31.   They say the puzzling dual seismic waves are, in fact, a single wave that divided underground.

32.   They used many kinds of data to determine the model, including the speed at which seismic waves travel through different portions of the mantle.

33.   Years ago, rocks formed by volcanoes or superheated salt sheets scattered seismic waves, preventing accurate mapping of what lies below.

34.   A common technique for mapping the underground is to monitor seismic waves by setting off explosions or thumping the ground with a large sledgehammer.

35.   A tsunami is a seismic wave caused by undersea disturbances such as volcanic activity or earthquakes.

36.   An agency official said there were no fears of tsunami, or seismic waves caused by undersea disturbances such as volcanic activity or earthquakes.

37.   But he added there were no fears of tsunamis, seismic waves caused by undersea disturbances such as earthquakes or volcanic activity.

38.   Currently, most of the country is monitored by arrays of mechanical monitors that read a variety of seismic waves generated by earthquakes.

39.   He rushed back to find his mother, Elda, dead, crushed when a seismic wave flattened half of Armenia.

40.   It said there was no danger of tsunami, or seismic waves, from the quake.