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Volcanic activity worldwide 25 May 2013: Stromboli, Santa María / Santiaguito, Pacaya, Fuego, Popoc...

sábado may 25, 2013 16:54 |

Explosion from the NE vent of Stromboli on the INGV webcam
Explosion from the NE vent of Stromboli on the INGV webcam
Map of recent earthquakes under Etna
Map of recent earthquakes under Etna
MODIS hot spot data (past 7 days) for Paluweh volcano (ModVolc, Univ. Hawaii)
MODIS hot spot data (past 7 days) for Paluweh volcano (ModVolc, Univ. Hawaii)
Location of recent earthquakesSE of Lassen volcano (USGS data)
Location of recent earthquakesSE of Lassen volcano (USGS data)
SO2 plume from Popocatépetl (NOAA)
SO2 plume from Popocatépetl (NOAA)
This morning's seismic recording at Pacaya (PCG station, INSIVUMEH)
This morning's seismic recording at Pacaya (PCG station, INSIVUMEH)
Seismic recording this morning at Nevado del Ruiz (OLL station, INGEOMINAS)
Seismic recording this morning at Nevado del Ruiz (OLL station, INGEOMINAS)
Steam-ash plume from Copahue on 24 May (SERNAGEOMIN webcam)
Steam-ash plume from Copahue on 24 May (SERNAGEOMIN webcam)
Stromboli (Eolian Islands, Italy): Activity continues at moderately elevated levels. Spectacular explosions especially from the NE crater can often be seen on the webcam as well.

Etna (Sicily, Italy): The earthquake swarm on the SE flank seems already to have come to an end. No eruptive activity is currently occurring at the summit craters. Strong wind and cloud cover prevented a field visit today.
...24 May:
A swarm of shallow (3-6 km depth) earthquakes including several felt ones (magnitudes 2.9-3.5) occurred yesterday and today under the SE flank near Zafferana town. So far, no other unusual signs of activity have been reported, but the swarm could indicate something in the making, and the monitoring agency INGV is certainly following these events closely.

Bagana (Bougainville Island, Papua New Guinea): An explosion produced an ash plume rising to 7,000 ft (2.1 km) altitude and drifting 20 nautical miles to the NW earlier today. (VAAC Darwin)

Paluweh (off Flores Island, Indonesia): (24 May) Ash plumes rising to 10,000 ft (3 km) altitude have been observed yesterday and today. The lava dome obviously continues to be active and regularly produces explosions and/or rock avalanches that cause ash plumes.

Lassen (California): (24 May) A shallow magnitude 5.7 earthquake occurred Fri, 24 May at 04:58 UTC km WNW of Greenville, California, about 50 km SE of Lassen volcano. Hundreds of aftershocks, some of them felt, have occurred. It is unlikely that the earthquake has any relation with the volcano. The status of Lassen volcano remains therefore at green.

Popocatépetl (Central Mexico): Activity has not changed much, but perhaps decreased a bit today. During the last 24 h, CENAPRED recorded 3 explosions of moderate intensity, yesterday at 15:40 h, this early morning at 06:46 h and at 10:00 h (local time). All of them were accompanied by a column of gas and ash of 1.5, 1 and 2 km height, respectively.
Several episodes of tremor were registered as well: 3 h of harmonic tremor of low amplitude, 5 h 40 min of spasmodic tremor of low amplitude and 2 h 30 min of spasmodic tremor or medium amplitude. This seismic signal was accompanied by a constant emission of steam, gas and small amounts of ash, that reached between 500 to 900 m and travelled to the southwest, and by moderate to strong incandescence over the crater rim. Some incandescent fragments could be sporadically be observed falling on the highest parts of the north and northeast flanks.
... [read more]

Santa María / Santiaguito (Guatemala): Activity remains low. A moderate explosion occurred last night at 17:55 h (local time) erupting an ash plume rising 600 m and drifting SW and causing light ash fall in Finca La Florida and Parcelamiento Monte Claro. Otherwise, the dome is degassing and a few weak avalanches occurred from the lava flow on the southern flank of the dome.

