What is nmo stretch

For use with OBN data or deep tow slant cable data prior to any receiver redatuming. Stretch Method: Choose the stretch processing. No stretch processing does nothing, Use stretch mute performs a stretch mute using the sample stretch cut-off, Use stretch limit limits the NMO stretch to the cut-off value. Cut-off samples : If applying a stretch mute the amount of stretch beyond which a sample will be muted. If using a stretch limit, this is the maximum value of stretch.

Ramp ms : If applying a stretch mute, the length of the linear mute ramp. In this instance the following four inputs are required: a velocity model V pick the nominal picking azimuth from which those velocities were derived the azimuth of the fast direction the ellipticity of the velocity.

Generalised Corrigan equation. Anisotropic azimuthal 2nd order equation. Anisotropic azimuthal 4th order equation. Reference Corrigan, D. Image Gather Processing. Institutional Sign In. Sign In or Create an Account. User Tools. Sign In. Advanced Search. Skip Nav Destination Article Navigation. Close mobile search navigation Article navigation. Volume 57, Number 5. Previous Article. Article Navigation. Other May 01, Barnes Arthur E. Google Scholar.

Geophysics 57 5 : — Article history first online:. Abstract The normal moveout NMO correction is applied to seismic reflection data to transform traces recorded at non-zero offset into traces that appear to have been recorded at zero offset; this introduces undesirable distortions called NMO stretch Buchholtz, Fatti J.

Preserving far offset seismic data using non-hyperbolic moveout corrections , SEG Expanded Abstracts , 9 , — Masoomzadeh H. Barton P. Singh S. Nonstretch moveout correction of long-offset multichannel seismic data for subbasalt imaging, Example North Atlantic , Geophys.

Mann J. Hoecht G. Google Preview. Miller R. Normal moveout stretch mute on shallow-reflection data , Geophysics , 57 , 11 , — Noah J. Perroud H. Tygel M. Nonstretch NMO , Geophysics , 69 , 2 , — Rupert G. Chun J. The block move sum normal moveout correction , Geophysics , 40 , 01 , 17 — Taner M. Koehler F.

Sheriff R. Complex seismic trace analysis , Geophysics , 44 , 6 , — Velocity spectra-digital computer derivation and application of velocity functions , Geophysics , 34 , — Chopra S. Oxford University Press is a department of the University of Oxford. It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide. Sign In or Create an Account. Sign In. Advanced Search. Search Menu.

Article Navigation. Close mobile search navigation Article Navigation. Volume Article Contents Summary. The local stretch zeroing lsz method. The added value of the lsz method. Real and synthetic seismic data examples. Local stretch zeroing NMO correction. Kazemi , N. E-mail: nnojadeh ut. Oxford Academic. Cite Cite N. Select Format Select format. Permissions Icon Permissions. Time series analysis , Image processing , Numerical approximations and analysis.

Open in new tab Download slide. Because reflection events will interfere with each other at offsets beyond the X max , the X max is in fact limiting offset for non-stretched correction and full recovery of a reflection event by the LSZ method.

However, beyond the X max , although the wavelet will be corrected with no stretching, the method will drop some of the data samples from the tail of the wavelet i. This will in fact prevent destructive effects of the interfered data samples on stacked trace. As a result, for each reflection event in the LSZ method, corresponding X max is the onset of its mute zone. This optimally selected offset for muting is an advantage of the method. For non-stretch correction of a reflection event with dominant period of T i , the LSZ method requires that zero-offset width of the time gate, i.

As indicated in Fig. By substituting and in terms of corresponding zero offset and NMO times, eq. Picked velocities for synthetic CMP gather. Google Scholar Crossref.