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Cambridge Austerdalsbre Expedition Paper No 6

By J F NV

(Unversit f risto)

BSTRAC. Th ra sran nsor a a on on h surac a lcr may drmnd y snu a numr o saks n a arn nd masurn h ra chan o h dsanc wn hm. Asual arn consss ur sks a h cornrs o a squar wh on sak a h cnr F uharns wr usd n Ausrdsrn, rway n Auus 96 Th rom s dduc h s au h 3 ndndn cmonns o h sranra nsor rom h masurd quan and, or hurs a squars mhod nn y Bnd or h analoous rolm n crysal hyscs s usdh rnca sranras ar ound o whn aou o ' yr and hr drcns rla o h asysm whn au Th drcns and mnuds h rnca srss ar hn d d ucdrm ns ow w and a sua nra hory Th drcns h rncal sranra ar n darmn wh h drcons o h crss u h xrmn s nconclus n h quson o h manud o h srss ndd o orm a crs

ZAMMFNG. r Tnsor dr Dormonsschwndk n nm unk u dr lschrorch kann smm wrdn ndm man Sck n rlmssr Anrdnun u dm lschrs nd d ndrun dr Dsanzn zwschn hnn mss n n Anrdnun sh au4 Sckn an dn ckn ns Qudras m nm Sock n dr M n slch Anordnunn wurm Auus u dm Ausrdsr n orwn ausll Das rom sh nun darn au! Msswrn d n Wr r d 3 uahn Kmnnn d DrmansschwndsTnsors aun r dsn Zwck wurd n hod dr klnsn Quadra rwnd, d nBnd r n anaos rom n dr Krsahys rundn wurd D Hauschwndkn wurnnnrhal nr hlrrnz on jar smm und hr Rchunn n Bzu u das Scsysm nnrha O Rchunn und rss dr ausannunn wurdn dann aus lslsss und nr nsrchndn amnn Thor al D Haudormonsrchunnsmmn m dn chunn d chrsan u rn ar ds xrmn lss d ra rzur Sandun nn usnnun n

. INTRODUC

n 95 te ambridge Austerdalsbre Expeditin was studig the formati of waveogves at he ft of the Odisbre ice fall i ra. For tis purpose a lie of 23 stakesuin logitudial dow te glacier was set up Fig I ad te chanes the distanesbetween the staes were measured ver a period of e moth. t as then possible to dedcete lonitudia strainrate i te ice as a fucti of the distace down the lacier; ths aste main purpse f the experiet and the results ae full described n referece 3. Thepreset paper is cncerned it sme additioa easuremets ade on the stae sstemesides ndig ut the logitudial compet f strai-rate e wated t ave someomation abut the other cponents of te strainrate tesor at a few representatvepits dow te stae lie We terefore set up te ve squares of staes shw i Fi

centred on Staes 3 , C, D ad E measurig the sdes ad diagonals f tese saepatterns at itervals over a perid f one mt it was possible t calculate with csideraleaccurac all cpoents of the rate of strai tesor at the ve cetre points. he umbe ofquatites measured at each square s reater ta the number f uknows t be devedfom them ad te method used t calculate te strairate cpets fom te data mabe of some iterest.

Havig btaied the strairate compets we poceed to callate te pricipastrairates ad b usin the easured ow la f ice, the pricipal stresses t so appenedthat the mai stae ine sirted the edge of a extesive crevassed aea on its ester sidet is theefore posible to compare the drecto f te cevasses it the detio of the n

cipal strainrates, and to see hether the crevasses ae associated wth tesile stesses49

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