Format Description for the Earthquake Catalogue

  Earthquake Catalogue has been composed from three parts:
                                                                        
   1. (GUTE) Catalog of hypocenters and magnitudes listed in Gutenberg 
      and Richter (1954), 1904 - 1952. 
      Global Hypocenter Data Base CD-ROM, version 3.0, 1994, NEIC, USGS.

      Gutenberg, B., and  Richter,  C.F.,  1954,  Seismicity of the 
      Earth and associated phenomena;  Princeton University Press,  
      Princeton,  NJ, 310 p. 


   2. (PDE)   Preliminary   Determination  of  Epicenters,  NEIC,  USGS,
      1868-1992. Catalog of earthquakes located by the USGS NEIC and its
      predecessors  in  the U.S.  Coast and Geodetic Survey the National
      Ocean Survey,  and the Environmental Research Laboratories of  the
      Department  of  Commerce.  Listings  are  in  most cases the final
      hypocenters and magnitudes of the USGS NEIC which  are  listed  in
      the  Geological Survey publication,  "Preliminary Determination of
      Epicenters - Monthly Listing".  
      Global Hypocenter Data Base CD-ROM, version 3.0, 1994, NEIC, USGS.

   3. (PDE, PDE-W, PDE-Q) USGS/NEIC, 1973-PRESENT: 

      Catalog of earthquakes located by the USGS NEIC and its 
      predecessors in the U.S. Coast and Geodetic Survey, the National 
      Oceanic Survey, and the Environmental Research Laboratories of the 
      Department of Commerce. Listings are from three different publications:
 
      (PDE-W) PDE Weekly Listing. This file covers the time period following 
      the Monthly data up to four weeks behind the current week. The Weekly 
      PDE data are replaced by the Monthly PDE data as soon as they become 
      available. 
      USGS/NEIC Most Recent Events (PDE-Q) Daily listing, known as Quick 
      Epicenter Determinatins (QED). These data are extremely preliminary 
      and the parameters of the earthquakes are subject to change as more 
      data are used to relocate the earthquakes. The daily PDE-W covers the 
      time fram following the Weekly PDE data up to the current date. These 
      data are replaced by the Weekly PDE data. 
      (PDE) Preliminary Determinations of Epicenters, Monthly Listing. 
      This list is the most complete computation of hypocenters and 
      magnitudes done by the USGS NEIC. It is normally produced a few 
      months after the events occur. The publication is called "Preliminary" 
      because the "final" computation of hypocenters for the world is 
      considered to be the Bulletin of the Internation Seismological Centre 
      (ISC), which is produced about two years after the earthquakes occur. 
      The NEIC PDE program contributes about one-third off all data used by 
      the ISC. 
      
      http://wwwneic.cr.usgs.gov/neis/epic/epic.html

                                                                 
                                                                        
 POSITIONS   LENGTH      FORMAT      DESCRIPTION                        
            OF FIELD                                                    
    
    1- 5        5         (a5)        Catalog Source                    
    6-11        5         (a6)        Year                              
   12-13        2         (i2)        Month                             
   14-15        2         (i2)        Day                               
   16-24        9         (f9.2)      Origin Time                       
   17-18        2         (i2)        Minute                            
   25-26        2         (a2)        Coordinate/OT Authority           
   27-33        7         (f7.3)      Latitude in degrees  [- =South]   
   34-41        8         (f8.3)      Longitude in degrees [- =West]    
   42-46        5         (f5.1)      Depth in kilometers               
      47        1         (a1)        Depth Control Designator          
   48-49        2         (a2)        pP Phases                         
   50-53        4         (f4.2)      Standard Deviation                
   54-56        3         (f3.1)      mb magnitude                      
   57-58        2         (i2)        Number of mb amplitudes           
   59-61        3         (f3.1)      Ms magnitude                      
      62        1         (a1)        Z/H Component                     
   63-64        2         (i2)        Number of Ms amplitudes           
   65-68        2         (f4.2)      Contributed Mag1.                 
   69-70        2         (a2)        Magnitude Scale                   
   71-75        5         (a5)        Donor                             
   76-79        4         (f4.2)      Contributed Mag2.                 
   80-81        2         (a2)        Magnitude Scale                   
   82-86        5         (a5)        Donor                             
   87-89        3         (i3)        Flinn-Engdahl Region Number       
   90-92        3         (a3)        Station Number/Quality            
      93        1         (a1)        Intensity Value                   
      94        1         (a1)        Cultural Effects                  
      95        1         (a1)        Isoseismal Map                    
      96        1         (a1)        Fault Plane Solution flag         
      97        1         (a1)        Moment Tensor Flag                
      98        1         (a1)        ISC Depth Flag                    
      99        1         (a1)        IDE flag                          
     100        1         (a1)        Preferred Hypocenter flag         
     101        1         (a1)        Flag                              
 102-108        7         (a7)        Phenomena Codes                   
 109-115        8         (a7)        Radial Distance                   

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