A Gravity Survey of the Island of Kahoolawe, Hawaii 1 
Augustine S. Furumoto 
Through the courtesy of the U. S. Marine 
Corps, a gravity survey of the island of Kahoo- 
lawe was conducted in the spring of 1964. Pre- 
selected points on the island were visited by 
means of a helicopter, operating from Kaneohe 
Marine Corps Air Station, and gravity read- 
ings were taken. On the way to Kahoolawe 
and on return, stops were made at Kahului Air- 
port on Maui to tie the data into the gravity 
network of the Hawaii Institute of Geophysics. 
The instrument used was the Worden grav- 
ity meter with slow drift. Altogether, 15 ob- 
servations were made on Kahoolawe within a 
space of 3V2 hours. The observation points 
covered the entire island. 
The field data were reduced by applying 
1 Hawaii Institute of Geophysics Contribution No. 
94. 
Bouguer corrections with the assumption of a 
surface density of 2.3 g/cm 3 . The reduced data 
were plotted on a map of the island and con- 
tours of 5-mgal intervals were drawn. The re- 
sults are shown in Figure 1. The table of prin- 
cipal facts is reported elsewhere (Hawaii Inst. 
Geoph., 1965, Table 5). 
A region of high positive anomaly exists on 
the eastern side of the island. This agrees with 
surface geology, which shows a center of former 
volcanic activity on the eastern side of the island. 
REFERENCE 
Hawaii Institute of Geophysics. 1965. 
Data from gravity surveys over the Hawaiian 
Archipelago and other Pacific islands. Hawaii 
Inst. Geoph. Rept. 65-4, March 1965. 10 
tables. 
349 
