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SI/USGS Weekly Volcanic Activity Report 8-14 September 2010 16 September 2010

Posted by admin in activity reports, Alaska, Arenal, Batu Tara, Caribbean, Chile, Cleveland, Colombia, Costa Rica, Dukono, Ecuador, Ekarma, eruptions, Guatemala, Hawaii, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kliuchevskoi, Nevado del Huila, Planchón-Peteroa, Reventador, Russia, Sakura-jima, Sangay, Santa María, Shiveluch, Sinabung, Soufrière Hills, Suwanose-jima, United States, Weekly Volcanic Activity Reports.
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The Global Volcanism Program has put together a bumper Weekly Volcanic Activity Report for 8-14 September 2010. Sally Kuhn Kennert of the GVP compiled the report. Some highlights:

  • Nevado del Huila: alert level raised following increase in seismicity and gas/ash emissions
  • Soufrière Hills: several small-to-moderate pyroclastic flows descended the dome and took parts of it down with them
  • Arenal: rumbled its way through August with gas emissions, strombolian eruptions and avalanches
  • Sinabung: threw ash plumes up to 4.3-4.6 km altitude

SI/USGS Weekly Volcanic Activity Report 8-14 September 2010

Click on the map for a larger version (1280 x 898 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 8-14 September 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: Cleveland (Alaska, USA), Ekarma (Russia), Kliuchevskoi (Russia), Nevado del Huila (Colombia), Planchón-Peteroa (Chile), Santa María (Guatemala), Sinabung (Indonesia).

Ongoing activity: Arenal (Costa Rica), Batu Tara (Indonesia), Dukono (Indonesia), Karymsky (Russia), Kilauea (Hawaii USA), Reventador (Ecuador), Sakura-jima (Japan), Sangay (Ecuador), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan).

Note: a.s.l. = ‘above sea level’.

NEW ACTIVITY/UNREST

Cleveland (Alaska, USA). AVO reported that during 7-8 September clear-weather satellite views of Cleveland showed no thermal anomalies or recent deposits on the flanks. The Volcano Alert Level and the Aviation Colour Code were lowered to Unassigned. On 11 September, a thermal anomaly was observed in satellite imagery. The next day a possible ash plume seen in satellite imagery rose to the estimated altitude of 7.6 km (25,000 ft) a.s.l. and drifted E. The Volcano Alert Level and the Aviation Colour Code were again raised to Advisory and Yellow, respectively. A thermal anomaly was again visible during 13-14 September. [GVP: Cleveland]

Ekarma (Russia). On 13 September, SVERT reported that strong steam-and-gas activity from Ekarma continued. Ekarma does not have a seismic network; satellite image analysis and infrequent ground observations are the primary tool for monitoring many of the Kuril Islands volcanoes. [GVP: Ekarma]

Kliuchevskoi (Russia). KVERT reported that during 3-10 September seismic activity from Kliuchevskoi was above background levels and lava  flowed down the SW and NW flanks. Satellite imagery analyses showed a large and intense daily thermal anomaly over the volcano. During 2-4 September ash plumes seen in satellite imagery drifted 150 km S and SW at an altitude of 6.5 km (21,300 ft) a.s.l. Phreatic bursts on the SW flank were observed on 5 September and Strombolian  activity was seen during 5-7 September. Seismic data suggested that during 5-6 September ash plumes rose to an altitude of 6 km (19,700 ft) a.s.l. [GVP: Kliuchevskoi]

Nevado del Huila (Colombia). The Popayán Volcano Observatory (INGEOMINAS) reported increased activity from Nevado del Huila on 8 and 9 September. Pulses of tremor were associated with periodic emissions of gas, ash, and incandescent material observed with the Tafxnú and Maravillas web cameras. During 8-14 September plumes of steam and occasionally ash rose as high as 2 km above the summit. The Alert Level was raised to II (Orange; “probable eruption in term of days or weeks”). [GVP: Nevado del Huila]

Planchón-Peteroa (Chile). SERNAGEOMIN reported that an overflight of Planchón-Peteroa on 7 September revealed that the explosions the day before were possibly phreato-magmatic in origin and similar to the explosions in 1991. Pulses of gas and ash  had occurred every 40-60 seconds during the eruption. Plumes rose 200 m above the crater and ash mostly fell within 10 km to the E. During 10-13 September, plumes rising from the vent  had progressively less ash and higher concentrations of water vapor. On 13 September, SERNAGEOMIN reported that petrographic and mineralogical studies of the ash indicated no juvenile components. The Alert Level remained at 4, Yellow. [GVP: Planchón-Peteroa]

Santa María (Guatemala). INSIVUMEH reported that an eruption from Santa María’s Santiaguito lava dome complex on 11 September generated two pyroclastic flows  that traveled 3 km SW and deposited material in the Nimá II drainage. Ash plumes rose 1 km above the crater and drifted E and SE. On 13 September white plumes rose 100 m and drifted S. [GVP: Santa María]

Sinabung (Indonesia). CVGHM reported that during 8-11 September Sinabung emitted white-to-grey plumes that rose 30-100 m above the crater and generally drifted E. Deformation measurements during 8-14 September showed a slow rate of inflation. Based on analyses of satellite imagery and the CVGHM web camera, the Darwin VAAC reported that on 12 and 14 September ash plumes rose to altitudes of 4.3-4.6 km (14,000-15,000 ft) a.s.l. The Alert Level remained at 4 (on a scale of 1-4). [GVP: Sinabung]

