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Shear-Wave Velocity Contrast Across the Indian Moho: A New Perspective.

Haldar C, Kumar P, Ray L.

GEOLOGICAL JOURNAL

https://doi.org/10.1002/gj.70146 

In this study, we estimated the shear-wave velocity contrast across the Indian Moho (δβM), which varies spatially from 0.2 to 1.1 km/s across different geological provinces. We explore scaling relationships between δβM and crustal parameters to infer geodynamic implications. δβM shows a positive correlation with crustal thickness and a negative correlation with surface heat flow. Surface heat flow is estimated using borehole derived thermal gradients and rock thermal conductivity values. These relationships suggest that temperature–pressure variations control Moho formation and progressively diffuse an initially sharp boundary through crustal reworking.

(a) Shear-wave velocity contrast map across Indian Moho with (b) ±2SE (standard error) for the δβM estimation derived using the bootstrap technique. The inset in (a) shows the change in δβM and δZ as the vertical gradation in the lower crust. Scaling relationships between δβM versus (c) bulk crustal thickness, (d) bulk crustal Vp/Vs and (e) surface heat flow.

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