Articles | Volume 13, issue 1
Research article
12 Jan 2022
Research article |  | 12 Jan 2022

Forearc density structure of the overriding plate in the northern area of the giant 1960 Valdivia earthquake

Andrei Maksymowicz, Daniela Montecinos-Cuadros, Daniel Díaz, María José Segovia, and Tomás Reyes

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Cited articles

Adriasola, A. C., Thomson, S. N., and Brix, M. R.: Postmagmatic cooling and late Cenozoic denudation of the North Patagonian Batholith in the Los Lagos region of Chile, 41-4215S, Int. J. Earth. Sci. (Geol Rundsch), 95, 504–528,, 2005. 
Álvarez, O., Nacif, S., Gimenesz, M., Folguera, A., and Braitenberg, C.: Goce derived vertical gravity gradient delineates great earthquake rupture zones along the chilean margin, Tectonophysics, 622, 198–215,, 2014. 
Bangs, N. and Cande, S.: Episodic development of a convergent margin inferred from structures and processes along the southern Chile margin, Tectonics, 16, 489–503, 1997. 
Bangs, N., Morgan, J. K., Tréhu, A. M., Contreras-Reyes, E., Arnul, A., Han, S., Olsen, K. M., and Zhang, E.: Basal accretion along the south-central Chilean margin and its relationship to great earthquakes, J. Geophys. Res., 125, 1–21,, 2020. 
Bassett, D. and Watts, A. B.: Gravity anomalies, crustal structure, and seismicity at subduction zones: 2. Interrelationships between fore-arc structure and seismogenic behavior, Geochem. Geophy. Geosy., 16, 1541–1576,, 2015. 
Short summary
This work analyses the density structure of the continental forearc in the northern segment of the 1960 Mw 9.6 Valdivia earthquake. Results show a segmentation of the continental wedge along and perpendicular to the margin. The extension of the less rigid basement units conforming the marine wedge and Coastal Cordillera domain could modify the process of stress loading during the interseismic periods. This analysis highlights the role of the overriding plate on the seismotectonic process.