气候变化领域集成服务门户(CCPortal): High-Frequency (6 Hz) PKPab Precursors and Their Sensitivity to Deep Earth Heterogeneity

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DOI	10.1029/2020GL089203
	High-Frequency (6 Hz) PKPab Precursors and Their Sensitivity to Deep Earth Heterogeneity
	Sens-Schönfelder C.; Bataille K.; Bianchi M.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	We present observations on a new precursory phase of seismic waves scattered in the deep Earth. This phase arrives prior to the PKPab wave at epicentral distances larger than 155°, and we call it PKPab precursor. We show that the presence of the PKPab precursor is a necessary consequence of scattering in D″, which is the commonly accepted cause of the PKPdf precursor at distances smaller than 145°. PKPdf waves that propagate through the inner core should arrive before the PKPab precursor but those, are strongly attenuated in the inner core at frequencies between 4 Hz and 8 Hz used here, making the PKPab precursor the earliest teleseismic signal at distances larger than 155°. Calculated PKPab precursor sensitivity kernel shows that this phase is mostly sensitive to scattering along the closest PKPbc path between source and receiver. It can thus help to constrain the lateral distribution of heterogeneity along D″. © 2020. The Authors.
英文关键词	Geophysics; Deep earths; Epicentral distances; High frequency HF; Inner core; Lateral distributions; Sensitivity kernels; Teleseismic; Earth sciences
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169179
作者单位	Seismology Section (2.4), GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany; Earth Sciences Department, University of Concepción, Concepción, Chile; Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Sao Paulo, Brazil
推荐引用方式 GB/T 7714	Sens-Schönfelder C.,Bataille K.,Bianchi M.. High-Frequency (6 Hz) PKPab Precursors and Their Sensitivity to Deep Earth Heterogeneity[J],2021,48(2).
APA	Sens-Schönfelder C.,Bataille K.,&Bianchi M..(2021).High-Frequency (6 Hz) PKPab Precursors and Their Sensitivity to Deep Earth Heterogeneity.Geophysical Research Letters,48(2).
MLA	Sens-Schönfelder C.,et al."High-Frequency (6 Hz) PKPab Precursors and Their Sensitivity to Deep Earth Heterogeneity".Geophysical Research Letters 48.2(2021).