(redirected from seismographic)
Also found in: Dictionary, Thesaurus.


an instrument that registers and records the features of earthquakes. A seismogram is the record from such an instrument
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


(sÿz -mŏ-graf, -grahf) An instrument used in seismology to detect and record the passage of seismic waves, normally by making a continuous recording of the position of a suspended mass in relation to a frame fixed to the ground.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an instrument that records oscillations of the ground caused by seismic waves.

Figure 1. Diagram of a seismograph: (1) seismometer weight, (2) damper (device to attenuate the free oscillations of the weight), (3) device for converting the movement of the weight into an electrical signal, (4) filter-amplifier, (5)recorder

A seismograph (Figure 1) consists of a seismometer—an instrument that receives the seismic signal—and a recording device. The basic part of the seismometer is a weight connected with the case of the instrument by elastic couplings, for example, a pendulum. The case of the instrument is rigidly fixed to the object being studied. When the object oscillates, inertia causes the weight to move relative to the case. In most modern seismometers, this movement is converted into an electrical signal, which is recorded, usually in analogue form, by a mechanical, photographic, or magnetic recorder. Coded digital recording is sometimes used to increase the dynamic range and for convenience in subsequent computer processing.

There are also simpler seismographs, in which the movement of the seismometer weight is magnified mechanically or optically and is recorded by a mechanical or photographic recorder.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


An instrument that records vibrations in the earth, especially earthquakes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Earth tremors in East Asia regularly registered by seismographic monitoring stations point to the missile testing activities of the country with the largest army in the world.
Other examples of co-operative research are support of seismographic instrumentation, ionosondes through the Canadian High Arctic Ionospheric Network (CHAIN; Jayachandran et al., 2009), and logistical support for activities in support of the UN Convention on the Law of the Sea (UNCLOS).
See, for example, Incorporated Research Institutions for Seismology, "Global Seismographic Network" (map), January 2013,
China's Minister for Commerce Gao Hucheng and Pakistan's Secretary Economic Affairs Division Shahzad Arbab signed the Agreement on Economic and Technical Cooperation and the handing over certificate of Seismographic Network.
Seismologists did not track Sandy in real time by monitoring the seismic waves the storm created, but Koper says the seismographic data of the storm suggests it might be possible to help track storms in the future using their seismicity.
Met dept to acquire advanced seismograph equipment Qatar's Meteorology Department is planning a "major" expansion of its seismographic section in the coming months, the head of the Forecasting section at the Qatar Civil Aviation Authority (QC), Abdulla al-Mannai, said yesterday.
Moreover they can benefit from journalists as seismographic advisors for how the audience would react on political positions (Lesmeister 2008).
other things, hazardous seismographic operations, poor installation and
[...] Whatever effects I may obtain by technical device are never the mere results of technique, but the very accurate registering of my seismographic needle of the tumultuous [...] and incomprehensible experiences which I have lived through and which, in the process of writing, are lived through again, differently [...] more incomprehensibly.
The work, in a seismographic manner, was to register cautions about the underlying geomorphologic processes and to critique the cost and significance of the work's constituent materials--rubbish, the origins of which effectively contribute to the despoliation of all land.
In the Sutton Building, one example displays recent projects from students alongside historic seismographic charts from the western United States.