We present 150 new heat flow measurements obtained at eight sites along a 1230-km-long profile across the Hawaiian Swell about 700 km ESE of Midway Island. Most of the measurements include in situ thermal conductivity determinations, which helped to reduce the statistical uncertainties (95% confidence) at all sites to 59 mW m-2, about 20% higher than the predicted heat flow for 100 Ma seafloor based on simple lithospheric cooling models. Thus even though there is a small increase in heat flow with age along the swell, when compared with the off-swell heat flux, the anomalous heat flow associated with the Hawaiian Swell is probably of the order of 5--10 nW m-2 and arguably may not exist at all. A previous investigation <Von Herzen et al., 1982> may have overestimated the magnitude of the heat flow anomaly associated with the Hawaiian Swell by comparing heat flux measurements on the swell with values expected for simple lithospheric cooling models. The heat flow anomalies associated with the Bemuda Rise and the Cape Verde Rise may also be smaller than previously estimated, given the uncertainties in the heat flux on the normal seafloor surrounding these swells.

The lack of a significant heat flow anomaly associated with the bathymetric expression of the Hawaiian Swell is inconsistent with simple models of lithospheric reheating. Dynamic support, accompanied by modest temperature increases (30 Ma) oceanic lithosphere. ¿ American Geophysical Union 1989