Volcanic activity worldwide 18 Sep 2013: Arenal, Mauna Loa, Dukono, Batu Tara
Wed, 18 Sep 2013, 17:03 17:03 PM |
Recent earthquakes under Mauna Loa volcano
This could be merely an effect of better visibility due to currently better weather with less cloud cover, or indicate an increase of activity.
This morning, an ash plume was seen extending 25 nautical miles to the NE, at an estimated altitude of 7,000 ft (2.1 km).
Dukono (Halmahera): An explosion yesterday produced an ash plume rising to about 10,000 ft (3 km) altitude and drifting 25 nautical miles to the NE. (VAAC Darwin)
Mauna Loa (Big Island, Hawai'i): A small earthquake swarm occurred last week under the volcano. During 5-7 September, HVO detected about 350 small earthquakes up to magnitude 2.4 in a tightly clustered area at about 7 km depth west of the summit caldera. Only about 25 were strong enough to be located (map).
The swarm was in the same region where earthquakes began to occur a year or more before Mauna Loa's 1975 and 1984 eruptions. A likely interpretation is that the most recent swarm is a sign that some magma has intruded at the base of the volcano.
It is certainly no sign of an impending eruption in the very near future, but suggests that Mauna Loa, which still is the world's largest ACTIVE volcano, on the medium term, continues to prepare itself for its next eruption.
Arenal (Costa Rica): OVSICORI mentioned that rockfalls with rumbling noises have increased at the volcano over the past weeks. This could suggest that the volcano has started to wake up from its 3 years of slumber.
Volcano Activity Summary for 18 Sep 2013:
Currently erupting:
Ambrym (Vanuatu): active lava lakes in several craters (updated 16 Sep 2013)Bagana (Bougainville Island, Papua New Guinea): ash explosions (updated 16 Sep 2013)
Batu Tara (Sunda Islands, Indonesia): strombolian explosions, ash plumes up to 500 m, extrusion of a small lava dome with rockfalls (updated 18 Sep 2013)
Chirinkotan (Northern Kuriles): unspecified activity - possibly lava flows (updated 2 Sep 2013)
Cleveland (Aleutian Islands, Alaska): continuous small eruptions (updated 6 May 2013)
Colima (Western Mexico): lava flow on upper eastern flank (updated 19 Jul 2013)
Dukono (Halmahera): thermal anomaly, probably small explosive activity in summit crater (updated 18 Sep 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): frequent moderate to strong strombolian to vulcanian explosions (updated 16 Sep 2013)
Gamalama (Halmahera): ash eruptions since 17 Sep (updated 17 Sep 2012)
Grozny (Iturup Island): fumarolic activity (updated 3 Apr 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 13 Aug 2013)
Kizimen (Kamchatka): growing lava dome and incandescent rock avalanches (updated 6 Sep 2013)
Klyuchevskoy (Kamchatka): strombolian activity at summit crater (updated 14 Sep 2013)
Lokon-Empung (North Sulawesi, Indonesia): small explosions, lava flow? (updated 12 Sep 2013)
Marapi (Western Sumatra, Indonesia): occasional weak explosions (updated 14 Aug 2013)
Nyiragongo (DRCongo): active lava lake in summit crater (updated 12 Jun 2013)
Ol Doinyo Lengai (Tanzania): effusion of natrocarbonatite lava inside the crater (updated 8 Jul 2013)
Pacaya (Guatemala): strombolian activity and lava flow (updated 16 Sep 2013)
Paluweh (off Flores Island, Indonesia): active growing lava dome (updated 12 Aug 2013)
Rabaul (Tavurvur) (New Britain, Papua New Guinea): explosions and ash emissions (updated 12 Sep 2013)
Reventador (Ecuador): ash explosions, occasional pyroclastic flows (updated 16 Sep 2013)
Sakurajima (Kyushu, Japan): constant ash emissions and strong explosions (updated 13 Sep 2013)
