Publication Date:
2011-04-30
Description:
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 ~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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vigny, C -- Socquet, A -- Peyrat, S -- Ruegg, J-C -- Metois, M -- Madariaga, R -- Morvan, S -- Lancieri, M -- Lacassin, R -- Campos, J -- Carrizo, D -- Bejar-Pizarro, M -- Barrientos, S -- Armijo, R -- Aranda, C -- Valderas-Bermejo, M-C -- Ortega, I -- Bondoux, F -- Baize, S -- Lyon-Caen, H -- Pavez, A -- Vilotte, J P -- Bevis, M -- Brooks, B -- Smalley, R -- Parra, H -- Baez, J-C -- Blanco, M -- Cimbaro, S -- Kendrick, E -- New York, N.Y. -- Science. 2011 Jun 17;332(6036):1417-21. doi: 10.1126/science.1204132. Epub 2011 Apr 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire de Geologie de l'Ecole Normale Superieure, UMR CNRS 8538, Paris, France. vigny@biotite.ens.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21527673" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
