To estimate: The range of the vertical ground acceleration functions at USC during the Northridge earthquake.
The range of the vertical ground acceleration function is .
The graph which was recorded by an instrument operated by the California Department of Mines and Geology at the University Hospital of the University of Southern California in Los Angeles is shown below in Figure 1.
In Figure 1, the x-axis represents time in seconds and the y-axis represents the vertical ground acceleration during the Northridge earthquake in cm/s2.
It is observed from Figure 1 that the minimum point occurs at (12, −85) and the maximum point occurs at (17, 115).
Since, the range is the set of all y-values of the graph, the range of the vertical ground acceleration function is estimated to . Thus, the range of the vertical ground acceleration is [−85, 115].
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