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Satellite gravimetry has proven to be a useful tool to identify mass anomalies along a subduction interface, interpreted as heterogeneities related to the rupture process during megathrust earthquakes. In the last years, different works, reinforced with data derived from satellite gravity missions as GRACE and now GOCE, have analyzed not only the static component of the Earth gravity field, but also its temporal variations and relation to the seismic cycle. In particular, during the last decade, the Chilean margin has been affected by three megathrust earthquakes (with Mw >8): Maule 2010 Mw = 8.8, Pisagua 2014 Mw = 8.2 and recently the Mw = 8.3 Illapel event. Then, the recently completed GOCE mission (November 2009 to November 2013) offered a unique opportunity to study the Maule February 2010 and Pisagua April 2014 events by means of gravity gradients, directly measured at satellite height altitudes, which allowed mapping density heterogeneities with greater detail than the gravity anomaly which has been used in most studies up to now. In the present work, we use the last GOCE model (GO_CONS_GCF_2_DIR_R5), the one of higher spatial resolution (N = 300, λ/2 ≈ 66 km) derived from satellite-only data. The methodology used is the same as that to study the previous events, with the addition that now we derived a relation between the associated depths of a causative mass with a determined degree of the spherical harmonic expansion. This allowed to “decompose” the gravimetric signal, by cutting off the degree/order of the harmonic expansion, as depth increases. From this analysis, we found that prominent oceanic features such as the Challenger fracture zone and the Juan Fernandez ridge played a key role in latitudinal seismic segmentation for the Illapel earthquake rupture zone, acting as barriers/attenuators to the seismic energy release. We compared the slip model from Tilmann et al. (Geophysical Research Letters 43: 574–583. doi:10.1002/2015GL066963, 2016) for the Illapel earthquake with vertical gravity gradient with and without sediment correction, and at different degree/order of the harmonic expansion. From this analysis, we inferred that prominent oceanic features over the subducting Nazca plate play a key role in seismic segmentation not only at heavily sedimented trenches, but also at sediment-starved segments. © 2016, Springer International Publishing.


Documento: Artículo
Título:Analysis of the Illapel Mw = 8.3 Thrust Earthquake Rupture Zone Using GOCE-Derived Gradients
Autor:Álvarez, O.; Pesce, A.; Gimenez, M.; Folguera, A.; Soler, S.; Chen, W.
Filiación:Instituto Geofísico Sismológico Ing. F.S. Volponi, Universidad Nacional de San Juan, Ruta 12, Km 17, Jardín de los Poetas, Marquesado, Rivadavia, San Juan, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Departamento de Cs, Geológicas, INDEAN, Instituto de Estudios Andinos “Don Pablo Groeber”, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina
Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario, Rosario, Argentina
School of Geodesy and Geomatics, Institute of Geodesy and Geophysics, Wuhan, China
Department of Mathematics and Geosciences, University of Trieste, Trieste, Italy
Palabras clave:GOCE; Megathrust earthquakes; South central Andes; Spherical harmonics; Vertical gravity gradient; Geodetic satellites; Geophysics; Harmonic analysis; Satellites; Seismology; Tectonics; Central Andes; GOCE; Gravity gradients; Megathrust earthquakes; Spherical harmonics; Earthquakes; earthquake magnitude; earthquake rupture; GOCE; GRACE; gravity field; mapping; satellite data; satellite mission; Andes
Página de inicio:47
Página de fin:75
Título revista:Pure and Applied Geophysics
Título revista abreviado:Pure Appl. Geophys.


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---------- APA ----------
Álvarez, O., Pesce, A., Gimenez, M., Folguera, A., Soler, S. & Chen, W. (2017) . Analysis of the Illapel Mw = 8.3 Thrust Earthquake Rupture Zone Using GOCE-Derived Gradients. Pure and Applied Geophysics, 174(1), 47-75.
---------- CHICAGO ----------
Álvarez, O., Pesce, A., Gimenez, M., Folguera, A., Soler, S., Chen, W. "Analysis of the Illapel Mw = 8.3 Thrust Earthquake Rupture Zone Using GOCE-Derived Gradients" . Pure and Applied Geophysics 174, no. 1 (2017) : 47-75.
---------- MLA ----------
Álvarez, O., Pesce, A., Gimenez, M., Folguera, A., Soler, S., Chen, W. "Analysis of the Illapel Mw = 8.3 Thrust Earthquake Rupture Zone Using GOCE-Derived Gradients" . Pure and Applied Geophysics, vol. 174, no. 1, 2017, pp. 47-75.
---------- VANCOUVER ----------
Álvarez, O., Pesce, A., Gimenez, M., Folguera, A., Soler, S., Chen, W. Analysis of the Illapel Mw = 8.3 Thrust Earthquake Rupture Zone Using GOCE-Derived Gradients. Pure Appl. Geophys. 2017;174(1):47-75.