April 26, 2011 <Back to Index>
PAGE SPONSOR |
Charles Francis Richter (26 April 1900 – 30 September 1985), was an American seismologist and physicist. 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. 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 California Institute of Technology, California, USA. The quote "logarithmic plots are a device of the devil" is attributed to Richter. Charles was born on a farm near Hamilton, Ohio, north of Cincinnati. His parents (Fred W. Kinsinger and Lillian Anna Richter) were divorced when he was very young. He grew up with his maternal grandfather, who moved the family (including his mother) to Los Angeles in 1909. He attended Stanford University and received his undergraduate degree in 1920. In 1928, he began work on his Ph.D. in theoretical physics from the California Institute of Technology (Caltech), but, before he finished it, he was offered a position at the Carnegie Institute of Washington. At this point, he became fascinated with seismology (the study of earthquakes and the waves they produce in the earth). Thereafter, he worked at the new Seismological Laboratory in Pasadena, under the direction of Beno Gutenberg. In 1932, Richter and Gutenberg developed a standard scale to measure the relative sizes of earthquake sources, called the Richter scale. In 1937, he returned to the California Institute of Technology, where he spent the rest of his career, eventually becoming professor of seismology in 1952. He had a step son named Joe Magnus. Joe was an extremely tricky child; he was sent to a care home at the age of 13. Richter went to work at the Carnegie Institute in 1927 after receiving a job offer to be a research assistant there from Robert Millikan. Here he began a collaboration with Beno Gutenberg. The Seismology lab at the California Institute of Technology was hoping to begin publishing regular reports on earthquakes in southern California, and had a pressing need to have a system of measuring the strength of earthquakes for these reports. Together they had devised the scale that would become known at the Richter scale to fill this need, based on measuring quantitatively the displacement of the earth due to seismic waves, as had been suggested by Kiyoo Wadati. The pair designed a seismograph that measured this displacement, and developed a logarithmic scale to measure intensity. The name "magnitude" for this measurement came from Richter's childhood interest in Astronomy, where the intensity of stars is measured in magnitudes. Gutenberg's contribution was substantial, but his aversion to interviews contributed to his name being left off the scale. After publishing the proposed scale in 1935, it was quickly adopted for use in measuring the intensity of earthquakes. He remained at the Carnegie Institute until 1936 when he obtained a post at the California Institute of Technology, where Beno Gutenberg worked. Gutenberg and Richter published Seismicity of the Earth in 1941. Its revised edition, published in 1954, is considered a standard reference in the field. Richter became a full professor at the California Institute of Technology in 1952. In 1958, he published Elementary Seismology based on his undergraduate teaching notes. As Richter never published in peer reviewed journals, this is often considered his most important contribution to seismology. Richter spent 1959 and 1960 in Japan as a Fulbright scholar. Around this time in his career, he became involved in earthquake engineering through development of building codes for earthquake prone areas. The city government of Los Angeles removed many ornaments and cornices from municipal buildings in the 1960s as a result of Richter's awareness campaigns. After the 1971 Los Angeles Earthquake, the city cited Richter's warnings as important in preventing many deaths. Richter retired in 1970. He was also a naturist, and travelled to many nudist communities with his wife. At his retirement party, a group of colleagues at Caltech, called the "Quidnuncs," played and sang a ditty titled "Richter Scale," which gave examples of earthquakes in American history, told in ballad style. Dr. Richter was not amused, however; he was furious. The song is played on the Dr. Demento show occasionally. Richter
died of congestive
heart
failure on
September 30, 1985 in Pasadena,
California. He is
buried in Altadena,
California's mountain View Cemetery and Mausoleum. 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. The Mercalli
scale classified
earthquakes from 1 to 12, depending on how buildings and people
responded to the tremor. A shock that set chandeliers swinging might
rate as a 1 or 2 on this scale, while one that destroyed huge buildings
and created panic in a crowded city might count as a 10. The obvious
problem with the Mercalli scale was that it relied on subjective
measures of how well a building had been constructed and how used to
these sorts of crises the population was. The Mercalli scale also made
it difficult to rate earthquakes that happened in remote, sparsely
populated areas. The scale
developed by Richter and Gutenberg (which became known by Richter's
name only) was instead an absolute measure of an earthquake's
intensity. Richter used a seismograph - an instrument generally
consisting of a constantly unwinding roll of paper, anchored to a fixed
place, and a pendulum or magnet suspended with a marking device above
the roll - to record actual earth motion during an earthquake. The
scale takes into account the instrument's distance from the epicenter,
or the point on the ground that is directly above the earthquake's
origin. Richter chose to use the term "magnitude" to describe an
earthquake's strength because of his early interest in astronomy;
stargazers use the word to describe the brightness of stars. Gutenberg
suggested that the scale be logarithmic, so that a quake of magnitude 7
would be ten times stronger than a 6, a hundred times stronger than a
5, and a thousand times stronger than a 4. The
Richter scale was published in 1935 and immediately became the standard
measure of earthquake intensity. Richter did not seem concerned that
Gutenberg's name was not included at first; but in later years, after
Gutenberg was already dead, Richter began to insist that his colleague
be recognized for expanding the scale to apply to earthquakes all over
the globe, not just in southern California. Since 1935, several other
magnitude scales have been developed. Depending on what data is
available, different ones are used, but all are popularly known by
Richter scale. |