SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK (SCSN) FORMAT CATALOG DATA
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(2/8/99)
CATALOG DATA
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The earthquake catalog of the SCSN consists of data from 1932 through
the present. It is complete for local events greater than or equal to
M3.0 since 1932, and above M1.8 since 1981. Between the time periods of
January 1984 through the present, it is complete for all magnitude events.
SCSN catalog data in the Caltech format (described below) is stored in
yearly ascii *.catalog files. Beginning with 1975, these files cover a time
period of one year. Events from 1932 to 1959 are listed in 193259.catalog;
1960 to 1974 events in 196074.catalog.
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SCSN (CALTECH Format) and "year.catalog" file specification
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col len format name comment
--- --- ------ ---- -------
1 4 i4 year
6 2 i2 mon
9 2 i2 day
13 2 i2 hour (UTC time, is either 7 or 8 hours ahead of
local time)
16 2 i2 min
19 5 f5.2 sec
26 2 i2 lat degrees (0.00 for regional & teleseismic events)
29 5 f5.2 lat minutes ( " " " " " " )
34 5 i4 lon degrees ( " " " " " " )
( minus sign represents west longitude)
39 5 f5.2 lon minutes ( " " " " " " )
45 1 a1 quality location quality
'A' +- 1 km horizontal distance
+- 2 km depth
'B' +- 2 km horizontal distance
+- 5 km depth
'C' +- 5 km horizontal distance
no depth restriction
'D' >+- 5 km horizontal distance
**** BUYER BEWARE ****
Event qualities are highly suspect prior
to 1990. Many of these event qualities
are based on incomplete information.
Also, they are really only applicable
to LOCAL events
47 3 f3.1 mag
55 5 f5.2 depth
60 3 i3 nph number of picked phases
67 4 f4.2 rms sum of rms of all picked stations
72 7 i7 id event id number (i.e. cuspid)
Total card width = 78
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Plotting format specification (hypoinverse format)
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col len format name comment
--- --- ------ ---- -------
1 2 i2 yr
3 2 i2 mon
5 2 i2 day
6 2 i2 hour (UTC time - is either 7 or 8 hours ahead of
local time)
8 4 i4 min
11 4 i4 sec to the hundredths place (e.g. 50.06 sec)
15 2 i2 lat (degrees)
18 4 i4 lat (minutes, e.g. 1597 = 15.97)
22 3 i3 long (degrees)
26 4 i4 lat (minutes, e.g. 2928 = 29.28)
31 4 i4 depth (e.g. 1253 - 12.53 km)
68 2 i2 mag (e.g. 19 = 1.9)
70 1 a1 quality (same as above)