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In late May, 2009, activity decreased and the Alaska Volcano Observatory lowered the alert level. A nearly six-month period of relative quiet at the volcano ended on December 27, 2009, with renewed earthquake swarms. The AVO subsequently raised the alert level, and again warned of the possibility of a more vigorous eruption due to dome collapse ...
The Biu Plateau is a highland area in Northeastern Nigeria containing many recently extinct volcanoes. It covers about 5,200 km 2 (2,000 sq mi) and has an average elevation of 700 m (2,300 ft). [1] The plateau lies between the Upper Benue Basin to the south and the Chad Basin to the north.
La Garita Caldera erupts in the Wheeler Geologic Area, Central Colorado volcanic field, Colorado, USA, eruption several VEI 8 events (Possibly as high as a VEI 9), 5,000 cubic kilometers (1,200 cu mi) of Fish Canyon Tuff was blasted out in a single, major eruption about 27.8 million years ago. [52] [86] [87]
A.D. 79: Mount Vesuvius, Italy. Mount Vesuvius has erupted eight times in the last 17,000 years, most recently in 1944, but the big one was in A.D. 17. One of the most violent eruptions in history ...
In a volcanic eruption, lava, volcanic bombs, ash, and various gases are expelled from a volcanic vent and fissure. While many eruptions only pose dangers to the immediately surrounding area, Earth 's largest eruptions can have a major regional or even global impact, with some affecting the climate and contributing to mass extinctions .
1883 eruption of Krakatoa: 30,000 Mount Pelée: 4 Martinique: 1902 1902 eruption of Mount Pelée: 23,000 Nevado del Ruiz: 3 Colombia: 1985 Armero tragedy: 20,000~ (estimated) Santorini: 6 Greece: c. 1600 BC Minoan eruption: 15,000 to 20,000 Mount Samalas: 7 Indonesia: 1257 1257 Samalas eruption: 15,000 Mount Unzen: 2 Japan: 1792 1792 Unzen ...
eruption episode L 7 Phlegraean Fields: Campanian volcanic arc: Unknown 15.7 5 Mount Vesuvius Campanian volcanic arc 1.3 19.3 Green Pumice: 7 Long Island, PNG Bismarck Volcanic Arc 100 19.3 Kiau Ignimbrite 7 Zavaritzki Caldera: Simushir, Kuril Islands: 200 20 6 Rabaul: Bismarck Volcanic Arc >10 21 Kulau Ignimbrite 6 Menengai
January – Start of an meningitis outbreak in four West African countries, including Nigeria. [2] 5 May – Olusegun Oni, the incumbent Governors of Ekiti State, was announced to have won the gubernatorial by-election. 26 to 29 July – Boko Haram, an Islamic extremist group, launched an uprising in Bauchi State and expanded across northern ...