New alternative to the methods typically applied in seismic tomography

سال انتشار: 1382
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,553

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شناسه ملی سند علمی:

SEE04_SI13

تاریخ نمایه سازی: 10 آبان 1384

چکیده مقاله:

The seismic data observed for tomography studies posses a resolving power limited to rather large-size structures. A large anomaly surrounded by a uniform zone or neighboring large inhomogeneities can give a reason for the ambiguous results. The standard methods including the Lanczos process (or LSQR algorithm) may overcome this difficulty by using different grid or modifying the sources and receivers distribution. Another important problem is a possible restriction for the seismic experiment caused for instance by marine conditions. Then the ordinary methods poorly reconstruct both large and small-size structures. On the base of optimal selection of iterative parameters, the algebraic technique is proposed to improve the resolution of complicated structure, in particular, for the case of the insufficient independent observations. In local earthquake tomography this method was developed by author as the travel time tomography inversion and named by the Method for the Consecutive Subtraction of Selected Anomalies (CSSA). This paper describes the CSSA calculating scheme in such a way that it could be useful for application to any linear inverse problem arising in seismology or in other branches of geophysics. The paper also outlines the main differences between the CSSA algorithm and the Lanczos method. On each iteration step, the parameter that is most responsible for the smallest lsq functional is analyzed. Then the corresponding solution is selected, if this parameter is consistent with the resolution criteria advanced. A distinctive feature of the proposed technique is relative freedom in the selection of the starting vector for inversion. Iterative parameters are able to account the quality of the starting approximation and the resolution can be improved using the appropriated vector. It is concluded that the described CSSA alternative can be extended to solve general inverse problem with different data sets

نویسندگان

T. A. Smaglichenko

United Institute of Physics of the Earth, Moscow, Russia

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  • K.Aki, A. C h ristoffersson, E. S. Husebye (1976).، ،Three- ...
  • N. P. Bahvalov, Jidkov, G. M. Kobelkov (1987).، Numerical Methods?, ...
  • time and amplitude analysis in Travelء، .(1989) N. D. Bregman, ...
  • A. S. Householder (1953). *Principles of Numerical Analysis. Mc Graw-Hil ...
  • A. de la Garza (1951). ?An Iterative method for Solving ...
  • C. Lanczos (1961).، Linear Differential Operators' , Chap.3, Van Nostrand, ...
  • J. J. Leveque, L. Rivera, G. Wittlinger (1993). _ the ...
  • G. Nolet (1985). *Solving or resolving inadequate and noisy tomographic ...
  • C. C. Paige, M. A. Saunders (1982). *LSQR: An Algorithm ...
  • T. A. S _ aglichenko, S. Horiuchi, A. Hasegawa., A. ...
  • T. A. S maglichenko _ W. R. Jacoby, H. Wallner, ...
  • T. A. Smaglichenk _ W.R. Jacoby, H. Wallner (2000). *Tomography ...
  • CSV A Tomography Technique: Presentation and Comparison Theء، .(2001) T. ...
  • T. A. S maglichenk _ A. V. Nikolaev, S. Horiuchi, ...
  • A. Van der Sluis, H.A. Van der Vorst (1987).، Numerical ...
  • C. Tompkins (1949). ;Projection Methods in Calculation of Some Linear ...
  • D. K. Faddeev and V. N. Faddeeva (1963). _، C ...
  • نمایش کامل مراجع