气候变化领域集成服务门户(CCPortal): Passive seismic imaging of a craton edge

CCPortal

DOI	10.1016/j.tecto.2020.228662
	Passive seismic imaging of a craton edge – Central Australia
	Liang S.; Kennett B.L.N.
发表日期	2020
ISSN	00401951
卷号	797
英文摘要	Passive seismic recordings of teleseismic P wave arrivals and their immediate coda along a dense profile of stations can be used to image the reflection structure beneath the profile. The process exploits the autocorrelation of the seismic signals that extracts the reflection response from the transmitted signals recorded at the surface, which can be migrated to provide a depth image. This common reflection point (CRP) imaging exploits the same portion of the seismic record used in receiver function studies, but is much less influenced by multiple problems in the presence of sediments. This style of passive seismic imaging is applied to a dense line of 68 stations at 3.5 km spacing at the northern edge of the Gawler Craton in South Australia in the MAL experiment. With nine months of passive seismic monitoring it has been possible to image fine-scale structural variations throughout the lithosphere. There is a strong variation in crustal thickness as the MAL profile crosses the inferred location of the craton edge under sedimentary cover. A transitional zone between crust and mantle can be identified that extends beneath the receiver function Moho, pinching out gently at the craton edge. The CRP imaging reveals distinct reflectivity in the lithospheric mantle with horizontal scales of 10–30 km, and vertical scales of no more than a few kilometres. The character of this reflectivity appears to change across the craton edge. There are indications of a semi-continuous mid-lithosphere discontinuity at around 90 km depth. © 2020 Elsevier B.V.
关键词	Autocorrelograms Central Australia Common reflection point imaging Lithospheric discontinuities Moho Receiver functions
英文关键词	Reflection; Seismic waves; Seismology; Common-reflection points; Crustal thickness; Lithospheric mantle; Receiver functions; Sedimentary covers; Seismic monitoring; Structural variations; Transmitted signal; Structural geology; arrival time; craton; discontinuity; lithospheric structure; Moho; P-wave; seismic data; seismic response; seismic source
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207810
作者单位	Inner Mongolia University of Technology and Inner Mongolia Seismological Bureau, China; Research School of Earth Sciences, The Australian National University, Canberra, ACT 2601, Australia
推荐引用方式 GB/T 7714	Liang S.,Kennett B.L.N.. Passive seismic imaging of a craton edge – Central Australia[J],2020,797.
APA	Liang S.,&Kennett B.L.N..(2020).Passive seismic imaging of a craton edge – Central Australia.Tectonophysics,797.
MLA	Liang S.,et al."Passive seismic imaging of a craton edge – Central Australia".Tectonophysics 797(2020).