Seismometry


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Seismometry

 

the branch of seismology that develops instruments and techniques for recording oscillations of the ground, structures, and other objects, primarily when the objects are acted upon by seismic waves. Seismometry developed in the early 20th century. The instruments used to record seismic oscillations are called seismographs and the recorded results are known as seismograms.

Existing instruments can record oscillations in the amplitude range from 10-9 m to several meters and in the frequency range from thousandths of a Hertz to tens of Hertz. Seismic waves from earthquakes, nuclear explosions, and other sources of elastic waves are recorded automatically and continuously at seismological stations. These stations are usually remote from potential sources of seismic noise, and the seismographs are mounted in underground rooms on massive foundations. For engineering investigations, seismographs are installed in ordinary buildings and structures. These engineering seismological stations are activated during earthquakes.

REFERENCE

Savarenskii, E. F., and D. P. Kirnos. Elementy seismologii i seismometrii, 2nd ed. Moscow, 1955.

D. P. KIRNOS

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The earthquake, known as the Tohoku event, was the fourth-largest recorded since the advent of modern seismometry more than 100 years ago.
(45) Shane Ingate and Jonathan Berger, eds., Prospects for Low-Frequency Seismometry: A Report of the IRIS Broadband Seismometer Workshop," Incorporated Research Institutions for Seismology, August 2005, p.
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