Pacaya (Guatemala): Strombolian activity from the Mackenney is gradually intensifying and continues to fill the crater. Explosions reach 75 m height above the vents and some of the ejecta fall outside the crater and produce audible booms. This activity and volcanic tremor is visible on the seismic recording as well.

Fuego (Guatemala): Explosive activity has picked up a bit. INSIVUMEH reported strong degassing noises and 5 weak and 4 moderate explosions since yesterday, some of which produce plumes of about 1 km height and drifting 10 km to the W and NW. Light ash fall occurred in the areas of Panimache 1 and 2, Morelia, Santa Sofía, El porvenir and Yucales.

Nevado del Ruiz (Colombia): The volcano remains restless and shows significant degassing activity. Elevated SO2 emission visible on the latest NOAA satellite data is probably the result of the recent magma intrusions. Seismic recordings show internal fluid movements, degassing tremor and occasional small quakes.

Sangay (Ecuador): (24 May) A possible ash emission occurred yesterday at 17:15 GMT, VAAC Washington reported. A pilot observed an ash plume at 25,000 ft (7.5 km) altitude drifting west from the volcano, but no ash could be detected on satellite data.

Reventador (Ecuador): No significant changes have occurred recently. The volcano remains active at moderate levels and produces a steam plume 800-1000 m high and occasional small explosions.

Tungurahua (Ecuador): Activity continues to be very low (steaming / degassing).

Copahue (Chile/Argentina): A steam and ash plume is rising about 1-1.5 km from the crater where it is emitted by 3 vents. Two of these emit only gas and steam. The third one erupts some ash as well, Chilean scientists found out during an helicopter overflight.
It seems that (for now) this activity is phreatic, i.e. involves no fresh magma, only overheated water from the hydrothermal system, that can fragment rock into ash during explosive decompression. Temperature measurements gave a value of only 200°C at the vents.
Noticias Anteriores
The plume of Chirinkotan volcano this morning (NASA/MODIS via Blog Culture Volcan)
viernes, may 24, 2013
Chirinkotan (Northern Kuriles): The remote volcano in the northern Kuriles is probably in eruption, the latest SVERT report and satellite images suggest. A plume of gas and steam, and possibly some minor amounts ash was seen with the MODIS sensor onboard the NASA Terra satellite this morning. ... [Leer más]
Seismic trace of the 3.5 earthquake today (ESVO station, INGV Catania)
jueves, may 23, 2013
Etna (Sicily, Italy): A shallow magnitude 3.5 earthquake occurred under the town of Zafferana, about 10 km east of the summit area this afternoon. ... [Leer más]
Strombolian eruption from the NE vent (21 May 2013)
jueves, may 23, 2013
Stromboli (Eolian Islands, Italy): Explosive activity at Stromboli is currently at normal to moderately high levels, but the magma column has obviously dropped considerably compared to previous weeks, as there are no longer lava overflows. We observed the volcano during the past days and found a total of 8 active vents in the crater terrace, out of which 4 were showing their typical different strombolian activity: ... [Leer más]
Ash emissions from Turrialba volcano (OVSICORI webcam)
miércoles, may 22, 2013
Turrialba (Costa Rica): New ash emissions occurred yesterday and produced light ash falls in the outskirts of San José, in the areas of Guadalupe, Tres Ríos, Curridabat, and Ipis (at about 30 km distance). ... [Leer más]
Glow from Popocatépetl's summit (CENAPRED webcam)
martes, may 21, 2013
Sangeang Api (Indonesia): An increase in seismicity since 26 April triggered VSI to rise the alert status from 2 to 3 on a scale of 1-4 (from "Waspada", "watch" to Siaga", alert). For the moment, only degassing has been observed as surface activity. ... [Leer más]

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