䊗䊷䊥䊮䉫䊂䊷䉺䈮ၮ䈨䈒ർᶏ㆏᧲ㇱෘጯḧᴪጯ࿾ၞ䈱㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷ቢᣂ਎䊋䊥䉝䉲䉴䊁䊛䈱ᓳర㊀㊁⡛ਯ䋨⨙ၔᄢቇᄢቇ㒮ℂᎿቇ⎇ⓥ⑼᣿ᴦ䉮䊮䉰䊦䉺䊮䊃㩿ᩣ㪀䋩䊶቟⮮ኼ↵䋨⨙ၔᄢቇ䊶ℂ䋩䊶৾ጊ㩷ᄥ䊶ฎᎹ┥ᄥ䋨↥✚⎇䊶࿾⾰ᖱႎ㪩㪠㪀䊶ᾢፒㄘᄦඳ䋨ෘጯ↸ᶏ੐⸥ᔨ㙚䋩䊶ᎂጾጊ㩷Ⓧ䋨㆏✚⎇࿾⾰⺞ᩏᚲ䋩Developmental processes of Holocene barrier system based on borehole data around Akashi bay area, eastern Hokkaido, JapanKey wards㧦ࡏ࡯࡝ࡦࠣ⾗ᢱ⸃ᨆ㧘ቢᣂ਎㧘ᶏ㕙ᄌേ㧘ࡃ࡝ࠕࠪࠬ࠹ࡓ㧘ർᶏ㆏᧲ㇱ㧘ෘጯḧᴪጯ࿾ၞ䋱䋮㩷໧㗴ឭ⿠䇭ab170˚50˚䉥䊖䊷䉿䉪ᶏ

Hokkaido⊕㗡ጊ
B-Tm(AD 937-938)bජፉ-䉦 䊛䉼䊞 䉾 䉦ᶏḴ

N⒩ౝ

䉥䊖䊷䉿䉪ᶏNർᶏ㆏

3

100 km-aTaD(Aᧅᏻ᧲੩ᮻ೨ἫጊKo2-c179)

D(A9161a.
(cᩮቶ1973
M 7.41952

2003
M 8.0
1856
M 7.5

ᄥᐔᵗ

20˚
140˚itybilaobr
Pචൎᴒජ

1968
M 7.9

㪉䋮ෘጯḧᴪጯ࿾ၞ䈱ᶏᴫ

1894
M 7.9

1843
M 8.0 M 8.2

ർᶏ㆏㚤䊱ጪᩮቶᴒc㊖〝30˚

130˚baM៺๟Ἣጊ4)C)

