Abstract
At long periods, seismic waves generated by different earthquakes can be used to construct a single global image of Earth's response to seismic energy. This image (Figure 1) plots the expected ground motion at a point on Earth's surface as a function of time and distance to the earthquake. The various streaks on the plot represent different types of seismic waves, each of which travels at a different speed and arrives at a different time.Stacking—a process that averages and combines seismograms from a number of different source‐receiver locations—was used to create the image from thousands of individual records. The result is a direct view of the average wave field that can be used both as a teaching tool for illustrating the properties of the wave field and as a guide to further study.
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