Coseismic and postseismic deformation of the 2011 Tohoku‐Oki earthquake constrained by GRACE gravimetry

Wang, Lei; Shum, C. K.; Simons, Frederik J.; Tapley, Byron D; Dai, Chunli

doi:10.1029/2012gl051104

Cited by 73 publications

(80 citation statements)

References 39 publications

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“…Coseismic gravity changes of very large earthquakes have been detected by Gravity Recovery and Climate Experiment (GRACE) since its launch in 2002, including the 2004 M w = 9.1 Sumatra-Andaman earthquake (e.g., Han et al 2006;Chen et al 2007), 2010 M w = 8.8 Maule (Central Chile) earthquake (e.g., Han et al 2010;Heki and Matsuo 2010), 2011 M w = 9.0 Tohoku-Oki earthquake (e.g., Matsuo and Heki 2011;Han et al 2011;Wang et al 2012a;Zhou et al 2012;Sabadini 2012, 2013;Dai et al 2014), and the 2012 M w = 8.6 Wharton basin earthquake off-Sumatra (Han et al 2013). Attributing to the wide availability of various seismologic and geodetic observations for the Japan areas, the slips associated with 2011 Tohoku-Oki earthquake have been well constrained, using seismic wave data (e.g., Hayes 2011;Shao et al 2011;Suzuki et al 2012), land global positioning system (GPS) and seafloor bathymetry data (e.g., Chang and Chao 2011;Ito et al 2011;Suito et al 2011;Sato et al 2011;Sleep 2012), InSAR data (e.g., Kobayashi et al 2011), etc.…”

Section: Introductionmentioning

confidence: 99%

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

Shen

2015

Earth, Planets and Space

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We demonstrate that the coseismic gravitational changes due to the 2011 M w = 9.0 Tohoku-Oki earthquake are detectable by GRACE with only 1-month data after the earthquake, which is also supported by a simulation test using the seismic-signal-contained observations synthesized with the signals of a dislocation model prediction. The commonly used destriping to filter correlated errors in GRACE coefficients tends to distort the true coseismic signals in both amplitude and spatial pattern. In order to better retrieve coseismic gravitational signals, we apply a northern gravity gradient approach with the filter of spatial averaging and without destriping. The coseismic northern gravity gradient changes of Tohoku-Oki earthquake are extracted from the monthly data of April 2011, which reveal a positive-negative-positive spatial pattern and agree with the model prediction. The northern gradient approach provides an efficient means to detect coseismic signals and potentially constrain fault slip models with large-scale gravitational changes using limited time span of monthly GRACE solutions.

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Section: Introductionmentioning

confidence: 99%

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

Shen

2015

Earth, Planets and Space

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“…43). По данным спутниковой миссии GRACE (Gravity Recovery and Climate Experiment), из-менения в поле силы тяжести произошли во время землетрясения и в первые месяцы после него [Wang et al, 2012] (рис. 44) и выразились, наоборот, в опуска-нии юго-восточной части островной дуги о. Хонсю и поднятии северо-западного борта желоба.…”

Section: особенности кинематики зоны субдукции свидетельствующие о рunclassified

“…Изменение поля силы тяжести во время Японского землетрясения 2011 г. [Wang et al, 2012]. Синим показано уменьшение, красным -увеличение.…”

Section: особенности кинематики зоны субдукции свидетельствующие о рunclassified

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Seismic nails in various geodynamic conditions

Захаров

Карпенко

Zav’yalov

2013

Moscow Univ. Geol. Bull.

