A Computer-Based System for Interactive Processing of Earthquake Seismograms Recorded on Microfilm

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"We briefly describe a computer-based system for interactive processing of earthquake seismograms recorded on up to four reels of 16 mm microfilm which eliminates the major weaknesses in the multi-step processing procedure described previously. This is an important development because for the forseeable future, 16mm microfilm will remain the principal recording media for the USGS southern Alaska seismic network. In addition, the system provides a convenient tool for special seismological research requiring repetitive waveform measurements made from microfilm. The basic system design is outlined below, and the interested reader may consult a report by Astrue et al. (1983) for details."


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