TY  - JOUR
A1  - Socquet, Anne
A1  - Valdes, Jesus Pina
A1  - Jara, Jorge
A1  - Cotton, Fabrice Pierre
A1  - Walpersdorf, Andrea
A1  - Cotte, Nathalie
A1  - von Specht, Sebastian
A1  - Ortega-Culaciati, Francisco
A1  - Carrizo, Daniel
A1  - Norabuena, Edmundo
T1  - An 8month slow slip event triggers progressive nucleation of the 2014 Chile megathrust
JF  - Geophysical research letters
N2  - The mechanisms leading to large earthquakes are poorly understood and documented. Here we characterize the long-term precursory phase of the 1 April 2014 M(w)8.1 North Chile megathrust. We show that a group of coastal GPS stations accelerated westward 8months before the main shock, corresponding to a M(w)6.5 slow slip event on the subduction interface, 80% of which was aseismic. Concurrent interface foreshocks underwent a diminution of their radiation at high frequency, as shown by the temporal evolution of Fourier spectra and residuals with respect to ground motions predicted by recent subduction models. Such ground motions change suggests that in response to the slow sliding of the subduction interface, seismic ruptures are progressively becoming smoother and/or slower. The gradual propagation of seismic ruptures beyond seismic asperities into surrounding metastable areas could explain these observations and might be the precursory mechanism eventually leading to the main shock.
KW  - seismology
KW  - GPS
KW  - subduction
KW  - precursor
Y1  - 2017
U6  - https://doi.org/10.1002/2017GL073023
SN  - 0094-8276
SN  - 1944-8007
VL  - 44
SP  - 4046
EP  - 4053
PB  - American Geophysical Union
CY  - Washington
ER  - 
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  - 
TY  - JOUR
A1  - Schulze-Makuch, Dirk
A1  - Wagner, Dirk
A1  - Kounaves, Samuel P.
A1  - Mangelsdorf, Kai
A1  - Devine, Kevin G.
A1  - de Vera, Jean-Pierre
A1  - Schmitt-Kopplin, Philippe
A1  - Grossart, Hans-Peter
A1  - Parro, Victor
A1  - Kaupenjohann, Martin
A1  - Galy, Albert
A1  - Schneider, Beate
A1  - Airo, Alessandro
A1  - Froesler, Jan
A1  - Davila, Alfonso F.
A1  - Arens, Felix L.
A1  - Caceres, Luis
A1  - Cornejo, Francisco Solis
A1  - Carrizo, Daniel
A1  - Dartnell, Lewis
A1  - DiRuggiero, Jocelyne
A1  - Flury, Markus
A1  - Ganzert, Lars
A1  - Gessner, Mark O.
A1  - Grathwohl, Peter
A1  - Guan, Lisa
A1  - Heinz, Jacob
A1  - Hess, Matthias
A1  - Keppler, Frank
A1  - Maus, Deborah
A1  - McKay, Christopher P.
A1  - Meckenstock, Rainer U.
A1  - Montgomery, Wren
A1  - Oberlin, Elizabeth A.
A1  - Probst, Alexander J.
A1  - Saenz, Johan S.
A1  - Sattler, Tobias
A1  - Schirmack, Janosch
A1  - Sephton, Mark A.
A1  - Schloter, Michael
A1  - Uhl, Jenny
A1  - Valenzuela, Bernardita
A1  - Vestergaard, Gisle
A1  - Woermer, Lars
A1  - Zamorano, Pedro
T1  - Transitory microbial habitat in the hyperarid Atacama Desert
JF  - Proceedings of the National Academy of Sciences of the United States of America
KW  - habitat
KW  - aridity
KW  - microbial activity
KW  - biomarker
KW  - Mars
Y1  - 2018
U6  - https://doi.org/10.1073/pnas.1714341115
SN  - 0027-8424
VL  - 115
IS  - 11
SP  - 2670
EP  - 2675
PB  - National Acad. of Sciences
CY  - Washington
ER  -