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Volcanic activity worldwide 7 Apr 2013: Batu Tara, Galeras, Paluweh, Sabancaya, Bagana, Tjörnes Fracture Zone

Sunday Apr 07, 2013 17:04 PM |

Earthquakes in the TFZ during the past 48 hours (Icelandic Met Office)
Earthquakes in the TFZ during the past 48 hours (Icelandic Met Office)
Small ash emission from Galeras yesterday (INGEOMINAS)
Small ash emission from Galeras yesterday (INGEOMINAS)
Numbers of earthquakes at Sabancaya over the past weeks (IGP)
Numbers of earthquakes at Sabancaya over the past weeks (IGP)
Tjörnes Fracture Zone (North of Iceland): The powerful earthquake swarm that started a week ago continues, but at reduced intensity compared to 2 April when the large magnitude 5.4 quake struck. Each day, hundreds of earthquakes have been occurring (more than 200 > magnitude 2 during the past 2 days).
The earthquake swarm is the result of release of tectonic stress that has accumulated in the crust and is being released at the moment. The area is one of the main so-called transform zones,- regions where the separating Eurasian and North-American tectonic plates move sideways along strike-slip faults rather than spreading apart directly as is the case in the main rift zones, where also the main volcanoes are located, because the opening movment here allows large batches of magma to rise easily.
... [read more]

Bagana (Bougainville Island, Papua New Guinea): A stronger eruptive phase has been occurring since last night. Several ash plumes reaching 10,000 ft (3 km) altitude have been observed drifting 45 nautical miles to the WSW (VAAC Darwin).

Batu Tara (Sunda Islands, Indonesia): Explosions continue with sometimes stronger ones that send ash to 7,000 ft (2.1 km) altitude on a daily basis now.

Paluweh (off Flores Island, Indonesia): Frequent ash emissions are being reported by VAAC Darwin. Today, ash plumes rose to 10,000 ft (3 km) altitude and drifted 45 nautical miles to the WSW.

Galeras (Colombia): Ash emissions have become more frequent since 4 April - the Pasto observatory has reported daily small explosions since then. This marks a significant increase in activity. Before, the volcano had produced such emissions only a few times per month since September 2012.
No corresponding increase in seismic activity was reported and the (official) alert level remains at yellow (corresponding to "orange"="minor activity" on the scale we use).

Sabancaya (Peru): Seismic activity has decreased at the volcano, the latest press release of IGP shows. It seems less likely now that the volcano will produce an eruption soon,- as in many cases, an intrusion has happened at depth without (so far) breaching the surface (= erupting).

Volcano Activity Summary for 7 Apr 2013:

Currently erupting:

