地震工程学报2025，Vol.47Issue(3)：690-699,10.DOI:10.20000/j.1000-0844.20250126004
麦积山石窟近场活动断裂潜在地震变形研究
Potential seismic deformation of the Majiishan Grottoes induced by near-field active faults
摘要
Abstract
Multiple active faults are developed in the near field of the Majiishan Grottoes,with the northern margin fault zone of the West Qinling Mountains historically posing the greatest seismic threat.To investigate the impact of near-field seismogenic faults on the Majiishan grottoes,the seismic geological conditions and potential seismic hazards of the northern margin fault zone of the West Qinling Mountains were analyzed in this study.Combining the elastic dislocation theory and the three-dimensional finite element numerical simulation,the displacement and strain distri-bution patterns on the surface of the Majiishan Grottoes area during left-lateral strike-slip activi-ties along the Tianshui—Baoji segment of the northern margin fault zone of the West Qinling Mountains under M7.0 and M7.5 earthquakes were examined.The results reveal that seismic deformation of the Tianshui—Baoji fault is dominated by horizontal shear,with localized seconda-ry vertical deformation.Higher magnitudes significantly increase the magnitude and spatial extent of displacement and strain.In the Majiishan Grottoes area,seismic displacement,normal strain,and shear strain increase with the increase of magnitude.The southeastern direction of the grot-toes exhibits the most critical displacement under future earthquakes,with shear strain posing the primary risk for potential rock mass dislocation or localized shear failure.Additionally,fault plane dimensions influence computational results:surface deformation stabilizes when the fault plane depth reaches 15 km,which can serve as a reference value for seismic simulations of the Tianshui—Baoji fault.This study provides critical insights for seismic risk assessment and miti-gation of the Majiishan Grottoes.关键词
麦积山石窟/西秦岭北缘断裂/形变场特征/地震变形Key words
Majiishan Grottoes/northern margin fault of the West Qinling Mountains/deforma-tion field characteristics/seismic deformation分类
天文与地球科学引用本文复制引用
亓绚薇,赖天文,石玉成,梁庆国..麦积山石窟近场活动断裂潜在地震变形研究[J].地震工程学报,2025,47(3):690-699,10.基金项目
国家自然科学基金区域创新发展联合基金项目(U22A20599) （U22A20599）
