A logarithmic scale developed in 1935/36 by Dr. Charles F. Richter and Dr. Beno Gutenberg to measure earthquake magnitude by the amount of energy released, as opposed to earthquake intensity as determined by local effects on people, structures, and earth materials.
Scale for the measurement of the magnitude of an earthquake. Each increase of one on the scale represents a ten-fold increase in the amount of ground motion on a seismograph (however, the amount of energy released is about 30 times greater).
The Richter Scale measures the magnitude of earthquakes using a decimal scale that rises from 0 to 9. A device called a seismograph detects seismic activity in the Earth's crust and translates this via a moving needle onto the Richter Scale. Tremors below 2 are generally not felt and the highest recorded 'quake occurred on offshore Chile in 1960 and measured 8.9. The earthquake itself and the tsunami (a powerful tidal wave) that followed it, caused widespread devastation to coastal Chile.
the scale developed by American seismologist Charles Richter that describes the amount of energy released by an earthquake on a scale from 1 to 10. Each whole number increase in value on the scale indicates a 10-fold increase in the energy released. Earthquakes measuring 7 to 7.9 are major and those measuring 8 or above cause widespread destruction.
A scale for measuring the magnitude or size of an earthquake. The scale relates to the energy released by an earthquake and is determined from the logarithm of the amplitudes (heights) of the seismic waves recorded at seismograph stations on the Earth's surface. More information can be found at the following sites: Severity of an earthquake (United States Geological Survey) Measuring the size of an earthquake (United States Geological Survey) Magnitude and intensity comparison (United States Geological Survey)
A logarithmic scale that measures the amount of energy released during an earthquake on the basis of the amplitude of the highest peak recorded on a seismogram. Each unit increase in the Richter scale represents a 10-fold increase in the amplitude recorded on the seismogram and a 30-fold increase in energy released by the earthquake. Theoretically the Richter scale has no upper limit, but the yield point of the Earth's rocks imposes an effective limit between 9.0 and 9.5.
scale for measuring the magnitude of an earthquake devised by the American seismologist Charles Richter. It is based on the amplitude of the seismic wave recorded by seismographs. Seismic waves Vibrations passing through the ground that result from an earthquake. They are of three principal types: Primary or P-waves - these are compression-dilation ("push-and-pull") waves that move through the Earth very quickly. Secondary or S-waves - transverse or shear ("shake") waves that move through the Earth more slowly. Long or L-waves - surface waves confined to the crust of the Earth. They travel more slowly than the P and S waves and may not be detected far from the epicentre.
The Richter scale is a logarithmic scale that measures the intensity of an earthquake. It was developed in 1935 by Charles F. Richter. The magnitude of an earthquake is calculated from the logarithm of the amplitude of waves recorded by seismographs. Beno Gutenberg also contributed to the more general application of the Richter scale. A magnitude 2.0 or less earthquake is called a microearthquake and is not felt by people. A magnitude 4.5 or more earthquake can be measured by seismographs all over the world.
Devised by C.F. Richter in 1935, an index of the seismic energy released by an earthquake (as contrasted to intensity that describes its effects at a particular place) expressed in terms of the motion that would be measured by a specific type of seismograph located 100 km from the epicentre of an earthquake.
Introduced in 1935 by Charles F. Richter, the Richter scale is a numerical scale for quantifying earthquake magnitude -- typically it refers to local magnitude, but for larger quakes, it often refers to surface-wave magnitude. (Currently, large quakes are generally assigned a moment magnitude, which is scaled to be similar, but is based on seismic moment, and a better measure of the energy of an earthquake.) Since the Richter scale is logarithmic, very small earthquakes ( microearthquakes) can have a negative magnitudes. While the scale has no theoretical upper limit, the practical upper limit, given the strength of materials in the crust, is just below 9 for local or surface-wave magnitudes (and just below 10 for moment magnitudes).