Albuquerque Seismological Laboratory

To all potential users of WWSSN historical data:

The USGS Albuquerque Seismological Laboratory (ASL) has in its possession one nearly complete set WWSSN film chips. The film chip library consists mainly of 70 mm images (and, in some cases, 9 mm images) of the original, photographically recorded WWSSN analog seismograms. There are approximately 5 million images in the archive. Although we cannot loan out the film chips, it is possible to scan them at high resolution. This scanning process does NOT digitize the waveforms. Instead, it produces a digital image of the seismogram. Examples may be viewed at Film Scans.

The ASL has scanned a small subset of the film chips and a number of these are available at the IRIS Data Management Center through the Searchable Product Depository. Other images require processing before being made available through IRIS.

If you are looking for particular records, please contact us. We can tell you what station/dates are already available. For seismogram images not yet scanned, the cost is approximately $2.00/image. However, this cost may be less in the future.