Multiple Choice
The geologist C. F. Richter defined the magnitude of an earthquake to be where I is the intensity of the quake (measured by the amplitude of a seismograph 100 km from the epicenter) and S is the intensity of a "standard" earthquake (where the amplitude is only
cm) . The 1989 Loma Prieta earthquake that shook San Francisco had a magnitude of
on the Richter scale. The 1906 San Francisco earthquake was
times as intense. What was its magnitude on the Richter scale?
A)
B)
C)
D)
E)
Correct Answer:

Verified
Correct Answer:
Verified
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