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Smithsonian/USGS Weekly Volcanic Activity Report 7-13 March 2012 15 March 2012

Posted by admin in activity reports, Alaska, Bezymianny, Chile, Cleveland, Colombia, eruptions, Hawaii, Ijen, Iliamna, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kizimen, Lamongan, Marapi, Nevado del Ruiz, Puyehue, Russia, Sakura-jima, Santa María, Shiveluch, Tungurahua, United States, Villarrica, Weekly Volcanic Activity Reports.
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The latest Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been published by the Global Volcanism Program, covering the week 7-13 March 2012. The report is compiled by Sally Kuhn Sennert. Some of the news from a week that has seen quite a lot of new activity:

  • An explosive eruption at Bezymianny sent ash up to 8 km altitude
  • Activity at Nevado del Ruiz marked by explosions, ash emissions and increased seismicity
  • Cleveland stirs with small explosive eruptions
  • Explosions at Santa María produce localized ashfall

SI/USGS Weekly Volcanic Activity Report 7-13 March 2012

Click on the map for a larger version (1211 x 784 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 7-13 March 2012 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: Bezymianny (Russia), Cleveland (Alaska, USA), Ijen (Indonesia), Iliamna (Alaska, USA), Lamongan (Indonesia), Marapi (Indonesia), Nevado del Ruiz (Colombia), Tungurahua (Ecuador).

Ongoing activity: Karymsky (Russia), Kilauea (Hawaii, USA), Kizimen (Russia), Puyehue-Cordón Caulle (Chile), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia), Villarrica (Chile).

Note: ‘a.s.l.’ = ‘above sea level’.

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Cleveland, Alaska: another small explosion 15 March 2012

Posted by admin in activity reports, Alaska, Cleveland, eruptions, Iliamna, United States.
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Cleveland volcano in the Aleutians had another small eruption on the afternoon of 13 March, reports the Alaska Volcano Observatory, the third such event in a week (the previous eruptions were on 7 March and 10 March). The AVO status report, issued on 14 March at 1134 local time (1934Z) describes what happened:

Yesterday afternoon at approximately 2:55 pm AKDT (22:55 UTC), AVO infrasound and seismic networks detected a small explosion at Cleveland. Clouds prevented a clear view of the volcano at the time of the explosion, however, ash was not observed rising through the cloud deck suggesting relatively minor ash emission.

The Volcano Alert Level for Cleveland remains at Watch, the Aviation Colour Code at Orange. The same report notes that seismicity remains elevated at Iliamna volcano (which remains at Yellow/Advisory).

News
Cleveland volcano explodes for the third time – alaskapublic.org, 14 March 2012

Information
Global Volcanism Program: Cleveland – summary information for Cleveland (1101-24-)
Global Volcanism Program: Iliamna – summary information for Iliamna (1103-02-)
AVO Cleveland Activity Page – information on current activity at Cleveland
AVO Iliamna Activity Page – information on current activity at Iliamna
Alaska Volcano Observatory – AVO main page

The Volcanism Blog

Sakura-jima: eruptive activity increases 13 March 2012

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Situated in the south of Kyushu, the southernmost of the four main islands making up the Japanese archipelago, Sakura-jima is one of the world’s most active volcanoes. The Global Volcanism Program records Sakura-jima’s current eruption as having begun in October 1955, so it has now been on the go continuously for more than half a century.

Over the past couple of weeks Sakura-jima has shown an increase in the level of its activity, with ash explosions increasing in size and frequency. Yesterday there was a sizeable explosion which the Japan Meteorological Agency classed as the most powerful since 2009 (‘Foot-wide rocks were expulsed over a mile away’ reports the Daily Telegraph, incoherent with excitement), and today the activity has continued with violent explosions, lava fountaining, and pyroclastic material being ‘expulsed’ up to 2 km altitude.

