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Zheng R.,Second Monitoring and Application Center
Proceedings of the 2014 International Symposium on Information Technology, ISIT 2014 | Year: 2015

Data and information regarding the relationships between various measures of health and the socioeconomic status of Georgia communities are studied using ArcGIS softwares to determine if there are patterns that would be helpful in developing policies that target programs and allocate resources. © 2015 Taylor & Francis Group, London.

Gao S.,Prediction Institute | Fu G.,Prediction Institute | Liu T.,Prediction Institute | Zhang G.,Second Monitoring and Application Center
Pure and Applied Geophysics | Year: 2017

Tanaka et al. (Geophys J Int 164:273–289, 2006, Geophys J Int 170:1031–1052, 2007) proposed the spherical dislocation theory (SDT) in a spherically symmetric, self-gravitating visco-elastic earth model. However, to date there have been no reports on easily adopted, widely used software that utilizes Tanaka’s theory. In this study we introduce a new code to compute post-seismic deformations (PSD), including displacements as well as Geoid and gravity changes, caused by a seismic source at any position. This new code is based on the above-mentioned SDT. The code consists of two parts. The first part is the numerical frame of the dislocation Green function (DGF), which contains a set of two-dimensional discrete numerical frames of DGFs on a symmetric earth model. The second part is an integration function, which performs bi-quadratic spline interpolation operations on the frame of DGFs. The inputs are the information on the seismic fault models and the information on the observation points. After the user prepares the inputs in a file with given format, the code will automatically compute the PSD. As an example, we use the new code to calculate the co-seismic displacements caused by the Tohoku-Oki Mw 9.0 earthquake. We compare the result with observations and the result from a full-elastic SDT, and we found that the Root Mean Square error between the calculated and observed results is 7.4 cm. This verifies the suitability of our new code. Finally, we discuss several issues that require attention when using the code, which should be helpful for users. © 2016, Springer International Publishing.

Li R.-S.,Second Monitoring and Application Center | Zhang X.,Second Monitoring and Application Center | Tang H.-T.,Second Monitoring and Application Center | Jia P.,Second Monitoring and Application Center | Lu Z.,Second Monitoring and Application Center
Earthquake | Year: 2016

With earthquakes above Ms5.8 in cross-fault monitoring area of the northeastern margin of Qinghai-Tibet block, combined with previous research, we re-sort cross-fault data, and focus on the anomalies before earthquakes of the 1995 Yongdeng Ms5.8, the 2000 Jingtai Ms5.9, the 2003 Minle-Shandan Ms6.1 and the 2013 Minxian-Zhangxian Ms6.6 earthquakes. The results shows that numbers of cross-fault anomalies before the 4 typical earthquakes are in the range of 13~23 items; abnormal wide distribution in the range of 600 km from the epicenter, relatively concentrated in the range of within about 300 km, also had nearly earthquake zone anomalies. Anomaly characteristics are mainly inverse acceleration, trend turns, increased activity, jumps, and sharp changes. Anomalies began to appear 2~3 years or a little longer before the earthquake, concentrated appear before the earthquake in the period of six months to one year and a half, had mid background and short-term precursory significance, and characteristics of the spatial distribution of anomalies migrated to epicenter with time. © 2016, Science Press. All right reserved.

Wang S.-X.,Second Monitoring and Application Center | Xue F.-P.,Second Monitoring and Application Center | Li N.,Second Monitoring and Application Center
Earthquake | Year: 2012

Based on a brief summary on the practice of crustal deformation monitoring and earthquake prediction, and combined with the existing research results of regional crustal deformation before the 2001 M S8.1 Kunlun and the 2008 M S8.0 Wenchuan earthquake, this paper elaborates that it is necessary and important to focus on the geological background and tectonic deformation in different layout modes to enhance the ability of seismic deformation monitoring in considering that today the crustal deformation observation technologies continuously advance to high precision, high resolution and efficiency and convenience. Then according to the regional tectonic dynamic background and deformation mode of the southwest margin of the Ordos block, we present and discuss some ideas and methods which can optimize the layout of monitoring and capture the dynamic information of the abnormal surface changes effectively in this key monitoring area.

Zheng R.,Second Monitoring and Application Center
Proceedings - 2013 4th International Conference on Digital Manufacturing and Automation, ICDMA 2013 | Year: 2013

Geographic Information System (GIS) technology is more and more used even in the technical practice of a construction industry. In the preparatory phase of the construction, the problems of a spatial positioning (location) of the construction have to be solved jointly with the checking of the feasibility and purposefulness, the traffic projects are worked out, and the alternative. More detailed solutions of technical problems are designed. At project development there are used various forms of initial documents, results of the actual data gathering and surveys, map sheets, photographs, previous documents referring to the problems solved, and appropriate legal and technical standards. The article presents the experience with the issue of GIS in construction in preparation of buildings, in the implementation phase of the construction in GIS. It presents a model of information system construction and technology of mobile GIS for data collection and use of mobile GIS in water management. © 2013 IEEE.

