1887
Volume 22 Number 3
  • E-ISSN: 1365-2478

Abstract

A

Results of studies carried out with the help of a three‐dimensional seismic model on waves diffracted from edges of varying radius of curvature and depth with respect to wave length λ are described. The amplitude decay, travel time, and apparent velocity of the wave diffracted from a sub‐surface edge of semi‐infinite length are found to depend on the parameters , and distance from the edge on the surface provided the ratio of the parameters to λ are less than some limiting values. The nature of the amplitude decay is independent of when the depth exceeds 2λ, and independent of when exceeds 1.5λ. When these are below the limiting values (= 2λ and = 1.5λ), the nature of the decay depends appreciably on and The apparent decay in amplitude on the surface due to geometrical spreading by the diffracting edge is less than that of a cylindrical secondary wave source and decreases with increase in depth of the edge. The nature of the travel time curves of the diffracted waves near the edge depend on /λ when the depth is within about one λ. Apparent velocity of the wave depends largely on /λ in the zone of diffraction up to a distance of about one λ from the edge on the surface. Beyond this distance the velocity is almost the same irrespective of /λ and depend only on /λ. The width of the zone of diffraction caused by an edge of finite length comparable to λ is more and more narrow as the ratio of the distance of the edge on the surface to its depth increases.

Loading

Article metrics loading...

/content/journals/10.1111/j.1365-2478.1974.tb00104.x
2006-04-27
2024-03-29
Loading full text...

Full text loading...

References

  1. Angona, F. A., 1960, Two dimensional modelling and its application to seismic problems, Geophysics25, 468–482.
    [Google Scholar]
  2. Datta, S. and Bhowmick, A. N., 1969, Head waves in two dimensional seismic models, Geophysical Prospecting17, 419–432.
    [Google Scholar]
  3. Harper, D. R., 1965, Observed reflection and diffraction wavelet complexes in two‐dimensional seismic model studies of simple faults, Geophysics30, 72–86.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journals/10.1111/j.1365-2478.1974.tb00104.x
Loading
  • Article Type: Research Article

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error