Journal
SCIENCE
Volume 332, Issue 6036, Pages 1417-1421Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1204132
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Funding
- French Institut National des Sciences de l'Univers
- Institut pour la Recherche et le Developpment
- Agence Nationale pour la Recherche
- Ministere des Affaires Etrangeres
- Directorate For Geosciences
- Division Of Earth Sciences [1118514] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1036065, 1036252] Funding Source: National Science Foundation
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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 (M-w) 8.8 Maule megathrust earthquake. From elastic modeling, we found a total rupture length of similar to 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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