56. Earthquake The graph shows the vertical acceleration of the ground from the 1994 Northridge earthquake in Los Angeles, as measured by a seismograph. (Here 1 represents the time in seconds.) (a) At what time t did the earthquake first make noticeable movements of the earth? (b) At what time 1 did the earthquake seem to end? (c) At what time t was the maximum intensity of the earth- quake reached? (cm/s?) 100 50 S 507 (s) -50- Source: California Department of Mines and Geology

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