9The strength of rocks in the subsurface is critically important across the geosciences, with 10 implications for fluid flow, mineralization, seismicity, and the deep biosphere. Most studies 11of porous rock strength consider the scalar quantity of porosity, in which strength shows a 12 broadly inverse relationship with total porosity, but pore shape is not explicitly defined. Here

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[1] Using 3D terrestrial laser scan (TLS) technology, we have recorded postseismic deformation on and adjacent to the surface rupture formed during the 6th April 2009 L'Aquila normal faulting earthquake (Mw 6.3). Using surface modeling techniques and repeated surveys 8-124 days after the earthquake, we have produced a 4D dataset of postseismic deformation across a 3 × 65 m area at high horizontal spatial resolution. We detected millimetrescale movements partitioned between discrete surface rupture slip and development of a hangingwall syncline over 10's of meters. We interpret the results as the signal of shallow afterslip in the fault zone. We find 52% of the total postseismic hangingwall vertical motion occurs as deformation within 30 m of the surface rupture. The total postseismic vertical motions are approximately 50% that of the coseismic. We highlight the importance of quantifying partitioned postseismic contributions when applying empirical slip-magnitude datasets to infer palaeoearthquake magnitudes.