News
Volcano erupts violently in JapanDaily Telegraph, 13 March 2012 (video)
Moment volcano erupted in Japan – BBC News, 13 March 2012 (video)

Information
Global Volcanism Program: Sakura-jima – summary information for Sakura-jima (0802-08=)

The Volcanism Blog

Alaska: another small explosion at Cleveland 11 March 2012

Posted by admin in activity reports, Alaska, Cleveland, eruptions, Iliamna, United States.
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The Alaska Volcano Observatory reports another small explosive event at Cleveland volcano, following the small explosion detected on 7 March. This one happened in the afternoon (local time) of 9 March, as the AVO Volcanic Activity Notification reports:

Another small, short duration explosion from Cleveland Volcano was detected on distant seismic stations and infrasound arrays on about 1:55 March 10, UTC (4:05 PM March 9, AKST.) No ash cloud from this event was detected in satellite imagery probably due to cloudy weather conditions. This explosion was similar to recent small events that occurred on March 7 and in December 2011. These events produced small ash clouds that dissipated quickly and did not affect air traffic.

The Volcano Alert Level for Cleveland remains at Watch, the Aviation Colour Code at Orange. The same report gives an update on Iliamna, where seismic activity remains above background. Iliamna’s alert status is currently one notch below Cleveland’s, at Volcano Alert Level Advisory, Aviation Colour Code Yellow.

News
Cleveland volcano rocked by explosionAnchorage Daily News, 10 March 2012.

Information
Global Volcanism Program: Cleveland – summary information for Cleveland (1101-24-)
Global Volcanism Program: Iliamna – summary information for Iliamna (1103-02-)
AVO Cleveland Activity Page – information on current activity at Cleveland
AVO Iliamna Activity Page – information on current activity at Iliamna
Alaska Volcano Observatory – AVO main page

The Volcanism Blog

Alaskan activity update: Cleveland and Iliamna (updated) 9 March 2012

Posted by admin in activity reports, Alaska, Cleveland, eruptions, Iliamna, United States.
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Beautiful, symmetrical Cleveland volcano in the Aleutians, which has been rumbling on and off over the last few months as its lava dome has grown, produced a small eruption last night, reports the Alaska Volcano Observatory:

A small, short duration explosion was detected from Cleveland Volcano on distant seismic stations and infrasound arrays. The time of the explosion was approximately 4:05 UTC March 8 (7:05 PM March 7, AKST.) Weather cloud conditions prevented the detection of an eruption cloud in satellite images or visual observation of the summit. This explosion was similar to recent small events that occurred in December 2011 and produced small ash clouds that dissipated quickly and did not affect air traffic. At this time, no further activity has been detected.

Alaska Public Radio gets a bit over-excited, reporting that ‘Cleveland Volcano has blown its top again’. Talking of Cleveland blowing its top is putting it a little strongly. This latest eruption, as AVO says, was a small event. There may well be more of this kind of small-scale explosion, often caused by localized rock fracturing and movement, as the lava dome continues to grow. Cleveland does not have a real-time seismic monitoring network, but AVO will continue to monitor Cleveland closely. Cleveland is currently at Orange/Watch.

UPDATE. An article in the Anchorage Daily News quotes Steve McNutt of the Alaska Volcano Observatory airing the possibility that the explosion last night may have ‘blasted away a lava dome building inside the volcano’s summit crater’. AVO volcanologists are hoping that satellite images will shortly show what exactly happened during this eruption. It will be interesting to see if all or part of the lava dome has indeed gone missing.

Another Alaskan volcano, Iliamna, which does have real-time seismic monitoring, has been experiencing episodes of increased earthquake activity and is being carefully watched by AVO. So far the alert status for Iliamna has not been raised and remains at Green/Normal.

