A5101498079- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies
- Geophysics and Gravity Measurements
- Geophysical and Geoelectrical Methods
- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Oceanographic and Atmospheric Processes
- Geomagnetism and Paleomagnetism Studies
- Landslides and related hazards
- Hydrocarbon exploration and reservoir analysis
- Geophysical Methods and Applications
- Geophysics and Sensor Technology
- Magnetic Properties and Applications
- Non-Destructive Testing Techniques
- Inertial Sensor and Navigation
- Geological Modeling and Analysis
- Geoscience and Mining Technology
- Rock Mechanics and Modeling
- Reservoir Engineering and Simulation Methods
- GNSS positioning and interference
- Statistical and numerical algorithms
- Seismology and Earthquake Studies
China Earthquake Administration
2010-2025
Institute of Geology, China Earthquake Administration
2025
University of Science and Technology of China
2021
Center for Excellence in Molecular Cell Science
2021
China University of Geosciences
2017
University of Chinese Academy of Sciences
2011
We present the results of third European Comparison Absolute Gravimeters held in Walferdange, Grand Duchy Luxembourg, November 2011. Twenty-two gravimeters from both metrological and non-metrological institutes are compared. For first time, corrections for laser beam diffraction self-attraction implemented. The gravity observations also corrected geophysical changes that occurred during comparison using a superconducting gravimeter. show these improve degree equivalence between gravimeters....
Abstract Changbaishan volcanic field (CBVF) located on the border of China and Democratic People's Republic Korea (DPRK) is famous for intense volcanism in Cenozoic. Many studies show evidence partial melt beneath volcano, but details structure magmatic system are lacking, due to a lack data region. In this study, we obtained high‐resolution crust upper mantle shear wave velocity (Vs) model CBVF by ambient noise tomography receiver functions using new dense seismic array. The absence...
To study the mantle structure of North China Craton (NCC) and its tectonic implications, in particular, evolution rift systems Trans-North Orogen (TNCO), we used teleseismic data recorded by 250 portable seismic stations to invert for P-wave velocity (Vp) structures beneath NCC. Our results show a large-scale low-Vp anomaly shallow high-Vp anomalies deeper upper eastern NCC, with fine-scale at lithosphere–asthenosphere boundary, indicating multi-stage lithospheric delamination during...
The research about subsurface characteristics by using transient electromagnetic method (TEM) and high density resistivity (HDRM) were already conducted in Ordos. objective of this is to detect coalmine goaf areas based on rock resistivity. data processing wavelet transform, three point smoothing, RES2DINV Maxwell software obtain 2D structure. results showed that the layers with maximum values (30–33 Ω m Line 1, 30–31 2, 32–40 3) are founded at station 1–7, 14–20 1,13–18 8–13 16–20 3 which...
• The lithosphere thermal gravity anomaly in the South China Sea is calculated. depth of Moho surface obtained by inversion spherical coordinates with correction. We delineate ocean-continent transition (OCT) northern Sea. In this paper, investigated method under spatial-domain coordinate system based on global field model WGM2012. data are corrected for lithospheric due to large negative residual caused extension ocean and continental margins. calculation results show that mainly...
During November 2011 a EURAMET key comparison of absolute gravimeters was organized in the Underground Laboratory for Geodynamics Walferdange, Luxemburg. The assembled 22 participants coming from 16 countries and four different continents. divided into two parts: that included six National Metrology Institutes or Designated Institutes, pilot study including all participants. global result given by confirms instruments are absolutely coherent with each other. results obtained confirm good...
Previous studies show that the calculated loading effects from global ocean tide models do not match actual measurements of gravity attraction and in Southeast Asia. In this paper, taking advantage a unique network tidal stations all over Chinese mainland, we compare observed modeled on basis most recent models. The results average efficiencies correction for O1, K1, M2 are 77%, 73% 59%, respectively. using better than 40 years old Schwiderskis model at coastal stations, but relative worse far ocean.
In this paper, we calculated Bouguer gravity anomalies and Airy-Heiskanen isostatic in the New Britain Trench surrounding areas of Papua Guinea. The calculations are based on a topographic model anomaly from Scripps Institute Oceanography. Characteristics earthquake dynamic environment region analyzed, results show that there obvious differences state between each block region. Tectonic movements very intense regions with high positive or negative anomalies, number sub-plates area driven by...
Because only a small near-field coseismic gravity change signal remains after removal of noise from the accuracy observations and time spatial resolution earth's surface observation system, it is difficult to verify simulations dislocation theory. In this study, shown that GS15 gravimeter, located 99. 5 km epicenter Ms7. 0 Lushan earthquake on April 20, 2013 at 08 : 04 UTC + 8, showed influence 2013-04-16 2013-04-26 calibration, tide corrections, drift correction, period correction...
