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A '''seismograph''' is a scientific [[instrument]] that detects and records [[vibration]]s ([[seismic wave]]s) produced by [[earthquake]]s. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>
A '''seismograph''' is a scientific [[instrument]] that detects and records [[vibration]]s ([[seismic wave]]s) produced by [[earthquake]]s.<ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>
==References==
==References==