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Figure 1. Local earthquakes recorded by ENSN from Aug. 1997 to Dec. 2004. 3. Hurghada Station Hurghada tidal gravity station is located in Hurghada city (Fig. 2) at the ground floor of the main building of the Seismological Centre at Hurghada, which is close to the shore line of the Red Sea (about 250 meters). The station coordinates are 27.313° N and 33.832° E, and the elevation is 77.25m. A wooden box chamber that consists of double walls of wood and insulation material between the double walls was designed to keep the sensor (gravimeter) isolated from the surroundings. The sensor was installed on a pillar connected to the bedrock, inside the wooden box room, which is separated from the construction of the building. The gravimeter used is the LaCoste-Romberg meter D-218 with electrostatic feedback. The temperature stability in the sensor room is better than 1°C per day. The recording system consists of a multi-channel A/D-converter to provide the feedback output to the computer (Fig. 3). Besides, an UPS (uninterruptible power supply) guarantees for safe power supply and a Laptop is used to download the data. 11848
Figure 2. Location of Hurghada tidal gravity station. Figure 3. Lacoste and Romberg Gravimeter D-218 in the measuring room of Hurghada station (left) and recording system (right). 11849
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MAREES TERRESTRES BULLETIN D'INFORM
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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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the dense seismic observation netwo
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difference of loading effects of oc
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is done with an optical lever using
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6. Application of laser interferome
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Figure 11. Strain seismograms of th
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Higashi, T., 1996, A study on chara
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2. Fundamentals and techniques At t
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100 low frequencies earth tide freq
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Tab. 4: Averages of noise levels at
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References Asch, G., Elstner, C., J
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The 1 / s part is also worth mentio
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As it was mentioned before the resu
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Fig. 9. Morlet Wavelet Spectrum, su
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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
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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 72 and 73: Figure 8: Induced gravity load and
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 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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