Which one of the following statements concerning foci and epicenters is correct?
a.) The epicenter is at the surface directly above the focus where the earthquake initiates.
b.) The focus is the faulted point on the surface directly above the epicenter.
c.) The earthquake starts at the focus and the rupture extends down to the epicenter.
d.) The fault first cracks at the epicenter and breaks through to the surface at the focus.
Ans: a.) The epicenter is at the surface directly above the focus where the earthquake initiates.
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