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continues with more than 100 quakes > M1.5 so far today. The quakes are concentrated underneath the El Julan coast, and some of the most recent quakes today have been at significantly shallower levels, 15-17 km, and indicate that magma now has started to rise.
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Seismic activity at Galeras volcano 28 June 2012
Tremor and small earthquakes continue to occur at Galeras volcano. Some of the seismic signals (such as the one early on 28 June) look like screw-shaped tornillos, which in the past have often preceded eruptions.
Thu, 28 Jun 2012, 10:05Mt Siple volcano in Antarctica might have become active and produced a steam plume recently detected on satellite imagery. The latest Smithsonian activity report mentions:
Wed, 27 Jun 2012, 18:26
Earthquakes are still at 20 km depth and continue at high rate (more than 150 >M1.5 today, mostly larger than M2). Accompanied by harmonic tremor, their location is migrating southwards into the Las Calmas Sea. In other words, magma continues to move southwards and the question is whether or not it will at some point start rising to the surface.
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SO2 plume from Popocatépetl (NOAA)
Small volcano-tectonic earthquakes, spasmodic and harmonic tremor, along with small gas and ash emissions, and occasional explosions continue.
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Seismic recording from Pacaya volcano (INSIVUMEH)
Pacaya volcano shows frequent quakes and tremor episodes, but there is only steaming as visible activity.
Wed, 27 Jun 2012, 09:19A moderate explosion occurred at 05:47 26 June producing a 600 m tall ash column drifting SE, and causing ash fall in the areas of Finca San José and Finca La Quina. Weak avalanches descended from the SE side of the dome and the lava flow front on its SW side. After 21:00 at night, a small lahar descended into the Nimá I river.
Wed, 27 Jun 2012, 09:16
Seismic activity recorded at Fuego volcano suggests another significant outburst occurred at that volcano late yesterday 27 June. INSIVUMEH reports 6 weak ash emissions and 3 strombolian explosions ejecting glowing bombs up to 150 m.
Wed, 27 Jun 2012, 09:13
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SO2 plume from Popo on 26 June
Gas and steam venting picked-up at Popocatepetl volcano in the past 24 hours. SO2 output from the volcano had increased the past few days.
Wed, 27 Jun 2012, 09:11
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Location and depth map of the quakes beneath El Hierro during the past 36 hours. The red bullets ion the Las Calmas sea only started in the June 26 afternoon.
The most interesting volcano-related event at the moment is certainly the
seismic crisis on El Hierro where the high-intensity earthquake swarm accompanied by tremor episodes continues. The quakes, still at "safe" 20 km depth, have now migrated to the El Julan coast where magma could be accumulating.
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Wed, 27 Jun 2012, 06:00IG reported that during 27 June-2 July visual observations of Tungurahua were limited due to cloud cover. An explosion on 27 June produced "cannon shot" sounds, along with an ash plume that rose 3 km above the crater and drifted W. Ashfall was reported in Manzano (8 km SW).
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Wed, 27 Jun 2012, 06:00
KVERT reported that during 22-29 June explosive activity at Shiveluch continued and seismic data indicated that possible ash plumes rose to an altitude of 9.5 km (31,100 ft) a.s.l. Observers indicated strong gas-and-steam activity on 22 June and noted ash plumes rising to an altitude of 5.3 km (17,400 ft) a.s.l. during 24-26 June.
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Wed, 27 Jun 2012, 06:00Based on seismic data and visual observations, INSIVUMEH reported that on 27 June a 16-m-wide, 90-cm-deep lahar traveled down Santa María's Rio Nima I drainage, carrying rocks up to 80 cm in diameter. During 28-29 June block avalanches again traveled down the SE flank and fumarolic plumes drifted SW. During 1-3 July explosions produced ash plumes that rose 700 m above the crater and drifted SW.
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Wed, 27 Jun 2012, 06:00
CENAPRED reported that during 27 June-3 July meteorological weather conditions often prevented observations of Popocatépetl. Gas-and-steam emissions were detected by the seismic network probably occasionally contained ash. Incandescence from the crater was intermittently observed at night and accompanied emissions during June 30-1 July.
