Discussion
Travel time curves are graphs of
Answer: A
Correct answer: arrival time plotted against epicentral distance
Travel time curves plot the arrival time of each phase against distance from the epicentre, built up from many recorded earthquakes. They are the working tool for identifying phases on a seismogram and for estimating distance, and their shape is what reveals the earth’s internal velocity structure - the breaks and shadow zones in them are the evidence for the Moho, the mantle transition zones and the core.
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