h0t

✂⿛40˚

䇭䇭ർᶏ㆏᧲ㇱᄥᐔᵗᴪጯ࿾ၞ䈮䈲䋬ᧄ㇌䈪䈲⃟䈚䈇䊋䊥䉝䉲䉴䊁䊛䈱ၸⓍ䉲䉴䊁䊛䈏ᯏ⢻䈚䈩䈇䉎䋨╙㪈࿑䋩䋮଀䈋䈳䋬ᴪጯ⍾ཚ䈪઀ಾ䉌䉏䈢ෘጯḓ䉇ෘጯḓౝ䈱਄䈕ầਃⷺᎺ䈲䈠䈱৻଀䈪䈅䉎䋮䈖䈱䉋䈉䈭䊋䊥䉝䉲䉴䊁䊛䈲䋬ᶏ㕙਄᣹ᦼ䈱ᶏጯ䈮䉋䈒⷗䉌䉏䉎࿾ᒻ䈪䈅䉍䋬਎⇇⊛䈮⷗䉎䈫䉝䊜䊥䉦ධ⷏ㇱ䈱䊐䊨䊥䉻ඨፉޯ䊜䉨䉲䉮ḧᴪጯ࿾ၞ䈱䉅䈱䈏⍮䉌䉏䈩䈇䉎䋨㪩㪼㫀㫊㫆㫅㪃㩷㪈㪐㪐㪉䋩䋮䈖䈱࿾ၞ䈱ᶏ㕙ᄌേ䈮㑐䈜䉎⎇ⓥ䈲㪤㪸㪼㪻㪸㩷 㪼㫋㩷 㪸㫃㪅㩷 㩿㪈㪐㪐㪉㪀એ㒠⎇ⓥ䈏䈾䈿ṛ䈦䈩䈍䉍䋬ᶏ㕙䈱਄᣹ᦼ䈮ᒻᚑ䈘䉏䈢䈫ផቯ䈘䉏䉎䈖䈱࿾ၞ䈱ቢᣂ਎䊋䊥䉝䉲䉴䊁䊛䈱⊒㆐᭽ᑼ䈲ᧂ䈣ቯ䈎䈫䈲⸒䈇㔍䈇䋮䈠䈱৻ᣇ䈪䋬䈖䈱࿾ၞ䈲㪇㪅㪏㪌㪺㫄㪆ᐕ䈱ㅦᐲ䈪䉟䊮䉺䊷䉰䉟䉴䊚䉾䉪䈮ᴉ㒠䈚䈩䈇䉎࿾ၞ䈪䈅䉎䈖䈫䈏⍮䉌䉏䈩䈇䉎䋨㪘㫋㫎㪸㫋㪼㫉㩷㪼㫋㩷㪸㫃㪅㪃㩷㪉㪇㪇㪋䋩䋮ෘጯḓ䈱ᄤὼ⸥ᔨ‛䇸ෘጯḓ‖⳼ፉᬀ‛⟲⪭䇹㩿㪈㪐㪉㪈ᐕᜰቯ㪀䉅ᶏ㕙ਅ䈮᳓ᴚ䈚䋬ᣢ䈮⛘Ṍ䈚䈩䈇䉎䋮䈖䉏䈲䈖䈱࿾ၞ䉕㪋㪇㪇ޯ㪌㪇㪇ᐕ๟ᦼ䈪ⷅ䈦䈩䈐䈢Ꮒᄢ࿾㔡䈱੍ళ⃻⽎䈫⠨䈋䉌䉏䈩䈇䉎䋮੍᷹䈪䈲䋬䈖䈱࿾ၞ䈱ᶏ㕙䈲✽ᢥᶏㅴ䈮䉋䉍ᕆỗ䈮਄᣹䈚䈢䈏䋬㪌㪇㪇㪇ޯ㪍㪇㪇㪇ᐕએ㒠⃻࿷䉁䈪䈾䈿஗ṛ䈚䈩䈍䉍䋬⃻࿷䈱䊋䊥䉝䉲䉴䊁䊛䉅㪈㪎਎♿䈱Ꮒᄢ࿾㔡䈮䉋䉎㪈ޯ㪉䌭䈱㓉⿠ᓟ䋬ᴉ㒠䈮ォ䈛⃻࿷䈮⥋䈦䈩䈇䉎䈫੍᷹䈚䈩䈇䉎䋨㪘㫋㫎㪸㫋㪼㫉㩷 㪼㫋㩷 㪸㫃㪅㪃㩷 㪉㪇㪇㪋䋩䋮䈠䈖䈪ᚒ䇱䈲䋬ෘጯᢎ⢒ᆔຬળ䈱දജ䉕ᓧ䈩䋬ෘጯᴪጯ࿾ၞ䈱ᴒⓍૐ࿾䈪ណข䈘䉏䈢䊗䊷䊥䊮䉫⾗ᢱ䉕⸃ᨆ䈚䋬䈠䈱ᚻ䈏䈎䉍䉕ᓧ䉎䈖䈫䉕⹜䉂䈢䋮䈘䉌䈮䋬ർᶏ㆏㐿⊒ዪ㊖〝㐿⊒ᑪ⸳ㇱ㊖〝᷼ḧ੐ോᚲ䈏㪉㪇㪇㪐ᐕ㪉᦬䈮ណข䈚䈢ෘጯ᷼᷼ḧᎿ੐䈱䊗䊷䊥䊮䉫⹜ᢱ䉕䋬ฎ↢‛ቇ⊛䋬ၸⓍቇ⊛ᚻᴺ䉕↪䈇䈩⸃ᨆ䈚䋬㜞♖ᐲ䈭ᐕઍ᷹ቯ䉕ⴕ䈦䈩ᤨ㑆ゲ䉕౉䉏䉎䈖䈫䈮䉋䉍㆏᧲ᄥᐔᵗᴪጯ࿾ၞ䈱ᶏ᳓Ḱᄌേᦛ✢䉕᳞䉄䋬࿾Ზᄌേ䈮䉋䈦䈩ᡰ㈩䈘䉏䈢ቢᣂ਎䊋䊥䉝䉲䉴䊁䊛䈱⊒㆐᭽ᑼ䈱ో⽩䉕᣿䉌䈎䈮䈚䈢䈇䈫⸘↹䈚䈢䋮

