海洋地质与第四纪地质2017，Vol.37Issue(2)：75-81,7.DOI:10.16562/j.cnki.0256-1492.2017.02.008
南海西南次海盆反射莫霍面成像及其地质意义
IMAGING OF REFLECTION MOHO IN THE SOUTHWEST SUB-BASIN OF SOUTH CHINA SEA AND ITS GEOLOGICAL IMPLICATIONS
摘要
Abstract
Deep crust structure is important to understand the dynamic origin of a marginal sea basin.However,reflection Moho has been poorly imaged in the Southwest Sub-basin of the South China Sea so far.So we reprocessed a portion of the seismic line NH973-1,which was collected with a 6 km streamer,to improve the Moho imaging.This data is rich of peg-leg multiples,thus the Moho is masked.For this,Parabolic Radon transform filtering is firstly applied to suppress the peg-leg multiples to get a initial velocity of the deep reflections.Then,velocity filtering and inner muting are carried out to further attenuate the multiples.Consequently,peg-leg multiples are attenuated effectively,and the discontinuous strong reflections,likely Moho,appear clearly.The interpreted crust (except sediments) is about 2.3 to 3.9 km thick,which is different from the normal oceanic crust,but more like the crust created by tectonic dominated seafloor spreading.关键词
反射莫霍面成像/层间多次波压制/薄地壳/西南次海盆Key words
the Southwest sub-basin of the South China Sea/reflection moho imaging/peg-leg multiple suppression/thin crust分类
海洋科学引用本文复制引用
于俊辉,阎贫,郑红波,王彦林,赵旭..南海西南次海盆反射莫霍面成像及其地质意义[J].海洋地质与第四纪地质,2017,37(2):75-81,7.基金项目
国家自然科学基金项目(91328205,41376062) （91328205,41376062）
729工程项目(GZH20110205) （GZH20110205）
