A preliminary study of the properties of the TAR par eter alpha was done to attempt to detemine the dependence of alpha on physical properties of the marine section it operates on. A certain correlation rla.S fo'Und between alpha and water depth. Correlll'tiono were also found between alpha and the depth of basement. Thus -tt. was !ound that alpha va.riee inversely with wat.er depth 'because or th• increase in aed:i.Junta.ry section, or pth of baa ent, aeaward.. An 1rrnrae rela.tionahip holds aown the contin nta.l slope inoe the Nction is thinning here. On ott■hore cross-sections atud.ied, also ftrled inTer ely u to the two ti.Jle to the depth of .. aeot.iona cause the GAOO to leTel off errl1er and thua n.ry the t at which T2 occurs. 'itll T2 ocoUlTing at earlier t· ■ on !Shon.er ■ections, the interval. T2 - T1 creases, therebT increasing t.h Ta1 ot alpha.