News
4.1 earthquake comes as scientists watch Alaska’s Iliamna volcanoAlaska Dispatch, 8 March 2012
Explosion detected at Alaska’s Cleveland volcanoAlaska Dispatch, 8 March 2012
Two Alaska volcanoes show signs of activityChicago Tribune, 8 March 2012
Seismic stations pick up Cleveland blast – alaskapublic.org, 8 March 2012
Blast shakes restless volcano in remote Aleutian IslandsAnchorage Daily News, 8 March 2012

Information
Global Volcanism Program: Cleveland – summary information for Cleveland (1101-24-)
Global Volcanism Program: Iliamna – summary information for Iliamna (1103-02-)
AVO Cleveland Eruption Page – information on current activity at Cleveland
Alaska Volcano Observatory – AVO main page

The Volcanism Blog

Eruption at Bezymianny: ash reaches over 8 km a.s.l. 9 March 2012

Posted by admin in activity reports, Bezymianny, eruptions, Kamchatka, Russia.
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As the scientists at the Kamchatka Volcano Emergency Response Team (KVERT) anticipated, Bezymianny has erupted. KVERT reported at 2226Z last night:

Strong explosive eruption began about 21:27 UTC on March 08 – according to seismic data. Explosive eruption will continue and strong ash explosions up to 43,000 ft (13 km) a.s.l. possible at any time. Ongoing activity could affect international and low-flying aircraft.

The same bulletin reports plumes then reaching 5 km a.s.l. A later bulletin, issued at 2313Z, described the eruption by this time as ‘moderate’ and reported ‘Culmination phase of the explosive eruption occurred at 21:40 UTC on March 08, when ash plumes from pyroclastic deposits rose up to 26,200 ft (8 km) a.s.l.’ The latest bulletin, released at 0700Z today, summarizes the activity as follows:

Activity of the volcano after strong explosive phase of eruption is gradually decreasing but continues. Ongoing activity could affect low-flying aircraft. Strong explosive eruption began at 21:27 UTC on March 08. According to seismic data, the culmination phase of the eruption occurred from 21:27 till 22:10 UTC on March 08, a magnitude of volcanic tremor was 7.52 µm/s at that time. From 23:00 UTC on March 08, volcanic tremor was not registering. Ash plumes from pyroclastic deposits rose up to 26,200 ft (8 km) a.s.l. and extended to the northeast of the volcano on the height about 19,700 ft (6 km) a.s.l. At about 00:15 UTC on March 09, probably a new portion of ash began to extending a little to northern to northeast of the volcano. According to satellite data, a length of ash plume was about 434 mi (700 km) at 04:32 UTC on March 09. At present, the moderate eruption is continuing. According to video data, gas-steam plumes containing ash are raising up to 11,500-13,100 ft (3.5-4.0 km) a.s.l. and extending to the north-east of the volcano.

Tokyo VAAC issued its latest advisory for Bezymianny at 0559 today, describing ‘emissions continuing’ and ash moving NE of the volcano and reaching airspace at FL270 (27,000 feet or 8.2 km a.s.l.). Things currently look reasonably quiet (and, of course, dark) at the Bezymianny webcam. KVERT has uploaded some pictures of the March 8-9 activity to its Bezymianny activity page; latest images at the top.

News
Bezymianny volcano (Kamchatka): new explosive eruption sends ash to 27,000 ft altitude – VolcanoDiscovery, 9 March 2012
Bezymianny volcano erupts again – Voice of Russia, 9 March 2012

Information
Global Volcanism Program: Bezymianny – summary information for Bezymianny (1000-25=)
KVERT: information releases – current activity summary for Kamchatka volcanoes
Alaska Volcano Observatory – Activity – includes AVO reports on Kamchatka volcanoes
Kamchatkan Volcanic Eruption Response Team – KVERT information page from the AVO

The Volcanism Blog

Smithsonian/USGS Weekly Volcanic Activity Report 29 February – 6 March 2012 8 March 2012

Posted by admin in activity reports, Alaska, Bagana, Bezymianny, Canary Islands, Chile, Cleveland, Ecuador, eruptions, Etna, Fuego, Guatemala, Hawaii, Hierro, Italy, Japan, Kamchatka, Kanaga, Karymsky, Kilauea, Kizimen, Mexico, Papua New Guinea, Popocatépetl, Puyehue, Russia, Sakura-jima, Santa María, Shiveluch, Spain, Suwanose-jima, Tungurahua, United States, Weekly Volcanic Activity Reports.
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The latest Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been published by the Global Volcanism Program, covering the week 29 February to 6 March 2012. The report is compiled by Sally Kuhn Sennert. Some of the highlights of the volcanic week:

