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Chile: yellow alert at restless Llaima 6 December 2009

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The Chilean state emergencies office ONEMI (Oficina Nacional de Emergencia) has declared a Yellow Alert for Llaima volcano and surrounding communities. According to an ONEMI bulletin issued yesterday, monitoring of the volcano by SERNAGEOMIN’s Observatorio Vulcanológico de los Andes del Sur (OVDAS) between 14 November and 1 December showed ‘continuing emission of water vapour, volcanic gases and background tremor’. This marks an increase in activity since mid-November – the appearance of background tremor is particularly significant. The bulletin reports that ‘considering the continuing obstruction of the main crater, and the appearance of these new types of seismic events, [OVDAS] indicates that these background conditions increase the likelihood of a possible eruptive reactivation of Llaima volcano, within the next few weeks’.

The Yellow Alert applies to the communities of Melipeuco, Cunco, Vilcún, Curacautín and Lonquimay: the authorities in these municipalities, along with those of the Conguillío National Park (within which Llaima is situated) are required to update and apply their emergency contingency plans and co-ordinate theire response with the local bureau of ONEMI. An exclusion zone of 4 km radius, centred on Llaima’s main crater, is in operation around the volcano itself.

In a further bulletin ONEMI clarifies that the effects of the increased alert level at Llaima are restricted to the enforcement of the exclusion zone around the volcano and more intensive monitoring of its activity, and that ‘the new Alert status does not create new restrictions on the normal activities of the population’.

UPDATE. The increased alert level ‘is a minor issue’ says the Intendenta of Araucanía Region, imposed by SERNAGEOMIN in response to a change in seismic behaviour: ‘this measure is not to alarm the community  but is an alert to the [monitoring] teams to remain vigilant’.

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

News
Declaran alerta amarilla por actividad del volcán en ChileEl Financiero, 5 December 2009
Chile decreta alerta amarilla en torno a volcán LlaimaEl Comercio, 5 December 2009
Alerta en Chile por posible erupción del volcán LlaimaLa Nación, 5 December 2009
Alerta amarilla por riesgo de erupción del volcán Llaima – Europa Press, 6 December 2009
Llaman a la calma ante aumento de actividad del volcán Llaima – 123 Chile, 6 December 2009

Information
Global Volcanism Program: Llaima – summary information for Llaima (1507-11=)
Oficina Nacional de Emergencia – Chilean government emergencies office
SERNAGEOMIN – Servicio Nacional de Geología y Minería, Chile
Proyecto Observación Visual Volcán Llaima – Llaima Visual Observation Project

The Volcanism Blog

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Catching up with Chaitén (and Llaima) 20 November 2009

Posted by admin in activity reports, Chaitén, Chile, eruptions, Llaima.
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While we wait for SERNAGEOMIN to get around to publishing the latest Chaitén bulletins (which eventually appear as PDFs at the OVDAS site), two brief reports have appeared on the press page of SERNAGEOMIN’s main site, dated 9 November and 16 November, the latter economically combined with a report on Llaima. Translations as follows.

SERNAGEOMIN bulletin on Chaitén volcano
9 November 2009 [original here]

Between 16 and 30 October the eruptive activity of Chaitén volcano, both visually and seismically, has shown no large changes, continuing the developments of the last period. The preceding indicates that the eruptive activity continues with the growth of the dome complex.

On the other hand, the quantity of pyroclastic material both from rock falls and emitted by the block-and-ash flows and lateral explosions has created large accumulations in the adjacent valleys and particularly the valley of the Chaitén river, so that the occurrence of lahars towards Chaitén during periods of intense rain cannot be ruled out.

In consequence, given that the seismicity remains at elevated levels – an effect of the growth of the dome complex – and that the eruptive activity continues with the possibility of the generation of block-and-ash flows in random directions, which may affect surrounding valleys with the generation of new lahars, SERNAGEOMIN suggests maintaining Volcanic Red Alert.

Chaiten 30 October 2009
View from the DGAC camera in Chaitén on 30 October. In general, the base of the column appears much wider, although its height does not exceed 1.5 km above the domes.

