The 2010 M(w) 8.8 Maule Megathrust Earthquake of Central Chile, Monitored by GPS | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  The 2010 M(w) 8.8 Maule Megathrust Earthquake of Central Chile, Monitored by GPS

Type de publication:

Journal Article

Source:

Science, Volume 332, Ticket 6036, p.1417-1421 (2011)

ISBN:

0036-8075

Numéro d'accès:

WOS:000291689000038

URL:

http://www.sciencemag.org/content/332/6036/1417

Mots-clés:

UMR 7154 ; Tectonique et mécanique de la lithosphère

Résumé:

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.

Notes:

Times Cited: 2