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GMEG - Geophysics Unit of Menlo Park, CA- (GUMP)

 

Geophysics Unit of Menlo Park, CA (GUMP)

U.S. Geological Survey - Western Region - Geology and Geophysics

Paleosecular Variation

 

Paleosecular variation (PSV) curve image

Paleosecular variation (PSV) curve for Hawaii for the last 3,700 years. Each open circle denotes a mean virtual geomagnetic pole (VGP) calculated from a group of lava flows yielding the 14C age indicated. Note the very rapid changes between 1257 and 975 B.P. and the very slow secular variation that occurred between 747 and 238 B.P.

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