Changyi Xu

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Verified

Changyi verified their affiliation via an institutional email.

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• Ph. D of Solid Geophysics
• Professor (Associate) at Institute of Geology and Geophysics, Chinese Academy of Sciences

The history of the thermal and dynamic evolution of the Moon is partly recorded by lunar linear structures. Identification and analysis of subsurface linear structures and their associated gravity anomalies provide insights into the early evolution of the Moon. However, the current understanding of their deep extensions is limited. In this study, w...

The low-degree gravity field and rotation parameters of terrestrial planets are functions of the plan-et's interior structure, providing insights into their composition and evolution, which serves them as crucial targets throughout deep-space exploration. Particularly, the measurement of rotation state can directly reveal the density and size of mo...

The Moon and Mars are adjacent to Earth and are starting stations for human exploration of the Universe. An in-depth study of the lithospheric structure of the Moon and Mars can reveal the composition and structure of their crust and mantle systems and deepen our understanding of their origins and thermal evolution histories, providing essential re...

Plain Language Summary Volcanism is common on the Moon, which provides an important window into its topography and thermal evolution. The surface topography of the Gardner region displays a series of small shield‐like domes, sinuous rilles, and irregular depressions. It has been identified as one of the eight large volcanic complexes on the Moon. H...

New advances in lunar and related planetary studies

The spatiotemporal evolution of lunar impact craters is crucial for investigating lunar interior structure, internal and external dynamic processes, and interplanetary impact history. Advances in lunar crater identification are reviewed based on topography and gravity data, and the features and mechanisms of topographic or buried craters are analyz...

Hydrological modulation of background seismicity provides a way to understand the seismogenic process and interaction mechanism between the hydrosphere and lithosphere. To elucidate the hydrological modulation of background seismicity in the Longmen Shan, the monthly spatiotemporal distribution of terrestrial water storage (TWS) variations is inver...

As the largest basin on Mars, Utopia Planitia has both experienced and recorded variations of the Martian palaeoclimate. Layered subsurface structures have been identified by ground-penetrating radar in southern Utopia Planitia but lateral variations of the subsurface, potentially linked to the Martian palaeoclimatic evolution, have not been invest...

Seismic dislocation theory is the theory of studying the relationship between seismic fault slip and geophysical field change，and also it is the link between the source mechanism，the internal structure of the Earth，earthquake forecasting and other basic geophysical problems and geodetic-geophysical observation. The widely used dislocation theory of...

Plain Language Summary The whole seismic cycle usually has three stages: Interseismic, coseismic, and postseismic, which have different behaviors. The effect of coseismic deformation on changes in a suit of global geodynamic quantities is a long‐standing topic, which has been found that their cumulative changes have a significant influence on these...

The seasonal terrestrial water load modulation of seismicity is an important phenomenon to understand the mechanism behind earthquake triggering and nucleation. The presence of high-level seismicity and large seasonal water load amplitudes at the southeastern margin of the Tibetan Plateau provides a natural experimental environment for studying the...

The energy changes corresponding to the axis and speed of the Earth’s rotation are the polar motion energy, ΔEpm and the spinning energy, ΔEss. Here we develop an explicit approach to compute the coseismic ΔEpm and ΔEss based on a spherical-Earth elastic dislocation theory. We estimate the cumulative changes induced by global major earthquakes from...

Earthquake‐induced mass redistribution in the Earth excites the polar motion; its cumulative coseismic effect has been found to cause a secular polar drift (SPD) toward ~140°E longitude with strong statistical tendency. Here we find numerically the cumulatively coseismic effect in SPD since 1952 to be at the rate of ~0.75 mas/year (or ~2.3 cm/year)...

Based on eight published plate motion models, we separately estimated the net area changes of tectonic plates and the area change of the solid Earth surface over geological time using the Euler vectors of plates with determined boundaries. Then, under the context of a currently expanding Earth, we inferred the change rate of the Earth's mean radius...

Based on the recently published GRACE data of Release 6 (RL06) from the Center for Space Research (CSR), we estimate the ice mass changes over 27 Antarctic drainage systems using a new method of Slepian space domain inverse (SSDIM), which is developed by combining the Slepian spatiospectral concentration method (SSCM) and the space domain inverse m...

In this paper, we estimate sea level change of China’s coast sea level change from GRACE（Gravity Recovery and Climate Experiment）satellite gravimetry, satellite altimetry and seawater temperature and salt data. China’s coastThe results show that trend of sea level trend rise during 1993-2014 were respectly Bohai 3.14±0.43 mm/a in Bohai , Huanghai 2...

We compute the coseismic gravitational potential energy Eg change using the spherical-Earth elastic dislocation theory and either the fault model treated as a point source or the finite fault model. The rate of the accumulative Eg loss produced by historical earthquakes from 1976 to 2016 (about 4,2000 events) using the GCMT catalogue are estimated...

S U M M A R Y Coseismic changes of gravity and displacements produced by the 2013 Okhotsk Sea earthquake (M w 8.3) are computed by using a dislocation theory for a spherically symmetric Earth model and distributed-slip source models, and respectively compared to the results observed from the GPS (Global Positing System) and GRACE (Gravity Recovery...

The current work describes the combined data of three field campaigns, spanning 2009–2013. Their joint gravity and GPS observations thoroughly cover the sites of lithospheric flexure between the Sichuan Basin and the Eastern Tibetan Plateau. The study area’s free-air gravity anomalies (FGAs) are updated by using a remove-and-restore algorithm which...

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 d...

We raise attention to the issue of consistency between the reference frame with respect to which the seismological model calculations of displacement are made on one hand, and that to which the geodetic measurements of crustal deformation refer (e.g. the ITRF) on the other. This issue is critical in principle if the seismologically calculated displ...

The GRACE (Gravity Recovery and Climate Experiment) mission has continually provided the data of temporal variability of the global gravity after its launch. Several coseismic gravity changes have been successfully retrieved by the GRACE mission. The visco-elastic dislocation theory is used to study the co- and post-seismic deformations. In this pa...

In this paper we present analytical formulas to compute the co-seismic Earth rotation change (polar motion and length of day) and low-degree gravity field change based on a spherical dislocation theory. Using the PREM earth model and our formulas, we calculate co-seismic changes in Earth's rotation and low-degree Stokes coefficients caused by the f...

In this paper, we propose an approach to compute the coseismic Earth's volume change based on a spherical-Earth elastic dislocation theory. We present a general expression of the Earth's volume change for three typical dislocations: the shear, tensile and explosion sources. We conduct a case study for the 2004 Sumatra earthquake (M(w)9.3), the 2010...

We calculated the co-seismic Earth rotation changes for several typical great earthquakes since 1960 based on Dahlen's analytical expression of Earth inertia moment change, the excitation functions of polar motion and, variation in the length of a day (Delta LOD). Then, we derived a mathematical relation between polar motion and earthquake paramete...

Earthquakes heavily deform the crust in the vicinity of the fault, which leads to mass redistribution in the earth interior. Then it will produce the change of the Earth’s rotation (polar motion and length of day) due to the change of Earth inertial moment. This paper adopts the elastic dislocation to compute the co-seismic polar motion and variati...