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Smithsonian/USGS Weekly Volcanic Activity Report 8-14 June 2011 16 June 2011

Posted by admin in activity reports, Africa, Aso, Batu Tara, Caribbean, Chile, Dieng Volcanic Complex, Eritrea, eruptions, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kizimen, Mayon, Nabro, Pacific, Puyehue, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Tengger Caldera, United States, Vanuatu, Weekly Volcanic Activity Reports, Yasur.
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The Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report, compiled by Sally Kuhn Sennert, has been issued for the week 8-14 June 2011. Another week high in volcanic interest:

  • Kizimen: eruptive episode with ash plumes reaching 4-5 km altitude
  • Nabro: eruption following an earthquake swarm sent ash to 13.7 km altitude
  • Puyehue-Cordón Caulle: eruption continues with continuous ash emission and pyroclastic flows
  • Mayon: slight inflation detected at the summit

SI/USGS Weekly Volcanic Activity Report 8-14 June 2011

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The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 8-14 June 2011 is now available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Aso (Japan), Dieng Volcanic Complex (Indonesia), Kizimen (Russia), Nabro (Eritrea), Puyehue-Cordón Caulle (Chile), Yasur (Vanuatu).

Ongoing activity: Batu Tara (Indonesia), Karymsky (Russia), Kilauea (Hawaii, USA), Mayon (Philippines), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat), Tengger Caldera (Indonesia).

Note: ‘a.s.l.’ = ‘above sea level’.

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The Daily Volcano Quote: tranquil Mayon 20 September 2010

Posted by admin in daily volcano quote, Mayon, Philippines.
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Thirty years had elapsed, since the Volcano of Albay, called by the natives Mayon, had remained in undisturbed silence: so that it was contemplated without those feelings which volcanoes generally raise in the minds of the neighbours. The last eruption took place in the year 1800, when great quantities of sand, stone, and ashes were thrown up, and caused great damage to the neighbouring villages. From that period nothing occurred to mark a volcano; so that the terror which it had occasioned, began by degrees to evaporate. The lofty brow of the mountain was converted into a pleasant and beautiful garden; and was cultivated with hemp, cocoa-nuts, and many kind of fructiferous trees,with a great quantity of roots and leguminous plants, which, at the same time that they afforded a delightful prospect for the eye, gave support to many industrious families.

From The Gentleman’s Magazine, no. 84, part II (1814), p. 641. This tranquil scene was destroyed by the violent eruption of Mayon in February 1814, which devastated the surrounding area and killed more than 1200 people.

The Daily Volcano Quote: from Monday to Friday, a new eruption of volcanic verbiage each day.

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 24 February-2 March 2010 4 March 2010

Posted by admin in activity reports, Caribbean, Costa Rica, Ecuador, eruptions, Fuego, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Mayon, Mexico, Pacaya, Philippines, Poás, Popocatépetl, Russia, Sakura-jima, Santa María, Semeru, Shiveluch, Soufrière Hills, Tungurahua, United States, Weekly Volcanic Activity Reports.
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Some highlights from the last week of volcanic activity reported by the Global Volcanism Program:

  • Poás: grey and sulphur-scented sediment thrown out by a phreatic explosion
  • Santa María: ash plumes from the Santiaguito lava dome complex reached 2.8-3.1 km altitude
  • Tungurahua: ash plumes reached 6.5-8.0 km altitude

SI/USGS Weekly Volcanic Activity Report 24 February-2 March 2010

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The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 24 February-2 March 2010 is now available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Poás (Costa Rica), Semeru (Indonesia), Soufrière Hills (Montserrat).

Ongoing activity: Fuego (Guatemala), Karymsky (Russia), Kilauea (USA), Kliuchevskoi (Russia), Mayon (Philippines), Pacaya (Guatemala), Popocatépetl (Mexico), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia), Tungurahua (Ecuador).

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Mayon alert level lowered to 1 2 March 2010

Posted by admin in activity reports, Mayon, Philippines.
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The Philippine Institute of Volcanology and Seismology (Phivolcs) has lowered the alert level for Mayon from 2 (‘moderate unrest’) to the lowest level of 1 (‘no eruption imminent’). Seismic activity at Mayon is well within normal parameters, there is little or no evidence of magmatic movement within the volcano, deformation measurements indicate deflation, sulphur dioxide emissions and steam emissions are normal, and crater glow indicates no intensification of activity. The Phivolcs Mayon bulletin for 2 March 2010 gives the details, along with a warning that there is a continuing danger from sudden small explosions and rockfalls within the 6-km-radius permanent danger zone around the volcano.

