An earthquake occurred on the Erie fault 5 kilometers beneath the town of San Gabriel.
Damage from the earthquake was greatest in nearby Fremont. The farthest report of shaking
was recorded in Stockton. Where was the earthquake's epicenter? (map shows locations)
a) Erie fault
b) San Gabriel
Where was that earthquake's hypocenter
(also called its focus)? ?
In your own words, what is the difference between a hypocenter (focus) and epicenter?
Below is a figure that is intended to look similar to the plot of stress versus time for a fault that
is on the bottom of p. 331.
TIME, MOVING FORWARD FROM LEFT TO RIGHT
Draw a bold arrow that connects to the y axis (stress levels) that shows the maximum amount
of stress that this fault can withstand before it ruptures.
On this plot, what is the evidence that an earthquake occurs?
Over what time span on this plot is the reoccurrence interval (time between earthquakes) the
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