DOI: 10.1016/j.tecto.2020.228662
论文题名: Passive seismic imaging of a craton edge – Central Australia
作者: Liang S. ; Kennett B.L.N.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 797 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170643
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Liang S.,Kennett B.L.N.. Passive seismic imaging of a craton edge – Central Australia[J]. Tectonophysics,2020-01-01,797