For all our Mayon coverage: Mayon « The Volcanism Blog.

News
Mayon alert level lowered to 1 – Phivolcs – Philippines Daily Inquirer, 2 March 2010

Information
Global Volcanism Program: Mayon – summary information for Mayon (0703-03=)
Philippine Institute of Volcanology and Seismology – website for Phivolcs

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 6-12 January 2010 13 January 2010

Posted by admin in activity reports, Africa, Alaska, Barren Island, Caribbean, Chaitén, Chile, Congo (Dem. Rep.), Costa Rica, Ecuador, eruptions, Fuego, Guatemala, Hawaii, India, Indian Ocean, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Mayon, Mexico, Nyamuragira, Pacaya, Papua New Guinea, Philippines, Piton de la Fournaise, Popocatépetl, Rabaul, Redoubt, Russia, Sakura-jima, Santa María, Shiveluch, Soufrière Hills, Suwanose-jima, Tungurahua, Turrialba, United States, Weekly Volcanic Activity Reports.
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Some of the volcanic activity headlines this week:

  • Mayon: alert level lowered to 2
  • Redoubt: alert level lowered to Normal/Green
  • Tungurahua: gas-and-ash plume rose to 6.5 km altitude
  • Shiveluch: ash plumes reported rising to 4.3-6.4 km altitude
  • Soufrière Hills: extensive pyroclastic flows

SI/USGS Weekly Volcanic Activity Report 6-12 January 2010

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The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 6-12 January 2010 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Mayon (Philippines), Nyamuragira (Democratic Republic of Congo), Piton de la Fournaise (Réunion), Tungurahua (Ecuador), Turrialba (Costa Rica).

Ongoing activity: Barren Island (India), Chaitén (Chile), Fuego (Guatemala), Karymsky (Russia), Kilauea (Hawaii, USA), Kliuchevskoi (Russia), Pacaya (Guatemala), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Redoubt (Alaska, USA), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan).

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Mayon alert level lowered from 3 to 2 13 January 2010

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The Philippine Institute of Volcanology and Seismology (Phivolcs) has lowered the alert level for Mayon from 3 (‘relatively high unrest’) to 2 (‘moderate unrest’). Mayon bulletin no. 31 for 13 January 2010 gives the details:

Seismic activity: ‘The network continues to record a few low frequency-type volcanic earthquakes associated with degassing of residual magma … The lack of remarkable seismic events, such as harmonic tremors, suggests no active transport of magma to shallow levels’.

Ground deformation: ‘Results of precise leveling surveys (05-10 January) at the northwest and southeast slopes of the volcano showed deflationary trend compared to 27 November – 03 December 2009 survey. The electronic tiltmeter installed at the upper northwest slope of the volcano also indicated deflation. These measurements indicate a return of the volcanic edifice to a deflated state, suggesting that no pressure build-up has taken place and reflect a general static condition of residual magma in the volcanic pipe and beneath the crater’.

Gas measurements: ‘Sulfur Dioxide (SO2) emission rate was measured yesterday at an average of 597 tonnes/day (t/d). Measured SO2 levels have decreased considerably from a high of 2,621 t/d to a low of 597 t/d. The decrease in concentration of SO2 gas emission further indicates that no active magma intrusion is occurring beneath the volcanic edifice’.

Visual observation: ‘Steam emission was most of the time weak to moderate and white in color indicating considerable decrease in energy. Crater glow remained visible to the naked eye at night possibly due to the still-hot residual magma beneath the crater’.

For all our Mayon coverage: Mayon « The Volcanism Blog.

News
Phivolcs lowers Mayon alert level to 2 – GMANews.TV, 13 January 2010
Phivolcs lowers Mayon alert levelPhilippine Star, 13 January 2010
Mayon alert level lowered to 2Philippine Daily Inquirer, 13 January 2010

Information
Global Volcanism Program: Mayon – summary information for Mayon (0703-03=)
Philippine Institute of Volcanology and Seismology – website for Phivolcs

The Volcanism Blog

Mayon still quiet: Phivolcs considers lowering alert level to 2 12 January 2010

Posted by admin in activity reports, Mayon, Philippines, volcano tourism.
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Mayon volcano on Luzon remains quiet following its burst of activity last month. The latest Phivolcs bulletin for Mayon, no. 30 of 12 January 2010, reports low seismic activity and ‘weak to moderate emission of white steam’ at the summit crater, with a pale glow visible at the crater overnight. Ground deformation measurements show a deflationary trend compared with early December 2009. Sulphur dioxide emissions have been variable over the past few days: 672 tons/day on 6 January, 1,077 tons/day on 7 January 7, 1,345 tons/day on 8 January, 759 tons/day on 9 January and 820 tons/day on 11 January. The danger of explosions remains, and Phivolcs warns that ‘the 6-km radius Permanent Danger Zone and the 7-km Extended Danger Zone on the southeast flank of the volcano should be free from human activity because of sudden explosions that may generate hazardous volcanic flows’.