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An earthquake source is characterized by two nodal planes oriented parallel to two planes of maximum shear stresses ( Fig. 1, left). A rapid displacement of the shear type (in mechanical, rather than in the geological meaning) occurs along one of the planes and causes an earthquake.The concept of plate tectonics with one of its main components, subduction zones, provides, at first sight, the unique opportunity to select one of the two nodal planes -a gently dipping plane which is parallel to the roof of the subducting oceanic plate (Fig. 1, bottom right). The other nodal plane that is steeply dipping in the opposite direction (Fig. 1, top right) seems 'unpromising', considering the aspect of seismicity, for two reasons. First, displacement along this plate is contrary to the general direction of oceanic plate subduction. Secondly, such displacement is directed against the direction of gravity, which is energetically disadvantageous.However, it should be taken into account that in the stress field of the subduction zone, as in any stress field, the two above-mentioned maximum shear stresses have equal values. At the same time, it is the sub-vertical displacement that excites rapid uplifting of the seabed which causes a tsunami. Researchers who support the traditional choice of a gently dipping nodal plane have to reckon with it and therefore create complex models, such as the 'splay fault' model that seem most successful, though being quite complicated and controversial (Figs. 56 and 57).In our opinion, the geological reality is more adequately refelected by the geological and geophysical model shown in Fig. 1 (right). It is based on the wide range of information and assumes that both nodal planes are equivalent and interchange in generation of strong earthquakes.The aim of this article is to consider this model in terms of tectonophysics. For this purpose, earthquake sources indicated on (Fig. 1, right) are classified as Riedel megashears, R (bottom right) and R' (top right top), which occur in the geodynamic setting of sub-horizontal shearing (in this case, subduction of the oceanic plate) along the sub-horizontal plane (Fig. 3). This situation is one of five elementary geodynamic settings (see Fig. 2). It is similar in everything, except the position of the shearing plane, with the geodynamic setting of horizontal shearing along the vertical plane (Fig. 4). Riedel shears formed in the latter situation were subject to the most detailed studies using purpose-made devices (Fig. 5, and 6). This study gave grounds to conclude that Riedel shears, R are developed much better than shears R'.Our experiments (Fig. 7) confirm the above conclsuion. Moreover, it is revealed that shears R', that develop poorly in samples made of wet clay (Figs. 8, 9, 12, and 13), cannot develop in a granulated medium such as a mixture of sand and solid oil (Fig. 10, 11, and 14) and do not develop in other granulated media (Fig. 17), which are similar to the block structure of the uppermost crust (Fig. 18-20). In such mediums, shea...

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“…Slepian functions (Slepian 1983) have been used for modeling noisy regional potential fields over an incomplete portion of the globe (Simons and Dahlen 2006), and to study gravity (e.g., Han and Simons 2008;Han 2008;Wang et al 2012) and magnetic (e.g., Beggan et al 2013;Plattner and Simons 2015) fields. However, the joint inversion of near-surface and satellite altitude magnetic observations relies on relatively standard least squares weighting procedures (e.g., Ravat et al 2002;Menke 2012).…”

Section: Modeling Multi-altitude Data With Spherical Slepian Functionsmentioning

confidence: 99%

Utility of Slepian basis functions for modeling near-surface and satellite magnetic anomalies of the Australian lithosphere

Kim

Frese

2017

Earth Planets Space

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The utility of frequency-and space-limited spherical harmonic Slepian basis functions for magnetic anomaly modeling over restricted spherical patches of the Earth was investigated using combined near-surface scalar and CHAMP satellite vector observations from Australia and adjacent marine areas. In particular, Slepian spherical harmonic models up to degree 360 were studied for modeling anomaly features of 1° (~111 km) and longer over a 25°-radius cap centered on Australia. Relative to the roughly 130,000 coefficients required for global spherical harmonic modeling, less than 5% of this number of coefficients is sufficient for effective localized Slepian modeling. Slepian coefficients have maximum power over the spherical cap and may be exploited for estimating the magnetic anomaly vectors and gradients to all orders within the working precision of the observations. The Earth cap modeled by Slepian coefficients is also more efficient in accommodating local crustal constraints from drilling and other geological and geophysical studies for interpreting the associated magnetic anomaly data registered in spherical coordinates. In general, Slepian spherical harmonic modeling is well suited for combining spectrally diverse compilations of near-surface and satellite magnetic observations over any spatially restricted spherical cap of the Earth or other planetary body.

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Coseismic and postseismic deformation of the 2011 Tohoku‐Oki earthquake constrained by GRACE gravimetry

Cited by 73 publications

References 39 publications

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

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

Seismic nails in various geodynamic conditions

Utility of Slepian basis functions for modeling near-surface and satellite magnetic anomalies of the Australian lithosphere

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