The measurement of seismographic records using a computer-controlled film scanner

A semi-automatic system to digitize seismographic records is described. Photographic images of the records are digitized using a cathode-ray-tube film scanner that is controlled by a computer. An operator, interacting with the computer through a display console, supervises the overall data collection and can intervene in the search for traces and in the digitization of the data whenever he feels that it is necessary.