Automatic picking of the first arrival event using the unwrapped-phase of the Fourier transformed wavefield

Yun Seok Choi*, Tariq Alkhalifa, Christos Saragiotis, King Abdullah

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

First-arrival picking has long suffered from cycle skipping, especially when the first arrival is contaminated with noise or have experienced complex near surface phenomena. We propose a new algorithm for automatic picking of first arrivals using an approach based on unwrapping the phase. We unwrap the phase by taking the derivative of the Fourier-transformed wavefield with respect to the angular frequency and isolate its amplitude component. To do so, we first apply a damping function to the seismic trace, calculate the derivative of the wavefield with respect to the angular frequency, divide the derivative of wavefield by the wavefield itself, and finally take its imaginary part. We compare our derivative approach to the logarithmic one and show that the derivative approach does not suffer from the phase wrapping or cycle-skipping effects. Numerical examples show that our automatic picking algorithm gives convergent and reliable results for the noise-free synthetic data and noisy field data.

Original languageEnglish (US)
Title of host publicationSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011
PublisherSociety of Exploration Geophysicists
Pages1653-1657
Number of pages5
ISBN (Print)9781618391841
StatePublished - Jan 1 2011
EventSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011 - San Antonio, United States
Duration: Sep 18 2011Sep 23 2011

Publication series

NameSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011

Conference

ConferenceSociety of Exploration Geophysicists International Exposition and 81st Annual Meeting 2011, SEG 2011
CountryUnited States
CitySan Antonio
Period09/18/1109/23/11

ASJC Scopus subject areas

  • Geophysics

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