Mon Oct 13, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Wang, Changyu, Wang, Qiuyu, Xu, Huan, Rao, Weilong, Sun, Pengchao, Yi, Shuang, Sun, Wenke, and Wei, Dongping, 2025. Investigating Moho Depth Variations Beneath the South American Continent Using Geodetic Constraints. Geophysical Journal International, .
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025GeoJI.tmp..381W,
author = {{Wang}, Changyu and {Wang}, Qiuyu and {Xu}, Huan and {Rao}, Weilong and {Sun}, Pengchao and {Yi}, Shuang and {Sun}, Wenke and {Wei}, Dongping},
title = "{Investigating Moho Depth Variations Beneath the South American Continent Using Geodetic Constraints}",
journal = {Geophysical Journal International},
year = 2025,
month = sep,
abstract = "{The South American continent (SAC), a region of pronounced geodynamic
and hydrological activity, exhibits crustal deformation and
gravity field anomalies driven by the interplay of tectonic
forces and surface/subsurface mass redistribution. While
previous studies have mainly focused on gravity changes driven
by terrestrial water storage (TWS), mass variations of the solid
Earth remain inadequately addressed. In this study, we resolve
deep-seated mass transport Gravity Recovery and Climate
Experiment (GRACE) satellite gravimetry, hydrological model
outputs, GPS-derived vertical crustal motions, and glacial
isostatic adjustment (GIA) correction. Our results reveal an
internal mass variation of 0.21 {\ensuremath{\pm}} 0.45 cm yr
$^{-1}$ in equivalent water height (EWH), independent of surface
hydrological contributions. Interpreting this signal as
predominantly driven by crust-mantle boundary (Moho)
displacements, we estimate an average Moho depth uplift rate of
0.37 {\ensuremath{\pm}} 0.80 cm yr $^{-1}$ across SAC, based on
the crust-mantle density contrast. The Moho interface depth
variations exhibit significant spatial heterogeneity. Through
uncertainty analysis, four distinct regions (A, B, C, and D) are
identified: Region A exhibits Moho uplift and Region B exhibits
subsidence, with part contributions from the isostatic
adjustment. Key uncertainties in these estimates stem from
sedimentation effects and the accuracy of current observations
or models. Subsidence in Region C and uplift in Region D are
related to the co-seismic and post-seismic effects of the 2010
Chile earthquake. These findings underscore the significance of
solid Earth mass flux in active continental regions and unravel
the mechanisms governing crust-Moho mass redistribution.}",
doi = {10.1093/gji/ggaf374},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025GeoJI.tmp..381W},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Mon Oct 13, F. Flechtner