Monthly GRACE detection of coseismic gravity change associated with 2011 Tohoku-Oki earthquake using northern gradient approach

Li, Jin; Shen, Wenbin

doi:10.1186/s40623-015-0188-0

Cited by 16 publications

(15 citation statements)

References 37 publications

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“…Most previous studies [e.g., Heki and Matsuo , ; Matsuo and Heki , ; Zhou et al ., ] additionally applied a decorrelation filter, an empirical data‐adaptive filter to suppress correlated errors among the GRACE coefficients, which produce north‐south stripes [ Swenson and Wahr , ]. However, the north‐south orientation of the Japan Trench may cause signal attenuation or distortion using a conventional decorrelation filter [e.g., Wang et al ., ; Li and Shen , ], so none is applied in this study. We remove the 3 year mean field from January 2008 to December 2010 from each monthly solution and then use a time series fitting method to retrieve coseismic signals (section 3.3).…”

Section: Methodsmentioning

confidence: 99%

Topographic effects on coseismic gravity change for the 2011 Tohoku‐Oki earthquake and comparison with GRACE

Chen

Wilson

2016

JGR Solid Earth

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We estimate gravity changes due to coseismic horizontal deformation and inclined bathymetry (referred to as topographic effects in this study) associated with the 2011 Tohoku‐Oki earthquake, using a layered half‐space dislocation model. As an approximation, we represent inclined topography with ramp‐body models in the near field of the earthquake and calculate topographic effects from both an inclined seafloor and Moho. The Moho effect partly compensates that from the seafloor. An additional contribution comes from seawater column variations as the sloped seafloor moves trenchward. Topographic effects are first‐order contributions to coseismic gravity changes for the 2011 Tohoku‐Oki earthquake. After 300 km Gaussian smoothing, comparable to the spatial resolution of the Gravity Recovery and Climate Experiment (GRACE), topographic effects create a dominantly negative gravity pattern with amplitudes up to 1.1 μGal for oceanic areas surrounding the epicenter. There are discrepancies between model predictions (−10.4 to +6.9 μGal) and GRACE observations (10.1 to +1.7 μGal). Errors in the adopted fault slip model and difficulties in separating coseismic and postseismic deformation may contribute to these, but topographic effects, currently neglected in dislocation models, are also responsible. Topographic effects ought to be included in coseismic fault slip and related gravity modeling for the 2011 Tohoku‐Oki earthquake and similar events in regions of steep topography.

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Section: Methodsmentioning

confidence: 99%

Topographic effects on coseismic gravity change for the 2011 Tohoku‐Oki earthquake and comparison with GRACE

Chen

Wilson

2016

JGR Solid Earth

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“…Generally, monthly gravity field models from GRACE before and after the earthquake were used to derive coseismic gravity or gravity gradient changes. Long-to-medium-wavelength coseismic and post-seismic gravity changes from large-scale earthquakes (e.g., the 2004 Sumatra-Andaman Mw = 9.1, 2010 Maule Mw = 8.8, 2011 Tohoku-Oki Mw = 9.0) have been adequately detected by the GRACE mission [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Wang et al [13] and Li and Shen [17] also determined the coseismic gravity gradient changes caused by the 2011 Japan Tohoku-Oki earthquake.…”

Section: Introductionmentioning

confidence: 99%

“…Long-to-medium-wavelength coseismic and post-seismic gravity changes from large-scale earthquakes (e.g., the 2004 Sumatra-Andaman Mw = 9.1, 2010 Maule Mw = 8.8, 2011 Tohoku-Oki Mw = 9.0) have been adequately detected by the GRACE mission [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Wang et al [13] and Li and Shen [17] also determined the coseismic gravity gradient changes caused by the 2011 Japan Tohoku-Oki earthquake. The GOCE mission has been proven successful for constructing regional geoid models combining with the EGM2008 and terrestrial gravity datasets [18,19], and can be used to study the lithospheric modeling, dynamic topography, and glacial isostatic adjustment [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

GOCE-Derived Coseismic Gravity Gradient Changes Caused by the 2011 Tohoku-Oki Earthquake

Ding

Zhao

et al. 2019

Remote Sensing

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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 (ΔVxx, ΔVyy, ΔVzz, and ΔVxz), we find analogous spatial patterns and a significant change (greater than 3σ) 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.

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“…Some Field quantities can better extract seismic signals other than geoid or gravity of the GRACE time-variable gravitational field. These other GRACE Field quantities include gravity gradients, vertical deflections, and gravitational gradient tensors (e.g., Li and Shen 2011;Sun and Zhou 2012;Wang et al 2012a;Li 2015;Die 2015), which are sensitive to small-scale signals. In this study we calculated a predicted total co-seismic gravity change of less than 1 which is consistent with Han et al (2016).…”

Section: Intruductionmentioning

confidence: 99%

“…−2πGρwΔh(x1, x2) where G denotes the Newton's gravitational constant, ρw = 1.03gcm−3 represents the sea water density and Δh(x1, x2) is the co-seismic vertical displacement) (e.g, Li and Shen 2011;Wang et al 2012;Li and Shen 2015).…”

Section: Model-predicted Gravity Changementioning

confidence: 99%

Co-Seismic Gravity Gradient Changes of the 2006–2007 Great Earthquakes in the Central Kuril Islands From Grace Observations

Rahimi

Shahrisvand

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:GRACE satellites (the Gravity Recovery And climate Experiment) are very useful sensors to extract gravity anomalies after earthquakes. In this study, we reveal co-seismic signals of the two combined earthquakes, the 2006 Mw8.3 thrust and 2007 Mw8.1 normal fault earthquakes of the central Kuril Islands from GRACE observations. We compute monthly full gravitational gradient tensor in the local north-east-down frame for Kuril Islands earthquakes without spatial averaging and de-striping filters. Some of gravitational gradient components (e.g. ΔVxx, ΔVxz) enhance high frequency components of the earth gravity field and reveal more details in spatial and temporal domain. Therefore, co-seismic activity can be better illustrated. For the first time, we show that the positive-negative-positive co-seismic ΔVxx due to the Kuril Islands earthquakes ranges from − 0.13 to + 0.11 milli Eötvös, and ΔVxz shows a positive-negative-positive pattern ranges from − 0.16 to + 0.13 milli Eötvös, agree well with seismic model predictions.

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Monthly GRACE detection of coseismic gravity change associated with 2011 Tohoku-Oki earthquake using northern gradient approach

Cited by 16 publications

References 37 publications

Topographic effects on coseismic gravity change for the 2011 Tohoku‐Oki earthquake and comparison with GRACE

Topographic effects on coseismic gravity change for the 2011 Tohoku‐Oki earthquake and comparison with GRACE

GOCE-Derived Coseismic Gravity Gradient Changes Caused by the 2011 Tohoku-Oki Earthquake

Co-Seismic Gravity Gradient Changes of the 2006–2007 Great Earthquakes in the Central Kuril Islands From Grace Observations

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