Timely interpretation of data is essential in volcano monitoring. I developed a system at the Cascades Volcano Observatory (CVO) to provide near-real time acquisition and display in graphic for of low-frequency data (sample rates less than or equal to 1 minute). Data from the low-data-rate telemetry network and real-time seismic-amplitude system are transferred to a central computer at 10-minute and 1-minute intervals, respectively. Data collected manually are entered into the central computer by hand, while data from remote telemetry networks are collected weekly through a dial-up procedure. In the central computer, the program BOB, which I developed at CVO, provides for rapid interpretation of data by displaying them in graphic form. Although at CVO a VAX 11/750 is used as the central computer, the system can also use an IBM PC XT/AT or compatible for the central computer, increasing the system's portability.
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