An Instrumental Earthquake Magnitude Scale¶
Richter, C. F. (1935). An Instrumental Earthquake Magnitude Scale. Bulletin of the Seismological Society of America, 25(1), 1-32.
Cited by¶
2 citations across 2 artifacts.
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Primes¶
- Logarithmic Perception and Encoding
- Instrument scales — pH, Richter and moment-magnitude, stellar magnitudes, and decibels are all logarithmic re-encodings of physical quantities.
This sourceDefines earthquake magnitude as the base-10 logarithm of recorded amplitude, an instrument scale modeled on Pogson's logarithmic stellar-magnitude system; pH (Sørensen) and the decibel are analogous logarithmic re-encodings of physical quantities.
- Instrument scales — pH, Richter and moment-magnitude, stellar magnitudes, and decibels are all logarithmic re-encodings of physical quantities.
Mechanisms¶
- Rough Order-of-Magnitude Estimate
- This is why so many natural quantities are reported on logarithmic scales — the Richter magnitude scale, decibels, pH — where a single integer step already means a tenfold change and finer digits would mislead.
This sourceDefines earthquake magnitude logarithmically, so one unit corresponds to a tenfold change in recorded amplitude.
- This is why so many natural quantities are reported on logarithmic scales — the Richter magnitude scale, decibels, pH — where a single integer step already means a tenfold change and finer digits would mislead.
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