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Archive for the ‘tephra’ Category

Eyjafjöll Still Erupting

Posted by feww on March 31, 2010

Eyjafjöll Volcano on Fimmvörduháls Continues Erupting

As volcanic activity at the Fimmvörduháls in south Iceland waxes and wanes, an expert said up to 20 million cubic meters of pyroclasts may have been ejected from the fissure.

Local geophysicist Magnús Tumi Gudmundsson said the volcano may have spewed an estimated, 15-20 million cubic meters of tephra since the eruption began on March 21.  The lava now covers an area of about one square kilometer, he told a local newspaper.


Tephra fountain seen at Fimmvörduháls. Source . Image may be subject to copyright. Click image to enlarge.


Lava Fall created by eruption at Iceland’s Fimmvörduháls  Source. Image may be subject to copyright.
Click image to enlarge.


Increased Volcanic Activity in Iceland
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Posted in Fimmvörduháls, Iceland volcano, pyroclasts, tephra, Tephra fountain | Tagged: , , , , , , , , , | 4 Comments »

Tonga’s Metis Shoal may be erupting

Posted by feww on February 3, 2009

Metis Shoal Submarine Volcano May Be Erupting

1. FEWW seismic analysis of Tonga Islands region in south Pacific Ocean (SPO) indicate that Metis Shoal, a submarine volcano located midway between the islands of Kao and Late (about 50 km NNE of Kao), may be about to erupt, or is currently undergoing a period of unrest.

2. Metis Shoal’s last known eruption occurred in 1995, which produced an island with a diameter of about 300 m and a height of 43 m after a solid lava dome was formed above the surface of water in SPO.

3. Since 1851 some 8 episodes of unrest have been recorded. In three, possibly five, of those occasions new islands were created (1858, 1967-68, 1979, 1995).

Metis Shoal

  • Country:  Tonga
  • Region:  Tonga Islands, SPO
  • Volcano Type:  Submarine volcano
  • Last Known Eruption:  1995
  • Summit Elevation:  43 m asl
  • Latitude: 19.18°S   19°11’0″S
  • Longitude:  174.87°W   174°52’0″W

4. Metis Shoal, a submarine volcano midway between the islands of Kao and Late, has produced a series of ephemeral islands since the first confirmed activity in the mid-19th century. An island, perhaps not in eruption, was reported in 1781 and subsequently was eroded away. During periods of inactivity following 20th-century eruptions, waves have been observed to break on rocky reefs or sandy banks with depths of 10 m or less. Dacitic tuff cones formed during the first 20th-century eruptions in 1967 and 1979 were soon eroded beneath the sea surface. An eruption in 1995 produced an island with a diameter of 280 m and a height of 43 m following growth of a lava dome above the surface. [Caption: GVP]


5. Waves break over Metis Shoal on February 19, 1968, more than a month after the end of a submarine eruption that began in December 1967 and produced an ephemeral island. Metis Shoal has produced a series of small islands during eruptions observed since the mid-19th century. Most recently, an eruption in 1995 produced a lava dome that built up to 43 m above sea level. Photo by Charles Lundquist, 1968 (Smithsonian Astrophysical Observatory). Caption: GVP


6. Map of the Tonga Islands, showing the island groups and location of Metis Shoal, which re-emerged as an island in June 1995. Source: GVP

Other Photos of Metis Shoal


7. Metis Shoal, sea level view. Source: MTU


8. Metis shoal, aerial view. Source: MTU


9. Metis Shoal aerial photo dated December 7,  2006. Source: GVP

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Posted in fumarolic activity, Submarine eruption, tephra, volcanic unrest, volcanoes | Tagged: , , , , | 7 Comments »