Abstract
It is well known that the quality of gravity modelling of the Earth’s lithosphere is heavily dependent on the limited number of available terrestrial gravity data. More recently, however, interest has grown within the geoscientific community to utilise the homogeneously measured satellite gravity and gravity gradient data for lithospheric scale modelling. Here, we present an interdisciplinary approach to determine the state of stress and rate of deformation in the Central Andean subduction system. We employed gravity data from terrestrial, satellite-based and combined sources using multiple methods to constrain stress, strain and gravitational potential energy (GPE). Well-constrained 3D density models, which were partly optimised using the combined regional gravity model IMOSAGA01C (Hosse et al. in Surv Geophys, 2014, this issue), were used as bases for the computation of stress anomalies on the top of the subducting oceanic Nazca plate and GPE relative to the base of the lithosphere. The geometries and physical parameters of the 3D density models were used for the computation of stresses and uplift rates in the dynamic modelling. The stress distributions, as derived from the static and dynamic modelling, reveal distinct positive anomalies of up to 80 MPa along the coastal Jurassic batholith belt. The anomalies correlate well with major seismicity in the shallow parts of the subduction system. Moreover, the pattern of stress distributions in the Andean convergent zone varies both along the north–south and west–east directions, suggesting that the continental fore-arc is highly segmented. Estimates of GPE show that the high Central Andes might be in a state of horizontal deviatoric tension. Models of gravity gradients from the Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite mission were used to compute Bouguer-like gradient anomalies at 8 km above sea level. The analysis suggests that data from GOCE add significant value to the interpretation of lithospheric structures, given that the appropriate topographic correction is applied.
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Acknowledgments
This work has been financed by the German Research Council (DFG) in the priority programme SPP1257 ‘Mass transport and mass distribution’ (GO 380/27-2, JE 107/57-2, PA 1543/2-2). We acknowledge the valuable comments provided by the two anonymous reviewers and guest editor Volker Klemann. We thank our project partners at TU München, Roland Pail, Michael Hosse and Martin Horwath, for fruitful discussions and for providing geopotential models. We thank Rekha Sharma for her contribution to the initial manuscript. We used GMT (Wessel and Smith 1991) for many of the figures.
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Gutknecht, B.D., Götze, HJ., Jahr, T. et al. Structure and State of Stress of the Chilean Subduction Zone from Terrestrial and Satellite-Derived Gravity and Gravity Gradient Data. Surv Geophys 35, 1417–1440 (2014). https://doi.org/10.1007/s10712-014-9296-9
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DOI: https://doi.org/10.1007/s10712-014-9296-9