usgs.cat - text file format
evc_2002cat.xls - Excel spreadsheet format
-------------------

This Centennial database differs from the one published in Willie 
Lee's Handbook in that I have replaced all hypocenters for which 
George has determined broadband depths with hypocenters that have
been re-determined using George's depths corrected for bathymetry 
at the epicenter (isol=BEQ).

The catalog has a cut-off using the preferred magnitude of
5.5 of greater for the 1964-present period and 6.5 or greater for the 
1900-1963 period. All magnitude caveats, with one exception (see below), 
still follow the rules set in the paper that Antonio and Engdahl published in 
Willie Lee's Handbook.

(1) The catalog has been extended to April 1, 2002.

(2) The catalog now includes updated broadband energy ME and moment 
    tensor Mw estimates made by Choy and Sipkin, respectively.

(3) The catalog now includes all magnitudes listed on the USGS 
    "Magnitudes of Significant Earthquakes" list and assigns them 
    the highest magnitude preference. These magnitudes are entered 
    with scales of M, Ms or ML and the source is given as "GSX".

What's next?

(1) Replace the data files for 2000-2001 with ISC phase data, 
    recompute all hypocenters, enter ISC mb and Ms magnitudes,
    and update USGS.CAT with these data.

(2) Start to work on ways in which the catalog can be extended 
    to lower magnitudes.

The format is described below. Keep in mind that the first 
listed magnitude in CENT.CAT is the preferred magnitude.
---------------------------

CAT FILE FORMAT

Fortran read statement:

       integer yr,day,hr,greg
       read(1,100) icat,asol,isol,yr,mon,day,hr,min,sec,
     1 glat,glon,dep,greg,ntel,(mag(k),msc(k),mdo(k),k=1,12)
  100  format(a6,a1,a5,i4,2i3,1x,2i3,f6.2,1x,2f8.3,f6.1,2i4,
     1 12(f4.1,1x,a2,1x,a5))

Variable definitions:

icat         source catalog

             EHB  = EHB origin time & hypocenter

             (otherwise from other catalogs)

asol         open azimuth of teleseismic
             stations (delta > 28 deg) used

             for the period 1900-1963

             blank = unknown
             A     = <  180 deg
             B     = <  210 deg and  > 180 deg
             C     = <  240 deg and  > 210 deg
             D     = <  270 deg and  > 240 deg
             F     = >  270 deg

             for the period 1964-1999

             blank = <  180 deg
             Z     = >= 180 deg

isol         solution type 

             HEQ = origin time & hypocenter fixed
             DEQ = depth free
             BEQ = depth fixed at USGS BB depth 
                   (adjusted for topo/bath)
             CEQ = depth fixed at Engdahl cluster 
                   (multiple event) depth
             FEQ = depth fixed by Engdahl based 
                   on independent information
             LEQ = depth fixed by program
             XEQ = poor solution

             other info

             M   = focal mechanism available
             Mx  = cluster (multiple event) 
                   location known to x km is
                   available

yr           year
mon          month
day          day

hr           origin hour
min          origin minute
sec          origin second

glat         geographic latitude
glon         geographic longitude

dep          focal depth

greg         Flinn-Engdahl geographic region number

ntel         number of teleseismic observations
             (delta > 28 deg) used in solution                  

             magnitudes (up to 8) - first listed
             is magnitude used for event selection

mag          magnitude
msc          scale
mdo          source