Scientists urged residents of northern Nevada's largest city to prepare for a bigger event as the area continued rumbling Saturday after the largest earthquake in a two-month-long series of temblors.

More than 100 aftershocks were recorded on the western edge of the city after a magnitude-4.7 quake hit Friday night, the strongest quake around Reno since one measuring 5.2 in 1953, said researchers at the seismological laboratory at the University of Nevada, Reno.