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1 REPORT OF HYDROGRAPHIC AND OCEANOGRAPHIC RESEARCHES No.45 March, 2009 LAGEOS SLR Re estimationofthevelocityofsimosatofromanalysisoflageosslrdata MarikoSATO,HiroshiMATSUSHITA,MasayukiFUJITA andaratasengoku Abstract Simosato Hydrographic Observatory in Wakayama Prefecture has been carrying out Satellite Laser Ranging SLR observation forajisai, LAGEOS, LAGEOS, and other geodetic and Earth observation satellites, since.morethan passeshavebeenobtained. Inthisreport,were estimatedthevelocityofsimosatofromlageosslrdataforyears.asaresult,the velocityof cm/yearindirectiontonrelativetotheeurasianplatewasobtained.thisvelocityiscloseto the subduction velocity of the Philippine Sea plate. This indicates that the interplate coupling at this region is strong.inaddition,ourresultisconsistentwithotherresearchesusingslrdata e.g.,itrfitrfslr rescaled. AJISAILAGEOS LAGEOS SLR : Satellite Laser Ranging Fig SLR Sengoku SLR ITRF : International Terrestrial Reference Frame Received December Accepted January Geodesy and Geophysics Office nd Regional Coast Guard Headquarters Technology Planning & International Affairs Division Hydrographic Surveys Division 1

, SLR LAGEOS SLR Sengoku AJISAI SLR SLR cm/year AJISAILAGEOS LAGEOS SLR GPS Sengoku LAGEOS SLR SLR SLR LAGEOS

2 Mariko SATO, Hiroshi MATSUSHITA, Masayuki FUJITA and Arata SENGOKU Fig Satellite Laser Ranging at the Simosato Hydrographic Observatory. SLR Smith et al., Tapley et al., SLR LAGEOS SLR Sengoku AJISAI SLR SLR cm/year AJISAILAGEOS LAGEOS SLR GPS Sengoku LAGEOS SLR SLR SLR LAGEOS LAGEOS NP NP Table NP SLR NASA GSFC GEODYN II/ SOLVE Eddy et al.,ullman, GEODYN II a GGMC Tapley et al., IERS Conventions McCarthy, Table Summary of global LAGEOS data fromto 2

3 Re estimationofthevelocityofsimosatofromanalysisoflageosslrdata Fig Time series of estimated coordinate of Simosato station. Large earthquakes MMoccurred about km southeast of Simosato on September th. IERS Bulletine B ITRFBoucher et al., ITRF Greenbelt Herstmonceux Greenbelt Herstmonceux Fig Fig km M M cmcm 3

4 Mariko SATO, Hiroshi MATSUSHITA, Masayuki FUJITA and Arata SENGOKU Fig l = aeψg aecos sinφ sinφcosφ cosφ cos λλ ae Ψg φ λ SLR Sengoku cm no net rotation NNR NNR NUVELA : DeMets et al., NNR NUVELA Greenbelt Herstmonceux ITRFBoucher et al., no-netrotation NNR Fig Definition of arc between station and station Sengoku. 4

5 Re estimationofthevelocityofsimosatofromanalysisoflageosslrdata Table List of SLR stations used for the estimation of velocities. Fig Locations of SLR stations used for velocity estimation. Table Fig Table M Mcm Arequipa M 5

6 Mariko SATO, Hiroshi MATSUSHITA, Masayuki FUJITA and Arata SENGOKU Hartebeesthoek Arequipa Hartebeesthoek cm/ year Table cm/year McDonald Arequipa cm/year Yarragadee cm/year McDonald cm/year no net rotation NNR Greenbelt Herstmonceux ITRF Table Fig Table Arc length rates between Simosato and other SLR stations. 6

7 Re estimationofthevelocityofsimosatofromanalysisoflageosslrdata Table Estimated velocities and the differences from velocities of ITRFITRFSLR rescaled and NUVELA. unit : cm/year * Vn, Ve of Greenbelt and Vn of Herstmonceux are fixed to the velocities of ITRF

8 Mariko SATO, Hiroshi MATSUSHITA, Masayuki FUJITA and Arata SENGOKU Fig Velocity vectors of SLR stationa Worldb Europec Asia. Red arrows, blue arrows, purple arrows and green arrows show the estimated velocities, velocities of ITRFITRF SLR rescaled and NUVELA, respectively. Table Fig ITRFITRFSLR rescaled, Altamimi et al., NUVELA cm/year Mt.Stromlo Arequipa cm/year ITRF ITRFSLR rescaled cm/year Riyadh ITRFcm/year ITRFSLR rescaled ArequipaITRFITRF 8

Fig Differences between estimated velocities and velocities calculated from

9 Re estimationofthevelocityofsimosatofromanalysisoflageosslrdata Fig Correlations between estimated velocities and a ITRF/ b ITRFSLR rescaled. Fig Differences between estimated velocities and velocities calculated from NUVELA. SLR rescaled Arequipa ITRFITRFSLR rescaled Fig ITRF SLR rescaled NUVELA NUVELA 9

