Gravity Survey of Molokai— Moore and Krivoy 
345 
Fig. 3. Bouguer gravity anomaly map of the island of Molokai, Hawaii. 
Molokai. These stations with terrain corrections 
in milligals are: No. 3, +1.6; No. 38, +16.5; 
No. 49, +4.6; and No. 55, +0.8. The terrain 
effects are particularly large in the central, rug- 
ged part of East Molokai, and here uncorrected 
values must be used with caution. 
The gravity data on the south and east flanks 
of East Molokai Volcano are insufficient to 
define any rift zones. Although the coverage is 
incomplete, the data suggest that the rift zone 
on the west side of the volcanic center extends 
west-northwest from the summit of East Molo- 
kai Volcano through the Kalaupapa peninsula. 
The vent which extruded the lava flows that 
built the Kalaupapa peninsula was presumably 
fed by magma moving from the volcanic center 
through this rift zone. 
REFERENCES 
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. 
Kinoshita, W. T., H. L. Krivoy, D. R. Ma- 
bey, and R. R. MacDonald. 1963. Gravity 
survey of the island of Hawaii. U. S. Geol. 
Survey Prof. Paper 475-C:€l 14-016. 
Macdonald, G. A. 1956. The structure of Ha- 
waiian volcanoes. K. Nederlandsch GeoL- 
Mijn. Genootschap Verb., Geol. Ser., Deel 
16:274-295. 
McDougall, Ian. 1964. Potassium-argon ages 
from lavas of the Hawaiian Islands. Geol. 
Soc. Am. Bull. 75:107-128. 
Moore, J. G., and H. L. Krivoy. 1964. The 
1962 flank eruption of Kilauea volcano and 
structure of the east rift zone. J. Geoph. Res. 
69:2033-2045. 
Stearns, H. T. 1946. Geology of the Hawaiian 
Islands. Hawaii Div. Hydrog. Bull. 8. 106 pp. 
and G. A. Macdonald. 1947. Geology 
and ground-water resources of the island of 
Molokai, Hawaii. Hawaii Div. Hydrog. Bull. 
11. 113 pp. 