Ambrym (Vanuatu): active lava lakes in several craters (updated 22 Mar 2013)
Bagana (Bougainville Island, Papua New Guinea): occasional ash explosions (updated 7 Apr 2013)
Batu Tara (Sunda Islands, Indonesia): strombolian explosions, ash plumes up to 500 m, extrusion of a small lava dome with rockfalls (updated 7 Apr 2013)
Colima (Western Mexico): frequent explosions from growing lava dome, glowing rockfalls and small pyroclastic flows (updated 30 Mar 2013)
Erebus (Antarctica): active lava lake in summit crater (updated 21 Jan 2012)
Erta Ale (Ethiopia): active lava lake in northern pit crater, active hornito with intermittend flow in southern crater (updated 11 Jan 2013)
Fuego (Guatemala): weak to moderate strombolian activity (updated 6 Apr 2013)
Gamalama (Halmahera): ash eruptions since 17 Sep (updated 17 Sep 2012)
Grozny (Iturup Island): fumarolic activity (updated 3 Apr 2013)
Heard (Australia, Southern Indian Ocean): possible lava lake in summit crater (updated 26 Mar 2013)
Karkar (Northeast of New Guinea): possible ash eruption on 1 February (updated 15 Mar 2013)
Kilauea (Hawai'i): lava lakes in Halemau'uma'u and Pu'u 'O'o, lava flows on coastal flat and weakly active ocean entries (updated 4 Apr 2013)
Kizimen (Kamchatka): growing lava dome, lava flow on eastern flank, avalanches (updated 4 Apr 2013)
Lokon-Empung (North Sulawesi, Indonesia): frequent small to moderate ash explosions (updated 4 Apr 2013)
Manam (Papua New Guinea): steaming, occasional ash venting (updated 27 Mar 2013)
Nyiragongo (DRCongo): active lava lake in summit crater (updated 2 Apr 2013)
Ol Doinyo Lengai (Tanzania): spattering and lava flows of natrocarbonatite lava inside the summit crater (updated 9 Dec 2012)
Pacaya (Guatemala): weak strombolian activity from Mackenney crater (updated 6 Apr 2013)
Paluweh (off Flores Island, Indonesia): active growing lava dome (updated 7 Apr 2013)
Rabaul (Tavurvur) (New Britain, Papua New Guinea): ash emissions, small explosions (updated 14 Mar 2013)
Sakurajima (Kyushu, Japan): 0-3 weak to moderate vulcanian-style explosions per day, ash clouds up to 2-3 km altitude (updated 6 Apr 2013)
Santa María / Santiaguito (Guatemala): advancing viscous active lava flows, weak occasional explosions (updated 6 Apr 2013)
Semeru (East Java, Indonesia): growing lava dome, ash venting and small to moderate explosions (updated 25 Jul 2012)
Shiveluch (Kamchatka): slow dome growth, occasional explosions and pyroclastic flows (updated 6 Apr 2013)
Stromboli (Eolian Islands, Italy): strong strombolian explosions, intermittent small lava overspills (updated 4 Apr 2013)
Tinakula (Santa Cruz Islands, Solomon Islands): increased activity at the volcano (updated 8 Feb 2013)
Tolbachik (Kamchatka): effusion of fluid lava flows (updated 4 Apr 2013)
Yasur (Tanna Island, Vanuatu): strong strombolian activity (level 3), crater currently closed (updated 12 Mar 2013)

