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seismograph
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Anderson-Wood torsion pendulum seismograph
How a seismometer works
Zhang Heng: seismoscope Palmieri, Luigi: seismograph Milne, John: horizontal pendulum seismograph Press-Ewing seismograph
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How the Richter scale relies on vibration to track earth tremors
strain seismograph
Learn about an app used to build an early warning network for earthquakes
Quizzes
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Videos

How a seismometer works
Geophysicist Horst Rademacher of the University of California, Berkeley, simulating...
Video: Displayed by permission of The Regents of the University of California. All rights reserved. (A Britannica Publishing Partner)
How earthquakes are measured: Demonstrating magnitude
We're picking up earthquake vibrations.
Video: Encyclopædia Britannica, Inc.
How the Richter scale relies on vibration to track earth tremors
The Richter scale and how it measures earthquake magnitude. The Richter scale calculates...
Video: Encyclopædia Britannica, Inc.
Learn about an app used to build an early warning network for earthquakes
A scientist from the UC Berkeley Seismology Lab in 2016 describing the MyShake app,...
Video: Displayed by permission of The Regents of the University of California. All rights reserved. (A Britannica Publishing Partner)
Discern between body and surface waves, primary and secondary waves, and Love and Rayleigh waves
The shifting rock in an earthquake causes vibrations called seismic waves that travel...
Video: Encyclopædia Britannica, Inc.

Images

Anderson-Wood torsion pendulum seismograph
Schematic diagram of a 1924 Anderson-Wood torsion pendulum seismograph, the type...
Encyclopædia Britannica, Inc.
Zhang Heng: seismoscope
Model of Zhang Heng's seismoscope (seismograph), which he invented about 132
© SSPL/Getty Images
Palmieri, Luigi: seismograph
A sketch of Italian scientist Luigi Palmieri's seismograph.
The Eruption of Vesuvius in 1872 by Luigi Palmieri (Asher and Company, London, 1873)
Milne, John: horizontal pendulum seismograph
Horizontal pendulum seismograph, as invented by English seismologist John Milne in...
Encyclopædia Britannica, Inc.
Press-Ewing seismograph
The Press-Ewing seismograph, developed in the United States for recording long-period...
M. Van Camp/Royal Observatory of Belgium.
strain seismograph
Schematic diagram of a strain seismograph. A and B are two piers separated by a distance,...
Encyclopædia Britannica, Inc.
seismic wave: main types
Diagram showing the main types of seismic waves: P (primary), S...
Encyclopædia Britannica, Inc.
seismic waves: travel-time curve
The relation between the arrival time of the P and S waves and...
Encyclopædia Britannica, Inc.
seismic exploration
Geophysicists searching for oil by using seismic equipment. Sound impulses are put...
Encyclopædia Britannica, Inc.
Buzz Aldrin on the Moon
Apollo 11 astronaut Buzz Aldrin setting up the Passive Seismic Experiments Package...
NASA
seismograph data
Seismic wave data being recorded by a seismograph during an earthquake.
© Wf Sihardian—EyeEm/Getty Images
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