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| SOME PROBLEMS CONCERNING REGIONAL GRAVITY SURVEY IN DIFFICULT AREAS AND THEIR COUNTERMEASURES |
| GENG Tao1, LIU Kuan-hou1, HE Hao2, MENG Jun-hai3, YANG Ming-sheng4, GAO Peng1, DU Hui1, TIAN Zhong-ying1 |
1. Xi'an Center of Geological Survey of CGS, Xi'an 710054, China;
2. China Geological Survey, Beijing 100037, China;
3. Third Institute of Qinghai Geological Mineral Prospecting, Xining 810001, China;
4. No. 2 Comprehensive Geophysical Exploration Research Party, Bureau of Geology and Mineral Resources Exploration and Development of Shaanxi, Xi'an 710016, China |
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Abstract It is difficult to carry out regional gravity survey in most parts of Tibetan Plateau due to the harsh natural and communication conditions as well as low level of basic mapping and bad communication. There exist many difficult problems in carrying out regional gravity survey work in this region, such as the selection and calibration of the gravimeter, the establishment of the control range and control points of GPS, the measurement of the level altitude of gravity measurement points, the revision of the near-zone terrain, and the collection of the physical properties of the specimen. Based on summarizing the experience gained from the 1:200000 regional gravity survey in Tibetan Plateau, the authors hold that many problems could be settled by the selection of high-precision and good stability gravimeter, reasonable extension of the closing time, the adoption of CQG2000 quasi-geoid model to figure out the level elevation of a measuring point, and the expansion of the radius of the GPS base station. These measures can be used as references in the regional gravity survey work carried out in the Tibetan Plateau and other difficult areas.
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Received: 27 November 2011
Published: 10 October 2012
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