Scanned Paper Seismograms 1963-1992
The Caltech Seismological Lab has made available 12,223 scanned images of pre-digital analog recordings of major earthquakes recorded in Southern California between 1963 and 1992. Scanned images of paper records for M>3.5 southern California earthquakes and several significant teleseisms are available for download via the SCEDC through this search tool.
Additional information on this project is available:
List of local M>3.5 events (1963-1992)
File format and naming convention
A primer on How to Read Drum Seismograms