| Date | Time (UT) | Latitude | Longitude | Depth (km) | Magnitude | Quadrangle | Felt | Map | Mechanism |
| 99/03/18 | 08:46:00 | 36.54N | 89.60W | 5.0 | 2.3 | NEW MADRID, MO | N | 990318 Map | |
| 99/04/15 | 17:35:56 | 37.47N | 89.25W | 5.0 | 2.4 | JONESBORO, IL | N | 990415 Map | |
| 99/05/14 | 14:18:22 | 39.10N | 94.70W | 5.0 | 3.0 | MISSOURI-KANSAS BORDER | Y | 990513 Map | |
| 99/05/27 | 06:00:03 | 36.73N | 89.47W | 0.9 | 2.3 | HENDERSON MND., MO | N | 990527 Map | |
| 99/06/08 | 14:21:02 | 38.12N | 90.69W | 10.9 | 2.3 | FLETCHER, MO | N | 990608 Map | |
| 99/06/22 | 07:05:34 | 36.85N | 89.47W | 5.0 | 2.2 | EAST PRAIRIE, MO | N | 990622 Map | |
| 99/07/06 | 09:29:00 | 37.08N | 88.77W | 8.0 | 2.2 | HEATH, KY | N | 990706 Map | |
| 99/07/11 | 13:03:20 | 37.92N | 90.73W | 7.8 | 2.3 | MINERAL POINT, MO | N | 990711 Map | |
| 99/07/13 | 12:58:19 | 37.91N | 90.73W | 12.2 | 2.5 | MINERAL POINT, MO | N | 990713 Map | |
| 99/07/13 | 12:58:51 | 37.93N | 90.73W | 2.0 | 2.2 | MINERAL POINT, MO | N | 990713 Map | |
| 99/07/25 | 23:24:54 | 38.15N | 89.82W | 16.1 | 2.6 | BALDWIN, IL | N | 990725 Map | |
| 99/08/01 | 10:42:26 | 36.53N | 89.54W | 5.3 | 2.3 | NEW MADRID, MO | N | 990801 Map | |
| 99/08/19 | 01:30:45 | 36.16N | 89.49W | 21.5 | 2.2 | MISTON, TN | N | 990819 Map | |
| 99/08/23 | 12:12:41 | 36.26N | 89.52W | 5.0 | 3.3 | MOORING, TN | Y | 990823 Map | |
| 99/09/02 | 16:17:30 | 41.70N | 89.40W | 5.0 | 3.5 | S-SE OF DIXON, IL | Y | 990902 Map | |
| 99/09/13 | 03:15:18 | 36.50N | 89.45W | 5.0 | 1.9 | HUBBARD LAKE, MO | N | 990913 Map | |
| 99/09/15 | 01:07:33 | 36.56N | 89.48W | 5.0 | 2.5 | HUBBARD LAKE, MO | N | 990915 Map | |
| 99/10/20 | 09:00:03 | 34.76N | 91.22W | 5.0 | 2.5 | KEEVIL, AR | N | 991020 Map | |
| 99/10/21 | 08:18:00 | 36.46N | 90.95W | 5.0 | 3.9 | MAYNARD, AR | Y | 991021 Map | |
| 99/10/21 | 08:49:49 | 36.47N | 90.99W | 5.0 | 3.2 | MAYNARD, AR | N | 991021 Map | |
| 99/11/11 | 15:05:23 | 36.82N | 89.54W | 5.0 | 2.5 | SIKESTON SOUTH, MO | N | 991111 Map | |
| 99/11/26 | 06:54:58 | 36.51N | 92.72W | 10.9 | 2.8 | THEODOSIA, MO | Y | 991126 Map | |
| 99/11/28 | 08:33:02 | 36.58N | 89.79W | 11.5 | 2.4 | PARMA, MO | N | 991128 Map | |
| 99/12/09 | 00:57:02 | 36.58N | 89.60W | 5.0 | 2.4 | NEW MADRID, MO | N | 991209 Map | |
| 99/12/23 | 08:22:26 | 36.55N | 89.67W | 5.2 | 2.5 | CATRON, MO | N | 991223 Map |