SERNAGEOMIN bulletin on Chaitén and Llaima volcanoes
16 November 2009 [original here]

The images observed through the DGAC camera located in Chaitén to the south of the volcano show that during 31 October and 1 November the eruption has continued to produce one column, principally consisting of water vapour with occasional gas and ash. Because of the predominant winds in the area the height of the column has not exceeded 1000 metres above the dome complex. During the rest of the reporting period the continuing [cloud] cover has prevented any visual observation of the activity.

Chaiten 31 October 2009 (left), 1 November 2009 (right)
Images from the DGAC camera in Chaitén on 31 October (left) and 1 November (right).

Between 31 [October] and 1 November the seismicity has remained relatively stable compared with the preceding weeks indicating that the eruptive activity continues with the growth of the dome complex, only rarely observable recently because of the poor weather conditions in the area.

In consequence, given that the seismicity remains at elevated levels, an effect of the growth of the dome complex, and that the eruptive activity continues with the possibility of the generation of block-and-ash flows in random directions which may affect surrounding valleys with the generation of new lahars, SERNAGEOMIN suggests maintaining Volcanic Red Alert.

Llaima volcano

The poor meteorological conditions did not permitt visual observation of Llaima up to 10 November when it was possible to observe that the weak emissions of water vapour around the principal crater and on the east side of the volcano continue, probably due to the melting of snow deposited in these locations.

Although the seismic activity has shown a slight decline in the number of LP earthquakes, its general characteristics have shown the same behaviour as during the preceding period and apparently the principal crater remains obstructed. Given these conditions, it is not possible to rule out a reactivation of the volcano.

In consequence, SERNAGEOMIN maintains Alert Level Green 2 and continues with permanent monitoring of the volcano, and suggests keeping the 4 km radius of exclusion around the principal crater.

Additionally it is reiterated that this alert could change suddenly, depending on the activity observed/registered at the volcano, so that it is recommended that community preparations are maintained along with the revision and updating of emergency plans.

[End of SERNAGEOMIN bulletins.]

For all our Llaima coverage: Llaima « The Volcanism Blog.
For all our Chaitén coverage: Chaitén « The Volcanism Blog.

Information
Global Volcanism Program: Chaitén – summary information for Chaitén (1508-41)
Erupción del Volcán Chaitén – extensive coverage of the Chaitén eruption
Global Volcanism Program: Llaima – summary information for Llaima (1507-11=)
Proyecto Observación Visual Volcán Llaima – Llaima Visual Observation Project
SERNAGEOMIN – Servicio Nacional de Geología y Minería, Chile

The Volcanism Blog

SERNAGEOMIN updates for Llaima (22 Aug-1 Sept) and Chaitén (20-31 Aug) 8 September 2009

Posted by admin in activity reports, Chaitén, Chile, eruptions, Llaima.
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The Chilean state geological service SERNAGEOMIN has published a joint bulletin covering activity at Llaima and Chaitén volcanoes. The Llaima report covers the period 22 August to 1 September, and the Chaitén report covers 20-31 August. Translation as follows.

SERNAGEOMIN bulletin on Chaitén and Llaima volcanoes
Monday 7 September 2009

Llaima volcano

Although the seismicity of Llaima volcano has remained stable during the period between 22 August and 1 September, with RSAM values within normal ranges, sudden changes cannot be ruled out, possibly associated with instability in the magma column, which can be inferred from the marked instability in behaviour shown by the volcano during recent months. As a result, there is the continuing latent possibility of a volcanic reactivation.

In consequence, SERNAGEOMIN maintains Alert Level Green II and suggests keeping an exclusion zone of 4 km radius around the principal crater. It should be noted that OVDAS personnel are constantly attentive to the development of the volcano’s activity. It is reiterated that this alert could change suddenly, therefore it is recommended that the community stay prepared for any changes in activity that may occur and for corresponding revision and updating of emergency plans.

