Recent Crustal Movement Inferred from GPS Observation of Mt. Tateyama, Northern Alps, Central Japan

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1 Bull. Earthq. Res. Inst. Univ. Tokyo Vol. 2-,**2 pp. +3-,*+ GPS * +, - +, GPS : Recent Crustal Movement Inferred from GPS Observation of Mt. Tateyama, Northern Alps, Central Japan Ryosuke Doke *, Akira Takeuchi, Ken-ichi Yasue, Kazuya Hatamoto and Yuki Matsu ura +, Graduate School of Science and Engineering for Education, University of Toyama, Graduate - School of Science and Engineering for Research, University of Toyama, Nippon GPS Solutions Corporation, Present address: Japan Atomic Energy Agency +, Abstract We have performed GPS campaign observations at Jododaira, Tateyama Mountains, Northern Alps, central Japan, since From the result of +* years of observations, we detected remarkable crustal movement around the Tateyama Mountains. Jododaira station has moved toward WSW at.., *.. mm/yr and uplifted at -. 2 *. 0 mm/yr during the period form +330 to,**., with respect to the GEONET Toyama station that is assumed as fixed. The acceleration of horizontal movement at Jododaira station started from,***-,**+. A possible reason of the acceleration is the e# ect of slow slip event on the Tokai subduction zone, which started from,***. Key words: GPS observation, Hida Mountains, Mt. Tateyama, crustal movement + GPS GPS GEONET +,,**,**. +* Fig. + + Sagiya GPS +330 et al.,,*** GEONET,**. GPS +* GPS +* GPS GPS,**. GEONET 3/* * d *01+-*.@ems.u-toyama.ac.jp 3-* 2/// -+3* 193

2 Fig. +. Index map of Jododaira and GEONET stations used in this paper. Solid line (A-A ) indicates location of profile line in Fig. 0.,,**- +**. -,*** m GPS +331 ;,*** ,*** +33.,*** M / ,***,***,***; -,*** -0-- / ,+.,/ NE-SW NE-,, 2-3 m Fig. + ; SW NE- SW ++. m N-S Fig., Ashtech GP-R+ -Z+, Geodetic +33+ ;,**- -* NE-SW N-S + / Table ,**- 194

3 GPS Table +. Periods of the observations at Jododara station. Fig.,. Jododaira station for GPS observation. Arrow indicates the concrete pillar and GPS antenna. The wall at the back of photo is Tateyama Laboratory, University of Toyama.,,**. /. / /,.,.,**. /,**/ IGS GAMIT GLOBK TOPCON LEGACY-E LegAnt IGS Fig. -,**.,**- GEONET +/. km GEONET *2*2 +332,,**/ Ta-,**/ A ble,. / JODO /+ +330,**. GEONET Fig. GEONET + GEONET -/. *-. mm,/. *-. mm */11 *,.2 *,.3 Fig....- *.. mmyr *,/* *2*2 **.0 Fig.,**+ + International GNSS Service IGS Fig.. +3 Fig. - GEONET GAMIT +*., GLOBK -2. *1. mmyr Fig..,***,**- 1 2 GAMIT * GLOBK +, 195

4 Fig. -. Distribution of IGS stations for the present analysis. Table,. O# set of coordinates due to the antenna exchange of GEONET stations. */. +-. cm *,. */. cm Fig.. GEONET GEONET *2*2 GEONET **.0 GEONET Fig. / GEONET Fig ,**. GEONET GEONET 0 0+,/. *-. mmyr,-. *.. mmyr GEONET /2. */. mmyr GPS /.. *.. mmyr 0/. +-. mmyr mmyr /, GPS GEONET Fig. 0 *2*2 +330,**. GEONET * yr -. 2 *. 1 mmyr +332,**. 196

5 GPS Fig... Time series at Jododaira station. GEONET Toyama station is fixed. Horizontal and vertical components and baseline length are shown ; (a) Northward, (b) Eastward, (c) Upward,and (d) Baseline length, respectively. 0/. +-. mmyr mmyr,*** +**,**- GPS 0,,***,**+,**.,***,**+ 197

6 Fig. /. Time series at GEONET Tateyama station. GEONET Toyama station is fixed. Horizontal and vertical components and baseline length are shown ; (a) Northward, (b) Eastward, (c) Upward and (d) Baseline length, respectibely.,**/ GEONET Fig..,*** Ozawa et al.,,**, GEONET Ozawa et al.,,**, 198

7 GPS Fig. 0. GPS velocity profiles from the southern Noto Peninsula through Toyama plain and Hida mountains to Matsumoto Basin. (a) Northward. (b) Eastward. (c) Upward and (d) Height components, respectively. Solid circles indicate the velocities estimated for the period from +330 to,**.. Gray circles indicate the velocities estimated for the period from +332 to,**., when the observation data for all stations are available. Open circles are the fixed site (GEONET Toyama station). Profile line is shown in Fig. + (A-A ).,**/ +33*,** Fig.. +33* +33* +332 dhdt dedt r r dedt h E t r r 0-,**0 199 m c m c

8 - / mmyr +333 r,. 1,,. 3, - - gcm r -. -, gcm Dziewonski et al., +31/ m c,/.... GPS mmyr GAMIT -2. *0. mmyr GAMIT GPS +* +** GEONET International GPS GNSS Service GMT Wessel and Smith, Dzeiwonski, A.M., Hales, A.L. and Lapwood, E.R., +31/, Parametrically Simple Earth Model Consistent with Geo- physical Data. Phys. Earth Planet. Inter., +*, +, / 2/ GPS,+ 0*-0*1. +33* ,**. GEONET /,.,***.-. *.. mmyr *0. mmyr +, G-/ /* 03. GEONET,**- // -23.* ,,***,**+,**/ ,,1.,**1 12,.1-*-.,**0 - / -3,.,**. GPS /1,*3,-+. Ozawa, S., Murakami, M., Kaidzu, M., Tada, T., Sagiya, T., Hatanaka, Y., Yarai, H. and Nishimura, T.,,**,, Detection and Monitoring of Ongoing Aseismic Slip in the Tokai Region, Central Japan, Science,,32, +**3 +*+,.,**-,/ 3+23,2. Sagiya, T., Miyazaki, S. and Tada, T.,***, Continuous GPS Array and Present-day Crustal Deformation of Japan, Pure Appl. Geophys., +/1,,-*-,-,,. GPS,*** GPS 200

9 GPS +, G-/ +, G-/ +2, Wessel, P. and Smith, W.H.F., +332, New, improved version +331 GPS +33, +330 of the Generic Mapping Tools Released, AGU, 13, /13. EOS Trans. /+,3,,33. (Received December +.,,**1),*** +332 (Accepted September,.,,**2) 201