SOUTHERN CALIFORNIA EARTHQUAKE DATA CENTER CATALOG FORMAT 
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				 (04/11/00)  

The SCEDC catalog consists of hypocentral information for the following
time periods. 

			April 1, 1981 - January 31, 1983 
			July 13, 1983 - present

These time periods represent the time periods for which "digital" waveform
and phase arrival data are available from the SCEDC, and for which events
have been completely processed by the Southern California Seismic Network.

The SCEDC catalog is complete for local events greater than or equal to 
M1.8 since 1981. The time gap in 1983 represents data where the
Southern California Seismographic Network has not completely processed the 
events, and made hypocenters, magnitudes and phase data available to the
Data Center.  

   SCEDC format catalog data (described below) are stored in
yearly ascii *.catalog files.
==============================================================================
		      	SCEDC CATALOG FORMAT specification
==============================================================================

	col len format name	comment
	--- --- ------ ----	-------
	 1  10   a10   date	yr/mn/day	
	12  10   a10   time	hr:mn:sec   (UTC time, either 7 or 8 hours
					     ahead of local time)	
	23   1    a1   eventype	type of event
					local (L)
					regional (R)
					teleseism (T)
					quarry blast (Q)
					dubious location (D)
	25   3   f3.1  magnitude
	29   1    a1   magtype	type of magnitude
					'e'	energy magnitude
					'w'	moment magnitude
					'b'	body-wave magnitude
					's'	surface-wave magnitude
					'l'	local (WOOD-ANDERSON) magnitude
					'c'	coda amplitude 
					'h'	helicorder magnitude
					'd'	coda duration magnitude
					
        32   7   f7.3  lat      deg.min  
        39   8   f8.3  lon	deg.min 
	48   5   f5.1  depth
	54   2    a2   quality  eventquality
					'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
	56   7    a7   eventid  eventid for particular earthquake 
	63   4	  i4   nph	number of picked phases
	67   4    i4   ngrams   number of gram cards
                                           (i.e. # of station traces)
        71   4    i4   nterr    number of TERRAscope files
        74   3    i3   nport    number of Portable instrument files