Eruption warning / minor activity:

Bezymianny (Central Kamchatka Depression): slow lava flow extrusion from dome (updated 10 Mar 2013)
Chirpoi (Kurile Islands, Russia): thermal anomaly at summit crater, steaming (updated 9 Jan 2013)
Dieng (Central Java): increased degassing (updated 28 Mar 2013)
Dukono (Halmahera): thermal anomaly, probably small explosive activity in summit crater (updated 15 Mar 2013)
Etna (Sicily, Italy): 9th paroxysm from Etna's New SE crater (updated 5 Apr 2013)
Galeras (Colombia): ash emissions, small explosions (updated 7 Apr 2013)
Gorely (Southern Kamchatka): strong steaming (updated 10 Mar 2013)
Ibu (Halmahera, Indonesia): Thermal anomalies indicate continuing eruption, possible lava dome growth (updated 18 Oct 2012)
Karangetang (Siau Island, Sangihe Islands, Indonesia): hot spot visible at the summit (updated 27 Jan 2013)
Karymsky (Kamchatka): occasional small explosions, thermal anomaly (updated 4 Apr 2013)
Kirishima (Kyushu): degassing, slightly increased seismic activity (updated 30 Jul 2012)
Krakatau (Sunda Strait, Indonesia): occasional explosions (updated 1 Oct 2012)
Langila (New Britain, Papua New Guinea): occasional ash explosions (updated 11 Feb 2013)
Lascar (Northern Chile, Bolivia and Argentina): steam plumes with slight ash content (updated 4 Apr 2013)
Marapi (Western Sumatra, Indonesia): intermittent mild ash explosions (updated 17 Mar 2013)
Medvezhia (Kurile Islands, Russia): strong steaming, thermal anomaly (updated 17 Jan 2013)
Nevado del Ruiz (Colombia): steaming, weak ash venting (updated 28 Mar 2013)
Nyamuragira (DRCongo): Fort dégazage du cratère sommital (updated 27 Apr 2012)
Pagan (Mariana Islands): steaming, thermal anomaly (updated 12 Dec 2012)
Popocatépetl (Central Mexico): steam and ash emissions (updated 6 Apr 2013)
Rasshua (Central Kuriles)
Reventador (Ecuador): growing lava dome, lava flows on upper flank, frequent explosions (updated 6 Apr 2013)
Rincón de la Vieja (Costa Rica): small phreatic eruption on 11 April (updated 6 Oct 2012)
Sacabaya (Northern Chile, Bolivia and Argentina)
Sangay (Ecuador): no recent explosions reported (updated 25 Feb 2013)
Soputan (North Sulawesi, Indonesia): new eruption on 18 (updated 9 Nov 2012)
Suwanose-jima (Ryukyu Islands): steaming, occasional weak eruptions, elevated seismicity (updated 23 Feb 2013)
Telica (Nicaragua): ongoing seismic swarm (updated 6 Apr 2013)
Turrialba (Costa Rica): vigorous steaming, occasional phreatic explosions (updated 17 Mar 2013)
Ulawun (New Britain, Papua New Guinea): ash emissions and rumblings heard (updated 23 Mar 2013)
Villarrica (Central Chile): weak deep-seated explosive activity, steaming (updated 20 Jan 2013)
White Island (New Zealand): minor mud and steam explosions from the active crater (updated 28 Mar 2013)

