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Title

Frequency-dependent phase coherence for noise suppression in seismic array data

AuthorsSchimmel, Martin ; Gallart Muset, Josep
KeywordsSeismograms
Phase stack
Coherence
Seismic noise
Arrays
Analytic signal
Issue DateMar-2007
PublisherAmerican Geophysical Union
CitationJournal of Geophysical Research - Part B - Solid Earth 112(B4): B04303 (2007)
AbstractWe introduce a coherence measure for seismic signal enhancement through incoherent noise attenuation. Our processing tool is designed for densely spaced arrays and identifies signals by their coherent appearance. The approach is based on the determination of the lateral phase coherence as function of distance, time, frequency, and slowness. The coherence is derived from the local phases of neighboring stations which we obtain from analytic signals through the S-transform. The coherence is used to attenuate incoherent components in the time-frequency representations of the seismic records. No waveforms are averaged in our approach to maintain local amplitude information. This way we construct a data-adaptive filter which enhances coherent signals using the frequency-dependent and slowness-dependent phase coherence. We explain the method and show its abilities and limitations with theoretical test data. Furthermore, we have selected an ocean bottom seismometer (OBS) record section from NW-Spain and a teleseismic event registered at Spanish broadband stations to show the filter performance on real array data. Incoherent noise has been attenuated in all cases to enable a less ambiguous signal detection. In our last example, the filter also reveals weak conversions/reflections at the 410-km and 660-km discontinuities which are hardly visible in the unfiltered input data.
Publisher version (URL)http://www.agu.org/journals/jb/jb0704/2006JB004680/
URIhttp://hdl.handle.net/10261/19834
DOI10.1029/2006JB004680
ISSN0148-0227
Appears in Collections:(ICTJA) Artículos
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