Table S1. Sites where extensive tsunami deposits have been identified along the eastern Hokkaido coast

Site (Fig. S1) / Area / Latitude N* / Longitude E*[1] / Setting[2] / Long oriented cores logged in lab / Small cores or probes logged in field / Number of sites where tsunami deposits found / Inland extent of tsunami deposits
(m from modern shore) /
/ Deposits older than 1739 / Deposits younger than 1739 / Deposits older than 1739 / Deposits younger than 1739 /
1 / Komonbetsu / 42º 24' 22.7" / 143º 23' 13.1" / t / 2 / 10 / 10 / 0 / 170 / -
2 / Asahihama / 42º 26' / 143º 24' 24.0" / t / 4 / 25 / 25 / 0 / 680 / -
3 / Kosei / 42º 27' 15.4" / 143º 25' 19.6" / t / 2 / 5 / 5 / 0 / 170 / -
4 / Hamataiki / 42º 28' 28.4" / 143º 26' 13.1" / t / 1 / 30 / 30 / 0 / 400 / -
5 / Bisei / 42º 30' 04.9" / 143º 27' 41.4" / t / 3 / 5 / 5 / 0 / 160 / -
6 / Toberi marsh / 42º 30' 21.1" / 143º 27' 48.0" / m / 1 / 35 / 35 / 0 / 1,650 / -
7 / Horokayanto / 42º 31' 16.2" / 143º 28' 45.8" / l / 4 / 5 / 5 / 0 / 1,500 / -
8 / Bansei-onsen / 42º 31' 51.8" / 143º 29' 17.4" / t / 4 / 10 / 10 / 0 / 300 / -
9 / Oikamanai-numa River / 42º 32' 34.0" / 143º 29' 56.7" / m / 3 / 22 / 22 / 0 / 4,200 / -
10 / Oikamanai / 42º 33' 16.2" / 143º 30' 30.5" / l, m / 6 / 35 / 35 / 0 / 2,960 / -
11 / Yudo-numa / 42º 34' 37.3" / 143º 31' 33.8" / l, m / 10 / 20 / 20 / 1 / 1,050 / 780
12 / Yudo River / 42º 36' 59.1" / 143º 31' 55.6" / m / 3 / 35 / 35 / 0 / 4,800 / -
13 / Chobushi / 42º 40' 08.1" / 143º 36' 19.6" / l, m / 7 / 25 / 25 / 0 / 3,600 / -
14 / Otsu / 42º 40' 37.3" / 143º 38' 17.4" / m / 1 / 15 / 15 / 0 / 1,500 / -
15 / Tokachibuto / 42º 42' 24.3" / 143º 40' 57.8" / m / 5 / 25 / 25 / 0 / 1,300 / -
16 / Atsunai / 42º 49' 28.4" / 143º 50' 52.3" / t / 1 / 3 / 3 / 0 / 600 / -
17 / Kinashibetsu marsh / 42º 51' 05.3" / 143º 53' 11.0" / m / 7 / 30 / 30 / 0 / 1,350 / -
18 / Shakubetsu / 42º 52' 12.2" / 143º 54' 35.8" / m / 1 / 5 / 5 / 0 / 550 / -
19 / Onbetsu / 42º 53' 09.3" / 143º 56' 44.0" / t / 1 / 5 / 5 / 0 / 500 / -
20 / Pashukuru-numa / 42º 56' 03.2" / 144º 00' 11.1" / l, m / 10 / 35 / 35 / 5 / 3,750 / 300
21 / Shiranuka / 42º 56' 47.0" / 144º 03' 40.0" / m / 1 / 7 / 7 / 0 / 450 / -
22 / Koitoi / 42º 58' 53.5" / 144º 09' 44.4" / m / 1 / 5 / 5 / 0 / ~ 400 / -
23 / Otanoshike / 43º 00' 32.4" / 144º 15' 13.3" / m / 3 / 5 / 5 / 0 / 850 / -
24 / Harutori-ko (Fig. 4) / 42º 58' 04.9" / 144º 24' / l / 8 / 8 / 8 / 2 / >800 / ~ 450
25 / Tokotan-numa[3] / 43º 00' / 144º 52' 15.6" / l, m / 8 / 30 / 30 / 3 / 1,360 / 1,060
26 / Mochirippu-numa / 43º 01' 09.7" / 145º 01' 25.5" / l / 1 / 3 / 3 / 0 / - / -
27 / Hichirippu-numa / 43º 02' 13.0" / 145º 01' 33.3" / l / 1 / 3 / 3 / 0 / - / -
28 / Kiritappu marsh (cross section in Fig. 3) / 43º 03' 52.7" / 145º 05' 22.2" / m / 25 / 96 / 92 / 5 / 3,250 / 250
29 / Kiritappu marsh (line includes geoslice in Fig. 3) / 43º 04' 41.3" / 145º 06' 02.2" / m / 27 / 101 / 101 / 12 / 3,300 / 270
30 / Poroto-numa / 43º 08' 40.5" / 145º 09' / l, m / 2 / 5 / 5 / 0 / - / -
31 / Esato-numa / 43º 09' 20.3" / 145º 14' 50.0" / l, m / 1 / 3 / 3 / 0 / - / -
32 / Bettoga / 43º 11' 09.7" / 145º 25' 02.2" / m / 10 / 50 / 45 / 5 / 2,800 / 550
33 / Choboshi / 43º 14' 47.0" / 145º 33' 13.3" / l, m / 6 / 25 / 25 / 2 / 1,900 / 780
34 / Nanbu-numa / 43º 19' / 145º 37' 24.4" / l, m / 20 / 53 / 53 / 10 / 2,400 / 1,400
Total / 190 / 774 / 765 / 45

*

[1] Latitude and longitude refers to areas nearest the coast. Gray shading denotes site with details shown in Fig. 2

[2] t, terrace; m, marsh; l, lagoon, lake, or pond

[3] The stratigraphy at Tokotan-numa (site 25) summarized in Figure 2b differs from that shown by Sawai1, who reported a sand bed between volcanic-ash layers from AD 1667 (Ta-b) and 1694 (Ko-c2). Among 30 sites at Tokotan-numa, we rarely found Ta-b. We did find Ta-b at some sites near the Pacific Ocean, but we did not find a sand bed between it and Ko-c2.

1. Sawai, Y. Evidence for 17th-century tsunamis generated on the Kuril-Kamchatka subduction zone, Lake Tokotan, Hokkaido, Japan. J. Asian Earth Sci. 20, 903-911 (2002).