8.6

fMo䇭Ḵᶏ䇭ፉ䇭㩿㪈㪀㩷 ầ᳤䋺ᄢầᤨ䈱㜞ầ૏㪂㪈㪌㪇㪺㫄䋬ૐầ૏㪄㪈㪇㪺㫄䈪䈅䉍䋬ᦨᄢầᏅ䈲㪈㪍㪇㪺㫄䋬හ䈤㪤㫀㪺㫉㫆㫋㫀㪻㪸㫃䈪䈅䉎䋮ᄢầ䈱ਅ䈕ầᤨ䋬ෘጯḧ䈪䈲ḓධ䈮ᴪ䈦䈢㪪㪮ᣇะ䈫ḓർ䈮ᴪ䈦䈢㪮ᣇะ䋬ෘጯḓౝ䈪䈲ọ╭䈮෼᧤䈜䉎䉋䈉䈭㪥㪮䌾㪪㪮ᣇะ㪅೎ኙㄝ‐Ꮉ䈎䉌䈱㪪ᣇะ䈫ḓᅏ䈎䉌ầᵹญ䈮ะ䈎䈦䈩ᵹ䉏䉎㪅ᵹㅦ䈲㪃೎ኙㄝ‐Ꮉ䈎䉌ḓർ䈱⍾ཚ䈮䈹䈧䈎䉎࿾ὐ䈪㪇㪅㪏㪌䌾㪇㪅㪐㪌㫄㪆㫊䈫ㅦ䈒㪃ᰴ䈇䈪ọ╭䈮䈍䈇䈩㪇㪅㪎㪌䌾㪇㪅㪏㪌㫄㪆㫊䈪䈅䉎䋮৻ᣇ䋬਄ầᤨ䈲䋬ෘጯḧ䈮䈍䈇䈩ḧญㇱ䈎䉌㪥ᣇะ䈱ᵹ䉏䈏ầᵹญ䈮෼᧤䈜䉎䉋䈉㒽࿾䈮ᴪ䈦䈩㪥䌾㪜ᣇะ䈫䈭䈦䈩ᵹ౉䈜䉎㪅ෘጯḓౝ䈪䈲ọ╭䈮ᴪ䈦䈩ᵹ౉䈚㪃䈠䈱ᓟḓጯ䈮ᴪ䈦䈩ḓᅏ䈻䈫ᵹ䉏䉎㪅ᵹㅦ䈲㪃ầᵹญ䈪㪇㪅㪐䌾㪇㪅㪐㪌㫄㪆㫊䈫ㅦ䈒㪃ᰴ䈇䈪ọ╭䈮䈍䈇䈩㪇㪅㪎㪌䌾㪇㪅㪏㪌㫄㪆㫊䈪䈅䉎䋨╙㪊࿑㪸䋩㪅㩿㪉㪀ᵄᶉ䋺ෘጯḧ䈮䈍䈇䈩㪃㜞ᵄᶉ䈮䈭䉎ᵄะ䈲㪪㪪㪜ᣇะ䈪ᦨᄢ㪉㪅㪋㪎㫄㪅ෘጯḓౝ䈮䈍䈇䈩䈲㪃㪇㪅㪈䌾㪇㪅㪉㫄䈱ᵄ㜞䈏ో૕䈱㪐ഀએ਄䈪䈅䉍ᦨᄢᵄ㜞䈲㪇㪅㪊㫄䋬ᦨᄢ᦭⟵ᵄ㜞䈲㪉㪅㪋㪎㫄䈪䈅䉎䋮ᵄะ䈲䋬ෘጯḧ䈱ਛᔃ䈪䈲ḧญᣇะ䈪䈅䉎㪪㪜䌾㪪㪪㪜䈏㪃ᴪጯ䈪䈲㪪㪪㪜䈱ᵄะ䈏ථ⿧䈜䉎㪅ෘጯḓౝ䈲᣿⍎䈪䈲䈭䈇䈏㪮䈱ᵄะ䈏ᦨᄢ䈱㗫ᐲ䈪䈅䉎㪅๟ᦼ䈲䋬ෘጯḧ䈱ਛᔃ䈪䈲㪍㪅㪇㫊㪼㪺એ਄䈱๟ᦼ䈏ᄙ䈒㪃ᵄ㜞䈏㪉㫄䉕⿥䈋䈢ᤨ䈱๟ᦼ䈲᭎䈰㪍㪅㪎䌾㪏㪅㪋㫊㪼㪺䈪䈅䉎㪅ᴪጯ䈪䈲๟ᦼ㪊㪅㪇䌾㪍㪅㪇㫊㪼㪺䈱භ䉄䉎ഀว䈏ᄙ䈒㪃ᵄ㜞䈏㪈㫄䉕⿥䈋䈢ᤨ䈱๟ᦼ䈲᭎䈰㪋㪅㪉䌾㪏㪅㪉㫄䈪䈅䉎㪅ෘጯḓౝ䈪䈲㪊㪅㪇㫊㪼㪺એਅ䈫⍴䈇๟ᦼ䈏ᄙ䈇䋮ෘጯḧ䈱ਛᔃ䈪䈲㪃㪈㪅㪇㫊㪼㪺એ਄䈱಴⃻₸䈏㪈㪇㩼⒟ᐲ䉕䈚䉄䈩䈍䉍㪃䈉䈰䉍䈏ᄖᵗ䈎䉌ḧญ䉕⚻䈩᧪ⷅ䈚䈩䈇䉎䈫⠨䈋䉌䉏䉎㪅ᵹะ㪃ᵹㅦ䈲䋬ෘጯḧ䈱ਛᔃ䈪䈲㪈㪍ᣇ૏ో૕䈱㗫ᐲ䈏ห╬䈮ㄭ䈇䈏㪃ḧญ䈎䉌ḧᅏ䈻ะ䈎䈉㪮㪥㪮䌾㪜㪥㪜䈱ᵹะ㗫ᐲ䈏᭎䈰㜞䈇㪅ᵹㅦ䈲㪉㪅㪈䌾㪋㪅㪇㫄㪆㫊㪼㪺䈱㗫ᐲ䈏ᄙ䈇㪅ᴪጯ䈪䈲ᴪጯ䈮ᐔⴕ䈭㪪㪮㪃㪥㪜ᣇะ䈱㗫ᐲ䈏㜞䈇䈏㪃㪈㪉㪅㪇㪺㫄㪆㫊㪼㪺એ਄䈱ᒝ䈇ᵹ䉏䈏⊒↢䈜䉎䈱䈲㪮㪪㪮㪃㪥㪜㪃㪜㪥㪜䈱ᵹ䉏䈪䈅䉎㪅ෘጯḓౝ䈪䈲ḓญ䈎䉌ḓᅏ䉕⚿䈹㪜㪃㪮ᣇะ䈱ᵹ䉏䈏ථ⿧䈚㪃㪈㪉㪅㪇㪺㫄㪆㫊㪼㪺એ਄䈱ᒝ䈇ᵹ䉏䉕฽䉂ථ⿧䈚䈩䈇䉎䈱䈲㪜䈪䈅䉎䋨╙㪊࿑㪸䋩㪅

