21.   Seismic activity of a lower magnitude has been rocking the region ever since.

22.   Schlumberger will benefit from stronger marine seismic activity in foreign markets and higher use and dayrates for semi-submersible rigs on deepwater projects, Carroll wrote.

23.   Seismic activity increased, too.

24.   The central and southern parts of New Hampshire see the most seismic activity, he said.

25.   The gold-filled cracks and crannies of the Mother Lode also have their origins in such seismic activity.

26.   The government said just a few days ago that it planned to upgrade geological surveillance because of the increase in seismic activity.

27.   The mission, which includes a NASA-supplied soil analyzer, will measure seismic activities and weather readings, as well as obtaining surface photographs.

28.   The proposed repository is vulnerable to seismic activity.

29.   The researchers fear that recent changes in seismic activity may herald the next big one.

30.   The system provided a continuous, real-time history of seismic activity.