Laima volcano, 1 September 2009 (photographs by Victor Hazeldine)
Photographs taken by Victor Hazeldine on 01-09-2009.

Chaitén volcano

For its part, the eruptive activity of Chaitén in the period between 20 and 31 August continued with the growth of the dome complex, which was only occasionally observed because of the winter weather conditions.

The images recorded by the DGAC camera, located in Chaitén, to the south of the volcano, show that the eruption continues in unchanging form with a column of gas and ash climbing, occasionally, to 1.5 km above the dome complex. Also block-and-ash flows persist, indicating that this structure continues to grow, particularly towards the western sector of the caldera.

The quantity of deposited pyroclastic material both from volcanic rocks that have been emitted by the block-and-ash flows and from lateral explosions have created large accumulations in the adjacent valleys and especially the Chaitén river valley, so that the occurrence of lahars towards Chaitén [town] during intense rains cannot be ruled out.

In consequence, given that the seismicity remains at high levels – an effect of the growth of the dome complex – and that the eruptive activity persists with the possibility of the generation of block-and-ash flows in random directions, which may affect the surrounding valleys and generate new lahars, SERNAGEOMIN suggests maintaining Volcanic Red Alert.

[End of SERNAGEOMIN bulletin.]

For all our Llaima coverage: Llaima « The Volcanism Blog.
For all our Chaitén coverage: Chaitén « The Volcanism Blog.

Information
Global Volcanism Program: Chaitén – summary information for Chaitén (1508-41)
Erupción del Volcán Chaitén – extensive coverage of the Chaitén eruption
Global Volcanism Program: Llaima – summary information for Llaima (1507-11=)
Proyecto Observación Visual Volcán Llaima – Llaima Visual Observation Project
SERNAGEOMIN – Servicio Nacional de Geología y Minería, Chile

The Volcanism Blog

Llaima update from POVI 2 September 2009

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Llaima, 1 September 2009 (image copyright Victor Hazeldine, POVI)

The picture of Llaima above was taken by Victor Hazeldine on 1 September 2009 and comes from our friends at POVI (Proyecto Observación Visual Volcán Llaima). The view is of the east flank of the volcano, and shows abundant steam rising from thermally active areas around the summit. (Image copyright Victor Hazeldine.)

The following information about Llaima’s recent activity also comes from POVI:

The last summit eruption, as part of the current cycle started in may 2007, lasted 72 hour starting from April 4. The 3 block lava flows reached a total length of 12,5 km.

On April 24 and June 1st sporadic phreatic emission and red glow was observed from a 300 m long lateral active fissure on the eastern upper flank. Until mid July a weak red glow was observed on the western crater rim. The 350 m wide inner crater remains filled with pyroclasts and lava emitted during the long lasting current eruption cycle.

The following graphic shows the time table (chronology) of the current eruption cycle. Half column means weak to moderate ash eruption and/or lava flow (VEI 1). Long column means moderate to strong explosive strombolian eruption (VEI 2 -3).

Llaima: Cronograma de Manifestaciones Eruptivas - Mayo 2007 a Agosto 2009
[Click on the image above to see a larger version.]

Thanks, as ever, to all the team at POVI for keeping us up-to-date with developments at Llaima. For our report of the latest SERNAGEOMIN bulletin on Llaima, click here.

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

Information
Global Volcanism Program: Llaima – summary information for Llaima (1507-11=)
Oficina Nacional de Emergencia – Chilean government emergencies office
SERNAGEOMIN – Servicio Nacional de Geología y Minería, Chile
Proyecto Observación Visual Volcán Llaima – Llaima Visual Observation Project

The Volcanism Blog

Chaitén and Llaima updates from SERNAGEOMIN 1 September 2009

Posted by admin in activity reports, Chaitén, Chile, eruptions, Llaima.
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The Chilean state geological service SERNAGEOMIN has published brief updates on Chaitén and Llaima volcanoes on its website in a combined bulletin dated 31 August 2009. Translation as follows.

