| Date | Time (UT) | Latitude | Longitude | Depth (km) | Magnitude | State/Province | Felt | Mechanism | |
| 1998/01/02 | 07:28:29 | 38.18 | -112.46 | 10.0 | 4.5 | Utah | Y | 19980102072829 Mechanism | |
| 1998/01/15 | 23:34:39 | 38.50 | -90.43 | 15.7 | 2.4 | Missouri | Y | 19980115233439 Mechanism | |
| 1998/06/20 | 21:16:20 | 43.26 | -110.59 | 10 | 4.7 | Wyoming | ? | 19980620211620 Mechanism | |
| 1998/12/12 | 01:41:32 | 37.46 | -116.29 | 11 | 4.24 | Nevada | Y | 19981212014132 Mechanism | |
| 1998/12/22 | 01:17:46 | 48.0 | -115.2 | 10 | 4.5 | Montana | ? | 19981222011746 Mechanism | |
Note: "SW Study only" means that the earthquake was processed for the purpose of obtaining group velocities for tomographic studies. In the case of earthquakes in California, the definitive source parameters are obtained from the California Integrated Seismic Network.