  • Continuing activity at Etna including strombolian eruptions, lava fountaining and lava flows
  • Explosions at Fuego produced plumes that reached 0.6 km above the crater
  • Plumes rose to 1 km above Puyehue-Cordón Caulle as low-level eruptive activity continues

SI/USGS Weekly Volcanic Activity Report 29 February - 6 March 2012

Click on the map for a larger version (1211 x 784 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 29 February – 6 March 2012 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: Bezymianny (Russia), Cleveland (Alaska, USA), Etna (Italy), Kanaga (Alaska, USA), Tungurahua (Ecuador).

Ongoing activity: Bagana (Papua New Guinea), Fuego (Guatemala), Hierro (Canary Islands), Karymsky (Russia), Kilauea (Hawaii, USA), Kizimen (Russia), Popocatépetl (Mexico), Puyehue-Cordón Caulle (Chile), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia), Suwanose-jima (Japan).

Note: ‘a.s.l.’ = ‘above sea level’.

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Smithsonian/USGS Weekly Volcanic Activity Report 22-28 February 2012 1 March 2012

Posted by admin in activity reports, Alaska, Bezymianny, Canary Islands, Chile, Cleveland, Costa Rica, Ecuador, eruptions, Guatemala, Hawaii, Hierro, Japan, Kamchatka, Kanaga, Karymsky, Kilauea, Kizimen, Mexico, Popocatépetl, Puyehue, Russia, Sakura-jima, Santa María, Shiveluch, Spain, Tungurahua, United States, Weekly Volcanic Activity Reports.
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The latest Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been published by the Global Volcanism Program, covering the week 22 February to 28 February 2012. The report is compiled by Sally Kuhn Sennert. Some of the highlights:

  • Rincón de la Vieja: two eruptions from Rincón de la Vieja’s active crater
  • Tungurahua: moderate activity continues, with ashfall, incandescence, steam-and-ash plume
  • Puyehue-Cordón Caulle: low-level eruptive activity continues, with lava flows and ash plumes
  • Santa María: explosions produced 0.6-1.3 km plumes and ashfall, pyroclastic flows reported

SI/USGS Weekly Volcanic Activity Report 22-28 February 2012

Click on the map for a larger version (1211 x 784 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 22-28 February 2012 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: Cleveland (Alaska, USA), Kanaga (Alaska, USA), Rincón de la Vieja (Costa Rica), Tungurahua (Ecuador).

Ongoing activity: Bezymianny (Russia), Hierro (Canary Islands), Karymsky (Russia), Kilauea (Hawaii, USA), Kizimen (Russia), Popocatépetl (Mexico), Puyehue-Cordón Caulle (Chile), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia).

Note: ‘a.s.l.’ = ‘above sea level’.

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Another large eruption at Lokon (updated) 17 July 2011

Posted by admin in activity reports, eruptions, Indonesia, Lokon-Empung.
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Another large eruption of Mount Lokon in Sulawesi this morning (Sunday 17 July), according to news reports: a 3.5 km altitude ash plume, and the first confirmed fatality of the current eruptive episode, a woman suffering a heart attack as she fled the eruption [CORRECTION: apparently this unfortunate event occurred during last week's eruptions]. Indonesian volcanologist Surono describes today’s eruption as the largest yet. As the eruption started, local residents who had been returning to their homes and crops following earlier evacuations cleared out in a hurry once again.

Darwin VAAC issued a volcanic ash advisory at 07:37 GMT reporting no volcanic ash emissions visible on satellite imagery, but noting media reports of ash between 3 km and 5 km altitude, moving north, and confirming that ‘situation will be closely monitored’. According to the New Zealand Herald flights from Manado airport have not yet been affected by the eruption, but the airport has been warned to be on alert for possible ash at altitude. The Jakarta Post reported earlier today that ‘at least 4,889 people’ had been evacuated following the latest eruption. The local paper Tribun Manado reports that civil protection authorities have been touring villages in the area and warning their residents to evacuate, and that the security of the exclusion zone around the volcano has been tightened following today’s eruption, with even local residents being denied access. Tribun Manado also has extensive photo galleries of the eruption: gallery 1- gallery 2gallery 3gallery 4gallery 5 (links from Earthquake-Report.com).

