5 February 2016, 13:41 GMT
TOKYO (Sputnik) – Experts observed an increase in volcanic earthquakes in the Kirishima mountain range on Kyushu island, urging tourists and hikers to avoid the 0.6-mile area around Mt. Io’s crater.
The agency said at least 37 volcanic tremors have been recorded at the site by mid-Sunday.
Intensified activity around the 4,300-foot volcano dates back to July 2015.
