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Fig. 6 | Earth, Planets and Space

Fig. 6

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. 6

Comparison of API data in VADM obtained in this study with those of the PINT database. a Published VADM data (recalculated in this study; grey cross symbols) for the past 7 Myr (actually 7 to 0.05 Ma), which were downloaded from the PINT database (version 2015.05; http://earth.liv.ac.uk/pint/; accessed July, 2018), represented as a VADM versus age plot together with the Baengnyeong Island data (yellow stars) from this study. Yellow circles and blue diamonds are, respectively, the LTD-DHT-S and T+/T + Tv data meeting the criteria (NF ≥ 3, σF ≤ 20% and having independent paleodirection determination, which must represent normal or reverse polarity) (see http://earth.liv.ac.uk/pint/ for the abbreviations of the PI methods). The thin (thick) horizontal line is the dipole intensity for the present-day (for the past approximately 5 Ma by Wang et al. 2015). The geologic time scales are also shown together with the abscissa axis. b Quartile box plots of the extracted VADM data (yellow circles and blue diamonds in Fig. 6a) including new data from this study for individual geologic time spans (0.050–0.781 Ma, 0.781–2.580 Ma, 2.580–3.600 Ma, and 3.600–5.333 Ma). Boxes represent the interquartile range, horizontal lines in the boxes are median values, and error bars represent the full range. The Arabic numeral above each upper error bar is the number used for each plot. The coordinates of boxes for x-axis are given arbitrarily. The thin and thick horizontal lines are same as the shown in a. c Histograms of the extracted VADMs for the individual geologic time spans (0.050–0.781 Ma, 0.781–2.580 Ma, 2.580–3.600 Ma, and 3.600–5.333 Ma)

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