Estimation of crustal Qβ in the Ganga Basin using teleseismic broad-band SH waveforms for the 1988 Nepal-India border earthquake

The average value of the intrinsic shear wave quality factor, Qβ, has been estimated for the upper 55 km of the earth (47 km of crustal and upper 8 km of the upper mantle thickness) in the border region between the Ganga-Basin and Himalaya in Bihar. We have used the teleseismic Broad-Band SH and sSH waveforms of the 1988 Nepal-India border earthquake (6.4 mb) for this purpose. The frequency independent average value of Qβ estimated in the range of 0.2-1.5 Hz is found to be 1250±158.