Restless / uncertain activity:

Aoba (Vanuatu): minor phreatic activity from Lake Vui (updated 8 Feb 2013)
Askja (Central Iceland): increased seismicity (updated 27 Mar 2013)
Bárdarbunga (Iceland): earthquake swarm (updated 26 Jan 2013)
Barren Island (Indian Ocean)
Bromo (East Java, Indonesia): seismic unrest, steaming (updated 3 Oct 2012)
Campi Flegrei (Phlegrean Fields) (Italy): swarm of small earthquakes related to bradyseismus (updated 6 Feb 2013)
Chaitén (Southern Chile and Argentina)
Changbaishan (China / North Korea border): increased seismic and degassing activity, deformation (updated 29 Sep 2012)
Cleveland (Aleutian Islands, Alaska): lava dome growing (updated 9 Mar 2013)
Concepción (Nicaragua): seismic unrest (updated 23 Jan 2013)
Copahue (Chile/Argentina): seismic swarms (updated 19 Feb 2013)
Cumbal (Colombia): continuing seismic swarms (updated 31 Jan 2013)
El Hierro (Canary Islands, Spain): strong seismic swarm west of the island, inflation (updated 5 Apr 2013)
Gamkonora (Halmahera): alert level lowered to yellow (updated 14 Sep 2012)
Gaua (Vanuatu)
Guntur (West Java)
Hakone (Honshu)
Hekla (Iceland): seismic unrest (updated 26 Mar 2013)
Ijen (East Java, Indonesia): increased steaming and seismicity, alert level raised on 24 July (updated 3 Apr 2013)
Irazu (Costa Rica)
Iwo-jima (Volcano Islands): weak degassing, occasional volcanic tremors (updated 22 Jan 2013)
Katla (Southern Iceland): occasional seismic swarms (updated 17 Aug 2012)
Kerinci (Sumatra)
Ketoi (Kurile Islands, Russia)
Kliuchevskoi (Kamchatka): weak seismic activity (updated 19 Mar 2013)
Kuchinoerabu-jima (Ryukyu Islands)
Kverkfjöll (Eastern Iceland): occasional small earthquake swarms (updated 21 Oct 2012)
Laguna del Maule (Central Chile): seismic unrest, deformation (updated 9 Mar 2013)
Lewotobi (Flores): steaming and seismic activity decreased, alert lowered back to 1 (out of 4) (updated 5 Apr 2012)
Loihi (United States, Hawaiian Islands): Magnitude 4.2 earthquake at Loihi (updated 26 Nov 2012)
Machin (Colombia): elevated seismic activity (updated 28 Mar 2013)
Masaya (Nicaragua): elevated seismic activity (updated 31 Mar 2013)
Mauna Loa (Big Island, Hawai'i)
Mayon (Luzon Island): steaming, increased earthquakes, slight inflation (updated 11 Nov 2012)
Merapi (Central Java): Dome collapse sometime in October (updated 21 Oct 2012)
Mt Fuji (Honshu): earthquakes at the end of January and in February 2012, new craters reported, increasing fumarolic activity (updated 4 Feb 2013)
Nevado del Huila (Colombia): degassing (updated 31 Jan 2013)
Papandayan (West Java): alert status back to 2 (updated 1 Feb 2012)
Poas (Costa Rica): Small phreatic explosions on 29 October (updated 14 Mar 2013)
Raung (East Java): mild strombolian eruption inside the crater (updated 6 Apr 2013)
Reclus (Southern Chile and Argentina): increased number of earthquakes (updated 31 Aug 2012)
Rinjani (Lombok)
Sabancaya (Peru): degassing, earthquake swarm (updated 7 Apr 2013)
San Cristobal (Nicaragua): seismic unrest (updated 28 Mar 2013)
San Miguel (El Salvador): seismic unrest (updated 6 Apr 2013)
Sangeang Api (Indonesia): occasional weak steaming (updated 3 Jan 2013)
Sinabung (Sumatra, Indonesia)
Siple (Marie Byrd Land, Western Antarctica): possible steaming detected on 20 June (updated 28 Jun 2012)
Sirung (Pantar Island, Indonesia ): steaming and elevated seismicity (updated 27 May 2012)
Slamet (Central Java): degassing, strong fumaroles (updated 9 Aug 2012)
Sotará (Colombia): weak seismic unrest (updated 31 Jan 2013)
Soufriere Hills (Montserrat, West Indies (UK)): seismic unrest, occasional light ash venting (updated 21 Mar 2013)
Taal (Luzon, Philippines): degassing, elevated seismic activity (updated 6 Apr 2013)
Tahalra Volcanic Field (Algeria): 2 km deep volcanic earthquake on 14 february (updated 17 Feb 2013)
Talang (Sumatra)
Tambora (Sumbawa): aucune activité ces derniers mois, l'alerte est revenue à la normale (updated 6 Apr 2013)
Tiatia (Kunashir Island): weak thermal anomaly (updated 6 Sep 2012)
Tjörnes Fracture Zone (North of Iceland): continuing earthquake swarm (updated 7 Apr 2013)
To-shima (Izu Islands): seismic swarm (updated 10 Mar 2013)
Tongariro (North Island, New Zealand): strong steaming from Te Maari craters, slightly elevated seismic activity (updated 19 Feb 2013)
Torfajökull (Iceland): earthquake swarm (updated 17 Feb 2013)
Tungurahua (Ecuador): steaming, small explosions and weak ash venting (updated 6 Apr 2013)

Previous news
The Caliente lava dome of Santiaguito this morning
Saturday, Apr 06, 2013
It seems we have had a relatively calm day (for the volcano world) so far: ... [more]

Friday, Apr 05, 2013
Etna (Sicily, Italy): Today is a very sad day for all free people who like Etna: Etna has become a "forbidden volcano". ... [more]
Current seismic signal from Stromboli (ST8 station, INGV)
Thursday, Apr 04, 2013
Stromboli (Eolian Islands, Italy): Seismic activity remains elevated and accompanies strong explosions, mainly from the NE vent. ... [more]
Lava fountain from Etna's New SE crater during the 9th paroxysm (RadioStudio7 webcam)
Wednesday, Apr 03, 2013
Etna (Sicily, Italy): The 9th paroxysmal eruption from Etna's New SE crater in 2013 has occurring this afternoon and is currently at its peak phase it seems. ... [more]
Current seismic signal from Stromboli (ST8 station, INGV)
Tuesday, Apr 02, 2013
Stromboli (Eolian Islands, Italy): Tremor and explosion signals have further increased today, but no significant new lava overflows have occurred. ... [more]

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