ing
The results obtained at the farther stations are tabulated below,
Station
7
Ailinginae
Eniwetok
Wake
Johnston
Approximate
largest Wave
Range (mi.)
Height (cm)
40
200
500
1.9
6.2
3*
1500
Period
No. of
(sec)
Wavea
375
350
320
3
5
7
Undetectable above high background
* Results by TWX subject to later correction
In addition, two or three very long period (85 minute) waves about
1 cm high were observed on the Cherokee record from Eniwetok, where the
background was very low.
Microbarographic records were obtained at both Wake and Johnston
Islanis.
The water wave arrivals reported above are much larger than
those reported during CASTLE.
This increase is attributed to the actotl
of ten increase in sensitivity of the present instrument over that used
for CASTLE.
It is significant that Ailinginae at 40 miles range received smaller
waves than Eniwetok (200 miles),
This result agrees with the microbarograph
records analyzed for CASTLE, in which the "shadow zone" for net integrated
air pressure impulse was shown to extend at least 30 miles from the shot.
It also indicates that these long waves are generated by barometric in-~
pulses and not by energy directly transmitted to the water.
The wave
generation process seems to be independent of the source conditions
(surface or air burst).
COPIED/D0;
; Lan Rt 0%
Y
Q