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Seismometers, seismographs and seismograms are terms which are often interchanged. They are all associated with earthquake detection. To be precise, a seismometer is a sensitive instrument which sits on or in the ground and detects earth movements or vibrations. The seismograph records the motion detected by the seismometer. The seismogram is the actual record of the motion.
The Maryland seismic network uses digital seismic records for earthquake detection. A visual record of our data can be displayed in several ways. Our online helicorder record shows a daily record of seismic activity, and is updated every 5 minutes. The Labin Online Seismograph uses Java technology to display a near real-time seismogram. Visually, this is somewhat closer to what you might see if you were looking at a mechanical seismograph. There is a slight delay (about 5 minutes) between the time motion is detected and displayed. This is due to the various steps need to process and transmit the data to your computer. See the Seismograph Help Page for more information about the online seismograph.
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