Thu Apr 10, F. Flechtner
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Tanaka, Y., Hasegawa, T., Tsuruoka, H., Klemann, V., and Martinec, Z., 2015. Spectral-finite element approach to post-seismic relaxation in a spherical compressible Earth: application to gravity changes due to the 2004 Sumatra-Andaman earthquake. Geophysical Journal International, 200(1):299–321, doi:10.1093/gji/ggu391.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2015GeoJI.200..299T,
author = {{Tanaka}, Y. and {Hasegawa}, T. and {Tsuruoka}, H. and {Klemann}, V. and {Martinec}, Z.},
title = "{Spectral-finite element approach to post-seismic relaxation in a spherical compressible Earth: application to gravity changes due to the 2004 Sumatra-Andaman earthquake}",
journal = {Geophysical Journal International},
keywords = {Satellite geodesy, Satellite gravity, Transient deformation, Time variable gravity, Subduction zone processes, Rheology: mantle},
year = 2015,
month = jan,
volume = {200},
number = {1},
pages = {299-321},
abstract = "{Global navigation satellite systems (GNSSs) have revealed that a mega-
thrust earthquake that occurs in an island-arc trench system
causes post-seismic crustal deformation. Such crustal
deformation data have been interpreted by combining three
mechanisms: afterslip, poroelastic rebound and viscoelastic
relaxation. It is seismologically important to determine the
contribution of each mechanism because it provides frictional
properties between the plate boundaries and viscosity estimates
in the asthenosphere which are necessary to evaluate the stress
behaviour during earthquake cycles. However, the observation
sites of GNSS are mostly deployed over land and can detect only
a small part of the large-scale deformation, which precludes a
clear separation of the mechanisms. To extend the spatial
coverage of the deformation area, recent studies started to use
satellite gravity data that can detect long-wavelength
deformations over the ocean. To date, compared with theoretical
models for calculating the post-seismic crustal deformation, a
few models have been proposed to interpret the corresponding
gravity variations. Previous approaches have adopted
approximations for the effects of compressibility, sphericity
and self-gravitation when computing gravity changes. In this
study, a new spectral-finite element approach is presented to
consider the effects of material compressibility for Burgers
viscoelastic earth model with a laterally heterogeneous
viscosity distribution. After the basic principles are
explained, it is applied to the 2004 Sumatra-Andaman earthquake.
For this event, post-seismic deformation mechanisms are still a
controversial topic. Using the developed approach, it is shown
that the spatial patterns of gravity change generated by the
above three mechanisms clearly differ from one another. A
comparison of the theoretical simulation results with the
satellite gravity data obtained from the Gravity Recovery and
Climate Experiment reveals that both afterslip and viscoelastic
relaxation are occurring. Considering the spatial patterns in
satellite gravity fields is an effective method for
investigating post-seismic deformation mechanisms.}",
doi = {10.1093/gji/ggu391},
adsurl = {https://ui.adsabs.harvard.edu/abs/2015GeoJI.200..299T},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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