文章基本信息

标题：GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake ( M JMA 8.0), off southeastern Hokkaido, Japan
本地全文：下载
作者：Hiroaki Takahashi ; Shigeru Nakao ; Noritoshi Okazaki 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2014
卷号：56
期号：3
页码：377-382
DOI：10.1186/BF03353068
出版社：Springer Verlag
摘要：To investigate the postseismic crustal deformation associated with the Tokachi-oki earthquake ( M JMA = 8.0) of 26 September 2003 in Japan Standard Time (JST), off southeastern Hokkaido, Japan, we newly established thirty GPS sites just after the mainshock in the eastern part of Hokkaido. Rapid data analysis for one month after the mainshock clearly indicated postseismic displacements only in the horizontal components. Observed maximum horizontal displacement was 6.6 cm from 28 September to 24 October, 2003. Absence of the vertical suggests that afterslip occurred in and around the coseismic fault rather than at downdip extension. Time series of coordinates are characterized by logarithmic decay functions with 4–11 days relaxation times. This suggests that postseismic deformation was due to afterslip on the fault following the large earthquake.