g-' & ok e Kis, were incomplete. Ali dynamic pressure gages were operable and records were satisfactory. A peak static overpressure measurement taken in the cleared av@- = BRL gage line on Uncle Island, which was at a ground range about equal to the center of the tree stand, is given for comparison with measurements taken within the stand. 3.3 MAXIMUM DEFLECTION MEASUREMENTS Shot 3 maximum deflection data from snubber trees on Uncle Island were unsatisfactory due to breakage of instrumented trees or fouling of wires by falling trees and branches. Deflections of instrumented trees on Victor and William Islands were negligible although all snubbers were operative. As no usable deflection data were obtained the physical characteristics of snubber trees are not reported. 3.4 SHOT 1 DAMAGE The William Island Pisonia stand near Station P-22 at a ground range of 61,710 ft, 2.5 psi peak static overpressure, was heavily damaged. Before and after interior views of the stand are given in Fig. 3.1. Damage was primarily in the form of branch breaxage with some uprocting and main stem breakage. Al. uprooted trees fell away from ground zero. All broadleaf species were completely defoliated. Only two defective palms were broken, others suffered only occasional loss of fronds. The Victor Island Pisonia stand near Station P-21, including the sample pict, at a ground range of 67,500 ft, 2.4 psi peak overpressure, were heavily c<omaged. Figure 2? 2 shows the plot interior before and after Shot 1. i.jus % 7 g.-e5 an exterior postshot view cor comparison with preshot view shown in Fig. 2.4. Damage was quite similar in appear~ ance to that on William Islard as the two smail islands were practically contiguous. Tabie 3.2 presents number, size, and damage distribution for the trees on the sample 1/4-acre plot. There was 30 per cent branch breakage, considered as light damage, in the Pisonia clump on the northwest end of Uncle Island near Station P-13 at 75,400 ft ground range, 1.7 psi peak static overpressure, and 12 sec positive phase duration time. Damage also was primarily in the form of branch breazage and heavy defoliation with occasional trunk failure and uprooting cf smaller trees. Figure 3.4 shows the Uncle Island Pisonia sample plot before and after Shot l. 3.5 SHOT 3 DAMAGE Physical characteristics of trees on the four Unele Island sample plots and corresponding breakage data are presented in Table 3.3. Fif- teen of the 26 trees in the 4 plots or 58 per cent were damaged at an average ground range of 8500 ft, 4.2 psi peak static overpressure. This degree cf damage is borne out by the appearance of the stand as a whole and was considered heavy damage. 28 SECRET -— RESTRICTED DATA