Crustal strains in the Japanese islands as deduced from dense GPS array

Details Crustal strains in the Japanese islands as deduced from dense GPS array Crustal strains in the Japanese islands as deduced from dense GPS array

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3445k&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 18, p. 3445-3448

Physics

31

Geodesy And Gravity: Crustal Movements-Intraplate, Geodesy And Gravity: Seismic Deformations, Geodesy And Gravity: Space Geodetic Surveys, Seismology: Seismic Hazard Assessment And Prediction

Scientific paper

Data from the nationwide continuous GPS network, operated by the Geographical Survey Institute of Japan, were used to estimate crustal strains in the Japanese islands. We used horizontal velocity vectors at 610 sites for the period April, 1996 to March, 1997, and employed the Least Squares Prediction method to interpolate the velocities to a uniform 7km×7km grid over Japan. The gridded velocities were then differentiated space to calculate principal components of strains. Results clearly portray tectonic strainings of the Japanese islands in one year; (1) Dilatational strains show that the Japanese islands are under a compressive strain regime induced by the subducting oceanic plates, (2) Distribution of high maximum shear strains coincides with the regions of crustal activities, and (3) Principal axes of the strains indicate influences of E-W and NW-SE compression due to the converging oceanic plates. North-south extension in Kyushu is also visible.

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