Shear-wave Velocities in the D” Layer beneath the Indian-Eurasian Plate Collision Zone (2009-2018)- A Big Earth Data Platform for Three Poles

We use waveform cross-correlation to analyze the recordings of eight earthquakes (2009-2018) beneath the Indian Ocean at stations from the Chinese Digital Seismic Network. We obtain 929 high quality residual traveltime differences between the phases ScS and S (Differential traveltimes.dat). We interpret variations of δt up to 10 seconds as due to horizontal shear-velocity variations in D” beneath northern India, Nepal, and southwestern China. The shear velocity can vary by as much as 7% over distances shorter than 300 km. Our observations provide additional observational evidence that compositional heterogeneity and possibly melt contribute to the seismic structure of the lower mantle characterized by long-term subduction and mantle downwelling.

File naming and required software

File name: Differential traveltimes.dat；
Data reading method: The data can be opened directly with a text program (such as Notepad). Except for the header file, the main content is the ScS-S travel time residuals and its corresponding shear wave velocities.

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Cite as:

Li, G., Bai, L. (2020). Shear-wave Velocities in the D” Layer beneath the Indian-Eurasian Plate Collision Zone (2009-2018). A Big Earth Data Platform for Three Poles, DOI: 10.11888/Geo.tpdc.270369. CSTR: 18406.11.Geo.tpdc.270369. (Download the reference： RIS | Bibtex )

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References literature

1.Li, G., Bai, L., & Ritsema, J. (2020). Lateral Variations of Shear‐Wave Velocity in the D″ Layer Beneath the Indian‐Eurasian Plate Collision Zone. Geophysical Research Letters. 47. 10.1029/2019GL086856. (View Details )

Support Program

National Natural Science Foundation of China (No:41761144076)

National Natural Science Foundation of China (No:41804083)

National Science Foundation (No:EAR-1644829)

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License： This work is licensed under an Attribution 4.0 International (CC BY 4.0)