seismograph :

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  • n  a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)

  • Seismograph needles, the world over, jumped wildly a fortnight ago.
  • In the Benioff seismograph, earth movements are magnified 200,000 times.
  • This involves setting off charges of dynamite, measuring the time required for the earth ripples to reach a seismograph planted some distance away, studying the wavy lines on .
News & Articles

  • Small Earthquake Reported In Marshall County
    MARSHALL COUNTY, OK -- Another small earthquake in Texoma was sizeable enough to register on the seismograph. The apparent quake happened around 3 a.m. Sunday in Marshall County.According to the U.S. Geological
    July 1, 2013 - KTEN North Texas & Southeastern Oklahoma

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