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Noun(1) a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake(2) a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)

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(1) A seismograph at Ferris High School showed the trembling lasted for more than 30 seconds with two distinct spikes in intensity.(2) The observatory contained a seismograph to record mining tremors, an evaporation pan and a device to record lightening strikes which are particularly virulent on the Witwatersrand.(3) Tremors had been recorded in 1908 on a seismograph 4,000 kilometers west of St. Petersburg.(4) Just as a scientist reads a seismograph to measure movements in the ground, the character of a government can be judged by the way it treats the most disadvantaged layers of society.(5) What comes out of the laboratory and what is measured in the real world by surface seismographs leaves a gap.(6) We'll also be installing additional seismographic recorders that are going to allow us to capture some of the vital, time-sensitive information about the aftershock process that is now under way.(7) Many amateurs acquire skills as lapidiaries, cutting, polishing and investigating specimens of all kinds, as photographers of landscape and geological phenomena, and even as builders of simple seismographic stations.(8) Each country affected by the disaster is to set up a tsunami warning centre to receive information from the pressure gauges, seismographs and wave sensors that will survey the ocean basin.(9) Richter, who worked in southern California, using data from seismographs - which measure earth movement - devised a method to calculate where an earthquake began, or its epicenter, and its magnitude.(10) Eventually the parties agreed on a strict monitoring plan relying on seismographs and strain gauges to assess the effect on the structure as crews installed the caissons.(11) Later, earthquake seismographs were developed that recorded digitally, and today virtually all modern seismic recordings are digital and thus involve some sort of signal processing.(12) Old-style seismographs recorded the jiggling of an earthquake on a rotating drum.(13) Traditional seismographs record straight-line movements, for example shaking, whereas ring lasers measure rotational movements like rolling or twisting.(14) The monitoring of seismic activity in Texas and studies of seismic risk are hampered by the small number of seismographic stations operating in the state.(15) This is similar to seismologists using seismographs on Earth to detect earthquakes.(16) Since there were no seismographs operating in Alaska at that time and no reports of surface faulting in the remote Alaska Range, the location of the 1912 shock is poorly known.