The magnitude of an earthquake, R. is defined by R = log10
Ic
where I is the intensity of the
earthquake (measured by the amplitude of a seismograph reading taken 100 km from the epicenter of
the earthquake) and In is the intensity of a "standard earthquake" (whose amplitude is 1 micron
10-4 cm).
The 1906 San Francisco earthquake had a magnitude of 8.3 on the Richter scale. At the same time in
South America there was an eathquake with magnitude 5.4 that caused only minor damage. How many
times more intense was the San Francisco earthquake than the South American one? Round your
answer to two decimal places.
The San Francisco earthquake was
Earthquake.
times more intense than the South American