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AGU: Geophysical Research Letters

 

Index Terms

  • Exploration Geophysics: Data processing
  • Seismology: Body wave propagation
  • General or Miscellaneous: Techniques applicable in three or more fields

Abstract

A numerical study on finding an optimum model in velocity tomography by using the extended information criterion

O. Nishizawa

Geological Survey of Japan, Higashi 1–1–3, Tsukuba, Ibaraki 305, Japan

Xing‐lin Lei

DIA Consultant Co. Ltd., Ikebukuro 3–1–2 Toshima, Tokyo 171, Japan

We performed numerical experiments to show that Extended Information Criterion (EIC) can be utilized for determining an optimum model in velocity reconstruction problems, in which a wavefront tracing method was employed for finding the minimum travel time raypath. First, travel times were calculated from a specified velocity model, and simulated data were produced by adding random error to the travel times. Velocity models were then reconstructed from the simulated data by employing a Simultaneous Iterative Reconstruction Technique (SIRT) starting from different initial models. Finally, EIC values were calculated for each reconstructed velocity model at every iteration, and were used for selecting an optimum velocity model. Results indicated that EIC provides an objective method for selecting an optimum solution from a suite reconstructions obtained from different initial models.

Received 3 November 1994; accepted 7 March 1995; .

Citation: Nishizawa, O., and X. Lei (1995), A numerical study on finding an optimum model in velocity tomography by using the extended information criterion, Geophys. Res. Lett., 22(10), 1313–1316.

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