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Wed, 27 Jun 2012, 06:00During 27 June-3 July HVO reported that the lava lake periodically rose and fell in the deep pit within Kilauea's Halema'uma'u Crater. Occasional measurements indicated that the gas plume from the vent continued to deposit variable amounts of ash and Pele's hair onto nearby areas. The lava pond in a small pit on the E edge of Pu'u 'O'o crater floor and two vents along the S edge of the floor were visible with the web cameras.
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Wed, 27 Jun 2012, 06:00
KVERT reported that moderate seismic activity from Karymsky continued to be detected during 22-29 June, and indicated that possible ash plumes rose to an altitude of 3.6 km (11,800 ft) a.s.l. Satellite imagery showed a weak thermal anomaly on the volcano on 22 June. The Aviation Color Code remained at Orange.
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Wed, 27 Jun 2012, 06:00Based on analyses of satellite imagery, the Darwin VAAC reported that during 28-29 June ash plumes from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 75 km NE and E.
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Wed, 27 Jun 2012, 06:00
AVO reported that cloudy conditions at Cleveland mostly prevented observations during 26-28 June. An area of possibly elevated surface temperatures was observed in images during 27-28 June. Cloud cover prevented observations during 29 June-3 July.
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Wed, 27 Jun 2012, 06:00Based on analyses of satellite imagery, the Darwin VAAC reported that on 27 June ash plumes from Batu Tara rose to an altitude of 1.8 km (6,000 ft) a.s.l. and drifted almost 30 km NW.
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Wed, 27 Jun 2012, 06:00
JMA reported that during 25-29 June large explosive eruptions from Sakura-jima's Showa Crater occurred ten times and ejected tephra as far as 1,300 m from the crater.
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Wed, 27 Jun 2012, 06:00AVO reported that a minor increase in seismicity at Spurr was detected at about 0500 on 25 June, lasted about 45 minutes, and was characterized by several discrete M1earthquakes. The signals recorded were consistent with seismic energy generated by an energetic flow of water, possibly indicating a glacial outburst flood on the lower S flank. The next day seismic levels had declined to near background and no additional flowage signals were observed.
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Wed, 27 Jun 2012, 06:00
According to INGEOMINAS, the Observatorio Vulcanológico and Sismológico de Manizales reported that a significant concentration of sulfur dioxide was detected rising from Nevado del Ruiz during 28-29 June. Seismic signals indicated continuing gas and ash emissions.
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Wed, 27 Jun 2012, 06:00RVO reported that four pyroclastic flows traveled down Manam's SE flank on 16 June. The following day activity was low; emissions were mostly steam with occasional ash. During 18-30 June gray ash clouds, that were sometimes black, rose 100-150 m above the crater and drifted mainly NW.
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Wed, 27 Jun 2012, 06:00
On the night of 24 June, a M 3.1 earthquake occurred offshore N of El Hierro island at a depth of 20 km. After that event, both the seismic activity and the deformation greatly increased. The seismicity, initially located N of the island in the El Golfo area, migrated S, then later to the W, along the E-W rift zone.
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Wed, 27 Jun 2012, 06:00INSIVUMEH reported that during 28-29 June activity at Fuego increased; explosions produced ash plumes that rose 500-600 m above the crater and drifted SW. Pulses of incandescence rose 200 m and tephra avalanches descended the Ceniza drainage (SSW). According to Coordinadora Nacional para la Reducción de Desastres (CONRED) on 1 July, seismicity increased and rumbling sounds were audible in areas up to 10 km away.
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Tue, 26 Jun 2012, 23:41
The volcanic tremor has subsided again, but earthquakes continue at about 20 km depth in the El Julan area. More than 200 quakes >M1.5 have occurred today.
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Tue, 26 Jun 2012, 17:27
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Reappearing volcanic tremor signal (IGN) at about 16h10 on 26 June
While the unusually strong earthquake swarm under El Hierro Island continues, harmonic volcanic tremor has reappeared short time ago at about 16h10 UTC.
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