31.   When an earthquake actually occurs in the area, three levels of security precautions come into effect.

32.   Mild earthquakes have also occurred, but experts say there is no danger to the population.

33.   Researchers hope that picture will help them determine how earthquakes occur, and oy fluid, allowing for multiple, smaller quakes.

34.   The earthquake occurred under the ocean floor off the Kurils, an island chain disputed by Russia and Japan.

35.   The earthquakes also occurred in the early afternoon when most of the inhabitants of this mainly rural region were outdoors.