High-Frequency (6 Hz) PKPab Precursors and Their Sensitivity to Deep Earth Heterogeneity

Autor C. Sens-Schönfelder
Autores Sens-Schönfelder, C., Bataille, K., & Bianchi, M.B.

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″.

Programa Geofísica
Ano de publicação 2021
Tipo de publicação Artigo publicado em revista
Nome da revista/jornal Geophysical Research Letters
Localidade Publicação Internacional
Volume 48
Número 2
DOI https://doi.org/10.1029/2020GL089203
Página web https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL089203
Anexo Sens-Schönfelder, C., Bataille, K., & Bianchi, M.B..pdf