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Volcanic activity world-wide 25 August 2012: Tankubanperahu, Grozny, Karymski, Ambrym & Yasur, El Hierro, Popocatépetl, Fuego, Santiaguito, Nevado del Ruiz, Batu Tara, Sakurajima

Saturday Aug 25, 2012 16:43 PM | BY: T

The alert level of Tangkubanperahu volcano in West Java, Indonesia, was raised to 2 (on a scale 1-4) on 23 August. An increase of earthquakes has been observed at the volcano since 13 August.

Our expedition leader and geologist Yashmin posted an update and photos on the volcanoes Ambrym and Yasur, both of which were quite active (lava lakes in Marum and Benbow, strombolian activity at Yasur) during our latest Vanuatu expedition.

The number of earthquakes at El Hierro is on the rise again. Yesterday, there were 11, today so far there have been 7 quakes. They were all very small, mostly at 10 km depth, in the western part of the island under near the El Golfo coast and some beneath the western El Julan area. There is no tremor signal associated, but El Hierro remains a volcano to watch closely.

Popocatépetl has been calming down. Only one weak explosion per 2 hours on average were observed and there are no reports of ash emissions.

Santiaguito has weak to moderate explosions with ash clouds rising 700 m. There are 4 active blocky lava flows from the dome, 2 of which are filling a river valley and produce occasional hot lahars.

Fuego has mild strombolian explosions throwing lava up to 100 m above the crater. The Taniluyá lava flow is about 200 m long, INSIVUMEH reports.

Nevado del Ruiz volcano: Swarms of small earthquakes seem to be occurring at the volcano this morning. The volcano observatory reports constant tremor and steam with some ash emissions. An SO2 plume drifting west can be seen on the latest satellite images.

Tungurahua volcano: Activity has further calmed down over the past day. Only small explosions occurred and the maximum height of the steam and ash plume above the volcano has decreased to 2 km.
The seismic signal also shows a significant decrease of volcanic tremor.

Satellite observations:
Batu Tara (Sunda Islands, Indonesia) erupted again as well, this time, the ash cloud was measured to have reached only 1.8 km (6,000 ft).

Activity of Sakurajima volcano seems to be decreasing. Only one relatively small explosion (13:45 UTC today, ash to 1.8 km) was recorded by Tokyo VAAC during the past 2 days.

A possible new eruption of Grozny volcano (ETOROFU-YAKEYAMA in Japanese) on Iturup island has been reported by Tokyo VAAC who detected an ash plume rising to 13,000 ft (ca. 4.3 km) on 22:00 UTC yesterday and drifting east.

An explosion from Karymski (Kamchatka) was reported to have occurred at 02:07 UTC early today, producing an ash cloud reaching 19,000 ft (6 km) altitude. (VAAC Tokyo)
Previous news
Friday, Aug 24, 2012
Tungurahua volcano's activity remains at similar moderate levels as yesterday, lower than compared to a few days ago. Explosions every few hours are accompanied by strong cannon-shot noises and eject glowing bombs to up to 500 m height. Steam and ash plumes rise up to 4 km above the crater. Light ash fall was reported to the W and NW in the sectors of Chacauco, Cotaló and El Tablón. ... [more]
Thursday, Aug 23, 2012
Tungurahua volcano's activity has decreased. There are still occasional weak explosions, but bad weather prevents direct observation. ... [more]
Wednesday, Aug 22, 2012
Tungurahua volcano has been very active the past days, with continous ash emissions and occasional large explosions producing ash plumes up to 32,000 ft (ca. 10 km) altitude. IG scientists on an overflight observed strombolian activity from the inner summit crater which has filled with fresh lava. ... [more]
Tuesday, Aug 21, 2012
Tungurahua volcano emits a near constant steam and ash plume rising on average 1.5 km with peaks of up to 4 km above the crater. This activity produces significant ash fall in areas west of the volcano. Intermittent explosions throw bombs to 500 m height and up to 1.5 km radial distance. A strong SO2 plume can be seen on satellite imagery. ... [more]
Monday, Aug 20, 2012
The eruption of Tungurahua volcano continues with constant ash emission rising 1.5 km above the crater, intermittent moderate explosions, and produces pyroclastic flows of 1.5 km length. ... [more]

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