جريمسڤوتن
بحيرات جريمسڤوتن الجليدية الفرعية Grímsvötn، (قالب:IPA-is; vötn = "waters", singular: vatn) وبركان يحمل نفس الاسم في جنوب شرق أيسلندا. وتوجد في مرتفعات أيسلندا في الجانب الشمالي الغربي من غطاء إيافيالايوكل الجليدي. تقع البحيرات على 64°25′N 17°20′W، وترتفع 1725 متر.
ثوران 2011
On 21 May 2011 at 19:25 UTC, an eruption began, with 12 كم (7 ميل) high plumes accompanied by multiple earthquakes. The ash cloud from the eruption rose to 20 كم (12 ميل), and is so far 10 times larger than the 2004 eruption, and the strongest in Grímsvötn for 100 years.
During 22 May the ash plume fell to around 10 km altitude, rising occasionally to 15 km.
On 23 May, the eruption was releasing about 2000 tons of ash per second, totalling 120 million tons in the first 48 hours. The 2011 eruption of Grímsvötn thus qualified as 4 (VEI4) on the Volcanic Explosivity Index (VEI), releasing more ash in the first 48 hours than Eyjafjallajökull released during its entire 2010 eruption.
On 24 May poor weather prevented visual observation of the eruption plume, but it had an estimated height of below 5 km, implying that the eruption is significantly weaker than on previous days.
المراجع
الموسوعه العلمية
التصانيف
ابحاث