Geodetic observations of the M 5.1 January 29, 1994 Northridge aftershock

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Abstract
Geodetic observations of the January 29, 1994 M 5.1 aftershock of the Northridge earthquake are consistent with seismic solutions showing left‐lateral oblique slip on a northeast striking steeply dipping fault. Thirty second solutions of the data from the station showing the maximum observed displacement (35 mm) indicate neither precursory nor immediate post‐seismic motion to the aftershock. The aftershock does appear to be superimposed over the longer term Northridge post‐seismic deformation field. Inversions of the data yield a potency of 2.6 ± 0.3 × 10−3km³ slightly higher than that determined by seismic methods. Combining the potency with estimates of rigidity from P‐ and S‐wave velocities yields a moment that is consistent with seismic moment solutions.