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Table 1 Paleomagnetic results from the Ryukyu Group in the Miyakojima Island (Anai et al. 2017)

From: Reductive chemical demagnetization: a new approach to magnetic cleaning and a case study of reef limestones

Unit Site Latitude (N) Longitude (E) Elevation (m) Facies NRM (mA/m) N0 (all samples) N (MAD < 15°) D (°) I (°) α95 (°) k VGP
Area A Area B avarage TD RCD + AFD Total TD RCD + AFD Total Latitude Longitude
1 Q-4 24°42′35″ 125°18′54″   3.0 R 1.10 6 4 10 1* 2 2 (132.6) (− 31.0) (10.7) (550.4) − 45.1 215.6
1 Q-28 24°44′42″ 125°15′38″ 4.5   R 0.725 8 5 13 1* 2 2 (186.7) (− 40.3) (60.3) (19.4) − 83.7 25.2
2 M-12 24°46′00″ 125°17′03″ 18.5   C 0.224 6 6 12 0 2 2 (196.6) (− 34.2) (18.3) (188.4) − 73.5 21.1
2 P-35 24°42′43″ 125°19′08″   18.0 C 14.0 7 6 13 0 3 3 194.8 − 33.7 21.6 33.6 − 74.9 18.2
2 A-10 24°42′59″ 125°18′38″   21.3 C 1.06 6 5 11 0 2 2 (144.5) (− 29.7) (57.2) (2.5) − 55.7 221.4
2 N-10 24°45′00″ 125°17′30″ 21.0   C 0.0765 7 5 12 0 2 2 (218.0) (− 35.3) (18.0) (47.9) − 54.5 34.9
2 P-16 24°43′09″ 125°18′48″   24.5 C 0.306 7 7 14 0 3 3 187.0 − 32.1 31.8 16.0 − 80.4 1.2
3 P-23 24°43′13″ 125°19′00″   27.5 R 0.0754 7 6 13 1 2 3 199.4 − 33.1 21.3 330.8 − 70.9 22.2
3 Q-43 24°44′11″ 125°20′50″   31.0 R 0.867 7 5 12 0 2 2 (175.2) (− 22.6) (14.1) (317.6) − 76.5 93.9
3 Q-31 24°43′09″ 125°20′30″   32.0 R 10.7 6 7 13 0 4 4 190.3 − 34.9 23.1 16.8 − 79.1 13.5
3 N-8 24°43′15″ 125°17′54″ 30.0   R 0.0752 6 6 12 2** 1 2 (178.5) (− 33.8) (52.8) (24.5) − 83.9 91.1
4 P-18 24°43′20″ 125°18′55″   34.5 R 1.44 5 6 11 0 3 3 194.7 − 45.3 26.0 23.6 − 76.5 46.2
4 Q-31-2 24°43′20″ 125°20′30″   36.5 R 0.368 7 5 12 2 0 2 (347.9) (38.4) (12.6) (96.8) 78.0 25.5
4 Q-43-2 24°43′13″ 125°20′50″   37.0 R 1.57 7 6 13 2 1 3 21.2 38.9 23.6 113.8 70.3 217.8
4 Dd-5 24°44′33″ 125°18′02″   51.0 R 0.0976 6 2 8 4 0 4 358.7 47.6 4.6 399.9 85.6 88.4
4 Ee-10 24°44′13″ 125°21′40″   70.5 R 0.954 6 2 8 3 0 3 354.7 35.5 11.6 114.6 83.1 0.4
5 Aa-18 24°47′21″ 125°18′30″ 49.5   C 2.35 5 3 8 2 1 3 351.1 37.4 21.8 32.9 81.0 17.4
5 Cc-17 24°45′37″ 125°19′05″ 54.0   C 0.235 6 0 6 4 0 4 354.8 33.2 5.2 168.2 82.0 354.7
5 Cc-13 24°45′47″ 125°19′14″ 63.0   C 0.873 6 2 8 3 0 3 9.0 36.0 35.8 12.9 80.5 236.9
5 Cc-14 24°45′46″ 125°19′14″ 65.0   C 0.463 6 0 6 5 0 5 347.0 31.9 20.9 14.3 75.9 12.2
  1. N0: number of specimens used to measurement paleomagnetic direction, the row of N0; TD: number of specimens treated with thermal demagnetization (TD), RCD + AFD: number of specimens treated with combination procedure reductive chemical demagnetization (RCD) and Alternating field demagnetization (AFD). N: number of specimens with MAD < 15°. D and I: declination and inclination of site mean direction, which is calculated from the specimens passed the criteria, respectively. α95: 95% confidence limit; k: precision parameter; facies of R and C: rhodolith limestone and coral-bioclastic-limestone, respectively. Parenthesis are reference value (n ≤ 2). *: these samples were not used to calculate a site mean palaeomagnetic direction. **: one sample was not used to calculate a site mean palaeomagnetic direction. These samples gave inconsistent directions