MAY BE XEROXED

ntII nor huhme opt~m~ll? $0 trlm starcs or dyndme corrections \I~uuld hs applwd sit~.i Ch
sepsr~tam m d hekrrc rhon nnsdun S Y tnhmccment.
stmdenl pmcars~ng ofVSP ddai~cquired a~rh a 8 ~hl.alor rouxc ~~rludvr a
aa\esl~dpi~lg opvmtion ahlch ~n\oi\r.r rhaplng rhr. tram spuctm sj ll,dt oh$ de\lrr.d rcrldunl
o,nr.lct. Th,\ pmcerr taker place ~n thr. fi~quunr.y dunlacl> h) rpsctral-d8\1.;a,n nlrlnn thc
I ~ C L . ~ hil~til~~dcl~ 111, I IT~CU-~IIM h.latr. Thc dc~rcd \ra\r.lr.t I* r cllsicn~d ~<
Juan-going ctrmprc\rtonal ad\i'tivld trinelr a \huncr path than thr. up-so~ng n;ni.tiuld .,I
an) gtvo depth nl thdt it ruifcr* the icost tiom Q-att~'nuilliun. Thc $n~llrl da\\n-ya
makcr thu h?st na\ekr dstlmute ti,r VSP deut,n\olutiun ofup-.n,~necnere! ~nsrcad idol
~moth~xl, (hat mahi: i~*,umpt~alar about rullcctn~~y and au\clct #pcctr;l. In~lmll~. r thruc-
pnmt nlcJan tiltc~ 15 applied in TT umc to hue* chi. S \, mllo. Thc rc\ult~n~ $r.nclelr
cat~ta>ntd wthln a \pucttiud txn,~. windoa centred on the timt hruitl ur~d 10 rlernc il?c
ticquunc) dum.un opantun xo apply to the \cpar.ttcd ap-going a;~~ulicld. Snncc tltu dcl~11-
gnnp a.ncticId hrr ,I d~rpl~ccmcnl polarti) oppoatlc rl Ihc up-gnnns \sa\r.ticld. ths up-
gulnp ducom~>l\ud n.rulr rcclalms polrnty chiinpe. If rlgnai m nolac ~r hn. Ihc*u ~\a\ulet\
coold hu \tuclud nl credld an a\tragc. but sace-al\c rpplicuunn het~.i r.irnlpr.n~.lle\ tor
pn,papntlon ettcar.
The prc-processed VSP dalil br etch well ~liustrdres the various time hmcs dppliud
in VSP pmccasing(Fipres 3 2..la.b.c). Thew &ail arc derurlhed ~n moredcta!l ~n ehrptcr 5
Curnpdrud to .iurLue pug-ItgotYects hctwcen SSP and VSP der. the daan-_eotng VSP
surbce source \\~vFIc~uIII be tbllowed by a mult~plc ofappor~tr polanly with lag cquill to
theTWTdelayofIhe weathered layer. The dew-going wabeia from thc reef\rell dirpliqs
79