International Gravity Measurements

Woollard, George P.; Rose, John C.

doi:10.1190/1.9781560802655

Cited by 79 publications

(33 citation statements)

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“…Glennie calculated coral thicknesses on the basis of these hypotheses, but his figures must be tempered by the fact that he used the Helmert gravity formula of 1901, not the 1930 formula which yields larger negative anomalies. On the other hand, the former gives a gravity value at this latitude which differs little from the newly adopted 1967 gravity formula (Woollard, 1969). In addition, however, account should be taken of the large regional negative free-air anomaly in this part of the Indian Ocean, recently discovered from satellite observations (Gaposchkin and Lambeck, 1971).…”

Section: Background and Objectivesmentioning

confidence: 83%

Site 219

Whitmarsh¹,

Weser²,

Ali³

et al. 1974

Initial Reports of the Deep Sea Drilling Project

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Section: Background and Objectivesmentioning

confidence: 83%

Site 219

Whitmarsh¹,

Weser²,

Ali³

et al. 1974

Initial Reports of the Deep Sea Drilling Project

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“…Comparison of Woollard and Rose (1963) In Table I Table I and also Figure 1, the differences in theoretical sea level values of gravity using the two equations is non-linear, and varies from -17.15…”

Section: Values and Igsn 71 Values On An Areal Basis In Europe 124mentioning

confidence: 99%

“…Because the gravity values published by Woollard and Rose (1963) were .,orldwide in extent and descriptions were given for the sites …”

Section: Difference Between Woollard and Rose (1963) And Igsn 71 Gravmentioning

confidence: 99%

The New Gravity System: Changes in International Gravity Base Values and Anomaly Values

Woollard¹,

Godley²

1980

Self Cite

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“…These values were recorded at 5 min intervals along the ship track and tied to the international gravity base network of WOOLLARD and ROSE (1963). The data were reduced to free-air anomalies with respect to the international reference ellipsoid (GARLAND, 1965;HEISKANEN and MORITZ, 1967) with a flattening of 1/297.…”

Section: Gravitymentioning

confidence: 99%

A geophysical and geologic study of Nagata Seamount, northern Line Islands.

Sager

Davis

Keating

et al. 1982

J. geomagn. geoelec

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Nagata Seamount, located in the northern Line Islands at 12. 5N, 167. 0W, was surveyed and dredged by the Hawaii Institute of Geophysics in the fall of 1979. The seamount is 3. 7 km in height, approximately 45 km at maximum width, and has an estimated volume of 590 km3 Analysis of dredge rocks indicates that the seamount consists of alkali basalts and hyaloclastite breccias. Both acoustic reflection records and magnetic modeling studies indicate that the seamount is draped with a large volume of volcaniclastic debris about its base. At some time in its history Nagata Seamount may have been at or near sea level.The bulk of the seamount is made up of lavas of normal magnetic polarity; however, the uppermost 1, 000 m consists of reversely polarized rock. The virtual geomagnetic pole determined from the seamount falls at 61. 6N, 4. 0E not far from the average Cretaceous Pacific seamount pole. Rock magnetism studies of the dredged basalts indicate a stable magnetization. Three dimensional gravity modeling determined an average density of 2. 5 g/cm3 for the seamount. This value of the density agrees with other similar data from Pacific and Atlantic seamounts; although, unlike some other seamounts studied gravitationally, no large density variations were revealed on Nagata Seamount.K/Ar radiometric ages of 70 Ma and 86 Ma were obtained from the dredged basalts in agreement with the paleomagnetic pole. The younger age may result from alteration, thus the older date is considered more representative. This age is similar to that of nearby Kapsitotwa Seamount.

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International Gravity Measurements

Cited by 79 publications

References 0 publications

Site 219

Site 219

The New Gravity System: Changes in International Gravity Base Values and Anomaly Values

A geophysical and geologic study of Nagata Seamount, northern Line Islands.

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