TY  - JOUR
A1  - Moreno, Marcelo Spegiorin
A1  - Melnick, Daniel
A1  - Rosenau, M.
A1  - Báez, Juan Carlos
A1  - Klotz, Jan
A1  - Oncken, Onno
A1  - Tassara, Andres
A1  - Chen, J.
A1  - Bataille, Klaus
A1  - Bevis, M.
A1  - Socquet, Anne
A1  - Bolte, John
A1  - Vigny, C.
A1  - Brooks, B.
A1  - Ryder, I.
A1  - Grund, Volker
A1  - Smalley, B.
A1  - Carrizo, Daniel
A1  - Bartsch, M.
A1  - Hase, H.
T1  - Toward understanding tectonic control on the M-w 8.8 2010 Maule Chile earthquake
JF  - Earth & planetary science letters
N2  - The Maule earthquake of 27th February 2010 (M-w = 8.8) affected similar to 500 km of the Nazca-South America plate boundary in south-central Chile producing spectacular crustal deformation. Here, we present a detailed estimate of static coseismic surface offsets as measured by survey and continuous GPS, both in near- and far-field regions. Earthquake slip along the megathrust has been inferred from a Joint inversion of our new data together with published GPS, InSAR, and land-level changes data using Green's functions generated by a spherical finite-element model with realistic subduction zone geometry. The combination of the data sets provided a good resolution, indicating that most of the slip was well resolved. Coseismic slip was concentrated north of the epicenter with up to 16 m of slip, whereas to the south it reached over 10 m within two minor patches. A comparison of coseismic slip with the slip deficit accumulated since the last great earthquake in 1835 suggests that the 2010 event closed a mature seismic gap. Slip deficit distribution shows an apparent local overshoot that highlight cycle-to-cycle variability, which has to be taken into account when anticipating future events from interseismic observations. Rupture propagation was obviously not affected by bathymetric features of the incoming plate. Instead, splay faults in the upper plate seem to have limited rupture propagation in the updip and along-strike directions. Additionally, we found that along-strike gradients in slip are spatially correlated with geometrical inflections of the megathrust. Our study suggests that persistent tectonic features may control strain accumulation and release along subduction megathrusts.
KW  - GPS
KW  - Chile
KW  - Maule
KW  - slip model
KW  - FEM
Y1  - 2012
U6  - https://doi.org/10.1016/j.epsl.2012.01.006
SN  - 0012-821X
VL  - 321
IS  - 3
SP  - 152
EP  - 165
PB  - Elsevier
CY  - Amsterdam
ER  -