An eruption was observed Wednesday at Mt. Aso in southwestern Japan, but 16 climbers on the volcano at the time walked away uninjured, authorities said Tuesday.The eruption occurred at 11:43 a.m. at the No. 1 Nakadake crater, according to the Japan Meteorological Agency. Mt. Aso's volcanic alert level was raised to 3 on a scale of 5, with entry restricted to areas within 2 kilometers of the crater.Volcanic ash blew more than 1 kilometer from the crater and reached a height of about 3,500 meters, while a pyroclastic flow was confirmed within 1.3 km west of the crater for the first time since…READ FULL ARTICLE