Definition
A seismograph is an instrument used to detect and record ground motion caused by seismic waves.
Discussion
A seismograph typically consists of three components – a sensor (seismometer), an amplifier or digitizer, and a recording device. Although seismographs have evolved over the years, all operate on the same basic principles by measuring ground motion relative to something that remains fixed or unaffected by the shaking. Early seismographs usually consisted of a mass suspended by a spring within a case. The mass would remain still while the case shook. The relative movement was usually recorded on paper by a pen or light source. In most modern seismographs, the mass has been replaced by a permanent magnet. Ground shaking causes the magnet to generate electric signals in the wires that are wound tightly in the surrounding case. The ground motions are digitally recorded and either stored on site or transmitted to another site for archiving. The record showing the recorded...
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsBibliography
Bolt, B. A., 1993. Earthquakes. New York: W. H. Freeman.
Incorporated Research Institutions for Seismology, 2010. GSN Instrumentation, http://www.iris.edu/hq/programs/gsn/instrumentation.
Natural Resources Canada, 2010. How we record earthquakes, http://earthquakescanada.nrcan.gc.ca/info-gen/smters-smetres/seismograph-eng.php.
Richter, C. F., 1958. Elementary Seismology. San Francisco: W. H. Freeman.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer-Verlag Berlin Heidelberg
About this entry
Cite this entry
Bent, A. (2013). Seismograph/Seismometer. In: Bobrowsky, P.T. (eds) Encyclopedia of Natural Hazards. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4399-4_316
Download citation
DOI: https://doi.org/10.1007/978-1-4020-4399-4_316
Published:
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-8699-0
Online ISBN: 978-1-4020-4399-4
eBook Packages: Earth and Environmental ScienceReference Module Physical and Materials ScienceReference Module Earth and Environmental Sciences