| − | 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> |