Comments on: Whats the relationship motion on a seismograph, versus true motion of the ground where the seismograph is loca? http://earthquakequestions.com/whats-the-relationship-motion-on-a-seismograph-versus-true-motion-of-the-ground-where-the-seismograph-is-loca.htm Everything You Want To Know About Earthquakes Sat, 28 Jan 2012 23:45:02 +0000 hourly 1 http://wordpress.org/?v=3.3 By: 3.14159265358979323846 http://earthquakequestions.com/whats-the-relationship-motion-on-a-seismograph-versus-true-motion-of-the-ground-where-the-seismograph-is-loca.htm/comment-page-1#comment-3436 3.14159265358979323846 Fri, 21 Aug 2009 14:09:17 +0000 http://earthquakequestions.com/whats-the-relationship-motion-on-a-seismograph-versus-true-motion-of-the-ground-where-the-seismograph-is-loca.htm#comment-3436 it's opposite it’s opposite

]]> By: Ryan P http://earthquakequestions.com/whats-the-relationship-motion-on-a-seismograph-versus-true-motion-of-the-ground-where-the-seismograph-is-loca.htm/comment-page-1#comment-3437 Ryan P Fri, 21 Aug 2009 14:09:17 +0000 http://earthquakequestions.com/whats-the-relationship-motion-on-a-seismograph-versus-true-motion-of-the-ground-where-the-seismograph-is-loca.htm#comment-3437 no no

]]> By: mission cat http://earthquakequestions.com/whats-the-relationship-motion-on-a-seismograph-versus-true-motion-of-the-ground-where-the-seismograph-is-loca.htm/comment-page-1#comment-3438 mission cat Fri, 21 Aug 2009 14:09:17 +0000 http://earthquakequestions.com/whats-the-relationship-motion-on-a-seismograph-versus-true-motion-of-the-ground-where-the-seismograph-is-loca.htm#comment-3438 The seismograph measures the ACCELERATION of the earth. Acceleration is how fast the velocity of the ground increases (or decreases). To find out how far the ground actually moves in feet, you must double integrate the seismograph signal. The first integration of the acceleration yields the velocity. The second integration yields the translation or position movement. The seismograph measures the ACCELERATION of the earth. Acceleration is how fast the velocity of the ground increases (or decreases).

To find out how far the ground actually moves in feet, you must double integrate the seismograph signal.

The first integration of the acceleration yields the velocity.

The second integration yields the translation or position movement.

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