8 cm/yearᄥᐔᵗ䊒䊧䊷䊃
43˚30'

㪊䋮㩷⎇ⓥᚻᴺ

ᩮቶ
N㊖〝ෘጯ

30 kmc╙3࿑ 145˚

ᄥᐔᵗ

Ḩේ࿾ၞ

43˚

146˚

╙䋲࿑㪅㩷㪈㪏㪌㪇ᐕઍ䈮ឬ䈎䉏䈢઄บ⮲᧲Ⲍᄱ࿾⚻༡࿑䋨Ꮢ┙ವ㙚࿑ᦠ㙚⬿䋩䋮╙䋱࿑㪅㩷ർᶏ㆏๟ㄝ䈱䊁䉪䊃䊆䉪䉴䋬ජፉᶏḴ๟ㄝ䈱ᶏḴဳ࿾㔡㩷㩿㪸㪀㪃㩷ർᶏ㆏᧲ㇱ䋬ᩮ㊖ᶏጯ࿾ၞ䈱૏⟎࿑㩷㩿㪹㪀㪃㩷ෘጯḧᴪጯၞ䈱૏⟎࿑㩷㩿㪺㪀㪅㩷ᮻ೨Ἣጊ䋬ർᶏ㆏㚤䊱ጪ䋬⊕㗡ጊ䋬៺๟Ἣጊ䈱૏⟎䉅࿑ਛ䈮␜䈜䋮a㩿㪈㪀㩷 ᐔᚑ㪈㪇ޯ㪈㪋ᐕᐲ䈮ෘጯḧᴪጯ࿾ၞ䈪ታᣉ䈘䉏䈢౏౒Ꮏ੐෸䈶ᐔᚑ㪉㪇䋬㪉㪈ᐕᐲ䈱ෘጯṪ᷼࿾⾰⺞ᩏ䈱࿾⾰⺞ᩏႎ๔ᦠ䈮␜䈘䉏䈢䋬䉮䉝㐳㪌䌭䈎䉌㪍㪇䌭䈮䈍䉋䈹⸘㪉㪏ᧄ䈱࿾⾰ᩇ⁁࿑䈱࿯⾰඙ಽ䉇ጤ⋧඙ಽ䈱⸥ㅀ䉕䋬ෘጯ↸䈍䉋䈶ർᶏ㆏㐿⊒ዪ䈱දജ䉕ᓧ䈩෼㓸䈚䈢䋮․䈮䋬☸ᐲ඙ಽ䉕␜䈚䈢࿾⾰ᩇ⁁࿑䈮䈧䈇䈩ᮡ㜞䉕ၮḰ䈮ᢛℂ䈚䋬᷹✢䈮ᴪ䈦䈢࿾⾰ᢿ㕙࿑䉕૞ᚑ䈚䈢䋮䈖䈱㓙䋬㪤㪸㪼㪻㪸㩷㪼㫋㩷㪸㫃㪅㩷㩿㪈㪐㪐㪉㪀䋬ᷝ↰䈾䈎䋨㪉㪇㪇㪋䋩䈱౏⴫䊂䊷䉺䉅䈖䉏䈮฽䉄䈢䋨╙㪊࿑㪹䋩䋮㩿㪉㪀㩷 ᐔᚑ㪉㪈ᐕ㪉᦬䈮ർᶏ㆏㐿⊒ዪ㊖〝᷼ḧ੐ോᚲ䈏ታᣉ䈚䈢ෘጯ᷼ḧᎿ੐䈪ᓧ䉌䉏䈢࿯ᧁ⹜㛎↪䈱৻ㇱᡬੂ⁁ᘒ䈪ណข䈘䉏䈢ᶏᐩ䊗䊷䊥䊮䉫⹜ᢱ䋨એਅ䋬ෘጯ䉮䉝䋻᳓ᷓ㪉㪅㪐䌭䈎䉌䉮䉝㐳㪌㪐㪅㪉㪉䌭䉕ជ೥䋩䉕↪䈇䈩䋬ၸⓍ⋧⸃ᨆ䋬౮⌀᠟ᓇ䋬ಽశ᷹⦡⸘䋨㪤㪠㪥㪦㪩㪬㪫㪘䋨ᩣ䋩⵾㩷 㪪㪧㪘㪛㪄㪌㪇㪊䋩䉕↪䈇䈢㪣㪁㪸㪁㪹㪁䈱᷹ቯ䋬฽ᵆ₸᷹ቯ䈍䉋䈶☸ᐲಽᨆ䋬⽴Ზㆮ㜈䈱⟲㓸⸃ᨆ䈍䉋䈶ฎⅣႺ⸃ᨆ䋬㪘㪤㪪㪈㪋㪚ᐕઍ᷹ቯ䋨䋨ᩣ䋩ടㅦེಽᨆ⎇ⓥᚲ䋬䋨ᩣ䋩䊌䊧䉥䊤䊗䋩䉕ታᣉ䈚䈢䋮䈘䉌䈮䋬ෘጯ䉮䉝䈱⸃ᨆ⚿ᨐ䈮ၮ䈨䈇䈩䋬㩿㪈㪀䉕⸃㉼䈚⋥䈚䈢䋮㩿㪊㪀㩷ෘጯޯᩮቶᴪጯ࿾ၞ䈱ᣢሽᢥ₂䋨᧖᧛㪃㩷㪈㪐㪏㪋䋻ᄢᐔ䈾䈎㪃㩷㪈㪐㪐㪋䋻㪤㪸㪼㪻㪸㩷㪼㫋㩷㪸㫃㪅㪃㩷㪈㪐㪐㪉䋻ᴛ੗䊶ਃႮ㪃㩷㪈㪐㪐㪏䋻᧻ፉ㪃㩷㪉㪇㪇㪍䋻㪢㪼㫃㫊㪼㫐㩷㪼㫋㩷㪸㫃㪅㪃㩷㪉㪇㪇㪍䋻Ỉ੗㪃㩷㪉㪇㪇㪎䋩䈍䉋䈶㩿㪉㪀䈪ᓧ䉌䉏䈢ᣂⷙᐕઍ୯䈮ၮ䈨䈇䈩䋬ቢᣂ਎ᶏ᳓Ḱᄌേᦛ✢䉕✬➏䈚䈢䋮䈘䉌䈮䋬䈖䈱ᖱႎ䈮ၮ䈨䈇䈩䋬ෘጯḧᴪጯ࿾ၞ䈱䊋䊥䉝䉲䉴䊁䊛䈱㐿ᆎᤨᦼ䉇ᒰᤨ䈱᳓ᷓ䈱ᬌ⸛䉕ⴕ䈦䈢䋮ฯҤḵḳฯ҅
N฻ҾA'A

