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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS011 Poster presentation 2138 Behavior of the high-dam building and surrounding areas derived from leveling and GPS measurements, Aswan-Egypt Dr. Abdel-Monem Mohamed Geodynamics National Research Institute of Astronomy & Geophys IAG Several leveling lines were established at different levels along the High-Dam building during its construction. One of those leveling lines is at the up-stream berm (186m), two of them are at the up and down stream parapets (196m) and the others are at the downstream berm (179, 162, 145, 130, 114m). Precise leveling measurements were carried out, along these leveling lines, each month since 1970 and continue till now. Analysis of the leveling data from the different leveling lines for the period from 1970 to 2006 were carried out in order to study the behavior of the High-Dam building during this period, especially the rock filled part of the High-Dam building. The results from the analysis reveals different tendencies of setteling for the different parts, different sections and similar positions at different levels of the High-Dam building. The rates of setteling of the High Dam body are stable since 1975. No significant correlations were found between the rates of setteling and water level changes at the down-stream side of the High Dam, while at the up-stream side some part of correlation were remarked between the rates of setteling and the seasonal variations of the water level in the lake (cycles of charge and discharge) especially during the first ten years (1970- 1980). Also, no significant correlations were found between the rates of setteling and the earthquake occurrence in the area of the northern part of lake Nasser. For monitoring the horizontal movements in the High Dam area, a local GPS network consisting of 10 geodetic stations was established in 2000. The measurements were carried out during the period from 2002 to 2006. nine campaigns of GPS were carried out in the study area. The measurements are correlated to the water level changes in the lake, as well as to the seismic activity in the area. The displacements for each epoch of observations were calculated and the deformation analysis was performed. The horizontal displacements vary between 1 to 2 mm/yr. The horizontal rates and strain accumulations are small, which reflect the stable situation, and demonstrates a new information about the present state of the High Dam body and surrounding areas. Keywords: leveing, gps, deformation
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS011 Poster presentation 2139 The Joint Inversion Study on the Driving Forces Acting on the Block Boundaries and Tectonic Stress Field of China Mainland and Its Adjacent Areas Dr. Zhixing Du Key Laboratory of Foundational Geo-information Shandong University of Science & Technology IASPEI Fanlin Yang, Xiushan Lu China situates on the southeast of Eurasian plate. It is joined with the Pacific-oceanic plate in the east and with the Indian plate in the south. The development and interaction of three plates shape the present tectonic framework. As one of the most drastic districts of new global tectonic change and present tectonic motion, it is an uncommon and superior district to study the inner continent and its marginal lithosphere and geodynamics. It plays an important role in geoscience study and is broadly concerned by geoscience scientists. In recent decades, geoscience scientists did a lot of work in the fields of tectonic structure, geophysical field, infrastructure, seismic activity and tectonic motion. It established a good base for the study of driving source of tectonic motion of inner block. This paper after expatiating the status and evolution of the inversion study on the driving forces acting on the boundaries of China mainland and its adjacent areas and the tectonic stress field, the inversion computation of them is made by means of the finite element of genetic method according to the displacement observations obtained from the Crustal Movement Observation Network of China and tectonic stress fields, and the specific implementation procedure including the selection of the parameters, the computation conditions of model, the method of inversion, the analysis of inversion results and their interpretation for inversion computation is given out in detail. The following conclusions can be drawn from analyses: (1) the main driving forces that formed the displacement field in Chinese mainland and tectonic stress field are still from the collision of Indian plate with Eurasian plate. (2) Although the driving forces of Pacific plate and Philippine plate are smaller than that of Indian plate, yet they are the significant factors that affect eastern China. (3) The back basin of Japan sea arc is continuously extending possibly because of the drag to continent formed after the oceanic crust dropped back. (4) The forces form north prevent the northern motion of China which are relatively big resistive forces. (5) Neijiang river fracture and Xilamulun river fracture has the sign of motion, but the exact motion mode is still uncertain. Keywords: tectonic stress fields, crustal movement observation, joint inversion
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy<br />
(S) - <strong>IASPEI</strong> - International Association of Seismology and Physics of the Earth's<br />
Interior<br />
JSS011 Poster presentation 2138<br />
Behavior of the high-dam building and surrounding areas derived from<br />
leveling and GPS measurements, Aswan-Egypt<br />
Dr. Abdel-Monem Mohamed<br />
Geodynamics National Research Institute of Astronomy & Geophys IAG<br />
Several leveling lines were established at different levels along the High-Dam building during its<br />
construction. One of those leveling lines is at the up-stream berm (186m), two of them are at the up<br />
and down stream parapets (196m) and the others are at the downstream berm (179, 162, 145, 130,<br />
114m). Precise leveling measurements were carried out, along these leveling lines, each month since<br />
1970 and continue till now. Analysis of the leveling data from the different leveling lines for the period<br />
from 1970 to 2006 were carried out in order to study the behavior of the High-Dam building during this<br />
period, especially the rock filled part of the High-Dam building. The results from the analysis reveals<br />
different tendencies of setteling for the different parts, different sections and similar positions at<br />
different levels of the High-Dam building. The rates of setteling of the High Dam body are stable since<br />
1975. No significant correlations were found between the rates of setteling and water level changes at<br />
the down-stream side of the High Dam, while at the up-stream side some part of correlation were<br />
remarked between the rates of setteling and the seasonal variations of the water level in the lake<br />
(cycles of charge and discharge) especially during the first ten years (1970- 1980). Also, no significant<br />
correlations were found between the rates of setteling and the earthquake occurrence in the area of the<br />
northern part of lake Nasser. For monitoring the horizontal movements in the High Dam area, a local<br />
GPS network consisting of 10 geodetic stations was established in 2000. The measurements were<br />
carried out during the period from 2002 to 2006. nine campaigns of GPS were carried out in the study<br />
area. The measurements are correlated to the water level changes in the lake, as well as to the seismic<br />
activity in the area. The displacements for each epoch of observations were calculated and the<br />
deformation analysis was performed. The horizontal displacements vary between 1 to 2 mm/yr. The<br />
horizontal rates and strain accumulations are small, which reflect the stable situation, and demonstrates<br />
a new information about the present state of the High Dam body and surrounding areas.<br />
Keywords: leveing, gps, deformation
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