SERNAGEOMIN bulletin on Chaitén and Llaima volcanoes

Chaitén Volcano

In the period between 4 and 20 August the eruptive activity of Chaitén has continued with the growth of the dome complex – particularly towards the western sector of the caldera – observable only occasionally because of the winter season. The column of gases, composed of water vapour and ash, has occasionally risen to 1.5 km above the complex.

Moreover, the quantity of pyroclastic material from fallen volcanic rock originating from both block-and-ash flows and lateral explosions has formed important accumulations in the adjacent valleys and especially towards the valley of the Chaitén river, from which the fresh occurrence of lahars towards Chaitén during torrential rains cannot be ruled out.

In consequence, given that the seismic activity remains elevated as a result of the growth of the dome complex, with the possibility of the generation of block-and-ash flows which may affect the surrounding valleys including the new generation of new lahars, SERNAGEOMIN maintains Volcanic Red Alert.

Llaima Volcano

While seismicity at Llaima volcano tended to decrease in the early days of August, it has subsequently increased, slightly exceeding its usual values in this latest period (17-21 August). These oscillations in seismic activity (LP-type earthquakes [Long Period earthquakes] of high and low frequency) could be related to the rising and falling of the magma column located in the principal conduit of the volcano, demonstrating the instability of the magma column.

The absence of other types of seismic activity in this type of phenomenon suggests the existence of an unobstructed volcanic conduit, in which magmatic fluids can suddenly rise freely, bringing about a new eruptive phase.

Due to the markedly erratic behaviour which the volcano has shown during recent times, it is not possible to rule out its reactivation. Because of the foregoing, SERNAGEOMIN continues with Green Alert level 2, maintaining a 4-km radius of exclusion around the principal crater.

For all our Chaitén coverage: Chaitén « The Volcanism Blog.
For all our Llaima coverage: Llaima « The Volcanism Blog.

Information
Global Volcanism Program: Chaitén – summary information for Chaitén (1508-41)
Erupción del Volcán Chaitén – extensive coverage of the Chaitén eruption
Global Volcanism Program: Llaima – summary information for Llaima (1507-11=)
Proyecto Observación Visual Volcán Llaima – Llaima Visual Observation Project
SERNAGEOMIN – Servicio Nacional de Geología y Minería, Chile

The Volcanism Blog

Llaima: volcano quieter, alert level reduced 11 July 2009

Posted by admin in activity reports, Chile, eruptions, Llaima.
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Figure 1.
Above: Water vapour emanations produced by atmospheric condensation at Llaima’s summit on 7 July, from the lava flow that descended the western flank in the April eruption and hot areas of the upper part of the eastern flank (image: SERNAGEOMIN).

The most recent SERNAGEOMIN bulletin on Llaima (7 July 2009 – click here for PDF) reports a continuing decline in the volcano’s activity since the most recent eruptive period between April and June this year. Steam has been visible around the summit and from areas where lava flows descended the flanks in April (visible in the picture above), caused by atmospheric condensation rather than by volcanic activity. SERNAGEOMIN also reports a decline in seismicity, with the number and energy of long-period earthquakes falling since June.

Figure 2 - click to enlarge.

Above: Graph of seismic energy released between 6 June and 7 July, measured by the LAVE seismic station at Llaima. The high points on the right were produced by windy weather (SERNAGEOMIN).

Given the low levels of activity at Llaima over the last few weeks, SERNAGEOMIN has lowered the alert level from Yellow (Amarillo) to Green Level 2 (Verde Nivel 2), but warns that the danger of a reactivation of eruptive activity remains. A 4 kilometre radius exclusion zone has been imposed around the Llaima’s summit and SERNAGEOMIN are monitoring the volcano on a permanent basis.

The Chilean state emergencies office ONEMI have also issued a bulletin announcing that although the Yellow Alert has been lifted restrictions affecting access to the Conguillio National Park remain in place, and that recreational facilities within the park near Llaima’s summit will remain closed.

