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Figure 8: Induced gravity load and residual gravity, Lake Nasser Area, Aswan, Egypt (from 2002 to 2004). Acknowledgements: The authors are indebted to the Department of Geophysics, Faculty of Science, Cairo University and the National Research Institute of Astronomy and Geophysics (NRIAG) for the encouragement of this work. We thank the Regional Seismological Center at Aswan for providing the facilities for the measurements. Finally we are grateful to the German Academic Exchange Service (DAAD) for supporting the work by travel funds to RMH and GJ. References Bell, M. L. and Nur, A., 1978. Strength changes due to reservoir - induced pressure and stress and application to Lake Oroville. J. Geophys. Res., vol. 83, pp. 4469 - 4483. Fat-Helbary, R. E., 1995. Assessment of seismic hazard and risk in Aswan area, Egypt. Ph. D. Thesis. Architectural Engineering Department Tokyo Univ., Japan, 182p. Hassan R.M., Abdelrahman E.M., Tealeb A., Zahran K.H., Jentzsch G., 2009. Gravimetric tide observation at Lake Nasser Region, Aswan, Egypt: a preliminary investigation, Bull. Inf. Marées Terrestres , 146, 11797-11806. Issawi, B., 1968. The geology of Kurkur - Dungle area. General Egyptian Organization for Geological Research and Mining, Geol. Surv. Cairo, Egypt. Paper No. 46, 102P. Issawi, B., 1978. Geology o f Nubia west area , Western Desert, Egypt. Annals Geo. Surv., Egypt, vol. 8, PP. 237 – 253. Kebeasy, R. M. Maamoun, M. and Ibrahim, E., 1982. Aswan Lake induced earthquakes. Bull. Int. Inst. Seismology & Earthquake Engineering, Tokyo, Japan, vol. 19. Kebeasy, R. M., Maamoun, M., Ibrahim, E. M., Meghahed, A., Simpson, D. and Leith, W., 1987. Earthquake studies at Aswan reservoir. J. of Geodynamics, Vol. 7, pp. 173–197. Roeloffs, E. A., 1988. Fault stability changes induced beneath a reservoir with cyclic variations in water level. J. Geophys. Res., vol. 93, pp. 2107-2124. Snow, D. T., 1972. Geodynamic of seismic reservoirs, symposium on percolation through fissured rocks. Proceedings, Deutsche Gesellschaft für Erd- und Grundbau, Germany, T2- J, pp. 1- 14. Simpson, D. W., 1986. Triggered Earthquakes. Ann. Rev. Earth plant Sci. 14, 21- 42. Vyskočil, P. and Tealeb, A., 1985. Report on activity by monitoring recent crustal movement at Aswan period 1983-1985. Bull. Helwan Inst. of Astronomy and Geoph., vol. II, Ser. B, pp. 33-41. Vyskočil, P., 1987. Recommendations on the project of monitoring recent crustal movements in the western part of the Aswan region in Egypt. J. of Geodynamics, vol.7, pp. 257-259. 11816
Vyskočil, P. and Tealeb, A., 1995. The present stage and prospect for recent crustal movement studies around seismo-active areas in Egypt. Bull. Helwan Inst. of Astronomy and Geophysics, vol. xi, pp. 105-138. Wenzel, H. G., 1996a. The nanogal software: Earth tide data processing package ETERNA 3.30. Bulletin d’Inf. Marèes Terr., vol. 124, pp. 9425-9439. Wenzel, H. G., 1997. Analysis of the Earth tide observations In: Wilhelm, H., W. Zürn and H.-G. Wenzel (Eds), Tidal Phenomena. Lecture Notes in Earth Sciences, Springer Verlag, Berlin, Germany, pp. 59-75. WCC (Woodward - Clyde Consultants), 1985. Identification of earthquake sources and estimation of magnitudes and recurrence intervals, Internal Report, High and Aswan Dams Authority, Aswan, Egypt, 135p. Zhang, K. F., Featherstone, W. E. , Bian, S. F., and Tao, B. Z., 1996. Time variation of the Earth's gravity field and crustal deformation due to the establishment of the Three Gorges reservoir, J. Geod., vol. 70, pp. 440-449. Zahran, K. H., Jentzsch, G. and Seeber, G., 2005. World – wide synthetic tide parameters for gravity and vertical and horizontal displacements. J. Geod., vol. 79, pp. 293-299. Zahran, K. H., 2005. Benefit of tidal observations to gravity and GPS networks. Egyptian Geophys. Soc. Journal, vol. 3, No. 1, pp 89-98. 11817
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BIM 146 December 15, 2010 New Chall
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1994), and TPXO.6 (Egbert et al., 1
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4. An attempt to improve the region
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From Fig. 2, we also see that, the
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GPS network called GEONET (GPS Eart
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References Bos, M. S., Baker, T. F.
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Planets Space, 59, 307-311. Sato, T
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Fig. 1. Locations of the observatio
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Page 24 and 25: the dense seismic observation netwo
Page 26 and 27: difference of loading effects of oc
Page 28 and 29: is done with an optical lever using
Page 30 and 31: 6. Application of laser interferome
Page 32 and 33: Figure 11. Strain seismograms of th
Page 34 and 35: Higashi, T., 1996, A study on chara
Page 38 and 39: 2. Fundamentals and techniques At t
Page 40 and 41: 100 low frequencies earth tide freq
Page 42 and 43: Tab. 4: Averages of noise levels at
Page 44 and 45: References Asch, G., Elstner, C., J
Page 46 and 47: The 1 / s part is also worth mentio
Page 48 and 49: As it was mentioned before the resu
Page 50 and 51: Fig. 9. Morlet Wavelet Spectrum, su
Page 52 and 53: 9. CONCLUSIONS This investigation w
Page 54 and 55: 2. Objectives of Aswan Tidal Gravit
Page 56 and 57: 5. Recording of Data The data logge
Page 58 and 59: Figure 5: Pre-processed hourly data
Page 60 and 61: Figure 6: Residuals of gravity tide
Page 64 and 65: time. In addition, models for gravi
Page 66 and 67: Fig. 3 (Zahran, 2005) shows gravity
Page 68 and 69: during the years 2003 and 2004. It
Page 70 and 71: Figure 7: Variation of phase shift,
Page 76 and 77: The instrumentation of the tidal st
Page 78 and 79: 4. Tidal analysis The tidal analysi
Page 80 and 81: References Banka, D., Crossley, D.
Page 82 and 83: 1. Introduction The estimation of a
Page 84 and 85: Figure 1 Air density distributions
Page 86 and 87: temperature effect is considered, t
Page 88 and 89: Figure 4 Attraction effect from the
Page 90 and 91: a ) up to 0.5° , b) 0.5°- 1.5° ,
Page 92 and 93: Figure 7 Atmospheric reductions for
Page 94 and 95: Figure 9 Amplitude spectra of diffe
Page 96 and 97: Figure 10 SG observation and gravit
Page 98 and 99: eduction in the long-period tides r
Page 100 and 101: oceans. The effect has a peak-to-pe
Page 104 and 105: Figure 1. Local earthquakes recorde
Page 106 and 107: 4. Recording of Data The recorded d
Page 108 and 109: Table 1: Adjusted tidal parameters
Page 110 and 111: Acknowledgements: The authors are i
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