From late 1987 to early 1990 the Cascades Volcano Observatory (CVO) installed and operated two different seismic-data-acquisition systems for a small seismic network. The systems were set up to detect and record small earthquakes beneath Mount St. Helens from a 14-to 16-station seismic network. The first data-acquisition system is a PC/AT system, which utilizes software distributed by the International Association of Seismology and Physics of the Earth's Interior (IASPEI). The second system uses a Sun workstation, an analog-to-digital subsystem with a SCSI interface, and data-acquisition software written for computers that use the UNIX operating system. Recording with both systems in 1989 gave CVO the opportunity to evaluate two relatively inexpensive digital seismic data acquisition systems. Both systems were easy to install and performed as expected.
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