现代地质Issue(6)：1243-1251,9.
IRS-P5影像提取 DEM 技术在大青山山前断裂古地震研究的应用
Application of DEM Extracted from IRS-P5 Stereo Images on Paleo-Earthquake Study of Daqingshan Piedmont Fault
摘要
Abstract
A case DEMwas extracted from IRS-P5 stereo images of middle three segments (Tuyou,Tuzuo and Bikeqi)in Daqingshan piedmont fault,and this DEM’s vertical accuracy was tested to meet hilly-area and mountainous-region requirement of 1∶10,000 topographic maps.Twenty-five gullies across the fault on the foot-wall have been extracted from this DEM,and the knickpoints caused by fault activities in Holocene have further been extracted from profiles of gullies,and the six-,five-and three-ranks of knickpoints are identified in the gullies from west to east.The newest rank knickpoints in the Tuyou and Tuzuo segments are regarded as those caused by the A.D.849 earthquake to get their retreat rates.The retreat rate of the newest knickpoint in each gully is also considered as that of other points in the same gully;the average retreat-rate value of the newest rank knickpoints in the Tuyou and Tuzuo segments is considered as that of the knickpoints in the Bikeqi seg-ment;then the formation time of the six-,five-and three-ranks of knickpoints in the three segments is computed combining with the retreat distances of knickpoints on the gullies,thus the paleo-earthquake series in the study area in Holocene have been obtained.These paleo-earthquake series are close to the results that are derived from trench techniques and Holocene paleosols in paleo-alluvial-pluvial fans in previous studies.关键词
IRS-P5/大青山山前断裂/DEM/裂点/古地震Key words
IRS-P5/Daqingshan piedmont fault/DEM/knickpoint/paleo-earthquake分类
天文与地球科学引用本文复制引用
何仲太,侯建军,宿渊源..IRS-P5影像提取 DEM 技术在大青山山前断裂古地震研究的应用[J].现代地质,2014,(6):1243-1251,9.基金项目
中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项项目（ZDJ2012-01，ZDJ2010-10）。 （）
