Geodynamics and Geoid Height Researches in Japan Applying the Global Positioning System Measurements.

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  • GPSの国内におけるgeodynamicsとgeoid高研究べの応用
  • GPSの国内におけるgeodynamicsとgeoid高研究への応用〔英文〕
  • GPS ノ コクナイ ニ オケル geodynamics ト geoid コウ

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Abstract

We review the GPS measurements that have been applied to geodynamic and geoid height research in Japan. In the Nansei-shotou GPS network extending across the Ryukyu trench, the relative motion of the Philippine Sea and Eurasian plates were detected, with a convergence rate of 87±31 mm/yr and a direction of N70±30°W. In central Japan, applying a GPS fixed-point network, the instantaneous deformations during the 17 months (April 1988-August 1989) were measured. Relative to the Eurasian plate, westward motion of 28 mm/yr of a site at the northern tip of the Philippine Sea plate was detected, with southwestward motion of 18 mm/yr at a site located at the southeastern tip of the Eurasian plate. At a site inland of the Tokai district, vertical uplift with a velocity of 20 mm/yr is suggested in the Akaishi uplift zone. Baselines across Suruga Bay were observed to be continuously shortening with a rate of 16 mm/yr at the entrance to the bay and at a smaller rate inside the bay. In the seismic swarm and submarine eruption that occurred in July, 1989, east of the Izu Peninsula, a significant crustal extension of 145 mm of the 10-km baseline was detected only at the period of peak swarm activity. Geoid height was determined with an accuracy of 80-100 mm in the Kinki district and the southern Hokkaido region .

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