ᮡ㜞(m)
5NWNW

65
5$

0

A -2

A -1

A -4

A -5ᵒᵎᵎᴾᶋ

⍾ཚ

A -3
A -6

A -10
A -7

A -8

A -11

A -9

NNE
A'''

ESEA''

ầᵹӝ
A -13

A -16

A -17

A -14

A -12-5

К݊ᡀཅ߷

A -15-10

ඕ߷
-15

࠮๽

ᵆ὇

-20

100(m)Aො⍾␕ɥƛກɤᚌ߸
ჿ֜

A'

ҽެฯ

A''

C'⍾
ᵆ὇

Lagoonal Facies

⍾␕
␕⾰䉲
䊦䊃

Barria Facies?

⍾ȩǰȸȳ
-35

B'

Marsh Facies⴫࿯䊶 ⋓࿯

-25-30BC

࠮๽A'''

ჿ֜65
5$

⴫࿯䊶 ⋓࿯

䉲䊦䊃␕⾰䉲 䊦䊃

Barria Facies?

䉲 䊦䊃䉲䊦䊃 ⾰☼࿯

Inner Bay Facies䉲 䊦䊃 ⾰☼࿯T idal Flat Facies☼࿯☼࿯Ma-f(7.5 ka)

Lacustrine Faciesၮ⋚ጤၮ⋚ጤ
-40

࠮๽
C??

a-45

ҽެฺ

-50

ථ⿧ᵹะ

ḳฺᵆᵬᵵᵇầ᳤ᵹ䋨ਅ䈕ầ䊶਄䈕ầ䋩

-55

ᮡ㜞(m)

ථ⿧ᵄะ

2000 m

B

5-60

B'B-2
B-2

B-1-65䊤 䉫䊷䊮

144 50 00b

N65ᵆᵱᵣᵇᨕḵ

0ກ්ӝ ⍾ཚ

-70਄䈕ầầ᳤ਃⷺᎺ

-75-5

A -1 A -2 A -3 A -4
A -5
AA -6
A -7 A -8⍾ཚ
A -9 A -10
A -11
ầᵹญ
A -12
A -13
A -17 A -16 A -15 A -14
⍾ཚ
B-1
B-2
B-3C-1 C-2 C-3 C-4
C-5C-6C-7
C-8
C-9
2000 m
C-10 C-11 C-12 C-13 C-14

200 m
-10

ḳฺᴾᵆᵵᵇC'C''
C-14

ᮡ㜞(m)
5C-1C-3C-2C-4

C-5C-6C-11C-10C-7

C-13
C-12C-9
C-80

43 02 00
-5-1065  5$-15

%[T$2-20

-25

200 m

-30

11000

Age (cal yrs BP)

