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A seismometer is an instrument that responds to ground displacement and shaking caused by quakes, volcanic eruptions, and explosions. They are usually combined with a timing device and a recording device to form a seismograph. The output of such a device—formerly recorded on paper (see picture) or film, now recorded and processed digitally—is a…
History, Modern instruments & Basic principles
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Seismometer | is a | instrument that responds to ground displacement and shaking caused by quakes | 0.90 | text |
| Seismometer | is a | digital strong-motion seismometer | 0.90 | text |
| nonmagnetic invar.The hinges on a seismograph are usually patented | instance of | A seismograph is also sensitive to changes in temperature so many instruments are constructed from low expansion materials | 0.80 | text |
| and by the time the patent has expired | instance of | A seismograph is also sensitive to changes in temperature so many instruments are constructed from low expansion materials | 0.80 | text |
| the design has been improved | instance of | A seismograph is also sensitive to changes in temperature so many instruments are constructed from low expansion materials | 0.80 | text |
| the Quake-Catcher Network | instance of | but some organizations | 0.80 | text |
| can use residential size detectors built into computers to detect earthquakes as well.In reflection seismology | instance of | but some organizations | 0.80 | text |
| an array of seismometers image sub-surface features | instance of | but some organizations | 0.80 | text |
| earthquakes | instance of | This type of system uses events | 0.80 | text |
| impact events or nuclear explosions as wave sources | instance of | This type of system uses events | 0.80 | text |
| Seismometer | related to Basic principles | Earth | 0.60 | section |
| Seismometer | related to Basic principles | The | 0.60 | section |
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