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BIM 146 December 15, 2010 New Challenges in Earth Dynamics (ETS2008) - end SATO T………………………………………………………………………………………………………….. Importance of ocean tides modeling of regional scale in the Earth tide study (invited paper)................. 11751 TAKEMOTO S………………………………………………………………………………………………….. Centenary research on Earth tides in Kyoto University (1909-2008)(invited paper) ............................... 11767 HEGEWALD A., JENTZSCH G., JAHR TH..………...…………………………………….............................. Comparison of the LaCoste & Romberg gravimeter ET18 with the superconducting gravimeter CD-034 at the Geodynamics Observatory Moxa (Germany)..................................................................................... 11781 ARASZKIEWICZ A., BOGUSZ J…………....………...…………………………………….............................. Application of wavelet technique to the Earth Tides observations analyses ............................................ 11789 HASSAN R.M., ABDELRAHMAN E.M., TEALEB A., ZAHRAN K.H., JENTZSCH G……………………. …… Gravimetric tide observation at Lake Nasser Region, Aswan, Egypt....................................................... 11797 HASSAN R.M., ABDELRAHMAN E.M., TEALEB A., ZAHRAN K.H., JENTZSCH G……………………… Hydrogeological signals due to the seasonal variation of Lake Nasser and its effect on the surrounding crust as deduced from tidal gravity observations.............................................................................................. 11807 PALINKAS V., KOSTELECKY J…………………….………………………………… ............................... Superconducting gravimeter OSG-050 at the station Pecny, Czech Republic ......................................... 11819 Additional scientific papers ABE M., KRONER C., NEUMEYER J., CHEN X. D………………………..................................................... Assessment of atmospheric reductions for terrestrial gravity observations.............................................. 11825 HASSAN R.M., ZAHRAN K.H., JENTZSCH G., WEISE A.…………………….………………………………… A new tidal gravity station at Hurghada, Red Sea, Egypt ........................................................................ 11847
Importance of the ocean tide modeling of regional scale in the Earth tide study Tadahiro Sato Research Center for Prediction of Earthquakes and Volcanic Eruptions, Tohoku University 6-6 Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan E-mail: tsato@aob.geophys.tohoku.ac.jp Abstract This is a summary of an invited talk presented by Sato at the ETS 2008 International Conference ‘New Challenges in Earth’s Dynamics’ that was held in Jena, Germany in September 2008. Main part of the presentation is referred to Sato et al. (2008). Recent improving of the accuracy of the tidal observations and model predictions including the ocean tidal loading (OTL) effects is remarkable. The observed Earth tide data may use to improve the model of the Earth’s inside structure, which exhibits a viscoelastic property as well as the laterally inhomogeneous elastic structure. For these, it is essential to improve the accuracy of both the global and regional ocean tide models. An attempt in the region of Southeast Alaska is introduced. 1. Accuracy of the global ocean tide models Based on the Schwiderski’s ocean tide model (Schwiderski, 1980), Schenewerk et al. (2001) computed the ocean tide effects on the vertical components at the IGS-GPS sites in the world, and compared the observed loading effects. A remarkable point of their comparison results is large discrepancy exceeding 3 cm between the observed loading effect of the M 2 constituent and the computed one along the Pacific coast of Alaska. Thanks to the satellite sea surface altimeters such as TOPEX/Poseidon and Jason-1, the accuracy of the recent global ocean tide models has been much improved compared with those in the 1980s. For example, according to Matsumoto et al. (2000), the vector differences for the M 2 constituent between NAO.99b (Matsumoto et al., 2000) and GOT99.2b (Ray, 1999) are the order of 1 cm or smaller than it almost everywhere in the open seas in the world. Matsumoto et al. (2006) also compared the recent global ocean tide models with the actual ocean bottom pressure gauge (OBPG) measurements in the western Pacific, off Sanriku in northern Japan, and they conclude that the difference between the observation and the five global ocean tide models was less than 1.3 cm in terms of root sum square of the vector differences for eight major tidal constituents (i.e. Q 1 , O 1 , P 1 , K 1 , N 2 , M 2 , S 2 , and K 2 ). The ocean models they compared are NAO.99 (an old version of NAO.99b), NAO.99b, GOT99.2b, CSR4.0 (Eanes and Bettadpur, 11751
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5. Recording of Data The data logge
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Figure 5: Pre-processed hourly data
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Figure 6: Residuals of gravity tide
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time. In addition, models for gravi
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Fig. 3 (Zahran, 2005) shows gravity
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during the years 2003 and 2004. It
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Figure 7: Variation of phase shift,
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Figure 8: Induced gravity load and
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The instrumentation of the tidal st
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4. Tidal analysis The tidal analysi
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References Banka, D., Crossley, D.
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1. Introduction The estimation of a
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Figure 1 Air density distributions
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temperature effect is considered, t
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Figure 4 Attraction effect from the
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a ) up to 0.5° , b) 0.5°- 1.5° ,
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Figure 7 Atmospheric reductions for
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Figure 9 Amplitude spectra of diffe
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Figure 10 SG observation and gravit
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eduction in the long-period tides r
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oceans. The effect has a peak-to-pe
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Figure 1. Local earthquakes recorde
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4. Recording of Data The recorded d
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Table 1: Adjusted tidal parameters
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Acknowledgements: The authors are i
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