RELATING CONCEPTS For Individual or Group Work (Exercises 91–94)
In 1935, Charles F. Richter devised a scale to compare the intensities of earthquakes. The intensity of an earthquake is measured relative to the intensity of a standard zero-level earthquake of intensity
For example, if an earthquake has magnitude 5.0 on the Richter scale, then its intensity is calculated as
which is 100,000 times as intense as a zero-level earthquake.
To compare two earthquakes, such as one that measures 8.0 to one that measures 5.0, calculate the ratio of their intensities.
An earthquake that measures 8.0 is 1000 time as intense as one that measures 5.0.
The table lists information for selected earthquakes with their years, locations, and magnitudes. Work Exercises 91–94 in order.
Year | Earthquake Location | Richter Scale Measurement |
1960 | Chile | 9.5 |
1952 | Kamchatka | 9.0 |
2007 | Southern Sumatra, Indonesia | 8.5 |
2013 | Obihoro, Japan | 6.9 |
2002 | Hindu Kush, Afghanistan | 5.9 |
Source: earthquake.usgs.gov |
Compare the intensity of the 2013 Obihoro earthquake with the 2002 Hindu Kush earthquake.
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Beginning and Intermediate Algebra (6th Edition)
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