The SCEDC has been working toward compiling and converting all available historic seismic data holdings to create a single-source for online access to southern California earthquake data. Older parametric data has been loaded into the SCEDC Oracle 9i database; waveform data has been converted into the modern archival format and is available for download via STP.

• The 1932-1976 era of seismic data was hand-typed from the original phase cards into electronic CUSP (Caltech-USGS Seismic Processing) format from the original hand-derived phase card solutions. The data was then imported into the SCEDC Oracle database, so phase and epicenter data is available for direct retrieval by users.
  
  
• A problematic year span of CEDAR data, 1980, is currently not accessible, but has been converted and is being processed to include magnitude information. The waveform data was read from tape and loaded onto the CUSP VAX system and converted to mSEED format. When this project is complete, the Data Center will have a single, uniform catalog spanning 1932-present.
  
  
• The parametric data from 1981 to present has been loaded into the Oracle 9i database system and the waveforms for that time period have been converted to mSEED format and are accessible through the STP interface. Quality control verification of 1981-2000 historic parametric and waveform data has progressed using a detailed reverse-chronological examination and verification of magnitudes.