Zheng R.,Second Monitoring and Application Center
Proceedings - 2013 4th International Conference on Digital Manufacturing and Automation, ICDMA 2013 | Year: 2013

For its complexity, engineering construction schedule design is limited by various factors. Simulation-based engineering construction schedule takes critical path method network as frame and calls complex cyclic operation network simulation model enclosed in advance for its simulation nodes. Cyclic operation network simulation model takes charge of simulating stochastic duration of activity and efficiency of resources, while critical path method model performs proiect scheduling. This combination avoids the shortcomings of both models. Furthermore, geographic information system (GIS) technique is utilized to visuallze the construction processes which are otherwise difficult to be understood by static results described. Application in practical proiect verifies the feasibility and advantage of the technique. © 2013 IEEE.

Qu W.,Chang'an University | Qu W.,University of Glasgow | Zhang Q.,Chang'an University | Wang Q.,Second Monitoring and Application Center | Li Z.,University of Glasgow
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2011

In this paper, two-dimensional finite model of elastic mechanics is established according to the geological structure features of Weihe Basin. And the author obtains the stress and strain characteristics by the 2001~2007 GPS data in this region. In the end combine with the characteristic of recently seismic activity in Weihe basin, The relation between crustal deformation characteristics and the seismic activity is also discussed. The results show that current tectonic stress field of this basin presents tensile stress with NNW-SSE direction. The spatial distribution of maximum shear strain rate in Weihe basin has a very good correlation with small modern seismic belt. The region of Jingyang-Xianyang-Xi'an-Lintong-Sanyuan belongs to the weak zone in the crust of Weihe Basin which is apt to basin extension and earthquake preparation.

Qu W.,Chang'an University | Lu Z.,Southern Methodist University | Zhang Q.,Chang'an University | Li Z.,University of Glasgow | And 4 more authors.
Journal of Geodynamics | Year: 2014

Using high precision GPS data for the period of 1999-2007 from the China Crustal Movement Observation Network, we have constructed a plate kinematic model of crustal deformation of Fenwei basin, China. We have examined different kinematic models that can fit the horizontal crustal deformation of the Fenwei basin using three steps of testing. The first step is to carry out unbiasedness and efficiency tests of various models. The second step is to conduct significance tests of strain parameters of the models. The third step is to examine whether strain parameters can fully represent the deformation characteristics of the 11 tectonic blocks over the Fenwei basin. Our results show that the degree of rigidity at the Ordos, Hetao, Yinshan and South China blocks is significant at the 95% confidence level, indicating the crustal deformation of these blocks can be represented by a rigid block model without the need to consider differential deformation within blocks. We have demonstrated that homogeneous strain condition is suitable for the Yinchuan basin but not for other 6 blocks. Therefore, inhomogeneous strains within blocks should be considered when establishing the crustal deformation model for these blocks. We have also tested that not all of the quadratic terms of strain parameters are needed for the Yuncheng-Linfen block. Therefore, four kinds of elastic kinematic models that can best represent the detailed deformation characteristics of the 11 blocks of Fenwei basin are finally obtained. Based on the established model, we have shown that the current tectonic strain feature of the Fenwei basin is mainly characterized by tensile strain in the NW-SE direction, and the boundaries betweem the Ganqing and Ordos blocks and the Shanxi graben possess the maximum shear strain. A comparison between our results and past geological and geophysical investigations further confirms that the model established in this paper is reasonable. © 2014 Elsevier Ltd.

Qu W.,Chang'an University | Qu W.,Key Laboratory of Western Chinas Mineral Resources and Geological Engineering | Qu W.,University of Glasgow | Zhang Q.,Chang'an University | And 3 more authors.
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2013

Spirit leveling observations, together with engineering geological data are employed to determine the source parameters of active faults and ground fissures in the Qingxu region using two double dislocation fault models. The optimal model suggests that: (1) the relationship between active faults and ground fissures in the study region appear to be a "Y" pattern. (2) The present rifting velocities of ground fissures are up to 15.1 mm·a-1, greater than their corresponding dip slips. (3) The lower boundary of ground fissures is at depths of around 380 m. (4) The dip-slip rates of ground fissures are greater than those of active faults (1.6 mm·a-1). The results are consistent with hydrological and geophysical data.

Rui Z.,Second Monitoring and Application Center
Proceedings - 2011 4th International Conference on Biomedical Engineering and Informatics, BMEI 2011 | Year: 2011

The fluctuation in neon flying squid yield from 1995 to 2001 was studied using sea surface temperature (SST), chlorophyll-a (chl-a) data and statistical production data in North Pacific. The study shows that, cool water and low food abundance caused by abnormal Kuroshio caused the reduction in abundance of neon flying squid, which was worsened by excessive catch and the unawareness to local fishery grounds. © 2011 IEEE.

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