This is a catalog of instrumental locations for earthquakes in the New Madrid Seismic Zone and surrounding regions, 1974 to present. Because the network has evolved over the years, there is no guarantee of consistency in detection threshold, magnitude determination or region covered. The data in this catalog come from numerous sources:
- 1974-1992: TEIC earthquake bulletin and St Louis Regional Catalog
- 1993-1994: Saint Louis University and Central Mississippi Valley Earthquake Bulletins
- 1995-present: earthquakes reported by SLU and/or CERI
Output from the catalog search should have the following format:
| DATE | O.T. (UTC) | LAT | LONG | DEP | MAG | COMMENTS |
| 92/12/27 | 10:12:58.76 | 37.501 | -89.616 | 10 | 3.2 | TEIC catalog event |
| 93/ 1/ 3 | 21:14:54.14 | 35.194 | -90.244 | 17 | 2.7 | C WEST MEMPHIS, AR |
| 95/ 4/27 | 0:42:35.00 | 36.690 | -89.480 | 5 | 2.8 | C HENDERSON MOUND, MO |
| 95/ 5/27 | 19:51:10.00 | 36.170 | -89.430 | 6 | 3.0 | C MISTON, TN Felt |
DATE: Date of earthquake (YY/MM/DD)
O.T.: Origin Time of earthquake (UTC)
LAT: Latitude
LON: Longitude
DEP: Depth (km)
MAG: Magnitude
COMMENTS: Additional comments, including felt information or
independent magnitude determinations. Events from
1995 on include event quality (A=good, D=poor) and
only report origin times to the nearest second even
though accuracy may be known to a few tens of milliseconds.
Epicentral accuracy varies throughout the catalog but
in no case is better than a few tenths of a kilometer
(0.01 degrees latitude is about 1.11 km or 0.69 miles).