Catalogs and Documentation, 1996
We understand why you might be interested in obtaining these catalog files, but are concerned that they might be misused. We have merged catalogs from several different sources, and used fairly subjective criteria to rank our preferences. We have used simple, automated schemes to compute magnitudes and remove aftershocks. To the extent that the original catalogs are not valid research tools, neither are ours! Please read the accompanying documentation, and ask whether these catalogs suit your purpose.
| Each file is ascii data organized as follows: | |
|---|---|
| column | /description |
| 01-04 | magnitude (mb for CEUS, Mw for WUS) |
| 06-14 | longitude (degree, east) |
| 16-23 | latitude (degree, north) |
| 25-28 | depth (km) |
| 30-33 | year |
| 35-36 | month |
| 38-39 | day |
| 41-42 | hour |
| 44-45 | minute |
| 47-51 | second |
| 54-59 | name of source catalog |
The catalog files are also available via Anonymous FTP
Catalog data for contiguous 48 states.
Open-File Report 97-464 "Preparation of Earthquake Catalogs for the National Seismic-Hazard Maps: Contiguous 48 States" by Charles Mueller, Margaret Hopper, and Arthur Frankel. Condensed versions of the figures from this document are available via Anonymous FTP
Western US Moment Magnitude Catalog
Central/Eastern US Bodywave Magnitude Catalog
Catalog data for Alaska.
Alaska Moment Magnitude Catalog
Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS as to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
