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How does a seismograph work? Choose all that apply. How does a seismograph work? Choose all that apply. A seismograph works by suspending a weight from bedrock, which moves during an earthquake. A rotating drum that is affixed to stationary bedrock records the relative displacement between the moving weight and the rotating drum. A seismograph can measure P waves, S waves, and surface waves. A seismograph works by suspending a weight from bedrock, which remains motionless during an earthquake. A rotating drum that is affixed to the moving bedrock moves as the rock moves, recording the relative displacement between the stationary weight and the rotating drum. A seismograph can measure only surface waves. A seismograph can measure both horizontal displacement and vertical displacement with the same unit.
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