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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Paleomagnetic study of basaltic rocks from Baengnyeong Island, Korea: efficiency of the Tsunakawa–Shaw paleointensity determination on non-SD-bearing materials and implication for the early Pliocene geomagnetic field intensity

Fig. 3

Summary of paleodirectional results. a Examples of progressive AFD (with the LTD pre-treatment) results of NRMs displayed on Zijderveld diagrams with geographic coordinate system. Determination of a ChRM direction from the PCA (Kirschvink 1980) is shown in each Zijderveld diagram. b Equal-area projection of ChRM directions from 11 specimens for two sites, with an overall mean of the ChRMs and its 95% confidence limit (shown in red). Grey-colored data represent data excluded in calculating the overall mean. Note that, for specimen B2B-2-1, a great circle fit by the technique of Halls (1976, 1978) is shown. c VGP positions calculated from the ChRM direction data used in the ChRM mean determination (see Fig. 3b) on the northern hemisphere, with their mean and the corresponding 95% confidence limit (shown in red). For reference, synthetic poles for East Asia at 0 and 10 Ma suggested by Cogné et al. (2013) are shown as diamonds. Location of the studied area is shown as a star

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