seismometer seismometeran instrument that records ground movement; used to detect and measure earthquakesRelated Articles: Glossary: seismic waveHow is sound used to study the Earth's history?EarthquakeHow is sound used to explore for oil and gas?How is sound used to monitor nuclear testing?How is sound used to study undersea earthquakes?Iceberg CollisionsHow is sound used to study underwater volcanoes?Ocean EngineerMarine Seismologist Chris Knowlton2017-10-27T13:43:29-05:00