Thu Aug 14, F. Flechtner
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Xu, Xinyu, Ding, Hao, Zhao, Yongqi, Li, Jin, and Hu, Minzhang, 2019. GOCE-Derived Coseismic Gravity Gradient Changes Caused by the 2011 Tohoku-Oki Earthquake. Remote Sensing, 11(11):1295, doi:10.3390/rs11111295.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2019RemS...11.1295X,
author = {{Xu}, Xinyu and {Ding}, Hao and {Zhao}, Yongqi and {Li}, Jin and {Hu}, Minzhang},
title = "{GOCE-Derived Coseismic Gravity Gradient Changes Caused by the 2011 Tohoku-Oki Earthquake}",
journal = {Remote Sensing},
keywords = {coseismic gravity gradient changes, gravity field model, GOCE, GRACE},
year = 2019,
month = may,
volume = {11},
number = {11},
eid = {1295},
pages = {1295},
abstract = "{In contrast to most of the coseismic gravity change studies, which are
generally based on data from the Gravity field Recovery and
Climate Experiment (GRACE) satellite mission, we use
observations from the Gravity field and steady-state Ocean
Circulation Explorer (GOCE) Satellite Gravity Gradient (SGG)
mission to estimate the coseismic gravity and gravity gradient
changes caused by the 2011 Tohoku-Oki Mw 9.0 earthquake. We
first construct two global gravity field models up to degree and
order 220, before and after the earthquake, based on the least-
squares method, with a bandpass Auto Regression Moving Average
(ARMA) filter applied to the SGG data along the orbit. In
addition, to reduce the influences of colored noise in the SGG
data and the polar gap problem on the recovered model, we
propose a tailored spherical harmonic (TSH) approach, which only
uses the spherical harmonic (SH) coefficients with the degree
range 30-95 to compute the coseismic gravity changes in the
spatial domain. Then, both the results from the GOCE
observations and the GRACE temporal gravity field models (with
the same TSH degrees and orders) are simultaneously compared
with the forward-modeled signals that are estimated based on the
fault slip model of the earthquake event. Although there are
considerable misfits between GOCE-derived and modeled gravity
gradient changes ({\ensuremath{\Delta}}V$_{xx}$,
{\ensuremath{\Delta}}V$_{yy}$, {\ensuremath{\Delta}}V$_{zz}$,
and {\ensuremath{\Delta}}V$_{xz}$), we find analogous spatial
patterns and a significant change (greater than
3{\ensuremath{\sigma}}) in gravity gradients before and after
the earthquake. Moreover, we estimate the radial gravity
gradient changes from the GOCE-derived monthly time-variable
gravity field models before and after the earthquake, whose
amplitudes are at a level over three times that of their
corresponding uncertainties, and are thus significant.
Additionally, the results show that the recovered coseismic
gravity signals in the west-to-east direction from GOCE are
closer to the modeled signals than those from GRACE in the TSH
degree range 30-95. This indicates that the GOCE-derived gravity
models might be used as additional observations to infer/explain
some time-variable geophysical signals of interest.}",
doi = {10.3390/rs11111295},
adsurl = {https://ui.adsabs.harvard.edu/abs/2019RemS...11.1295X},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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