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

News
Autoridades levantan alerta amarilla en el volcán LlaimaLa Tercera, 10 July 2009
Autoridades levantaron alerta amarilla para el volcán Llaima – Radio Cooperativa, 10 July 2009

Information
Global Volcanism Program: Llaima – summary information for Llaima (1507-11=)
Oficina Nacional de Emergencia – Chilean government emergencies office
SERNAGEOMIN – Servicio Nacional de Geología y Minería, Chile
Proyecto Observación Visual Volcán Llaima – Llaima Visual Observation Project

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report, 3-9 June 2009 11 June 2009

Posted by admin in activity reports, Alaska, Batu Tara, Chaitén, Chile, Colombia, Dukono, Ecuador, eruptions, Fuego, Galeras, Guatemala, Hawaii, Japan, Kamchatka, Karangetang, Karymsky, Kelut, Kilauea, Llaima, Manam, Mexico, Pacaya, Papua New Guinea, Peru, Popocatépetl, Rabaul, Redoubt, Russia, Sakura-jima, Santa María, Shiveluch, Slamet, Tungurahua, Ubinas, United States, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 3-9 June 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 3-9 June 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Galeras (Colombia), Karangetang (Indonesia), Sangeang Api (Indonesia), Slamet (Indonesia).

Ongoing activity: Batu Tara (Indonesia), Chaitén (Chile), Dukono (Indonesia), Fuego (Guatemala), Karymsky (Russia), Kelut (Indonesia), Kilauea (USA), Llaima (Chile), Manam (Papua New Guinea), Pacaya (Guatemala), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Redoubt (USA), Sakura-jima (Japan), Santa María (Guatemala), Shiveluch (Russia), Tungurahua (Ecuador), Ubinas (Peru).

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Llaima: latest news and pictures 4 June 2009

Posted by admin in activity reports, Chile, eruptions, Llaima.
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From POVI (Proyecto Observación Visual Volcán Llaima) in Chile comes the following information and pictures of Llaima’s current activity.

The current cycle of strombolian activity at Llaima, which began in May 2007, is continuing. On 26 May 2009, after a period of unusually heavy rain, a 500-metre long fissure on the upper east flank of the volcano began to emit dense clouds of water vapour. On the following day, 27 May, small amounts of ash were observed mixed in with the water vapour, and on 28 May the vigour of the emissions and the ash content increased. The photograph below of the east flank, taken by Victor Hazeldine, shows the fissure and its emissions on 28 May.

Fissure on the upper east flank of Llaima volcano, with weak ash and water vapour emissions towards the north. (Image copyright Victor Hazeldine.)
Fissure on the upper east flank of Llaima volcano, with weak ash and water vapour emissions towards the north. (Image copyright Victor Hazeldine.)

On 1 June, after further bad weather, the energy of the intermittent emissions along the fissure increased. A powerful phreatic eruption began at 11:20 (local time) on 1 June. The eruption ceased by 12:00, and during that afternoon only one small subsequent eruption was observed.

Phreatic eruption at Llaima, 1 June 2009. Image captured at 11:23 local time (Image copyright POVI.)
Phreatic eruption at Llaima, 1 June 2009. Image captured at 11:23 local time (Image copyright POVI.)

In the early mornings the POVI surveillance camera at Melipeuco shows small, weak glowing points on the volcano, one on the western inner crater, and another sporadic point in the upper segment of the radial fissure. Since the phreatic fissure eruptions began seismicity has remained at normal levels (as measured by POVI instruments 20 km from the volcano) but the number and energy of LP (long period) earthquakes has increased.

Close-up view of phreatic activity at the radial fissure on the upper eastern flank of Llaima. Picture taken on 1 June 2009. (Image copyright Victor Hazeldine.)
Close-up view of phreatic activity at the radial fissure on the upper eastern flank of Llaima. Picture taken on 1 June 2009. (Image copyright Victor Hazeldine.)

The picture above, taken by Victor Hazeldine on 1 June, shows a rare close-up view of the phreatic activity at the fissure. The photograph was taken from a position south-south-east of the volcano, 12 km distant, and clearly shows the 500 m radial fissure on the upper east flank. During the night a small lava flow, divided into two parts, was visible at the top of the fissure.