The Inquirer reports that Phivolcs ‘could downgrade the alert level of Mayon Volcano from 3 to level 2 within a week’s time should the abnormal condition of the volcano continue to wane’. Meanwhile the United Nations Development Program has praised the response of the Albay Provincial Disaster Co-ordinating Council to the Mayon emergency. ‘I have worked in disaster situations in many countries around the world and, in my own professional opinion, the provincial preparedness and planning is amongst the best that I’ve seen … I believe it could make a good case study for disaster management training’, says the UN’s John English.

The show Mayon has put on over the last month has certainly been good for local tourism, says the Philippine Information Agency. Tourism and hotel occupancy rates surged compared with December 2008 as thousands of people visited Albay province to see the eruption, although that doesn’t mean that the volcanic activity was, overall, a good thing: the ‘benefits of disaster tourism are simply outweighed by the actual destruction on the livelihoods, crops and properties’. Also putting Mayon’s recent restlessness in perspective is Tito Genova Valiente at Vox Bikol, who reflects on perceptions of Mayon from the nineteenth century to the present: ‘Mayon is really part of Nature, invasive and majestic perhaps, but still indicative of the workings of the Earth’.

For all our Mayon coverage: Mayon « The Volcanism Blog.

News
UNDP hails Albay’s Mayon disaster preparedness program – Vox Bikol, 9 January 2010
Re-visiting Mayon – Vox Bikol, 9 January 2010
Mayon still emitting gas – PhivolcsPhilippine Daily Inquirer, 9 January 2010
Mayon eruption brings biggest surge of tourists to Albay – Philippine Information Agency, 11 January 2010
Mayon’s alert level may be lowered to 2Philippine Daily Inquirer, 12 January 2010

Information
Global Volcanism Program: Mayon – summary information for Mayon (0703-03=)
Philippine Institute of Volcanology and Seismology – website for Phivolcs

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report 30 December 2009-5 January 2010 9 January 2010

Posted by admin in activity reports, Africa, Barren Island, Caribbean, Chaitén, Chile, Colombia, Congo (Dem. Rep.), Costa Rica, Ecuador, eruptions, Galeras, Guatemala, Hawaii, India, Indian Ocean, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Mayon, Nevado del Huila, Nyamuragira, Papua New Guinea, Philippines, Piton de la Fournaise, Rabaul, Rinjani, Russia, Sakura-jima, Sangay, Santa María, Shiveluch, Soufrière Hills, Suwanose-jima, Tungurahua, Turrialba, United States, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 30 December 2009 - 5 January 2010

Click on the map for a larger version (1280 x 898 pixels). The map title gives the end of the period covered as 6 January 2010, it should be 5 January 2010. Sorry about that.

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 30 December 2009 – 5 January 2010 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Galeras (Colombia), Mayon (Philippines), Nyamuragira (Democratic Republic of Congo), Piton de la Fournaise (Réunion), Rinjani (Indonesia), Tungurahua (Ecuador), Turrialba (Costa Rica).

Ongoing activity: Barren Island (India), Chaitén (Chile), Karymsky (Russia), Kilauea (Hawaii, USA), Kliuchevskoi (Russia), Nevado del Huila (Colombia), Rabaul (Papua New Guinea), Sakura-jima (Japan), Sangay (Ecuador), Santa María (Guatemala), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan).

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Mayon: slight increase in activity 7 January 2010

Posted by admin in activity reports, Mayon, Philippines.
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The latest Mayon bulletin, no. 25 of 7 January 2010, from the Philippine Institute of Volcanology and Seismology (Phivolcs) records a slight increase in activity compared to the previous day’s bulletin: ’20 volcanic quakes and 20 rockfall events’ compared to the ‘4 volcanic quakes and 21 rockfall events’ reported in bulletin no. 24. Sulphur dioxide emission was lower: 672 tonnes/day compared to 1,914 tonnes/day on 6 January. An overflight revealed ‘remnants of lava pile inside the crater’.

