Off-site records from Orange in Table 6.4 are quite similar to recordings
made at comparable distances from other large shots.
Arrival times are vhat
would be expected for blasts ducted by the ozonospbere.
pot shown, sicce they are wery close to zero degrees.
Incidence angles are
Some of the apparent
welocities were calculated to be less than local sound speed, and bave therefore probably been affected by prevailing strong northeasterly trade winds at
that location.
tions.
There may also be errors from the survey of the sensor loca-
There are no detailed wind observations available, so this peculiarity
is being ignored.
Experience has shown that this condition does not arise
when precise survey, wind, and temperature data are svailable.
6.1.4 Explanation of Results
With the viewpoint conditioned by Shelton® and Bethe* and quantities of
data from lov-altitode fests, blast propagations from Teak and, to a lesser
degree from Orange, were astonishing.
Everything appeared to be ancanalous,
but a relatively straightforward application of modified Sachs scaling-©
brings nearly everything observed into agreement.
The main unknown was the
strength of the equivalent initial point-source blast vave as a function of
burst height.
Modified Sachs scaling shows that, independent of burst height, a scaled
overpressure,
OP = (P/PJOP, )
is observed in an anbiert atwospheric pressure P at a scaled range
R= (we,)'/3 (pyp)*/3 R,
from a yield W.
1g
Zero subscripts refer to walues in 2 referenced starcdard