Abstract
Since the origins of hotspots are on the core-mantle boundary, activities of hotspots are expected to be affected by activities of the core. We have analyzed the correlation between the variations of the activity of Hawaiian hotspot and the geomagnetic polarity bias. The results suggest that the activity of the Hawaiian hotspot is enhanced in the period of the normal polarity bias. The time lag of the volume flux of the hotspot volcanism behind the polarity bias is a few millions of years. The correlation and lag can be explained in terms of the development and upwelling of the plume resulting from the core fluid motions.
