seismograph (redirected from seismographer)

seis·mo·graph  (szm-grf)

n.

An instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake.

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seis·mogra·pher (sz-mgr-fr) n.

seismo·graphic (-grfk), seismo·graphi·cal (--kl) adj.

seis·mogra·phy n.

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seismograph

Noun

an instrument that records the intensity and duration of earthquakes [Greek seismos earthquake + -graph]

seismographer n
seismography n

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seismograph  (szm-grf)

An instrument that detects and records vibrations and movements in the Earth, especially during an earthquake. Most seismographs employ a pendulum mounted within a rigid framework and connected to a mechanical, optical, or electromagnetic recording device. When the Earth vibrates or shakes, inertia keeps the pendulum steady with respect to the movements of the frame, producing a graphic record of the duration and intensity of the Earth's movements. Separate instruments are needed to record the north-south horizontal, east-west horizontal, and vertical components of a tremor. By comparing the records produced by seismographs located in three or more locations across the Earth, the location and strength of an earthquake can be determined.

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seismograph

an instrument for measuring and recording the intensity of earth tremors.

See also: Instruments

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any of various devices for measuring and recording the vibrations and intensities of earthquakes. — seismographer, n. — seismographic, seismographical, adj.

See also: Earthquakes

Thesaurus

Noun

1.

seismograph - a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake) measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something