| DOI: | 10.1002/2015GL063869
|
| 论文题名: | PKP precursors: Implications for global scatterers |
| 作者: | Waszek L.; Thomas C.; Deuss A.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-9323
|
| EISSN: | 1944-9054
|
| 出版年: | 2015
|
| 卷: | 42, 期:10 | | 起始页码: | 3829
|
| 结束页码: | 3838
|
| 语种: | 英语
|
| 英文关键词: | seismology
|
| Scopus关键词: | Ray tracing
; Core-mantle boundary
; Data coverage
; Partial melt
; Regional variation
; Scattering strength
; Seismic energy
; Small-scale heterogeneity
; Ultralow velocity zone
; Seismology
; amplitude
; data set
; inner core
; mantle
; ray tracing
; scattering
; seismogram
; seismology
|
| 英文摘要: | Precursors to the core phase PKP are generated by scattering of seismic energy from heterogeneities in the mantle. Here we examine a large global data set of PKP precursors in individual seismograms and array data, to better understand scattering locations. The precursor amplitudes from individual seismograms are analyzed with respect to the inner core phase PKIKP and mantle phase PP. We find and correct for a hemispherical asymmetry in the precursor/PKIKP amplitudes, resulting from inner core structure. Using ray tracing, we locate scatterers in our array data and use these to infer scattering locations in the individual data. The scattering strength displays regional variation; however, we find no relationship with long-scale core-mantle boundary velocity structure. Scattering is observed in all regions of data coverage, as are paths with no precursors. This indicates that scattering occurs from various small-scale heterogeneities, including but not limited to ultralow velocity zones or partial melt, and slabs. ©2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931561006&doi=10.1002%2f2015GL063869&partnerID=40&md5=a5872844c935780defb862be7942aa9b
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8938
|
| Appears in Collections: | 科学计划与规划
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | Bullard Laboratories, University of Cambridge, Cambridge, United Kingdom
|
| Recommended Citation: | |
Waszek L.,Thomas C.,Deuss A.. PKP precursors: Implications for global scatterers[J]. Geophysical Research Letters,2015-01-01,42(10).
|
|
|