Theory and methods that attenuate multiple from the TAIGER marine reflection seismic data set
Presenter: Ci-Jhu Lyu
Date: 2014/09/18
Abstract
Taiwan is located in the Eurasian Plate (EP) and the Philippine Sea plate (PSP). The southern Ryukyu Arc (SRA) system where the PSP subducts northward beneath the EP, both plates interacting at depth beneath the northeastern part of Taiwan island. We analyze in this study the dynamics of SRA system with TAIGER program of 2009, multi-channel marine seismic reflection. Data area covers about 30,000 km2 and 23 active lines. Shots are spaced every 50 m, hydrophones are spaced every 12.5 m, and CDP spacing is 6.25 m. Recording length is 15 s. Signal of the source is low frequencies (20Hz~60Hz), which can penetrate the shallow sediments and reflex signal of the deep crust. In previous studies, the boundary where the PSP subducts northward beneath the EP have no clear answers due to a lack of high-resolution crustal-scale geophysical constraints. They want to know the Moho boundary, but multiple can affect the deep structure signals. Therefore, they use a variety of methods to remove multiple effect, and increase Moho signals. In this study, they use four ways to remove the multiple. (1) Gapped Deconvolution. (2) 2D Surface-Related Multiple Elimination (SRME). (3)Radon Transform multiple attenuation.
Reference
Ryan Lester, Kirk McIntosh (2012) Multiple attenuation in crustal-scale imaging: examples from the TAIGER marine reflection data set. Mar Geophys Res (2012) 33:289–305, DOI 10.1007/s11001-012-9149-1
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