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 3 Characteristics of event deposits in the KYD-trench

Event deposits	General thickness	Comparison of grain size among event deposits	General grain size	Measured thickness [cm]	Upper contact	Basal contact	Gravel content [wt%]	Roundness (well-rounded + rounded) [%]
E1	Medium	Coarse	Upper: granule to medium sand, Lower: pebble to coarse sand	3–20	–	Sharp	10–28	45–66
E2	Thin	Medium	Granule to coarse sand	1–8	Disturbed	Sharp	8–19	13–53
E3	Thick	Coarse	Granule to coarse sand	2–38	Sharp	Sharp	11–55	48–86
E4	Medium	Fine	Granule to fine sand	3–16	Disturbed	Sharp	2–18	32–41
E5	Medium	Medium	Granule to coarse sand	2–13	Disturbed	Sharp	7–24	30–56
E6	Thick	Medium	Granule to coarse sand	1–24	Sharp	Sharp	18–35	16–62
E7	Thick	Medium	Granule to coarse sand	2–28	Disturbed/sharp	Sharp	2–31	26–67
E8	Thin	Fine	Coarse to medium sand	1–7	Disturbed	Disturbed	8–10	16–45
E9	Thin	Fine	Granule to medium sand	2–18	Disturbed	Disturbed/sharp	8–17	12–42
E10	Thin	Fine	Coarse to medium sand	1–9	Disturbed	Disturbed	3–11	14–43
E11	Medium	Fine	Coarse to medium sand	2–13	Disturbed	Disturbed	3–4	50–61