10000

9000

8000

7000

6000

5000

4000

3000

2000

1000

0

HWL=1.50m

vcs

cs

ms

fs

vfs

siltclay

ᵆᵣᵇᨕḵ

C

12000
5Altitude (m)╙㪊࿑㪅㩷ෘጯḧᴪጯၞ䈱ᶏᴫ㩿㪸㪀䈍䉋䈶㪘㪄㪘㵭㵭㵭㪃㩷㪙㪄㪙㵭㪃㩷㪚㪄㪚㵭㵭᷹✢䋬䊗䊷䊥䊮䉫⾗ᢱ૏⟎࿑㩿㪹㪀䈍䉋䈶ቢᣂ਎䊋䊥䉝䉲䉴䊁䊛䉕␜䈜࿾ᒻ䊶࿾ጀᢿ㕙࿑䋮૏⟎࿑䈮䈲㪞㫆㫆㪾㫃㪼㩷㪜㪸㫉㫋㪿䉕૶↪䈚䈢䋮䃨䈲੹࿁੍ኤ⊛䈮⸃ᨆ䈚䈢ᶏ਄䊗䊷䊥䊮䉫⹜ᢱណข࿾ὐ䋨㪘㪄㪈㪋䋩䋮

0 LWL=-0.10m

0uppershorefacelower
shoreface

Altitude(m)Barria Facies
Inner Bay Facies

Ta-d (ca. 9.1 ka)

H-20-(3)(-13.30m)

H-20-1(-9.85m)

tidal channel

-20

-30

viscosity model C (Maeda et al.,1992)

-10

-10

H-20-(1)(-6.23m)

H-21-5(-6.76m)-5

innershelfH-20-A(-13.65m)-15

sea-level
curve

-20

depositional curve

H-20-(4)(-17.30m)
H-20-2(-23.87m)

-25

peat

H-20-(5)(-22.30m)

shellscale

H-20-1-(6)(-27.30m)-30H-20-C Ta-d (ca. 9.1 ka)(-30.90m)

-35

plant

H-20-(2)(-8.30m)

Akkeshi (Sugimura,1984)
Chiraikaribetsu (Sawai and Misio, 1998)
Mochirippu (Sawai et al., 2009)
Hichirippu (Sawai, 2007)
Kiritappu(Sawai et al.,2009; Maeda et al.,2009

Bekanbeushi (Matsushima.,2006㧕

new AMS data

H-20-1-(7)(-39.30m)-40
Tid al Flat Facies-40

TS
Lacust r ine Facies

-50

-60

sandy
tidal flat
muddy
tidal flat

Clay

Silt

Laminatioms

H-21-2(-46.86m)-50

H-20-3(-43.85m)

TS at ca. 11.4 ka
H-20-D (-49.7m)-55
lacustrine

SB at ca. 13.8 ka-60

SBSand-45

䋴䋮䉁䈫䉄H-20-1-(8)(-39.30m)

