| 1 | The Tunguska event included seismic waves and infrasonic disturbances that were recorded around the world. | |
| 2 | Results indicated most of the permanent ground displacements occurred within a few minutes of the arrival of the first seismic waves. | |
| 3 | Scientists assign a magnitude rating to earthquakes based on the strength and duration of their seismic waves. | |
| 4 | Scientists study the Earth and natural disasters through the science of seismology - how seismic waves move through the Earth - and seismometers are their most important tool. | |
| 5 | Zumberge said a conventional seismometer records how its mass is displaced by these waves of seismic energy with electric circuit boards. |
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