Abstract
Large earthquakes produce crustal deformation that can be quantified
by geodetic measurements, allowing for the determination of the slip
distribution on the fault. We used data from Global Positioning System
(GPS) networks in Central Chile to infer the static deformation and
the kinematics of the 2010 moment magnitude (Mw) 8.8 Maule megathrust
earthquake. From elastic modeling, we found a total rupture length
of \~500 kilometers where slip (up to 15 meters) concentrated on
two main asperities situated on both sides of the epicenter. We found
that rupture reached shallow depths, probably extending up to the
trench. Resolvable afterslip occurred in regions of low coseismic
slip. The low-frequency hypocenter is relocated 40 kilometers southwest
of initial estimates. Rupture propagated bilaterally at about 3.1
kilometers per second, with possible but not fully resolved velocity
variations.
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