 This requires accommodation of 34 to 48 millimeters (about one and a half inches) of slippage per year, with some of that taken up in portions of the Basin and Range Province to the east of California.This slippage is accommodated by ruptures (earthquakes) and aseismic creep on the various faults, with the frequency of ruptures dependent (in part) on how the slippage is distributed across the various faults.Like its predecessor, UCERF3 determines this based on four layers of modeling