[Many thanks to Werner Keller of POVI for providing this information and the above images exclusively to The Volcanism Blog. For copious and detailed coverage of Llaima, visit the POVI Llaima website.]

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

Information
Global Volcanism Program: Llaima – summary information for Llaima (1507-11=)
Oficina Nacional de Emergencia – Chilean government emergencies office
SERNAGEOMIN – Servicio Nacional de Geología y Minería, Chile
Proyecto Observación Visual Volcán Llaima – Llaima Visual Observation Project

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report, 27 May-2 June 2009 3 June 2009

Posted by admin in activity reports, Bagana, Batu Tara, Caribbean, Chaitén, Chile, Colombia, Dukono, Ecuador, eruptions, Etna, Hawaii, Indonesia, Italy, Japan, Kamchatka, Karangetang, Kilauea, Llaima, Makian, Nevado del Huila, Papua New Guinea, Popocatépetl, Rabaul, Redoubt, Russia, Sakura-jima, Shiveluch, Slamet, Soufrière Hills, Tungurahua, Ubinas, United States.
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SI/USGS Weekly Volcanic Activity Report 27 May-2 June 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 27 May-2 June 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Karangetang (Indonesia), Makian (Indonesia), Slamet (Indonesia).

Ongoing activity: Bagana (Papua New Guinea), Batu Tara (Indonesia), Chaitén (Chile), Dukono (Indonesia), Etna (Italy), Kilauea (Hawaii, USA), Llaima (Chile), Nevado del Huila (Colombia), Popocatépetl (Mexico), Rabaul (Papua New Guinea), Redoubt (Alaska, USA), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat), Tungurahua (Ecuador), Ubinas (Peru).

NEW ACTIVITY

Karangetang (Indonesia). 30-31 May, seismicity increased and tremor was detected. Diffuse white plumes rose 10-50 m and crater incandescence was seen on 30 May, white emissions rose 100 m above Utama Crater on 31 May, incandescent material descended as far as 2.3 m, mostly down S flank.

Makian (Indonesia). Seismicity, particularly tremor, increased during 28 May-2 June.

Slamet (Indonesia). 27 May, ash plume rose to 4.3 km a.s.l., possible plume rose to 6.1 km.

ONGOING ACTIVITY

Bagana (Papua New Guinea). 2 June, ash plume to 2.4 km a.s.l., drifted 75 km W.

Batu Tara (Indonesia). 27 May-2 June, ash plumes to 2.4 km a.s.l., drifted 25-75 km NW, W and SW; thermal anomaly detected 29 May.

Chaitén (Chile). 20-27 May, gas-and-ash plumes rose 1.5 km from the growing lava dome complex and collapses caused by instable slopes generated block-and-ash flows. Seismicity remained elevated with large hybrid earthquakes at 5-9 km beneath the western part of the dome complex. 28-29 May and 1-2 June, ash plumes rose to 1.8-2.4 km a.s.l.

Dukono (Indonesia). 27-28 May, ash plumes to 3 km a.s.l., drifted 55-110 km NE.

Etna (Italy). 25-31 May, the NW-SE-trending fissure E of the summit craters continued to produce active lava flows, There was degassing from the Northeast Crater, the NW and SE Bocca Nuova vents, from the E flank of the Southeast Crater and at summit fumarolic fields.

Kilauea (Hawaii, USA). 27 May-2 June, lava continued to flow SE through lava tubes to the Waikupanaha ocean entry and (until 31 May) the Kupapa’u ocean entry. Active surface lava flows were also detected on 30 May. The Halema’uma’u crater vent continued to produce a mainly white plume with an occasional brown tinge, that drifted mainly SW. A molten lava pool near the base of the cavity produced varying incandescence.

Llaima (Chile). A 2-square-kilometre area of elevated temperatures was observed on the E flank during an overflight on 1 June. Small areas of gas emission, a small cone in formation about 800 m below the crater and a 300-metre-long E-W-trending fissure 200 m from the rim of the main crater, emitting brown ash and steam plumes, were also observed. There were weak fumaroles at the summit crater.

