NCEER Catalog
The NCEER-91 (National Center for Earthquake Engineering Research) Catalog for the Eastern United States, (Armbruster and Seeber, 1992) is one of the most carefully researched historical catalogs for the central and eastern U.S. and contains events from 1627 through the beginning of 1985.
If you requested a search on one of the nine magnitude types, the output will look something like this:
DATE O.T. (UTC) LAT LONG DEP MAG MT MMI FA MAIN EQID
1980/ 7/25 6:22:34.00 45.140 -74.170 5 3.1 1 0.0 * 6639
1980/ 7/27 18:52:21.40 38.190 -83.890 16 5.2 1 VII 12.0 MAIN 6642
1980/ 7/31 9:27: 2.30 38.190 -83.930 19 2.5 1 IV 0.0 6642 6650
DATE: Date of earthquake (YYYY/MM/DD)
O.T.: Origin Time of earthquake (UTC)
LAT: Latitude
LON: Longitude
DEP: Depth (km) [0 if undetermined]
MAG: Magnitude (of the type you selected)
MT: Magnitude Type: This refers only to NCEER magnitudes, and
denotes how the magnitude was determined:
1 = Instrumental, 2 = Felt Area, 3 = Maximum Intensity
MMI: Epicentral Intensity, MMI scale (rounded up
to nearest integer)
FA: Natural Log of Felt Area in km [0 = undetermined]
MAIN: "MAIN" if event is a main shock, "*" if event is isolated.
Otherwise, the EQID of the parent event is given.
EQID: Earthquake Identification Number
If FULL OUTPUT was specified, the search results are listed in the
original format:
COLUMN NUMBERS FORMAT TERM DESCRIPTION 3 7 I5 UNID Unique Identification for each entry 8 12 I5 EQID Earthquake Identification Number 13 16 I4 YEAR Year (origin time in UTC) 17 18 I2 MONTH Month 19 20 I2 DAY Day 21 22 I2 HOUR Hour 23 24 I2 MIN Minute 25 29 F5.2 SEC Second 30 34 F5.2 LAT Latitude, Degrees North 35 40 F6.2 LON Longitude, Degrees West 41 42 I2 DEPTH Depth, km 44 46 F3.1 MB Body wave magnitude (Nuttli) 47 49 F3.1 MBLG LG wave magnitude (Nuttli) 50 52 F3.1 ML Local magnitude 53 55 F3.1 MS 20 second surface wave magnitude 56 58 F3.1 M Magnitude, type unknown 59 61 F3.1 MC Coda duration magnitude 62 64 F3.1 MN Nuttli magnitude 66 66 A1 ITM Intensity to magnitude conversion code 67 71 F5.1 LNFA Felt Area (natural log of km**2) 72 72 A1 UI Intensity uncertainty 73 77 F5.1 INT Epicentral Intensity (MMI) 79 79 A1 UM Uncertainty in magnitude and method of estimation 80 80 A1 UL Uncertainty in location 81 81 I1 REG EPRI TEC region 83 83 I1 GD Global Default 87 89 A3 SRC Data source code 91 95 F5.2 MB* Uniform magnitude for b-value calculation 96 100 F5.2 MBEST Best estimate magnitude 101 105 F5.2 MBVAR Variance of mb 108 111 A4 IDMAIN EQID of main shock 114 122 A9 ENTR Entry Tacking: TEC #, DD MM YY 124 124 I1 MT Type of NCEER magnitude: 1 - Instrumental; 2 = Felt Area; 3 = Maximum Intensity 125 128 F4.1 MAG NCEER magnitude
For more details see "NCEER-91 Earthquake Catalog for the United States" by J. Armbruster and L. Seeber, published by National Center for Earthquake Engineering Research, SUNY Buffalo, 1992.