(a) Which earthquake event is going to reach to you first?
To answer this question, we must first calculate the velocity of the waves:
v1=λf1,v2=λf2. We know the velocity, let's calculate time!
t1=v1d=λf1d=405⋅45105=5.49 s, t2=v2d=λf2d=405⋅32105=7.72 s. The first earthquake event will reach the region first.
(b) What would be the time difference between their arrival?
Just subtract one time from another:
Δt=t2−t1=7.72−5.49=2.23 s.
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