Phreatic explosion at Poás volcano in Costa Rica. The volcano produced a half kilometer (~1500 foot) plume that rained ash on the national park that surrounds the volcano.
Global volcano activity:
Earthquake activity in or near the upper eastern rift zone of Kilauea volcano on Hawaii has been increasing. A magnitude 3 quake occurred in the northern part of the caldera today. Lava flows southeast of Pu`u `O`o continued to be weakly active on the coastal plain.
Popocatépetl in Mexico has been decreasing again after rising over the past week. During 27-28 Oct, there was only about 1 emission per hour. A few of them produced small ash plumes.
Fuego volcano in Guatemala has a few weak explosions and continues to alimentate the lava flow towards the Ash Canyon which is now about 400 m long.
Few weak ash explosions occur from the Santiaguito lava dome and the block lava flows from its summit vent remain weakly active – Guatemala.
Occasional small ash eruptions continue to occur at Galeras volcano in Colombia, such as today.
A thermal hotspot can still be seen at Michael volcano in the South Sandwich Islands.
In the past days Sakurajima volcano in Japan returned to average levels of activity and produced 1-2 mild explosions per day.
Global Volcano Activity:
The lava lake at Kilauea volcano on Hawai’i within Halema‘uma‘u crater remains at high levels, although the inflation-deflation cycle has now entered deflation and the lake level has slightly dropped. Elevated earthquake activity continues to appear beneath the upper eastern rift zone.
In Mexico, Popocatépetl’s activity has increased again with about 2-3 explosions per hour. Some of these produce ash clouds rising up to 2 km height. An explosion during the night of 25-26 Oct ejected numerous incandescent bombs to the upper outer flanks of the volcano.
Fuego volcano in Guatemala has mainly had effusive activity the past days with the lava flow towards the Ash Canyon increasing in length again to now about 600 m.
During 25-26 Oct, Sakurajima volcano in Japan had 2 relatively strong explosions sending ash to more than 3 km altitude (10-11,000 ft).
Elevated surface temperatures were detected at Cleveland volcano in the Aleutian Islands, perhaps related to a new phase of lava dome growth. Seismic activity remains elevated at Iliamna and Little Sitkin volcano, but there have not been any other signs of activity recorded.
In Kamchatka: Shiveluch volcano’s lava dome continues to grow slowly and explosions could occur any time. According to video data, the volcano is steaming and there is incandescence above the dome. Seismicity is moderate, and satellite data show a thermal anomaly. A hot spot continues to be visible at Karymski volcano, seismicity is moderate and KVERT reports a possible small eruption with ash to 3,000 ft / 4 km altitude yesterday. Moderate seismicity, a visible weak steam plume and a thermal anomaly detectable on satellite data suggest that mild strombolian activity continues in the summit crater of Klyuchevskoi volcano. A thermal anomaly remains visible at Bezymianny although KVERT has not detected seismic activity recently. Activity at Kizimen has decreased over the past weeks, but incandescence, steaming and moderate seismicity continue to be registered, confirming that the lava dome remains active.
Alaid volcano in the Northern Kuriles continues to show a thermal hot spot and steaming could be observed from neighboring Paramushir Island.
The submarine eruption of Havre Seamount in the Kermandec archipelago discovered 9 Aug has been confirmed by direct observation. NZ scientists used multibeam sonar to map the seamount and found evidence of a new volcanic cone, 240 m tall and reaching withing 1,100 m below sea level, built on the side of the large submarine caldera of Havre volcano.
Weekly roundup of new and continuing activity:
New Activity/Unrest: Alaid, Kuril Islands (Russia) | Kliuchevskoi, Central Kamchatka (Russia) | Raung, Eastern Java (Indonesia)
Ongoing Activity: Fuego, Guatemala | Galeras, Colombia | Karymsky, Eastern Kamchatka (Russia) | Kilauea, Hawaii (USA) | Little Sitkin, Aleutian Islands | Pagan, Mariana Islands | Popocatépetl, México | Sakura-jima, Kyushu | Shiveluch, Central Kamchatka (Russia)
Global volcanic activity:
Popocatépetl’s activity in Mexico remains stable with about 2 weak explosions per hour. Most of these only produce steam plumes, only the stronger ones are accompanied by weak ash plumes. Crater glow is visible at night and a significant SO2 emission indicates that magma continues to rise in the volcano.
Explosive activity from Fuego volcano, Guatemala is increasing in favor of effusive. Since yesterday, there have been 13 weak to moderate explosions with ash rising up to 1000 m. The lava flow towards the Ash Canyon is still active and now 400 m long.
A mild ash explosion from the Santiaguito lava dome [Guatemala] occurred this morning with a weak plume rising to 3100 m altitude. Activity otherwise remains mainly effusive. The thick block lava flows that descend from the summit are still weakly active and produce avalanches of rocks detaching from their fronts.
Heavy rainfalls around Tungurahua volcano in Ecuador triggered lahars one of which damaged the Baños-Penipe road.
The seismic swarm in the Tjörnes Fracture Zone north off Iceland continues and the Icelandic Civil protection issued warning about the possibility of a larger earthquake.
Global volcanic activity:
Within the past few days, the lava lake at Kilauea volcano on Hawai’i within Halema‘uma‘u crater has risen to a record levels. 1 year ago the lake was 70m/230ft deep, 1 month ago it was 60m/200ft deep, 1 week ago it was 50m/165ft deep, and today it sits only 33m/110ft deep!
Elevated surface temperatures were detected at Cleveland volcano in Kamchatka on 19 and 22 October, this may be related to a period of lava dome growth at the volcano.