ONGOING ACTIVITY

Arenal (Costa Rica). OVSICORI-UNA reported that during August activity originating from Arenal’s Crater C consisted of gas emissions, sporadic Strombolian  eruptions, and occasional avalanches. Some of the Strombolian eruptions caused glass to vibrate in buildings located 6.5 km NE. Block avalanches descended the N and NE flanks. Acid rain and small amounts of ejected pyroclastic material affected the NE, E, and SE flanks. Crater D produced only fumarolic activity. [GVP: Arenal]

Batu-Tara (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that on 8 September an ash plume from Batu Tara rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 55 km NW. [GVP: Batu Tara]

Dukono (Indonesia). Based on analyses of satellite imagery, the Darwin VAAC reported that during 8-11 and 14 September ash plumes from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 35-95 km SW, W, and NW. [GVP: Dukono]

Karymsky (Russia). KVERT reported that during 3-10 September seismic activity from Karymsky was above background levels and suggested that possible ash plumes rose to an altitude of 3.2 km (10,500 ft) a.s.l. Satellite imagery showed a thermal anomaly over the volcano during the week. The Aviation Colour Code level remained at Orange. [GVP: Karymsky]

Kilauea (Hawaii, USA). During 8-14 September HVO reported that activity at Kilauea continued from the summit caldera and the east rift  zone. At the summit caldera, the level of the lava-pool surface in the deep pit within the floor of Halema’uma’u crater remained mostly stable; glow from the vent was also visible at night. A plume from the vent drifted SW and deposited ash, and occasionally Pele’s hair and spatter, nearby. At Pu’u ‘O’o crater, incandescence emanated from a lava  flow on the SW floor on most nights. During an overflight on 9 September, geologists saw that the lava flow had ponded on the W side of the crater floor. At the east rift zone, lava that flowed through the TEB lava-tube system mainly fed the Puhi-o-Kalaikini ocean entry. [GVP: Kilauea]

Reventador (Ecuador). The Washington VAAC reported that on 9 September an ash plume from Reventador at an altitude of 5.5 km (18,000 ft) a.s.l. was observed by a pilot. [GVP: Reventador]

Sakura-jima (Japan). Based on information from JMA, the Tokyo VAAC  reported that explosions from Sakura-jima on 8 and 10 September produced plumes that rose to altitudes of 1.5-1.8 km (6,000-8,000 ft) a.s.l. Some of the plumes drifted E and NE. On 9 September a pilot reported that an ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. [GVP: Sakura-jima]

Sangay (Ecuador). The Washington VAAC  reported that on 10 September a small plume and a thermal anomaly from Sangay were seen in satellite imagery. Based on information from Tegucigalpa MWO, pilot observations, and analyses of satellite imagery, the VAAC reported that on 13 September small plumes of gas with possible ash drifted SW. A thermal anomaly had also been detected for the previous few hours. [GVP: Sangay]

Shiveluch (Russia). KVERT reported that during 3-10 September seismic activity from Shiveluch was above background levels and suggested that possible ash plumes rose to an altitude of 6.5 km (21,300 ft) a.s.l.  during 3-4 September. Gas-and-ash plumes were observed on 6 and 7 September; clouds prevented observations on the other days. Satellite imagery analysis showed a thermal anomaly on the volcano during the week. The Aviation Colour Code level remained at Orange. [GVP: Shiveluch]

Soufrière Hills (Montserrat). MVO reported that several small-to-moderate sized pyroclastic flows  from Soufrière Hills during 3-10 September removed parts of the cold dome carapace, resulting in the thermal camera displaying several hotter regions on the lava dome. The largest pyroclastic flow traveled 2.5 km down the Gages valley to the W on 9 September. The Hazard Level remained at 3. [GVP: Soufrière Hills]

Suwanose-jima (Japan). Based on information from JMA, the Tokyo VAAC reported an explosion from Suwanose-jima on 11 September. Details of possible resulting plumes were not reported. [GVP: Suwanose-jima]

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 8-14 September 2010. 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. 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

Comments

1. Boris Behncke, Catania, Italy - 16 September 2010

I just would like to drop this note – Ralph great you’re back to full activity! Obviously we have the excellent Eruptions blog but yours, rather than competing, is doing a phantastic job in complementing it.

2. Rubén - 16 September 2010

Hello.
There is a new webcam in OVDAS site: Planchón-Peteroa from Romeral’s station: http://www2.sernageomin.cl/ovdas/ovdas7/webcam_romeral.html

3. admin - 16 September 2010

Boris: thank you!

Rubén: thanks for the tip about the Planchón-Peteroa webcam, I’ll add a quick post giving that link.

4. Guillermo - 16 September 2010

Rubén, you take off that from the tip of my tongue :-)
The OVDAS page NEEDS a ‘fashion emergency’ soon.

5. Dorothy Kether - 16 September 2010

I’d like to subscribe

6. A Blog Expert - 16 September 2010

What do you want to subscribe to, Dorothy?

7. Rubén - 17 September 2010

admin: you are welcome.

Guillermo: I agree with you, Guillermo, OVDAS page must be redesigned.
I saw the change in the page using the UpdateScanner (a Firefox extension)

8. parclair - 17 September 2010

Heh, I came to write a note thanking you for writing the blog again, and Boris beat me to it. Thanks so much. I especially appreciate how you present the weekly volcano report– i’ve never quite got the hang of finding the new reports easily, but I know I can turn to your blog for an easy read. Thanks for all the other reports, quotes and pictures.


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