Japan Geoscience Union Meeting 2014

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Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS33_30AM2] Crustal Deformation

Wed. Apr 30, 2014 11:00 AM - 12:45 PM 315 (3F)

Convener:*Masayuki Murase(Department of Geosystem, College of Humanities and Sciences, NIHON University), Yusaku Ohta(Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University), Chair:Masayuki Murase(Department of Geosystem, College of Humanities and Sciences, NIHON University), Takeo Ito(Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University)

11:15 AM - 11:30 AM

[SSS33-09] Continuous GPS observation in northern part of Nansei Islands

*Shigeru NAKAO1, Hiroshi YAKIWARA2, Shuichiro HIRANO2, Kazuhiko GOTO2 (1.GSSE, Kagoshima Univ., 2.NOEV, Kagoshima Univ.)

GEONET, which is a nationwide GPS observation in Japan cover on all over Japan. However, there is a GEONET site in Toshima-mura which is located in northern part of Nansei Islands. This region is defined the boundary between Northern and Central part of Ryukyu arc (Nishimura et al., 2004). It is not clear that where is the boundary because there is almost no GPS site. Goto (2013) concluded that the great earthquake occurred in 1911 is the interpolate event in this region. We set up the continuous GPS in islands of this region due to observe crustal deformation in this region.In Akuseki Island (AKSK), Takarajima (TAKR) and Kuchinoshima (KCHI), continuous GPS (CGPS) observation started in March 2007, July 2007 and September 2010, respectively. CGPS set up on Gajyajima (GJYA) and Ujishima (UJIS), where is a deserted island, in May 2009. CGPS in Yokoatejima (YKAT) started in September 2013. Data is recorded at CGPS sites. Electric power system at GJYA, UJIS and YKAT is composed of batteries and photovoltaic cells.Bernese GPS Software ver. 5.0 are used with IGS precise ephemerides and IERS rotation parameters. We also estimated tropospheric delays every hour and their horizontal gradients every six hours.The short-term repeatabilites are from 1.6 to 3.0 mm in horizontal component and from 6.5 to 7.9 mm in vertical components. These observation is expected to make contribution to resolve rigid movement and crustal deformation in this region.