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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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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Wednesday, January 05, 2011

Merapi Volcano, Indonesia - John Seach

Lahars from Merapi volcano have destroyed several bridges including Gempol bridge on the Putih River. A lahar overflowed from the Putih River in Jumaya village, Salam subdistrict, on Monday night, cutting off the Magelang-Yogyakarta highway at Kilometer 23 for almost 18 hours until about 1 p.m. on Tuesday. More than 500 meters of the highway were submerged under meter-deep lahar. This was the most damage cause by merapi volcano since the alert level was downgraded at end of December 2010.
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Volcanoes of Colombia - John Seach

Four volcanoes in Colombia have been placed on raised yellow alert. The volcanoes are Machin, Galeras, Huila, andl Ruiz. Earthquakes increased at Machin volcano on 31st December 2010. Over 4 days 367 volcano-tectonic earthquakes were detected south and southwest of the main dome. The largest event occurred at 5:22 pm on 1st January 2011, with a magnitude 2.3 and a depth of 3.3 km. The earthquake was felt by residents in vicinity of the volcano and in the municipality of Cajamarca (Tolima). In the week from 22 to 28 December 2010, 363 seismic events occurred at Nevado del Huila volcano, of which 72 were related to fracturing of rock and 291 caused by fluid dynamics in volcanic conduits. Nevado del Ruiz and Galeras have showed elevated but stable activity.
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