气候变化领域集成服务门户(CCPortal): Seismic Diffraction Imaging to Characterize Mass-Transport Complexes: Examples From the Gulf of Cadiz, South West Iberian Margin

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DOI	10.1029/2020JB021474
	Seismic Diffraction Imaging to Characterize Mass-Transport Complexes: Examples From the Gulf of Cadiz, South West Iberian Margin
	Ford J.; Urgeles R.; Camerlenghi A.; Gràcia E.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Mass-transport complexes (MTCs) are often characterized by small-scale discontinuous internal structure, such as slide blocks, rough interfaces, faults, and truncated strata. Seismic images may not properly resolve such structure because seismic reflections are fundamentally limited in lateral resolution by the source bandwidth. The relatively weak seismic diffractions, instead, encode information on subwavelength-scale structure, with superior illumination. In this paper, we compare diffraction imaging to conventional, full-wavefield seismic imaging to characterize MTCs. We apply a seismic diffraction imaging workflow based on plane-wave destruction filters to two 2D marine multichannel seismic profiles from the Gulf of Cadiz. We observe that MTCs generate a large amount of diffracted energy relative to the unfailed confining sediments. The diffraction images show that some of this energy is localized along existing discontinuities imaged by the full-wavefield images. We demonstrate that, in combination with full-wavefield images, diffraction images can be utilized to better discriminate the lateral extent of MTCs, particularly for thin bodies. We suggest that diffraction images may be a more physically correct alternative to commonly used seismic discontinuity attributes derived from full-wavefield images. Finally, we outline an approach to utilize the out-of-plane diffractions generated by the 3D structure of MTCs, normally considered a nuisance in 2D seismic processing. We use a controlled synthetic test and a real-data example to show that under certain conditions these out-of-plane diffractions might be used to constrain the minimum width of MTCs from single 2D seismic profiles. © 2021. The Authors.
英文关键词	diffraction imaging; marine geohazards; mass-transport complexes; seismic imaging
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187327
作者单位	National Institute of Oceanography and Applied Geophysics - OGS, Sgonico, Trieste, Italy; Dipartimento di Matematica e Geoscienze, Università degli Studi di Trieste, Trieste, Italy; Institut de Ciències del Mar, CSIC, Barcelona, Catalonia, Spain
推荐引用方式 GB/T 7714	Ford J.,Urgeles R.,Camerlenghi A.,et al. Seismic Diffraction Imaging to Characterize Mass-Transport Complexes: Examples From the Gulf of Cadiz, South West Iberian Margin[J],2021,126(3).
APA	Ford J.,Urgeles R.,Camerlenghi A.,&Gràcia E..(2021).Seismic Diffraction Imaging to Characterize Mass-Transport Complexes: Examples From the Gulf of Cadiz, South West Iberian Margin.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Ford J.,et al."Seismic Diffraction Imaging to Characterize Mass-Transport Complexes: Examples From the Gulf of Cadiz, South West Iberian Margin".Journal of Geophysical Research: Solid Earth 126.3(2021).