|Table of Contents|

Study on Parameter Simplifying in Dispersion Curves Inversion of Surface Wave Based on Subdividing Layer Method(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第03期
Page:
317-320
Research Field:
应用地球物理
Publishing date:

Info

Title:
Study on Parameter Simplifying in Dispersion Curves Inversion of Surface Wave Based on Subdividing Layer Method
Author(s):
SHAO Guang-zhou1; 2; LI Qing-chun1; 2
1. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China; 2. School of Geological Engineering and Surveying, Chang'an University, Xi'an 710054, Shaanxi, China
Keywords:
surface wave;  dispersion curve;  subdividing layer;  inversion;  shear velocity;  rayleigh wave
PACS:
P631
DOI:
-
Abstract:
Such parameters as layer numbers, thickness and velocity of each layer need to be modified constantly in the conventional inversion of dispersion curves, and the realization process is relatively troublesome. Aiming at this disadvantage, a subdividing layer method to inverse the dispersion curves of surface wave is introduced. The detailed thought is as follows: according to the depth of objective layer(such as 20 m), the underground media will be subdivided into several thin layers(20 layers)with the thickness of 1 m and a half space layer(totally 21 layers). Then the numbers and thickness of layers are known variables in the inversion, only shear velocities need to be modified in calculation, so the inversion process is greatly simplified. The forward and inversion results indicate that the dispersion curve computed by subdividing layer method is equivalent with that by actual layer; the result inversed by subdividing layer method is similar with that by actual model. The results show that the subdividing layer method is feasible and effective in dispersion curves inversion; the underground media are subdivided into several thin layers with the thickness of 1 m, and each thin layer could get a shear velocity after inversion, so that the inversion resolution could reach; because the actual velocity of underground media changes gradually with the depth increasing, subdividing layer is more close to the actual situation than the conventional layer with the inflexion of dispersion curve(the thickness of each layer may be several meters, and the shear velocity was equal in the same layer).

References:

[1] Xia J H,Miller D,Park C B.Estimation of Near-surface Shear-wave Velocity by Inversion of Rayleigh Waves[J].Geophysics,1999,64(3):691.
[2] 李庆春,邵广周,刘金兰,等.瑞雷面波勘探的过去、现在和未来[J].地球科学与环境学报,2006,28(3):74-77.
[3] 邵广周,李庆春,梁志强.液体表层层状介质导波频散曲线研究[J].地球物理学报,2007,50(3):915-920.
[4] Shao G Z,Li Q C,Li J G.Surface Wave Extracting from Reflection Seismic Data and Structure Imaging of Shallow Seafloor[C]∥Wang X B.Near-surface Geophysics and Human Activity.North Brunswich:Science Press USA Inc,2008:186-190.
[5] 肖柏勋.高模式瑞雷面波及其正反演研究[D].长沙:中南大学,2000.
[6] 杨成林.瑞雷波勘探[M].北京:地质出版社,1993.
[7] 辛小春.面波新技术在工程地质勘察场地评价中的应用[J].北京水利,2003(1):25-26.
[8] 孙 渊,吴 迪,张 良,等.弹性波法在水库坝基检测中的应用[J].长安大学学报:地球科学版,2003,25(4):76-79.
[9] Miller R D,Xia J H,Park C B,et al.Multichannel Analysis of Surface Waves to Map Bedrock[J].The Leading Edge,1999,18(12):1392-1396.
[10] 卓乐芳.液体-固体分界面处斯通利波的波速方程[J].长安大学学报:地球科学版,2003,25(1):76-78.
[11] 胥 颐,刘福田,刘建华,等.中国大陆西北造山带及其毗邻盆地的地震层析成像[J].中国科学:D辑,2000,30(2):113-122.

Memo

Memo:
-
Last Update: 2011-09-20