Historical and paleo-tsunami deposits during the last 4000 years and their correlations with historical tsunami events in Koyadori on the Sanriku Coast, northeastern Japan

Progress in Earth and Planetary Science

Table 5 Major element compositions of volcanic glass shards

	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	n	Total^a
ONM-GS1-0.42	77.0	0.4	12.7	1.8	0.1	0.4	2.1	4.1	1.4	15	97.5
Ishimura et al. (2014)	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.0		0.6
NTR-Br-34.93	77.0	0.4	12.8	1.8	0.1	0.4	2.1	4.1	1.4	15	96.1
Ishimura et al. (2014)	0.3	0.1	0.2	0.1	0.1	0.0	0.1	0.3	0.1		0.7
To-a (35)	77.50	0.36	12.73	1.62	0.09	0.38	1.81	3.90	1.37	19	98.41
Aoki and Machida (2006)	0.7	0.0	0.4	0.2	0.0	0.1	0.2	0.1	0.1		1.4
To-a (36)	77.69	0.36	12.74	1.66	0.09	0.35	1.80	3.99	1.31	8	98.53
Aoki and Machida (2006)	0.6	0.1	0.3	0.1	0.0	0.0	0.1	0.2	0.0		1.3
To-a (37)	76.17	0.42	13.41	1.89	0.09	0.38	1.99	4.08	1.56	18	92.89
Aoki and Machida (2006)	0.3	0.0	0.2	0.1	0.0	0.0	0.1	0.1	0.1		1.1
KYD-TrW sec. 2 20–25 cm	77.1	0.4	12.7	1.8	0.1	0.4	2.1	4.1	1.4	15	94.4
(This study)	0.3	0.1	0.2	0.2	0.1	0.0	0.0	0.1	0.1		1.3

Number on upper line shows a mean value and that on lower line shows a standard deviation. Measured values are recalculated to 100 % on a water-free basis. Results of Aoki and Machida (2006) are shown for comparison and numbers in brackets show sample number in the reference
^aRaw data before recalculations