Distribution of vertical crustal movement rates in the Tohoku district, Japan, predicted by least-squares collocation |
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Authors: | G S El-Fiky Teruyuki Kato Yoichiro Fujii |
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Institution: | (1) Earthquake Research Institute, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113, Japan Fax: 813 5689 7234, e-mail: el-fiky@eri.u-tokyo.ac.jp, JP;(2) Department of Earth Science, Ibaraki University, 2-1-1 Bunkyo-cho, Mito, Japan, JP |
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Abstract: | Least-squares prediction using an empirically deduced local covariance function was performed to investigate the temporal
change in the rates of vertical crustal movements in the Tohoku district, Japan. Levelling data covering an area of approximately
450 × 275 km2 observed between 1966 and 1995 were used and the results shown in the form of contour maps. Firstly we derived a covariance
function of the rates of vertical crustal movement with a Gaussian form function. We used this function to estimate the spatial
distribution of the rates of vertical crustal movements. By the present method, a steady tilt of the Tohoku district to the
east, toward the Japan Trench and an areal uplift in the southwestern part were well reproduced. Moreover, a significant temporal
change in vertical movement rates is clearly seen.
Received: 15 July 1996 |
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Keywords: | , Least-squares collocation ,, ,Prediction ,, , Vertical crustal movements |
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