New page: A scientific instrument that detects and records vibrations (seismic waves) produced by earthquakes. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano a...
A scientific instrument that detects and records vibrations (seismic waves) produced by earthquakes. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref>