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Study of the Indian Shield’s Crustal and Lithospheric Structure Based on Joint Inversion of P-Receiver Functions and Rayleigh Wave Fundamental Mode Group Velocity Dispersion Data.

Mandal P, Prathigadapa R, Saha G, Kumar S.

PURE AND APPLIED GEOPHYSICS

http://dx.doi.org/10.1007/s00024-025-03779-y 

The seismic study in Hyderabad reveals Moho depths of 35.5–37.6 km (mean 36.7 ± 0.7 km) (Fig. 1a), matching prior EDC studies (32–38 km). The Hales discontinuity at 90–115 km aligns with earlier Dharwar craton findings (80–120 km). Lithospheric thicknesses (Fig. b) range 134–154 km (mean 139.6 ± 6.7 km), thicker than previous receiver function estimates (~90–100 km) but consistent with xenolith and magnetotelluric data (80–250 km). These results indicate a thinner Archean crust and dynamic lithosphere modification beneath Hyderabad, refining earlier models.

The figure presents the Hyderabad seismic network with 10 broadband stations (blue triangles) and historical M≥4 events (red circles), showing modeled (a) Moho depths (in km) and (b) Lithosphere-Asthenosphere Boundary (LAB) depths (in km) from joint inversion. A black dotted elliptical area marks a crustal thinning zone with low Bouguer gravity in Figure 1a, and (c) an E-W trending (i.e. A1A2 in Figure a,b) CCP PRF cross-section revealing Moho (M), Hales (H), and LAB (L) discontinuities.

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