The gravity and magnetic data can be adopted to interpret the internal structure of Earth. To improve calculation efficiency during inversion process accuracy reliability reconstructed physical property models, triple strategy is in this paper develop a fast cross-gradient joint for data. constraint contains solving gradients models performing cross-product their gradients. sparse matrices are first obtained by calculating derived from first-order finite difference. Then, method applied...

Joint inversion is one of the most effective methods for reducing non-uniqueness geophysical inversion. The current joint can be divided into structural consistency constraint and petrophysical methods, which are mutually independent. Currently, there a need that comprehensively consider constraints constraints. This paper develops similarity index (SSIM) as new gravity vertical gradient data. SSIM in form fraction, may have analytical singularities. Therefore, converting fractional to...

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...

Abstract Geophysical processes of the pre-earthquake activities are difficult to be determined since less pre-seismic signal is observed directly. Crustal density changes derived from periodical terrestrial gravimetry may provide meaningful deep information for cue. In this study, crustal following 2016 M S 6.4 Menyuan earthquake estimated using ground-based gravity-change data 2011 2015 in northeastern Tibetan Plateau. The results show that negative dominate region between South Longshou...

The 4.20 Lushan M S7.0 earthquake occurred on the southwest segment of Longmenshan fault 20 April 2013. Some meaningful information preparation and occurrence this was found based dynamic variation gravity (DVG). To examine great progress earthquake, we obtained density (DENV) derived from DVG using compact inversion method in article. results reveal three main findings: (1) DENV crust Jinshajiang area changed positive 2010–2011 to negative 2011–2012. (2) Xianshuihe decreased continuously...

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...

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...

Non-uniqueness, low computational efficiency and large memory requirements are main issues for geophysical data inversion. In this paper, we propose an efficient algorithm 3D correlationanalysis joint inversion of gravity magnetic with high accuracy computation effort. Firstly, since the number observed field is smaller than inverted parameters, calculations correlation-analysis in model space (MS) transformed into equivalent (DS), which can reduce dimensions calculation domain, improve...

A long-term (9 years) gravity change in Chinese mainland is obtained on the basis of observations ground-based national network. The result shows several features that may be related to some large-scale groundwater pumping North China, glacier-water flow and storage Tianshan region, pre-seismic changes 2008 Ms8.0 Wenchuan earthquake, which are spatially similar co-seismic but reversed sign. These also shown satellite-based GRACE observation, after a height effect corrected with GPS data.

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...

North China is a key region for studying geophysical progress. In this study, ground-based and Gravity Recovery Climate Experiment (GRACE) gravity data from 2009 to 2013 are used calculate the change rate (GCR) using polynomial fitting method. general, study area was divided into Shanxi rift, Jing-Jin-Ji (Beijing-Tianjin-Hebei Province), Bohai Bay Basin (BBB) regions. Results of distribution GCR determined gravimetry show that appears be "negative-positive-negative" west east, which...

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...

Numerous geophysical studies have revealed the lithospheric structure of Qiangtang and Songpan-Ganzi terranes in eastern Tibetan Plateau. However, crust–mantle evolution crustal response to Indian subduction are still controversial. Answering these questions requires additional information regarding structure. In this study, 2-D normalized full gradient (NFG) Bouguer gravity anomaly was used investigate anomalous sources interpret underneath terranes. The NFG-derived structures with...