Abstract
STRESS changes caused by fault movement in an earthquake induce transient aseismic crustal movements in the earthquake source region that continue for months to decades following large events1–4. These motions reflect aseismic adjustments of the fault zone and/or bulk deformation of the surroundings in response to applied stresses2,5–7, and supply information regarding the inelastic behaviour of the Earth's crust. These processes are imperfectly understood because it is difficult to infer what occurs at depth using only surface measurements2, which are in general poorly sampled. Here we push satellite radar interferometry to near its typical artefact level, to obtain a map of the postseismic deformation field in the three years following the 28 June 1992 Landers, California earthquake. From the map, we deduce two distinct types of deformation: afterslip at depth on the fault that ruptured in the earthquake, and shortening normal to the fault zone. The latter movement may reflect the closure of dilatant cracks and fluid expulsion from a transiently over-pressured fault zone6–8.
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Massonnet, D., Thatcher, W. & Vadon, H. Detection of postseismic fault-zone collapse following the Landers earthquake. Nature 382, 612–616 (1996). https://doi.org/10.1038/382612a0
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DOI: https://doi.org/10.1038/382612a0
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