Gravity Survey of Kauai- — KRIVOY, BAKER, and Moe 
355 
Fig. 1. Topography of Kauai, Hawaii, showing gravity meter stations. 
Stations were selected and located on U. S. Ge- 
ological Survey 7 V 2 -minute compilation prints 
with a scale of 1:24,000. Figures 1 and 2 are 
based on existing U. S. Geological Survey 
1:62,500 maps of Kauai, to which station loca- 
tions were transferred for greater convenience. 
DETAILS OF INTERPRETATION 
For ease in comparing results of this survey 
with those of previous Hawaiian surveys, the 
Bouguer anomalies are based on a combined 
elevation correction using 2.3 as bulk density 
down to sea-level. The use of density 2.3 has 
been discussed by Woollard (1951) for Oahu 
gravity and by Krivoy and Eaton (1961) for 
the gravity of Kilauea volcano on Hawaii island. 
As the gravity survey extends westward from 
the fresh, vesicular, and relatively uniform flows 
of Hawaii toward the more deeply weathered 
older islands of the state, the choice of 2.3 dens- 
ity remains convenient albeit less defensible. 
Not much is known about the extent to which 
the more deeply weathered islands are mantled 
by soil and saprolite with density as low as 1.0. 
Soil conservation studies, where they have been 
made, habitually are concerned with only the 
first few feet of soil-cover — the zone of interest 
in agriculture and in erosion studies. Kauai, 
therefore, may be largely overlain by varied 
erosional products with densities much less than 
2.3. Macdonald et al. (I960) describe the deep 
weathering and the vegetative cover on Kauai 
which make determination of strike and dip im- 
possible in most places. 
It should be noted that assuming too high a 
density for the lavas of Kauai would result in 
a Bouguer configuration which undervalued 
high elevation stations. Thus, the unusually 
high Bouguer anomalies mapped in Kauai 
would be even larger if a more realistic (smaller) 
density value were known and were applied. 
