The magnitude of an earthquake is measured by :

[amp_mcq option1=”Tiltmeter” option2=”Richter scale” option3=”Seismograph” option4=”Seismometer” correct=”option2″]

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UPSC CISF-AC-EXE – 2023

The magnitude of an earthquake, which represents the energy released at the earthquake’s source, is measured using scales like the Richter scale or, more commonly today, the Moment Magnitude Scale.

– **Richter scale (B):** An early scale used to measure the magnitude of earthquakes based on the amplitude of the largest seismic wave recorded.
– **Seismograph (C) / Seismometer (D):** These are instruments used to detect and record the ground motion caused by seismic waves from an earthquake. The data recorded by a seismograph is used to calculate the magnitude and locate the earthquake, but the instrument itself measures motion, not magnitude directly.
– **Tiltmeter (A):** An instrument used to measure very small changes in the inclination of the ground surface, often used to monitor volcanic activity or ground deformation.

While the Richter scale is well-known, the Moment Magnitude Scale is now the preferred method for measuring earthquake magnitude globally, especially for larger earthquakes, as it provides a more accurate estimate of the total energy released. Both are scales used to quantify magnitude, distinct from the instruments used to record seismic waves.

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