Lokon volcano in North Sulawesi erupted again on Saturday (20/10/2012) at around 01:33 am in the morning. According to a news article, ejecta were seen rising 400 m from the observatory and the eruption lasted for about 70 seconds.
Paluweh volcano (Rokatenda) volcano on Flores (Indonesia) is still showing some activity. A Modis satellite image taken on Monday, 22 October showed a gas plume containing ash drifting 80 KM west of the volcano.
Popocatépetl’s activity in Mexico has decreased again. During 22-23 Oct, 39 small explosions, some with weak ash plumes, were recorded. Crater glow is still visible at night, and some small earthquakes continue under the volcano.
The lava flow from Fuego volcano is decreasing and now only 600 m long. As effusive activity weakens, more explosions seem to occur. INSIVUMEH counted 6 weak events during 22-23 Oct with ash plumes rising about 500 m.
Seismic activity remains elevated at Sotará volcano in Colombia and INGEOMINAS keeps a close watch on the volcano. A swarm on 17 Oct contained over 700 small quakes.
The seismic swarm in the Tjörnes Fracture Zone north off Iceland continues at reduced rate. According to the Icelandic Meteorological Office, there is enough stress to produce a magnitude 6.8 earthquake, but it is impossible to predict if and when such a quake might occur.
Global volcanic activity:
The seismic swarm at the Tjörnes Fracture Zone in Iceland continues but at lower pace.
Popocatépetl in Mexico had 85 weak to moderate explosions during 21-22 October, a bit less than previously. Only some of them were accompanied by fine ash emissions. Small earthquakes continue to be recorded under the volcano and a strong SO2 plume is regularly visible on satellite data.
An SO2 plume from Turrialba volcano in Costa Rica could be seen on yesterday’s NOAA SO2 monitoring image for Central America, suggesting elevated degassing activity.
Fuego volcano’s lava flow is 800 m long and some weak explosive activity has resumed.
Occasional ash emissions with plumes up to 1200 m high have been observed and photographed at Galeras volcano in Colombia on 19 and 21 October. Seismic activity, however, remains low with only few occasional events visible on the seismograms.
Raung volcano in East Java shows increasing seismic activity including strong volcanic tremor and the alert level of the volcano was raised to 3 out of 4 (Siaga, “eruption warning”). The Indonesian Volcanological Survey recommends not to approach the volcano’s summit within 3 km.
Strong SO2 emissions are visible from Bagana volcano in Papua New Guinea.
The following new activity/unrest was reported at the following volcanos:
Alaid, Kuril Islands (Russia) | Gamalama, Halmahera | Kliuchevskoi, Central Kamchatka (Russia) | Paluweh, Lesser Sunda Islands (Indonesia) | Sangeang Api, Lesser Sunda Islands (Indonesia).
Etna, Sicily (Italy) | Fuego, Guatemala | Galeras, Colombia | Karymsky, Eastern Kamchatka (Russia) | Kilauea, Hawaii (USA) | Manam, Northeast of New Guinea (SW Pacific) | Popocatépetl, México | Sakura-jima, Kyushu | Santa María, Guatemala | Shiveluch, Central Kamchatka (Russia) | Tongariro, North Island (New Zealand).
El Hierro volcano off the Canary Islands has experienced a new swarm of small quakes (10 so far) which started this morning under the centre of the island. The earthquakes are located at about 10 km depth.
East Nusa Tenggara Volcano in Idonesia erupts. Hundreds of villagers near Mount Rokatenda on Palue Island in Sikka, East Nusa Tenggara, have been evacuated.
New Activity/Unrest has been reported at the following volcanos:
Fuego, Guatemala | Lokon-Empung, Sulawesi | Paluweh, Lesser Sunda Islands (Indonesia) | Suwanose-jima, Ryukyu Islands (Japan) | Tengger Caldera, Eastern Java (Indonesia)
Bagana, Bougainville | Batu Tara, Komba Island (Indonesia) | Galeras, Colombia | Karymsky, Eastern Kamchatka (Russia) | Kilauea, Hawaii (USA) | Manam, Northeast of New Guinea (SW Pacific) | Sakura-jima, Kyushu | Shiveluch, Central Kamchatka (Russia)
When NASA’s Terra satellite passed over Russia’s Kamchatka Peninsula at noon local time (00:00 Universal Time) on October 6, 2012, Shilveluch Volcano was quiet (top image). By the time NASA’s Aqua satellite passed over the area two hours later (bottom image), the volcano had erupted and sent a plume of ash over the Kamchatskiy Zaliv.
Mount Lokon in North Sulawesi province erupted on Sunday afternoon as heavy rain fell around its cloud-covered crater. The sound was heard 5 kilometers away but the height of the eruption was not visible. The volcano spewed smoke and ash and caused muddy rain to fall in nearby villages.
A new earthquake swarm has started yesterday at the El Hierro undersea volcano off the Canary Islands. The number of quakes rose from an average of about 8-10 to 23 quakes. Most of them are weak and located at around 10 km depth in the western El Golfo area.
The following new activity/unrest has been reported at the following volcanos:
Havre Seamount, SW Pacific | Fuego, Guatemala | Marapi, Sumatra (Indonesia) | Tongariro, North Island (New Zealand)
Bagana, Bougainville | Batu Tara, Komba Island (Indonesia) | Galeras, Colombia | Karymsky, Eastern Kamchatka (Russia) | Kilauea, Hawaii (USA) | Popocatépetl, México | Sakura-jima, Kyushu | Santa María, Guatemala | Shiveluch, Central Kamchatka (Russia)