Effects of Earth's layered structure, gravity and curvature on coseismic deformation

Dong, Jie; Sun, Wenke; Xiao-hong, Zhou; Wang, Rongjiang

doi:10.1093/gji/ggu342

Cited by 28 publications

(16 citation statements)

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“…8), and about 4.0 per cent for the source at a depth of 100 km (Fig. 9), which is nearly the same as that reported by Dong et al (2014) using the sphere with a radius of 10R, but a bit smaller. That is because the sphere with a radius of 50R is more precise for our research.…”

Section: Curvature Effect On the Near-field Deformationssupporting

confidence: 85%

“…Above all, by these analytical solutions, we can estimate the curvature effect of any planet, such as the Moon. Dong et al (2014) researched the curvature effect by this method but with some particular assumption, and did not give the detail explanation of this new approach. Also, they had not explored the suitability of this approach for all the planets.…”

Section: Introductionmentioning

confidence: 99%

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An analytical approach to estimate curvature effect of coseismic deformations

et al. 2016

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S U M M A R YWe present an analytical approach to compute the curvature effect by the new analytical solutions of coseismic deformation derived for the homogeneous sphere model. We consider two spheres with different radii: one is the same as earth and the other with a larger radius can approximate a half-space model. Then, we calculate the coseismic displacements for the two spheres and define the relative percentage of the displacements as the curvature effect. The near-field curvature effect is defined relative to the maximum coseismic displacement. The results show that the maximum curvature effect is about 4 per cent for source depths of less than 100 km, and about 30 per cent for source depths of less than 600 km. For the far-field curvature effect, we define it relative to the observing point. The curvature effect is extremely large and sometimes exceeds 100 per cent. Moreover, this new approach can be used to estimate any planet's curvature effect quantitatively. For a smaller sphere, such as the Moon, the curvature effect is much larger than that of the Earth, with an inverse ratio to the earth's radius.

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Section: Curvature Effect On the Near-field Deformationssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

An analytical approach to estimate curvature effect of coseismic deformations

et al. 2016

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“…Their results were calculated by an elastic half-space dislocation theory proposed by Okubo [ 24 ], and they did not take into account the effects of the earth’s layered structure and the curvature of the earth. However, according to Dong et al [ 25 ], the gravity effects of the earth’s layered structure was ~20% with source depth 20 km, and ~25% with source depth 100 km, different from the gravity effects modeled by homogeneous earth model. Hence, concerning the coseismic gravity effects caused by deep-focus earthquakes, the effects of the layered structure should be considered.…”

Section: Introductionmentioning

confidence: 95%

Coseismic Gravity and Displacement Signatures Induced by the 2013 Okhotsk Mw8.3 Earthquake

Zhang

Shen

Chun

et al. 2016

Sensors

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In this study, Gravity Recovery and Climate Experiment (GRACE) RL05 data from January 2003 to October 2014 were used to extract the coseismic gravity changes induced by the 24 May 2013 Okhotsk Mw8.3 deep-focus earthquake using the difference and least square fitting methods. The gravity changes obtained from GRACE data agreed well with those from dislocation theory in both magnitude and spatial pattern. Positive and negative gravity changes appeared on both sides of the epicenter. The positive signature appeared on the western side, and the peak value was approximately 0.4 microgal (1 microgal = 10−8 m/s2), whereas on the eastern side, the gravity signature was negative, and the peak value was approximately −1.1 microgal. It demonstrates that deep-focus earthquakes Mw ≤ 8.5 are detectable by GRACE observations. Moreover, the coseismic displacements of 20 Global Positioning System (GPS) stations on the Earth’s surface were simulated using an elastic dislocation theory in a spherical earth model, and the results are consistent with the GPS results, especially the near-field results. We also estimated the gravity contributions from the coseismic vertical displacements and density changes, analyzed the proportion of these two gravity change factors (based on an elastic dislocation theory in a spherical earth model) in this deep-focus earthquake. The gravity effect from vertical displacement is four times larger than that caused by density redistribution.

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“…This ease of use, however, comes at a cost: these models do not incorporate sphericity or layering and, therefore, are unable to correctly explain the far-field deformation (beyond approximately two to five fault dimensions, in which RAMSAC provides data). The theory behind the discrepancy between model predictions and observations has been studied by Sun and Okubo (2002), Dong et al (2014), and others and will not be discussed here.…”

Section: The Contribution Of Ramsac To Studying South American Megathmentioning

confidence: 99%

The History, State, and Future of the Argentine Continuous Satellite Monitoring Network and Its Contributions to Geodesy in Latin America

Piñón

Gómez

Smalley

et al. 2018

Seismological Research Letters

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Since its creation in 1998, the Argentine Continuous Satellite Monitoring Network (Red Argentina de Monitoreo Satelital Continuo [RAMSAC]) has grown to include more than 100 continuously operating Global Navigation Satellite Systems (GNSS) stations in Argentina. RAMSAC Receiver Independent Exchange Format (RINEX) data and their derived positioning products (e.g., Networked Transport of RTCM via Internet Protocol [NTRIP] streams and time series) have been used in more than 20 peer-reviewed publications studying the inter-, co-, and postseismic geodynamic evolution of the subduction interface between the South America and Nazca plates. Most of this research has focused on the deformation associated with the near-field megathrust earthquake cycle. Nevertheless, many authors have begun to include in their analyses far-field GNSS observations, which in general do not follow the elastic/viscoelastic deformation predicted by current models. We review the contribution of RAMSAC to scientific knowledge of earthquake elastic deformation and associated phenomena. We also describe the future plans for RAMSAC and the societal impact beyond geodetic and geophysical science.

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Effects of Earth's layered structure, gravity and curvature on coseismic deformation

Cited by 28 publications

References 50 publications

An analytical approach to estimate curvature effect of coseismic deformations

An analytical approach to estimate curvature effect of coseismic deformations

Coseismic Gravity and Displacement Signatures Induced by the 2013 Okhotsk Mw8.3 Earthquake

The History, State, and Future of the Argentine Continuous Satellite Monitoring Network and Its Contributions to Geodesy in Latin America

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