1.   The Greek tremor occurred on what geologists call a normal fault, where the movement is primarily vertical.

2.   Writing in Science, the researchers suggest that the tremors occur as the subducting slab of rock dries out.

3.   Jacobz said the mild tremors occurred near an area where workers were digging a tunnel.

4.   The tremor occurred in Taghestan, north of the town of Boushehr.

5.   Low-frequency quakes have not been detected on Wednesday, but the agency will continue monitoring whether further tremors occur, officials said.

6.   Several earth tremors have also occurred in recent days as a result of the volcanic activity.

7.   Several tremors have occurred in different parts of the country in recent days without causing casualties or any major damage.