English
 
Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

How P‐Wave Scattering Throughout the Entire Mantle Mimics the High‐FrequencyPdiffand Its Coda

Authors
/persons/resource/tuo

ZHANG,  TUO
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/chris

Sens-Schönfelder,  C.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Bianchi,  Marcelo
External Organizations;

Bataille,  Klaus
External Organizations;

External Ressource
No external resources are shared
Fulltext (public)

5027022.pdf
(Publisher version), 19MB

Supplementary Material (public)
There is no public supplementary material available
Citation

ZHANG, T., Sens-Schönfelder, C., Bianchi, M., Bataille, K. (2024): How P‐Wave Scattering Throughout the Entire Mantle Mimics the High‐FrequencyPdiffand Its Coda. - Geophysical Research Letters, 51, 14, e2024GL109348.
https://doi.org/10.1029/2024GL109348


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5027022
Abstract
We document the arrival of seismic energy in the core shadow zone up to large distances beyond 150° more than 100 s prior to the core phases. Numerical simulations of the energy transport in an established heterogeneity model show that scattering throughout the entire mantle explains these observations. Diffraction at the core-mantle boundary is unlikely in our 1–2 Hz frequency band and is not required indicating misleading terminology with reference to Pdiff for the scattered P∗P-energy. Records of the largest deep earthquakes at low-noise stations are key to the observation of the faint precursory signal which changes appearance with increasing distance from a coda-like decay over a constant amplitude level around 130° to an emergent wave train. According to our simulations, different depth layers in the mantle dominate different time-distance windows of the scattered wave train, providing the opportunity to improve the depth resolution of mantle heterogeneity models.