1.   Many of these vibrations are caused by volcanoes, of which Japan has more than its share.

2.   Volcanoes can also cause tsunamis.

3.   Boats are also not sailing for fear the volcano could cause a tidal wave.

4.   Boatmen have been refusing to sail, saying they fear the volcano could cause a tidal wave.

5.   By early Thursday, the volcano had caused extensive damage to recently harvested sugar, wheat, corn and other crops.

6.   It was the first time the volcano had caused injuries.

7.   The volcano could cause showers of ash hundreds of miles away, it said.

8.   The volcano has caused widespread disruption to air traffic.