The North–South Seismic Belt (NSSB) is a Chinese tectonic boundary with very complex structure, showing sharp change in several geophysical field characteristics. To study these characteristics and their relationship the distribution of earthquakes faults area, we first analyze spatial gravity anomaly to achieve Bouguer (EGM2008 BGA) regional survey anomaly. Next, ascertain Moho depth crustal thickness area using interface inversion control points derived from seismic magnetotelluric...
By using GPS and gravity data before after the Wenchuan Ms8.0 earthquake combining from geological surveys geophysical inversion studies, an initial coseismic fault model is constructed. The dip angle changes of slip distribution on plane are inversed, results show that shape resembles a double-shovel. Yingxiu–Beichuan Fault approximately 330 km long, surface 65.1°, which gradually reduces with increasing depth to 0° at detachment layer 19.62 km. Guanxian–Jiangyou 90 its 55.3°, depth; joins...
This paper deals with the interpretation of Bouguer gravity anomalies measured along a 250 km long Suhaitu-Etuokeqi profile located at transitional zone Alxa and Ordos blocks where geophysical characteristics are very complex. The analysis is carried out in terms ratio elevation anomaly, normalized full gradient section anomaly (G h ) crustal density structure reveal that (1) highs lows large between Zhengyiguan fault (F4) Helandonglu (F6), which can be explained due to inhomogeneities...
The pattern evolution and dynamic mechanism of the changes regional gravity fields occurring before after Wenchuan Ms8.0 earthquake are analyzed, based on five epochs 1998–2007 mobile data from middle-south section north–south seismic belt, two field research collected 2008 in combination with GPS data, leveling observations, geotectonic environment data. demonstrate effects eastward flow solid matter Qinghai-Tibetan plateau preparation (2–10 yr). most meaningful indicators positive...
The study of postseismic deformation is important for constraining the viscoelastic properties Earth and inverting post-earthquake process. levelling survey revealed that area near Beichuan elevated 5.3 cm about two years after MW7.9 Wenchuan earthquake (05/12/2008), during which underwent significant downward movement. GPS horizontal displacements showed a non-monotonic variation earthquake. In this study, 3-D finite element model employed to simulate coseismic numerical simulations show...
Surface co-seismic gravity changes and displacements caused by the Wenchuan Ms8. 0 earthquake are calculated on basis of half-space dislocation theory two fault models inversed, respectively, Institute Geophysics, CEA USGS. The results show that 1) consists dip slip right-lateral strike slip; 2) change shows a four-quadrant pattern, which is greatly controlled distribution vertical displacements, especially in near-filed; 3) generally less than 10 × 10− 8 ms− 2 far-field, but as high several...
Conventional D-InSAR (Differential SAR Interferometry) can only monitor 1-D surface deformation along LOS (line of sight) direction. In order to overcome this limitation and extract 3-D coseismic displacement, we combine the displacement derived from technology, OKADA elastic half space dislocation model theory, jointly rupture distribution by field investigations fault inverted GPS, level data gravity survey retrieve directions co-seismic then have got Wenchuan Ms8.0 Earthquake 3D...
In this study, we analyzed the gravity and, magnetic characteristics, and occurrence of a fault zone discussed relationships between two locations. The results reveal that subsurface structures strikes are different compared with those in research region. other words, geophysical advantageous directions from anomalies not same as caused by surface structures. local horizontal gradient show majority earthquakes occur along an intense zone, which is abrupt negative change, where shapes match...
Using plane dislocation theory and the seismic-wave inversion results from Institute of Geophysics, China Earthquake Administration Geodesy Chinese Academy Sciences models, surface coseismic deformation gravity changes caused by 2013 Ms7.0 Lushan earthquake are simulated. The simulations change indicate that has dip-slip characteristics. also show exhibits a symmetrical, positive-and-negative distribution, with usually being less than 10 mm in farfield but up to 140 near-field. concentrated...
Using the PSGRN/PSCMP software and fault model offered by USGS on basis of finite rectangular dislocation theory local layered wave velocity structures crust-upper-mantle, influences crustal layering thickness co-seismic gravity changes deformation Wenchuan earthquake have been simulated. The results indicate that; a relationship with attitude faults relative position between calculated points fault. difference distribution form simulated two models is similar to that effect. For per centum...
Based on the data of repeated gravity observation network in Chinese mainland since 1998, we analyzed temporal changes regional field before 2008 Yutian Ms7. 3 earthquake. The result shows some mid-to-long term (two to ten years) during earthquake’s preparation. Notable features are a increase lasting several years and relatively large-scaled gradient zone change, former indicating continuous energy accumulation latter possible location seismic rupture. These showed trend...
A gravity survey was conducted one month after the 2010 Yushu earthquake in epicenter area. The cross-fault line 500 km long, from Langqian county to Qingshuihe county, a transition zone between Bayan Har block and Qiangtang block, an area of high elevation, large undulating terrain, complex geological features. An interpretation data carried out together with other kinds data, such as seismic exploration magnetic exploration. result shows that is sensitive fault boundary; geologic structure...