A strong 7.0 earthquake hit southern Japan early Saturday, the US Geological Survey said, a day after another powerful tremor killed at least nine people in the same area.
Tens of thousands have fled their homes in Japan as heavy rains flood parts of the country.
Tropical Storm Etau prompted emergency warnings in Japan and calls for 200,000 to evacuate, as the storm caused a river to overflow a levee.
Cypress and cedar trees in Japan are causing massive amounts of nitrogen runoff into local streams.
Right now, there are 28 mega-cities in the world, with about 450 million inhabitants among them. So, which world cities make the cut?
Climate change could affect the ratio of human males to human females that are born in some countries, a new study from Japan suggests.
See images shot by a hiker trapped on the top of Mount Ontake, the Japanese volcano that erupted on Sept. 27.
At least 31 hikers have been found lifeless near the peak of Mount Ontake after Saturday's volcanic eruption.
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