Some distinctly oddball stories on the eruption have also been appearing in Tribun Manado: one on traditional beliefs that certain areas will be protected by supernatural agencies from the volcano’s activity, and another on an alleged appearance of Jesus’s face in the volcano’s ash cloud.

Regularly updated coverage of the Lokon eruption can be found at Earthquake-Report.com. Thanks to Raj in Manado for reports and translations, and thanks also to reader Raving who has posted a video of the eruption in the comments below.

News
Indonesia volcano spews ash in biggest eruption – Associated Press, 17 July 2011
Indonesians flee new volcano eruption on Sulawesi – BBC News, 17 July 2011
4,889 evacuated after Mt. Lokon eruptionsJakarta Post, 17 July 2011
Indonesia’s Mount Lokon volcano eruptsDaily Telegraph, 17 July 2011
Sketsa mirip wajah Yesus muncul saat letusan lokonTribun Manado, 17 July 2011
‘Katanya Desa Warembungan dilindungi Tatawiran dan opo Lokon’Tribun Manado, 17 July 2011
SAR imbau warga Desa Tinoor 1 untuk berhati-hatiTribun Manado, 17 July 2011
Kapolres perintahkan tutup akses ke pos pemantauan LokonTribun Manado, 18 July 2011
Flight alert after new Lokon eruptionNew Zealand Herald, 18 July 2011

Information
Global Volcanism Program: Lokon-Empung – summary information for Lokon-Empung (0606-10=)
Volcanological Survey of Indonesia – information and status reports in Indonesian

The Volcanism Blog

Mount Lokon eruption continues 15 July 2011

Posted by admin in activity reports, eruptions, Indonesia, Lokon-Empung.
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Mount Lokon erupting 14 July 2011 (image courtesy Tribun Manado)
Mount Lokon volcano, North Sulawesi, erupting on 14 July 2011 (image courtesy Tribun Manado, via Earthquake-Report.com).

The eruption of Sulawesi’s Mount Lokon that began yesterday (after days of lower-level eruptive activity) continues, with spectacular explosive activity and the eruption of ash and lava. Ash has darkened the sky over the city of Manado. Darwin VAAC has issued a Volcanic Ash Advisory for the eruption which notes that no ash cloud is yet detectable on satellite imagery, but that volcanic ash from the eruption has reached 1,500 metres above the crater. The Indonesian aviation authorities are warning flights in the area of the presence of volcanic ash at low altitudes, but Manado airport is operating normally and no diversions or cancellations have yet been ordered. No casualties have been reported from this eruption, and evacuations had already taken place around the volcano earlier this week; the evacuations have now been expanded to encompass over 4,000 people.

Mount Lokon is the higher peak of the very active twin volcanoes Lokon and Empung. The latter peak last erupted from its summit crater some time around 1775 (give or take 25 years or so), but all 24 subsequent eruptions listed by the Global Volcanism Program (and the current activity) have originated from Tompaluan Crater, situated in the saddle between the two peaks. Most of these eruptions were VEI 1 or 2, although eruptions in July 1951 to March 1953, May 1991 to January 1992 and September 2003 were VEI 3.

More up-to-date coverage of this eruption is available at Earthquake-Report.com.

News
Peringatan kemenhub: Lokon meletus, maskapai miminta waspadaTribun Manado, 15 July 2011
Thousands evacuated as Sulawesi volcano eruptsJakarta Globe, 15 July 2011
Indonesians flee volcano eruption on Sulawesi – BBC News, 15 July 2011
Indonesia’s Mount Lokon erupts, thousands take refuge – Reuters India, 15 July 2011

Information
Global Volcanism Program: Lokon-Empung – summary information for Lokon-Empung (0606-10=)
Volcanological Survey of Indonesia – information and status reports in Indonesian

The Volcanism Blog

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