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Coseismic slip distribution of the February 27, 2010 Mw 8.8 Maule, Chile earthquake
Author(s) -
Pollitz Fred F.,
Brooks Ben,
Tong Xiaopeng,
Bevis Michael G.,
Foster James H.,
Bürgmann Roland,
Smalley Robert,
Vigny Christophe,
Socquet Anne,
Ruegg JeanClaude,
Campos Jaime,
Barrientos Sergio,
Parra Héctor,
Soto Juan Carlos Baez,
Cimbaro Sergio,
Blanco Mauro
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2011gl047065
Subject(s) - geology , seismology , epicenter , slip (aerodynamics) , seismic moment , geodesy , moment magnitude scale , interferometric synthetic aperture radar , geodetic datum , submarine pipeline , episodic tremor and slip , levelling , global positioning system , subduction , tectonics , synthetic aperture radar , geometry , remote sensing , physics , thermodynamics , telecommunications , fault (geology) , mathematics , geotechnical engineering , scaling , computer science
Static offsets produced by the February 27, 2010 M w = 8.8 Maule, Chile earthquake as measured by GPS and InSAR constrain coseismic slip along a section of the Andean megathrust of dimensions 650 km (in length) × 180 km (in width). GPS data have been collected from both campaign and continuous sites sampling both the near‐field and far field. ALOS/PALSAR data from several ascending and descending tracks constrain the near‐field crustal deformation. Inversions of the geodetic data for distributed slip on the megathrust reveal a pronounced slip maximum of order 15 m at ∼15–25 km depth on the megathrust offshore Lloca, indicating that seismic slip was greatest north of the epicenter of the bilaterally propagating rupture. A secondary slip maximum appears at depth ∼25 km on the megathrust just west of Concepción. Coseismic slip is negligible below 35 km depth. Estimates of the seismic moment based on different datasets and modeling approaches vary from 1.8 to 2.6 × 10 22 N m. Our study is the first to model the static displacement field using a layered spherical Earth model, allowing us to incorporate both near‐field and far‐field static displacements in a consistent manner. The obtained seismic moment of 1.97 × 10 22 N m, corresponding to a moment magnitude of 8.8, is similar to that obtained by previous seismic and geodetic inversions.