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Table 2 Radiocarbon ages of the Mochiyama trench

From: Surface rupture and characteristics of a fault associated with the 2011 and 2016 earthquakes in the southern Abukuma Mountains, northeastern Japan, triggered by the Tohoku-Oki earthquake

Sample name Sample wall Unit Material Pretreatmenta δ13C (‰) 14C age (yr BP) Calibrated age (2σ) Lab number
WC-8 West wall 110 Charcoal AAA − 24.91 ± 0.36 247 ± 20 1636–1670 AD (74.2%)
1780–1800 AD (21.2%)
YU-7142
WC-9 West wall 114 Charcoal AAA − 27.42 ± 0.40 183 ± 20 1663–1685 AD (18.3%)
1733–1808 AD (55.4%)
1928 AD (21.7%)
YU-7143
WC-10 West wall 114 Charcoal AAA − 25.28 ± 0.43 181 ± 20 1663–1685 AD (18.3%)
1731–1809 AD (55.4%)
1927 AD (21.7%)
YU-7018
WC-11 West wall 130 Charcoal AAA − 27.21 ± 0.56 3058 ± 23 1404–1260 BC (94.6%)
1240–1236 BC (0.8%)
YU-7019
WC-14 West wall 130 Wood fragment AAA − 30.34 ± 0.32 1415 ± 20 605–657 AD (95.4%) YU-7144
WC-17 West wall 160 Twig AAA − 26.90 ± 0.37 1702 ± 20 257–296 AD (17.8%)
321–397 AD (77.6%)
YU-7145
SC-6′ South wall 160 Twig AAA − 29.08 ± 0.24 1592 ± 20 415–537 AD (95.4%) YU-7146
  1. aAAA indicates that NaOH concentration reached 1.0 mol/L in acid–alkali-acid pretreatment