期刊名称：Bulletin of the Geographical Survey Institute
印刷版ISSN：0373-7160
出版年度：2016
卷号：64
页码：21-26
出版社：Geographical Survey Institute / Ministry of Land, Infrastructure and Transport
摘要：SAR interferometry (InSAR) analysis of operational L-band SAR satellite of Japan, ALOS-2, reveals a seriesof coseismic crustal deformations caused by the 2016 Kumamoto Earthquake (April 14-16, 2016). Large coseismicdeformation of over 10 centimeters due to the two large foreshocks and over 2 meters due to the mainshock canbe clearly identified on the SAR interferograms as well as postseismic deformation up to a few centimeters. Thesedisplacements are concentrated around Futagawa-Hinagu fault zone which is a known active fault in Kyushu Island.2.5-D displacements, more specifically quasi-east-west and quasi-vertical displacements due to the mainshock arealso estimated from two interferograms observed from both east and west directions. The estimated displacements areconsistent with those of ground GNSS observations. The sequence of the earthquakes causes significant distortion in thegeodetic datum of Japan around the focal area, and thus positions of geodetic control points, which are fundamentalinfrastructure for implementing the datum needed to be revised as soon as possible. The area of the deformationcould be promptly identified from the interferograms, and the control points which needed to be revised were quicklydetermined from the interferograms without any additional ground observation
