Gravity anomalies and flexure of the lithosphere at Ascension Island

Flexure of Venusian lithosphere measured from residual topography and gravity

[1] The elastic lithosphere thickness Te for various locations on Venus is estimated by modeling lithospheric flexure associated with rifts, coronae, chasmata, and the moats visible around certain large volcanoes. By modeling flexure using the residual topography, a range of elastic thicknesses was found, from around 10 to 40 km or greater. A number of these values are not well-determined and o...

Isostasy and Flexure of the Lithosphere

The Orientation of Pigeons at Gravity Anomalies

The means by which homing pigeons determine the direction to their home loft when released in unfamiliar territory remains a mystery. Hypotheses involving the sun (Matthews, 1953, 1955), Coriolis force and the earth's magnetic field (Yeagley, 1947, 1951), inertial cues (Barlow, 1964, 1966), infrasound (Kreithen & Quine, 1979), have been advanced but currently there is no strong empirical suppor...

Some case histories from Ascension Island.

THE physician of today is aware of the numerous adverse effects and potential hazards of modern drug therapy, and it is both refreshing and instructive to look back to the days when the physician's 'armentarium' of therapeutic agents was of 'narrow spectrum', and when many of the 'drugs' available were basically only of 'nutritive' value. Such retrospective views, even though they are often bri...

An odyssey of the green sea turtle: Ascension Island revisited.

Green turtles (Chelonia mydas) that nest on Ascension Island, in the south-central Atlantic, utilize feeding grounds along the coast of Brazil, more than 2000 km away. To account for the origins of this remarkable migratory behavior, Carr and Coleman [Carr, A. & Coleman, P. J. (1974) Nature (London) 249, 128-130] proposed a vicariant biogeographic scenario involving plate tectonics and natal ho...