Seismic Surface Wave Dispersion and the Crust across the Gangetic basin

Abstract

A BS r RACT.L mg Period seism ograph reccrd sof Delh! of 6~e earthquakes in the East Pakistan 'BurmajIn dl a b .1"(1('(f'e"J;i on have been studied.The dispeesio t of fundamental and the second mode Rayleigh and L ~\'e waVes and that of PL WftVCfI have b.."CIl computed .Phase "elociti{'ll uf the fundame-ntal Rayleigh end Love wavee were alit") dorermincd by using Brun e's method.Inference regarding the ..tru ctu re of the crust aeroea the Gangeti(' beein \\"&8 made by compari84.JD.I\•~th kno~"ll tbe-rettcal mod("l~88 well 8" b,..using the partial derivetdvee ot the pbeee \"elodl i MJ Iollowing Doruien and h"'''l~(Itl62).Brune and Don nan (lH63) and Ander s en (196-1).All the data lore foun d t o be coneisteet with the following structure o f the crnst -A .. ~P 3 km 3 •98 2 •30 2• 3-10 17 kill 6• 15 3 •5.• 2 •817 :?O km 6 " >~3 • 13Q :H)22 One o f the ~~ftbCJu.a.kell i?-clude< l in its p:,t b .t'JDel hi a. I:'art of the continental shelf .Tho close agree mont of th o group velocltfee of Rayleigh we vee for t hi a mixed petb With those Iro-n the other enrthquakee ebo wa that the dlsperaiou propcrttee of the continental shelf Involved are noarly the Mille all of tho Ga nget ic basin , Tho !'Mutts fro m lh'l diapced on etud loe have baen ditICu60iOO.with respect to tb" Geologi cal anti Gcopbyeical result s bearing on the su bject ,