Monday. The initial earthquake was the largest with a magnitude of 4.3 and hit around 10:35 a.m. local time. The earthquakes are possibly caused by fault movement under the volcano as a result of magma removal during the 1980 eruption. Earthquake swarms occurred in the same area in January 2011 and August 1980. The USGS stated "at present there appears to be no signs of unrest in the volcanic system". The current volcano alert level for Mount St. Helen's remains at normal.
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Saturday, February 05, 2011
Kirishima Volcano, Japan - John Seach
Eruptions continue at Kirishima volcano, Japan. Since the eruption began in January, an estimated 80 million tons of ash have fallen over a wide area. There have been nine large explosions at Shinmoedake. A lava dome has formed in the crater and poses a risk of pyroclastic flows. The lava dome is 600 meters in diameter and 110 meters high. The eruptions are the largest in Japan since 2004 when December 2004, when Miyakejima volcano erupted south of Tokyo.
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Saturday, January 15, 2011
Mt Etna Volcano, Italy - John Seach
Lava fountains occurred at SE crater, Mt Etna on the night of 12-13 January 2011. The eruption consisted of a sustained lava fountain, lava flow, and an ash column reaching several kilometres high. The lava fountain lasted 42 minutes from 22:48-23:30 hr on 12th January and reached a height of 300-500 m. The lava fountain became pulsating after this time and reached a height of 100-200 m until 0:55 hr on the morning of 13th January. Ashfall was reported on the south flank of Mt Etna. The eruption was preceded by smaller episodes of Strombolian activity from SE crater on 23rd December 2010, and the evening of 2-3 January 2011. A lava flow descended the western slope of the Valle del Bove in three branches and reached the base after midnight. The longest flow surrounded the northern side of Monte Centenari, 4.2 km from the vent. On the 13th January ash emissions were caused by a partial collapse within the cone and eruptive activity.
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More on Mt Etna volcano...
Friday, January 14, 2011
Mt Etna Volcano, Italy - John Seach
Eruptions have occurred at Mt Etna volcano, Italy. On the evening of 11th January 2011 an increase in volcanic tremor was recorded at the volcano. Seismic activity reached a peak at 07:00 hr on 12th January when the source moved from north of NE crater to the SE crater. This corresponded to weak eruptive activity at SE crater on 11th January. On 12th January eruptions increased with strombolian activity recorded at SE crater. About 21:00 hr, lava overflowed the eastern rim of SE crater, and fed a flow that moved toward the western wall of the Valle del Bove.
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Wednesday, January 12, 2011
Krakatau Volcano, Indonesia - John Seach
Eruptions from Krakatau volcano, Indonesia have forced the evacuation of tens of thousands residents. Seven districts affected are Kalianda, Rajabasa, Katibung, Sidomulyo, Ketapang, Sragi and Palas. On Monday ash from Anak Krakatau continued to cover residential areas in parts of Banten province and South Lampung. Visual observations showed ash emissions reaching a height of 600 m and drifting east. Ashfall has affected the operation of seismometers on the volcano. Fisherman and tourists are advised to stay at least 2 km from the volcano.
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Saturday, January 08, 2011
Kizimen Volcano, Kamchatka - John Seach
Eruptions continue at Kizimen volcano, Kamchatka with explosions and pyroclastic flows. Seismic activity is high, with volcanic tremor recorded. A hotspot was present over the volcano during the past week, which indicates a probable lava flow. On 1st January an ash plume extended 500 km SSW of the volcano and ashfall was recorded at Petropavlovsk-Kamchatsky, Yelizovo, Paratunka, Nalychevo and all Southern Kamchatka. On 5th January ash emissions extended over 500 km ENE of the volcano and ashfall was recorded in the Komandorsky Islands. On 5th December 2010 ash emissions reached a distance of 838 km NE of the volcano.
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More on Kizimen volcano...
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