地震工程学报2017，Vol.39Issue(2)：268-277,10.DOI:10.3969/j.issn.1000-0844.2017.02.0268
甘东南地区基于射线追踪面波频散三维成像
Direct Inversion of Surface Wave Dispersion for Three-dimensionalShallow Crustal Structure Based on Ray Tracing inSoutheastern Area of Gansu Province
郭瑛霞 1张元生 1颜文华 1魏从信 1秦满忠1
作者信息
- 1. 中国地震局兰州地震研究所,甘肃 兰州 730000
- 折叠
摘要
Abstract
We used the vertical component of data from 62 flow stations recording continuous background noise to determine the possible interaction of surface-wave-related functions and Rayleigh-wave-phase velocity dispersion curves in southeastern Gansu (32.2°~33.5°N, 102.7°~105.5°E).We used the ray-tracing surface-wave-dispersion direct inversion method for five observation stations within a 20-km shear wave velocity distribution image depth range.The results show that there is a correlation between shear wave velocity corresponding to a 5-km depth and lateral variations in the thickness distribution of the deposited layer in the surface fault zone.In addition, the northern West Qinling fault zone is mostly a low-speed zone.Also, the Zhangxian and Lintao Basins belong to one type of characterization of the deposited thick layer (the last a few kilometres).About a 10-km depth corresponds to the shear wave velocity in the south margin fault of Lingbei Xiqin.The Lintan-Dangchang fault in the Lixian-Luojiabao area is between the low-fracture velocity zone, with light covered mountains-stacked high speed around the Northern Piedmont fault zone.There is a block structure of high and low rendering features near the Diebu-Bailong River Ling fault at about a 15-km depth.At about a 10~18-km depth range, the speed gradually increases with depth and the magnitude of the change is about 0.2 km/s.关键词
背景噪声/互相关函数/射线追踪/瑞利面波层析成像Key words
ambient noise/cross correlation function/ray tracing/rayleigh wave tomography分类
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郭瑛霞,张元生,颜文华,魏从信,秦满忠..甘东南地区基于射线追踪面波频散三维成像[J].地震工程学报,2017,39(2):268-277,10.