Santa María / Santiaguito (Guatemala): Santiaguito volcano (Guatemala): lava flow on south flank of dome becomes more active (updated 16 Sep 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 12 Sep 2013)
Sinabung (Sumatra, Indonesia)
Stromboli (Eolian Islands, Italy): continuing lava overflows (updated 25 Jul 2013)
Suwanose-jima (Ryukyu Islands): Mt Ontake volcano of Suwanose-jima Island, Japan (updated 12 Sep 2013)
Tinakula (Santa Cruz Islands, Solomon Islands): increased activity at the volcano (updated 8 Feb 2013)
Yasur (Tanna Island, Vanuatu): strong strombolian activity (level 3), crater currently closed (updated 10 Sep 2013)
Eruption warning / minor activity:
Bezymianny (Central Kamchatka Depression): slow lava flow extrusion from dome (updated 6 Sep 2013)Copahue (Chile/Argentina): degassing, weak sporadic ash emissions (updated 16 Aug 2013)
Dieng (Central Java): increased degassing (updated 28 Mar 2013)
Etna (Sicily, Italy): sporadic ash emissions from New SE crater (updated 17 Sep 2013)
Galeras (Colombia): sporadic ash emissions (updated 25 Jul 2013)
Gamkonora (Halmahera): seismic swam, minor ash emissions (updated 27 May 2013)
Heard (Australia, Southern Indian Ocean): likely lava lake in summit crater (updated 10 Sep 2013)
Ibu (Halmahera, Indonesia): growing lava dome, seismic unrest (updated 9 Jun 2013)
Iliwerung (Lesser Sunda Islands): possible submarine eruption from Mt Hobal on 20 August (updated 20 Aug 2013)
Iwo-Tori-shima (Ryukyu Islands): possible small ash eruption on 6 July 2013 (updated 6 Jul 2013)
Karangetang (Siau Island, Sangihe Islands, Indonesia): lava extrusion at summit crater, strombolian activity, glowing avalanches (updated 4 Sep 2013)
Karymsky (Kamchatka): occasional small explosions, thermal anomaly (updated 6 Sep 2013)
Kerinci (Sumatra): occasional ash explosions (updated 5 Jun 2013)
Ketoi (Kurile Islands, Russia)
Kikai (Ryukyu Islands): steaming at summit crater of Iodake, occasional weak glows (updated 5 Jun 2013)
Kirishima (Kyushu): degassing, slightly increased seismic activity (updated 30 Jul 2012)
Krakatau (Sunda Strait, Indonesia): occasional explosions (updated 27 Jun 2013)
Langila (New Britain, Papua New Guinea): occasional ash explosions (updated 11 Feb 2013)
Manam (Papua New Guinea): occasional explosions (updated 12 Sep 2013)
Medvezhia (Kurile Islands, Russia): strong steaming, thermal anomaly (updated 17 Jan 2013)
Merapi (Central Java): moderate gas and ash plume on 22 july (updated 24 Jul 2013)
Nevado del Ruiz (Colombia): seismic unrest (updated 14 Sep 2013)
Nyamuragira (DRCongo): steaming/degassing from pit inside summit caldera (updated 18 Jul 2013)
Papandayan (West Java): strong hydrothermal activity, increased seismicity (updated 6 May 2013)
Poas (Costa Rica): occasional small phreatic explosions from lake (updated 22 Aug 2013)
Popocatépetl (Central Mexico): steam/gas/ash emissions (updated 14 Sep 2013)
Rasshua (Central Kuriles)
Raung (East Java): strombolian activity in summit crater (updated 5 Aug 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 24 May 2013)
Tolbachik (Kamchatka): effusion of fluid lava flows (updated 6 Sep 2013)
Tungurahua (Ecuador): degassing, earthquake swarm and inflation (updated 14 Sep 2013)
Turrialba (Costa Rica): ash venting, strong degassing (updated 24 Jul 2013)
Ubinas (Peru): occasional phreatic explosions (updated 6 Sep 2013)
Ulawun (New Britain, Papua New Guinea): steaming, degassing (updated 12 Sep 2013)
Veniaminof (Alaska Peninsula, USA): effusion of lava flows (updated 16 Sep 2013)
White Island (New Zealand): strong degassing, volcanic tremor (updated 20 Aug 2013)
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