Southern California Earthquake Data Center

Research Tools

Waveform Data

Scanned Paper Seismograms 1963-1992


Format

There are two output formats for the scanned results:

  1. Raster image format (TIFF) for 1-90 intermediate period record (1 sec seismometer free period, 90 sec galvanometer free period) and 30-90 long-period record (30 sec seismometer free period, 90 sec galvanometer free period). Links to TIFF plug-ins
  2. High-resolution JPEG format for WA (Wood-Anderson) records with file sizes ranging from 3-8 Megabytes.

Naming Convention

The naming format for the scanned records follows the convention:

CI_STN_BAND_COMP_YYYYMMDD_HHMM

CI = network code.
STN = station name, such as PAS.
BAND = the seismometer/galvanometer combination.

  • WA = Wood-Anderson
  • 1-90 = intermediate period record (1 sec seismometer free period, 90 sec galvanometer free period)
  • 30-90 = long-period record (30 sec seismometer free period, 90 sec galvanometer free period)

COMP indicates the component, Z = vertical, N = north/south, E = east/west.
YYYYMMDD is the date at the beginning of the record.
HHMM is the hour & minute of the beginning of the record to the nearest hour.

Example:

CI_PAS_30-90_N_19690108_1500.tif
   = The north-south 30-90 record for Pasadena beginning at 1500 UTC on January 8, 1969.