Horizontal Strain of the Crust in Korea inferred from Geodetic Data

Abstract

Changes in the horizontal crustal strain in Korea have been derived from the survey data of new precise geodetic networks, and those of the old triangulation made in 1910—1915. The mean rate of the maximum shear strain is 0.12 μ /yr. This rate is about one third of that in Japan, and its spatial distribution is consistent with the seismicity in Korea.The mean direction of principal axes of the compression is about N 80° E. This direction is well accordant with the P-axis distribution of the focal mechanisms of earthquakes in this region. Dilatation has not been calculated because of the scale error between the two surveys. © 1997, The Geodetic Society of Japan. All rights reserved.