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Montana Seismic Paper Data Collection The Earthquake Studies Office (ESO) of the Montana Bureau of Mines and Geology opened in June, 1980 to operate the Montana Regional Seismograph Network. The office collects and analyzes seismic data and reports earthquake information. The ESO also collects and stores seismograms recorded in Montana by other groups and agencies. Prior to 1989, the only method used to collect earthquake data was paper seismograms recorded on drum recorders using pen and ink, or heat pen and heat-sensitive paper. Thus, paper seismograms recorded before 1989 are original (and irreplaceable) records. Beginning August 1989, a triggered digital recording system was implemented that captured data for larger events but did not provide continuous... Categories: Physical Item; Types: Collection, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: ndc_collection