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Nigerian authorities and France's Areva group have sent experts to investigate eruptions, smoke and fumes spouting from a mountain in the West African nation's northern uranium mining district of Arlit, state media said. Earlier this week, residents reported two days of activity. Experts dispatched to take samples found cracks in the mountainside and rocks 400 metres away. There were no reports of injuries or damage to mines. "According to the witnesses who alerted the authorities, when they heard explosions, they initially thought it was an earthquake or a volcanic eruption," state radio said in a report.
Tambora volcano in Indonesia has been raised to level 2 alert (out of maximum 4) after an increase in volcanic earthquakes. In April 2011 there were 37 shallow volcanic earthquakes recorded, 167 in May, 277 in June, 363 in July, and 141 from 1-29 August. Continuous tremor was recorded on 29 and 30 August.
Tambora erupted in 1815 killing 92 000 people making 1816 the year without a summer as the global climate effects were felt. Aerosols from the Tambora eruption blocked out sunlight and reduced global temperatures by 3 deg C. Europe missed a summer, and India had crop failures following the Tambora eruption. 100 cubic km of magma was erupted. Ten thousand people were killed immediately from the pyroclastic flows and the eventual toll due to starvation and disease may have been as high as 117,000. The eruption caused a tsunami with a wave height of 10 m.
The Popocatepetl (po-po-ka-TEH-peh-tel) volcano south of Mexico City is shooting blasts of ash from its crater.
Mexico’s national disaster prevention agency says the volcano has spewed ash more than a half mile (a kilometer) into the sky four times Tuesday. It says there is a possibility ash could fall onto Mexico City overnight.