Charles Francis Richter

Charles RichterCharles F. RichterRichter, Charles Francis
Charles Francis Richter ; April 26, 1900 – September 30, 1985) was an American seismologist and physicist.wikipedia
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Richter magnitude scale

Richter scalemagnitudeRichter magnitude
Richter is most famous as the creator of the Richter magnitude scale, which, until the development of the moment magnitude scale in 1979, quantified the size of earthquakes.
The so-called Richter scale – also Richter magnitude or Richter magnitude scale, more accurately but informally Richter's magnitude scale – for measuring the strength ("size") of earthquakes refers to the original "magnitude scale" developed by Charles F. Richter and presented in his landmark 1935 paper.

Moment magnitude scale

moment magnitudeM w magnitude
Richter is most famous as the creator of the Richter magnitude scale, which, until the development of the moment magnitude scale in 1979, quantified the size of earthquakes.
Charles F. Richter then worked out how to adjust for epicentral distance (and some other factors) so that the logarithm of the amplitude of the seismograph trace could be used as a measure of "magnitude" that was internally consistent and corresponded roughly with estimates of an earthquake's energy.

Beno Gutenberg

Gutenberg, BenoB. GutenbergGutenberg
Inspired by Kiyoo Wadati's 1928 paper on shallow and deep earthquakes, Richter first used the scale in 1935 after developing it in collaboration with Beno Gutenberg; both worked at the California Institute of Technology.
He was a colleague and mentor of Charles Francis Richter at the California Institute of Technology and Richter's collaborator in developing the Richter magnitude scale for measuring an earthquake's magnitude.

Earthquake

earthquakesseismic activityseismic
Richter is most famous as the creator of the Richter magnitude scale, which, until the development of the moment magnitude scale in 1979, quantified the size of earthquakes.
The first scale for measuring earthquake magnitudes was developed by Charles F. Richter in 1935.

Kiyoo Wadati

Inspired by Kiyoo Wadati's 1928 paper on shallow and deep earthquakes, Richter first used the scale in 1935 after developing it in collaboration with Beno Gutenberg; both worked at the California Institute of Technology. Together, Richter and Gutenberg devised the scale that would become known at the Richter scale to fill this need, based on measuring quantitatively the displacement of the earth by seismic waves, as Kiyoo Wadati had suggested.
It was Wadati's 1928 paper on shallow and deep earthquakes, comparing maximum below surface displacement against distance from the epicentre, which led Charles Richter to develop his earthquake magnitude scale in 1935.

Overpeck, Ohio

Overpeck
Richter was born in Overpeck, Ohio.
*Charles Francis Richter, seismologist and eponym of Richter scale.

California Institute of Technology

CaltechCalifornia Institute of Technology (Caltech)Cal Tech
Inspired by Kiyoo Wadati's 1928 paper on shallow and deep earthquakes, Richter first used the scale in 1935 after developing it in collaboration with Beno Gutenberg; both worked at the California Institute of Technology. The Seismology Lab at the California Institute of Technology wanted to begin publishing regular reports on earthquakes in southern California and had a pressing need for a system of measuring the strength of earthquakes for these reports.
Seismologist Charles Richter, also an alumnus, developed the magnitude scale that bears his name, the Richter magnitude scale for measuring the power of earthquakes.

Seismology

seismicseismologistseismologists
Charles Francis Richter ; April 26, 1900 – September 30, 1985) was an American seismologist and physicist.

Los Angeles High School

Los AngelesLos Angeles (CA)L.A. High School
After graduating from Los Angeles High School he attended Stanford University and received his undergraduate degree in 1920.

Modified Mercalli intensity scale

Mercalli intensityMercalli intensity scaleMMI
The Mercalli scale uses Roman numerals and classifies earthquakes from I to XII, depending on how buildings and people responded to the tremor.
The Wood–Neumann scale was revised in 1956 by Charles Francis Richter and published in his influential textbook Elementary Seismology.

Caltech Seismological Laboratory

Seismological LaboratoryCaltechCaltech's Seismological Laboratory
The Seismology Lab at the California Institute of Technology wanted to begin publishing regular reports on earthquakes in southern California and had a pressing need for a system of measuring the strength of earthquakes for these reports.

Giuseppe Mercalli

Mercalli, Giuseppe
At the time when Richter began a collaboration with Gutenberg, the only way to rate shocks was a scale developed in 1902 by the Italian priest and geologist Giuseppe Mercalli.
It was later improved by Charles Richter, developer of the Richter scale.

United States

AmericanU.S.USA
Charles Francis Richter ; April 26, 1900 – September 30, 1985) was an American seismologist and physicist.

Physics

physicistphysicalphysicists
Charles Francis Richter ; April 26, 1900 – September 30, 1985) was an American seismologist and physicist.

Logarithmic scale

logarithmiclogarithmic unitLog
The quote "logarithmic plots are a device of the devil" is attributed to Richter.

Baden-Baden

BadenSteinbachBaden Baden
Richter had German heritage: his great-grandfather came from Baden-Baden (Baden-Württemberg, Germany) in 1848 due to political instability.

Baden-Württemberg

Baden-WuerttembergBaden-WurttembergBaden Württemberg
Richter had German heritage: his great-grandfather came from Baden-Baden (Baden-Württemberg, Germany) in 1848 due to political instability.

German revolutions of 1848–1849

Revolutions of 1848 in the German statesRevolution of 1848Revolutions of 1848
Richter had German heritage: his great-grandfather came from Baden-Baden (Baden-Württemberg, Germany) in 1848 due to political instability.

Stanford University

StanfordLeland Stanford Junior UniversityUniversity of Stanford
After graduating from Los Angeles High School he attended Stanford University and received his undergraduate degree in 1920.

Carnegie Institution for Science

Carnegie Institution of WashingtonCarnegie InstitutionCarnegie Institute
Richter went to work at the Carnegie Institution of Washington in 1927 after Robert Millikan offered him a position as a research assistant there, where he began a collaboration with Beno Gutenberg.

Robert Andrews Millikan

Robert MillikanRobert A. MillikanMillikan
Richter went to work at the Carnegie Institution of Washington in 1927 after Robert Millikan offered him a position as a research assistant there, where he began a collaboration with Beno Gutenberg.

Research assistant

research officergraduate research assistantResearch Assistantships
Richter went to work at the Carnegie Institution of Washington in 1927 after Robert Millikan offered him a position as a research assistant there, where he began a collaboration with Beno Gutenberg.

Displacement (vector)

displacementdisplacement vectordisplacements
Together, Richter and Gutenberg devised the scale that would become known at the Richter scale to fill this need, based on measuring quantitatively the displacement of the earth by seismic waves, as Kiyoo Wadati had suggested.

Seismic wave

seismic wavesseismic velocitybody wave
Together, Richter and Gutenberg devised the scale that would become known at the Richter scale to fill this need, based on measuring quantitatively the displacement of the earth by seismic waves, as Kiyoo Wadati had suggested.

Astronomy

astronomicalastronomerastronomers
The name "magnitude" for this measurement came from Richter's childhood interest in astronomy - astronomers measure the intensity of stars in magnitudes.