Fig. 3

a Sedimentary layer interface of the NCC. b The anomalous gravity gradient component \({\varvec{T}}_{zz}\) caused by the relief at the sedimentary layer interfaces. c The uncertainty depth of the sedimentary layer interface. d The anomalous gravity gradient component \({\varvec{T}}_{zz}\) caused by the sedimentary layer uncertainty depth. e Moho layer interface of the NCC. f The anomalous gravity gradient component \({\varvec{T}}_{zz}\) caused by the relief at the Moho layer interfaces. g The uncertainty depth of the Moho layer interface. h The anomalous gravity gradient component \({\varvec{T}}_{zz}\) caused by the Moho layer uncertainty depth. i The gravity gradient effect \({\varvec{T}}_{zz}\) caused by the long-wavelength correction