Mariko SATO, Hiroshi MATSUSHITA, Masayuki FUJITA and Arata SENGOKU Fig Table Fig NUVEL A cm/year SLR NUVELA NUVELA ITRF ITRFSLR rescaled NUVELA NUVELA NUVELA Table FigNUVEL A cm/year Fig Seno et al

10 Mariko SATO, Hiroshi MATSUSHITA, Masayuki FUJITA and Arata SENGOKU Fig Table Fig NUVEL A cm/year SLR NUVELA NUVELA ITRF ITRFSLR rescaled NUVELA NUVELA NUVELA Table FigNUVEL A cm/year Fig Seno et al Fig Velocity vectors of Simosato station relative to the Eurasian plate. The solid arrow shows our result and the open arrow shows the velocity vector estimated from Sengoku. cm/year Table Torrence ASIL Luceri and Bianco LAGEOS SLR Sengoku AJISAI SLR ITRF ITRF SLR rescaled Altamimi et al., SLR/VLBI/GPS/DORIS Sengoku AJISAI SLR LAGEOS cm/year cm/year ITRF ITRF SLR rescaled LAGEOS ASIL 10

11 Re estimationofthevelocityofsimosatofromanalysisoflageosslrdata Table Velocities of Simosato station by other researches. Changchun Beijing Shanghai NUVELA cm/year Heki et al., Arequipa NUVEL Acm /year NUVELA cm/ year Arequipa SLR ITRF ITRF SLR rescaled LAGEOS SLR cm/year Sengoku SLR GPS SLR LAGEOS LAGEOS SLR NASA/GSFC GEO- DYN II/SOLVE AJISAI LAGEOS SLR LAGEOS SLR 11

12 Mariko SATO, Hiroshi MATSUSHITA, Masayuki FUJITA and Arata SENGOKU cm /year SLR Altamimi, Z., X. Collilieux, J. Legrand, B. Garayt, and C. BoucherITRFA new release of the International Terrestrial Reference Frame based on time series of station positions and Earth Orientation Parameters,J.Geophys. Res., 112 B doi /JB Boucher, C., Z. Altamimi, P. Sillard, and M Feissel VernieThe ITRFIERS Technical Note,31 DeMets, C., R. G. Gordon, D. F. Argus, and S. Stein Effect of Recent Revisions to the Geomagnetic Reversal Time Scale on Estimates of Current Plate Motions, Geophys. Res. Lett., 21 Eddy, W. F., J. J. McCarthy, D. E. Pavlis, J. A. Marshall, S. B. Luthke, L. S. Tsaoussi, G. Leung, and D. A. WilliamsGEODYN II System Operations Manual,Vol.1-5 Contractor Report, ST Syst.Corp., Lanham, Md. NASA GEODYN II GEODYN II/SOLVE GDIS SLR Hedin, A. E MSIS Thermospheric Model, J.Geophys.Res.,34 Heki, K., S. Miyazaki, H. Takahashi, M. Kasahara, F. Kimata, S. Miura, N. Vasilenco, A. Ivashchenco and K. AnThe Amurian plate motion and current plate kinematics in Eastern Asia, J. Geophys. Res., 104. Luceri, V. and G. BiancoEarth Orientation and site coordinates/velocities from the Matera Space Geodesy Center solution ASIL,http : //geodaf.mt.asi.it/html_old/asimed/solution.html. aslr b SLR McCarthy, D. D.IERS ConventionsIERS TechnicalNote,21 Sengoku, AA plate motion study using Ajisai SLR data.,earthplanetsspace,50 Sengoku, A, M. Fujita, K. Matsumoto, K. Terai,and M. SasakiDetermination of Precise Positions of the Mainlands and Isolated Islands in the Japanese Territory A Review of Marine Geodetic Control Network Deployed by the Hydrographic DepartmentRep.Hydrogr.Res.,35 LageosI LageosII long arc Seno, T., S. Stein, and A. E. GrippA Model for the Motion of the Philippine Sea Plate Consistent with NUVELA and Geological Data,J.Geophys. Res.,98 Smith, D. E., R. Kolenkiewicz, P. J. Dunn, and M. H. TorrenceThe measurement of fault motion by satellite laser ranging,tectonophysics,52 Tapley, B. D., B. E. Schutz, and R. J. EanesStation coordinates, baselines, and Earth rotation from LAGEOS Laser Ranging J. Geophys. Res.,90. Tapley, B. D., D. P. Chambers, S. Bettadpur, and J. C. RiesLarge scale ocean circulation from the GRACE GGMgeoid. Geophys. Res. Lett., 30 doi /GL Torrence, MTectonic Plate Motion, http : // cddisa.gsfc.nasa.gov/ /slrtecto.html. Ullman, R. E.SOLVE Program,NASAContract Report NAS Task 12

Fig. 1. Horizontal displacement of the second and third order triangulation points accompanied with the Tottori Earthquake of (after SATO, 1973)

Fig. 1. Horizontal displacement of the second and third order triangulation points accompanied with the Tottori Earthquake of (after SATO, 1973) Journal of the Geodetic Society of Japan Vol. 27, No. 3, (1981), pp. 183-191 Research on Fault Movement by means of Aero-Triangulation ( T) (An experiment on the earthquake fault of the Izu-Oshima Kinkai