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seismograph
[ sahyz-muh-graf, -grahf, sahys- ]
noun
- any of various instruments for measuring and recording the vibrations of earthquakes.
seismograph
/ saɪzˈmɒɡrəfə; ˈsaɪzməˌɡrɑːf; ˌsaɪzməˈɡræfɪk; -ˌɡræf /
noun
- an instrument that registers and records the features of earthquakes. A seismogram ( ˈsaɪzməˌɡræm ) is the record from such an instrument Also calledseismometer
seismograph
/ sīz′mə-grăf′ /
- 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.
Derived Forms
- seismographic, adjective
- seisˈmography, noun
- seismographer, noun
Other Words From
- seis·mo·graph·ic [sahyz-m, uh, -, graf, -ik, sahys-], seismo·graphi·cal adjective
Word History and Origins
Origin of seismograph1
Example Sentences
He was curious to see the result as recorded on the seismograph, and to know at what hour it registered in Japan.
The following brief account of his seismograph will, therefore, form a not unsuitable complement to his Memoir.
When this is done, however, I trust that due notice will be given, so that the seismograph stations may have fair warning.
But even at noon the disturbance had not subsided, as slight shocks are recorded at frequent intervals on the seismograph.
The seismograph of to-day, however, has reached a stage of perfection where close approximations are obtained in the records made.
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