Re-examination of the age of historical and paleo-tsunami deposits at Koyadori on the Sanriku Coast, Northeast Japan

Ishimura, Daisuke

doi:10.1186/s40562-017-0077-4

Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Table 2 Results of radiocarbon dating

From: Re-examination of the age of historical and paleo-tsunami deposits at Koyadori on the Sanriku Coast, Northeast Japan

Sample no.	Labo no.	Sample position	Grid no.	Depth (m)	Material	δ¹³C (‰)	Conventional ¹⁴C age (yrBP)	Calibrated age (2σ) (calBP)	Remark
1	IAAA-143084	Above E3	S-1.95	0.35–0.36	Organic sediments	−24.63 ± 0.24	450 ± 20	530–490 (95.4%)
2	IAAA-143085	Above E3	S-1.95	0.38–0.39	Organic sediments	−23.94 ± 0.26	460 ± 20	530–490 (95.4%)
3	IAAA-140938	Above E3	S-1.95	0.41–0.42	Organic sediments	−23.22 ± 0.4	480 ± 20	540–500 (95.4%)
4^a	IAAA-143086	Below E3	E-11.75	0.30–0.31	Organic sediments	−25.6 ± 0.25	700 ± 20	690–650 (89.8), 590–570 (5.6%)
5^a	IAAA-143087	Below E3	E-11.75	0.32–0.33	Organic sediments	−24.29 ± 0.26	760 ± 20	730–660 (95.4%)
6^a	IAAA-143088	Below E3	E-11.75	0.34–0.35	Organic sediments	−26.5 ± 0.25	840 ± 20	790–700 (95.4%)
7	IAAA-143089	Above E4	E-11.75	0.53–0.54	Organic sediments	−25.45 ± 0.3	1270 ± 20	1270–1180 (95.4%)
8	IAAA-143090	Above E4	E-11.75	0.56–0.57	Organic sediments	−25.78 ± 0.25	1240 ± 20	1270–1170 (72.4%), 1160–1080 (23.0%)
9	IAAA-140592	Above E4	E-11.75	0.59–0.60	Organic sediments	−26.77 ± 0.61	1260 ± 20	1280–1170 (95.4%)
10^a	IAAA-131321	Below E4	E-11.75	0.74–0.76	Organic sediments	−25.78 ± 0.54	1420 ± 20	1350–1290 (95.4%)	Ishimura and Miyauchi (2015)
11	IAAA-143091	Below E4	E-11.75	0.78–0.79	Organic sediments	−24.82 ± 0.38	1560 ± 20	1530–1400 (95.4%)
12^a	IAAA-140939	Below E7	E-11.75	1.23–1.24	Organic sediments	−24.16 ± 0.53	2570 ± 30	2760–2690 (77.5%), 2640–2610 (5.2%), 2590–2500 (12.7%)
13	IAAA-140593	Above E8	E-11.75	1.31–1.32	Organic sediments	−23.54 ± 0.58	2800 ± 30	2980–2840 (91.4%), 2830–2790 (4.0%)
14^a	IAAA-140940	Below E8	E-11.75	1.35–1.36	Organic sediments	−24.7 ± 0.44	2730 ± 30	2880–2760 (95.4%)
15^a	IAAA-140594	Below E3	W-2.75	0.40–0.42	Organic sediments	−26.51 ± 0.54	580 ± 20	650–580 (64.8%), 570–530 (30.6%)
16^a	IAAA-140595	E3/E4	W-2.75	0.70–0.71	Organic sediments	−29.54 ± 0.51	1060 ± 20	1050–1020 (6.9%), 990–920 (88.5%)
17	IAAA-140596	Above E4	W-2.75	0.85–0.86	Organic sediments	−28.6 ± 0.63	1500 ± 20	1480–1460 (0.5%), 1420–1330 (94.9%)
18^a	IAAA-140941	Below E4	W-2.75	0.95–0.96	Organic sediments	−21.66 ± 0.41	1600 ± 20	1550–1410 (95.4%)
19	IAAA-140597	Above E5	W-2.75	1.11–1.12	Organic sediments	−24.99 ± 0.51	1810 ± 20	1820–1690 (94.8%), 1650–1630 (0.6%)
20^a	IAAA-140942	Below E5	W-2.75	1.19–1.20	Organic sediments	−22.3 ± 0.61	1780 ± 20	1810–1610 (95.4%)
21	IAAA-140598	Above E6	W-2.75	1.30–1.31	Organic sediments	−26.58 ± 0.56	2040 ± 30	2120–2080 (6.9%), 2070–1920 (88.1%), 1910–1900 (0.4%)
22^a	IAAA-140943	Below E6	W-2.75	1.39-1.40	Organic sediments	−24.14 ± 0.54	2240 ± 20	2340–2290 (23.5%), 2270–2150 (71.9%)
23	IAAA-140599	Above E7	W-2.75	1.46–1.47	Organic sediments	−26.26 ± 0.59	2430 ± 30	2700–2630 (19.6%), 2620–580 (6.6%), 2540–2350 (69.2%)
24	IAAA-140600	Above E9	W-2.75	1.66–1.67	Organic sediments	−27.29 ± 0.36	2910 ± 30	3160–2960 (95.4%)
25^a	IAAA-140944	Below E9	W-2.75	1.73–1.74	Organic sediments	−26.94 ± 0.53	3040 ± 30	3350–3160 (95.4%)
26	IAAA-140601	Above E10	W-2.75	1.87–1.88	Organic sediments	−26.72 ± 0.36	3270 ± 30	3580–3440 (92.7%), 3430–3400 (2.7%)
27^a	IAAA-140945	Below E10	W-2.75	1.92–1.93	Organic sediments	−25.92 ± 0.55	3180 ± 30	3460–3350 (95.4%)
28	IAAA-131669	Above E11	W-2.75	2.16–2.17	Organic sediments	−23.53 ± 0.27	3500 ± 30	3860–3690 (95.4%)	Ishimura and Miyauchi (2015)
29^a	IAAA-140946	Below E11	W-2.75	2.25–2.26	Organic sediments	−28.71 ± 0.52	3590 ± 30	3980–3830 (95.4%)

^a Samples used on the model B

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