Nevado del Huila (Colombia). A seismic swarm took place on 28 May that included magnitude 4 and 4.8 earthquakes. On 31 May an episode of tremor occurred associated with an ash emission, and a further pulse of tremor was detected on 2 June.

Popocatépetl (Mexico). 27 May-2 June, emissions of steam and gas observed, with slight amounts of ash during 27-29 May.

Rabaul (Papua New Guinea). 21-28 May, white and occasionally blue plumes from Tavurvur cone rose 1 km above the crater and incandescence from the summit crater was observed at night.

Redoubt (Alaska, USA). Seismicity remained low but above background 27 May-2 June. Lava dome growth continued.

Sakura-jima (Japan). An explosion on 30 May produced a plume to 4.6 km a.s.l. that drifted SE. On 31 May an ash plume rose to 3 km a.s.l., and on 1 June eruptions produced plumes to 2.1-3.4 km a.s.l, some of which drifted S.

Shiveluch (Russia). Seismic activity was above background levels 22-29 May; steam-and-gas emissions were observed 21-23 May, and plumes with small amounts of ash rose to 4 km a.s.l. on 22 May. A daily thermal anomaly was detected over the lava dome.

Soufrière Hills (Montserrat). Activity during 22-29 May was at a low level: a possible small explosion followed by a rockfall occurred on 23 May, and a small pyroclastic flow descended 1 km E on 24 May, producing an ash plume that drifted W.

Tungurahua (Ecuador). Strombolian activity was observed at night during 26-28 May, followed by nocturnal incandescence at the crater until 1 June. On 27-29 and 31 May thermal anomalies were detected. There was the usual range of noises: explosions, cannonades and roars. Steam-and-ash plumes rose to 7 km a.s.l. and drifted W and SW on 28 May, and ashfall was reported 28-30 May.

Ubinas (Peru). On 29 and 31 May eruptions produced ash plumes to 5.5-6.7 km a.s.l. that drifted NE and SW. A bluish gas plume with some ash content was reported on 1 June, and gas-and-ash plumes rose 0.9-1.5 km a.s.l. and drifted SE following an explosion on 2 June.

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 27 May-2 June 2009. It is provided for information only, and is based on but not a substitute for the full report, which comes with its own criteria and disclaimers. for the full report, which comes with its own criteria and disclaimers. The map base is derived from the Smithsonian Institution/USGS/US Naval Research Laboratory This Dynamic Planet website.

For all our coverage of the SI/USGS Weekly Volcanic Activity Reports: Weekly Volcanic Activity Reports « The Volcanism Blog.

The Volcanism Blog

SI/USGS Weekly Volcanic Activity Report, 20-26 May 2009 27 May 2009

Posted by admin in activity reports, Alaska, Barren Island, Batu Tara, Caribbean, Chaitén, Chile, Colima, Dukono, Ebeko, Ecuador, eruptions, Fuego, Guatemala, Hawaii, India, Indonesia, Japan, Kamchatka, Karangetang, Kilauea, Llaima, Mexico, Papua New Guinea, Peru, Rabaul, Redoubt, Reventador, Russia, Sakura-jima, Shiveluch, Slamet, Soufrière Hills, Suwanose-jima, Tungurahua, Ubinas, United States, Veniaminof, Weekly Volcanic Activity Reports.
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SI/USGS Weekly Volcanic Activity Report 20-26 May 2009

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 20-26 May 2009 is available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity: Karangetang (Indonesia), Reventador (Ecuador), Slamet (Indonesia)

Ongoing activity: Barren Island (India), Batu Tara (Indonesia), Chaitén (Chile), Colima (Mexico), Dukono (Indonesia), Ebeko (Russia), Fuego (Guatemala), Kilauea (Hawaii, USA), Llaima (Chile), Rabaul (Papua New Guinea), Redoubt (Alaska, USA), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan), Tungurahua (Ecuador), Ubinas (Peru), Veniaminof (Alaska, USA).

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