Yesterday the interaction of rain with hot lava deposits caused 50-metre steam plumes that drifted south-west: Phivolcs reassured local residents that there was no cause for alarm. Almost all the 47,000 people evacuated from area around Mayon last month have now returned to their homes; meanwhile, the Philippine Government is considering the permanent removal of residents from the 6-km radius ‘permanent danger zone’ around the volcano, a measure that would affect over 12,000 people according to a report on GMANews.tv.

Phivolcs has warned that ‘small explosions’ are still possible at Mayon. The hazard level for Mayon remains at 3.

For all our Mayon coverage: Mayon « The Volcanism Blog.

News
96% of Mayon evacuees decamped – Albay gov – GMANews.tv, 3 January 2010
Permanent relocation of Mayon’s 6-km zone residents eyed – gov – GMANews.tv, 4 January 2010
Mayon steam no cause for alarmPhilippine Daily Inquirer, 7 January 2010
Small explosions still possible at MayonPhilippine Star, 7 January 2010
Mayon activity up anew; alert level 3 remains – GMANews.tv, 7 January 2010

Information
Global Volcanism Program: Mayon – summary information for Mayon (0703-03=)
Philippine Institute of Volcanology and Seismology – website for Phivolcs

The Volcanism Blog

Alert level lowered at Mayon 2 January 2010

Posted by admin in activity reports, Mayon, Philippines.
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Things are calmer at Mayon: the declining trend in the volcano’s activity since 28 December has convinced Phivolcs to lower the alert level from 4 to 3, indicating ‘relatively high unrest’. Mayon bulletin no. 20, issued by Phivolcs on 2 January 2010, explains as follows:

The latest activity of Mayon still indicates that its overall state of unrest remains relatively high. However, this phase of unrest, characterized by moderate seismicity, high volcanic gas outputs and continuing glow of the summit are processes normally associated with very gradual return to the repose period. The volcanic system is expected to continue producing earthquakes and to vent a large amount of gases because fresh magma still resides along the whole length of the volcanic pipe and near the summit.

From 28 December to present, a declining trend in Mayon volcano’s activity was noted as reflected by the following observations:

1. No ash ejections were observed since 29 December. Steam emission was most of the time weak and white in color indicating considerable decrease in energy and absence of ash.

2. Majority of the type of earthquakes that were recorded during the past days were associated with rockfalls and rolling down of fragments from the lava deposits along Bonga gully and the advancing lava front.

3. Measured SO2 levels have also showed a decreasing trend from a maximum of 8,993 tons per day to 2,621 tons per day. The still high concentration of SO2 gas emission suggests that there is residual magma degassing at shallow depth.

In view of the above observations, PHIVOLCS-DOST is lowering the alert status of Mayon from Alert Level 4 to Alert Level 3 to reflect the overall gradual decrease of activity. Alert Level 3 means that there is less probability of a hazardous explosive eruption. However, the lowering of the alert level from 4 to 3 should not be interpreted that the unrest of the volcano has ceased. If there is resurgence in the volcano’s activity and the potential for explosive eruptions is perceived to be forthcoming, the alert level may be raised back to 4 but if there is noticeable downward trend in the monitored parameters, then the alert will be further lowered to Alert Level 2.

Even before the decision to lower the alert level was taken, Albay Governor Salceda was welcoming the decline in Mayon’s activity with characteristic enthusiasm: ‘It really looks like Mayon drops dead. This is the first time in its recorded history. It seems that God answered our prayers and saw the collective preparations of a united people’. However, this may be a little optimistic. Extended periods of variable activity – declines followed by upswings – are characteristic of Mayon’s eruptive history: the first half of 2001 was marked by episodes of decline and resurgence, accompanied by changes in alert level, leading to significant eruptions in June and July of that year. There may very well be more to come from Mayon.

Local farmer Pedro Balast, at 77 a veteran of 11 evacuations and several eruptions, has this to say: ‘I won’t go home yet, I will stay here for a while. Mayon should not be trusted especially that it suddenly dies down … eruption will come if there is a sudden lull’. Nevertheless, evacuees are heading home, although a 4-kilometre exclusion zone remains in place around the volcano.

For all our Mayon coverage: Mayon « The Volcanism Blog.

News
Mayon quieting downPhilippines Daily Inquirer, 1 January 2010
Farmer still wary of calm before the stormManila Bulletin, 2 January 2010
Mayon evacuees head home as eruption less imminent – GMANews.TV, 2 January 2010

Information
Global Volcanism Program: Mayon – summary information for Mayon (0703-03=)
Philippine Institute of Volcanology and Seismology – website for Phivolcs

The Volcanism Blog