ad is easy tO overlook tne fact tnat tne depth is quite small when conpared to tre diameter. Tc maxe tris point clear the upper part of Fig. 3.1 bas 2een drawn to snow typical prefiles of Shots 1, 3, and 4, all to the same scale and witn tne same scale for vertical depths and norizontal deptns. These same rcrefiles are repeated in tne lower part of Fig. 3.1 whee vertical distarctes are enlarged oy a factor of 10. This expansion of cepths nas been made in all of tne following figures. lio wi... oe noted from Fig. °:.. tnat tne depth on Shot 3, relative to jilameter, 1S very muc:. greater tnan on Shot 1. In scaled terms the toicxnes- «f sand below tie s::* point and above the water was much greater on Snot 4 than on Shot .. It its probable, however, that the greater relative deptn of Snot : .s primarily a function of the yield, since it seems to be well estaolisned tnat smali explosion craters have greater “ela i.e cepth toar .arze ues. 2c SHOT. Figure +.¢ 1S @ presLot pnootograpec of tne Shot 1 area on which the CASTLE gric is shown. On Fig. i.2?, which is the postshot pnotograph of tne same area, in additicns te the CASTLE grid, three lines (A-5, C-D, and E-F) have been irawo. These lines represent the tracks that the survey snip followed while the profiles presented in Fig. 3.4 were optaine:. On these and ali “ther profiles zero elevation nas been taken as the datum plane cr wnhiec- “ne tide tables are based: 0.5 ft below mean .oWw-water springs. The survey witn tne soni fatnometer snowed a uniform flat bottom at a depvn of 170 ft. Tnis f.at dottom undoubtedly represents the upper surface of mud and euspendec sand wnich was settling in tne crater. In mco-ing tne varge 7.7 S'.' . at the same ground zero, H&N obtained leac .ne soundings cf represen’. % » deptn of tne 3.3 ’-4 co a “+ ani it y is oelieved tnat tnis figure lnan ] SHY Siite met ¢ was rired .. a varge in tne center of tne Snot 1 m. itary Significance attacnes to tne crater formed by it and no fatnometer measurement. ;* .* were mace; an aerial survey, however, Wa. mace anc a protowrral . snow: as Fig. 3.5. rater, 3.4 oC SHOT: Figure. :.0 and 7.7 sre ore- and sost-Snot 3 pnotograpns. It should be notec tnat these pnutograpns are to a different scale than Figs. 3. anc -.4 so that tre is * e craters cannot be compared from tne pnd. ograpas. Figure: 7.0 and 3.9 ere cut uu: Shot > before and after tre oot, Fig, s.1 tnese two conusu: ap: of the ¢@ Tfererse in elevaticn ur tne locatios the traverses ~. lower pays 2° this fleure ani oo: maps sowing the situation for c#orectively. In tne upper part of ave deen comoined to show the contours an ed py tne snot. On this same chart, °. tne LCU are also snown. In the ~. *,1., crater profiles are shown