Spatter cone erupting basalt lava (1-2 April 2021) (Geldingadalur Valley, Iceland) 2 : 無料・フリー素材/写真
Spatter cone erupting basalt lava (1-2 April 2021) (Geldingadalur Valley, Iceland) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | (Web camera screen capture video clips taken from 1 April to 2 April 2021)----------------------------------------------------------On 19 March 2021, a basaltic lava flow eruption started in the Geldingadalur Valley, next to the Fagradalsfjall Volcano in southwestern Iceland's Reykjanes Peninsula. This followed a swarm of about 50,000 earthquakes that occurred during the previous month. The eruption reportedly started as a fissure eruption - lava was spewed from an extensive crack in the ground. This evolved into a short chain of spatter cones, one of which ended up being larger than the others (= main cone), with more energetic activity.Spatter cones are small to very small, steep-sided volcanic cones formed by the accumulation and solidification of blobs of lava that sputtered from a vent. They are usually basaltic in composition.The spatter cone seen here is just to the left of the main cone (see previous video in the photostream). Lava fountaining is more energetic from this cone, compared with the early days of the eruption.Iceland is a volcanic island in the North Atlantic Ocean between Britain and Greenland. It is situated on the Mid-Atlantic Ridge, along which the North American Plate and the Eurasian Plate separate and new oceanic crust forms. Seismicity in the area is due to subsurface magma movement from hotspot (mantle plume) activity, as well as seafloor spreading (= tectonic divergence). Magma reaching the surface results in volcanic eruptions. Some famous eruptions in Iceland include Laki (1783), Surtsey (1963-1967), Eldfell (1973), Hekla (1991, 2000), Eyjafjallajökull (2010), and Grimsvötn (2011). |
| 撮影日 | 2021-04-02 11:37:17 |
| 撮影者 | James St. John |
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