H-20-E (-60.8m)
PebblesBurrows

Mud clasts

WoodShells

Plant╙㪋࿑㪅㩷ෘጯ᷼㪘㪄㪈㪋࿾ὐ䈮䈍䈔䉎䊗䊷䊥䊮䉫䉮䉝䈱ၸⓍᩇ⁁࿑䋬ၸⓍㅦᐲᦛ✢䈍䉋䈶㆏᧲ᴪጯ࿾ၞ䈱ᶏ㕙ᄌേᦛ✢䋮㩿㪈㪀㩷 ෘጯ䉮䉝䈱⸃ᨆ䉋䉍䋬ෘጯ↸ḓർ࿾඙䈎䉌ḓධ࿾඙䈮䉁䈢䈏䉎㪘ᢿ㕙䈫ḓධ࿾඙䈱ಳ࿾ᒻ䉕ᮮᢿ䈜䉎㪙䋬㪚ᢿ㕙䈱✚⸘㪊ᨎ䈱࿾⾰ᢿ㕙࿑䉕૞ᚑ䈚䈢䋮䈖䉏䈮䉋䈦䈩䋬⃻࿷䈱ෘጯ↸Ꮢⴝ࿾䈱┙࿾䈜䉎ᴒⓍૐ࿾䈱䋬ቢᣂ਎䊋䊥䉝䉲䉴䊁䊛䈮ᡰ㈩䈘䉏䈢⊒㆐᭽ᑼ䈱᭎ⷐ䈏ᛠី䈪䈐䈢䋮ḓർ࿾඙ޯෘጯᄢᯅ๟ㄝ䋨㪘㪄㪘㵭㵭㵭᷹✢䋩䈮䈍䈇䈩䈲䋬ᦨ⚳᳖ᦼ䈮ਅೞ䈘䉏䈢ṃ䉏⼱䈏ᶏᚑၸⓍ‛䈮䉋䈦䈩ၒⓍ䈘䉏䋬䈠䈱਄૏䉕⃻࿷䈱⍾ཚ䈱࿾ᒻ㕙䉕᭴ᚑ䈜䉎☻☸ၸⓍ‛䈏⚥㊀䈚䈩䈇䉎⁁ᴫ䈏⺒䉂ข䉏䈢䋮৻ᣇḓධ࿾ၞ䋨㪙㪄㪙㵭䋬㪚㪄㪚㵭㵭䋩䈪䈲䋬ḓญ䉕ᴪጯ⍾ཚ䋨䊋䊥䉝䋩䈪઀ಾ䉌䉏䈢ዊⷙᮨ䈭䊤䉫䊷䊮䈏㪉▎ᚲሽ࿷䈚䋬⃻࿷䈲ၒⓍ䈘䉏Ḩේൻ䈚䈢䈖䈫䈏ಽ䈎䈦䈢䋮䈖䈱䊤䉫䊷䊮䈱৻ㇱ䈲ᳯᚭᤨઍᓟᦼ䋨㪈㪏㪋㪇㪄㪈㪏㪌㪇ᐕઍ䋩䈱ฎ࿾࿑䋨╙䋲࿑䋩䈮䈍䈇䈩䉅䈠䈱ሽ࿷䈏⏕⹺䈘䉏䈢䋮㩿㪉㪀㩷 ෘጯ䉮䉝䈱⸃ᨆ⚿ᨐ䈮ၮ䈨䈐䋬㪋䈧䈱ၸⓍ䊡䊆䉾䊃䈮඙ಽ䈚䈢䋮ᦨਅ૏䈱㪣㪸㪺㫌㫊㫋㫉㫀㫅㪼㩷 㪝㪸㪺㫀㪼㫊䋨ᮡ㜞㪄㪍㪈ޯ㪄㪌㪇䌭䋩䈲ၮ⋚䈪䈅䉎ᩮቶጀ⟲䉕ਇᢛว䈪ⵍ㧕䈇䋬䈠䈱਄㕙䈲ᶏㅴ㕙䈪ᶐ㘩䈘䉏䉎䋮ᧄ䊡䊆䉾䊃䈲ḓᴧᚑ䈱ᵆጀ䈎䉌䈭䉍䋬䈠䈱ᦨਅ૏ጀḰ䈎䉌⚂㪈㪈㪃㪐㪇㪇㩷㪺㪸㫃㩷㫐㫉㩷㪙㪧䋨ᮡ㜞㪄㪍㪇㪅㪎㪌䌭䋩䈱ᐕઍ୯䈏ᓧ䉌䉏䈢䋮㪫㫀㪻㪸㫃㩷 㪝㫃㪸㫋㩷 㪝㪸㪺㫀㪼㫊䋨ᮡ㜞㪄㪌㪇ޯ㪄㪋㪇䌭䋩䈲䉣䉴䉼䊠䉝䊥䊷ᚑ⍾⾰ᵆጀ䈎䉌ᚑ䉎䋮↥಴䈲⒘䈪䈅䉎䈏䋬฽䉁䉏䉎⽴Ზㆮ㜈䈲ầᐓᏪޯ᳓ᷓ㪉㪇䌭䈮↢ᕷ䈜䉎
Chlamys farreri䈫Callithaca adams㫀䈪䈅䉎䋮䉁䈢䋬ᧄ䊡䊆䉾䊃ᦨਅ૏ጀḰ䈎䉌⚂㪈㪈㪃㪊㪇㪇㩷 㪺㪸㫃㩷 㫐㫉㩷 㪙㪧䋨ᮡ㜞㪄㪋㪐㪅㪎䌭䋩䈱ᐕઍ୯䈏ᓧ䉌䉏䈢䋮㪠㫅㫅㪼㫉㩷 㪙㪸㫐㩷㪝㪸㪺㫀㪼㫊䋨ᮡ㜞㪄㪊㪐ޯ㪄㪉㪊䌭䋩䈲ෘጯ䉮䉝ਛ䈪ᦨ䉅⚦☸䈭ᶏᚑᵆጀ䈎䉌ᚑ䉎䋮⽴Ზㆮ㜈䈲Ꮧ䈪䈅䉎䈏䋬ầ㑆Ꮺޯ᳓ᷓ㪉㪇䌭䈮↢ᕷ䈜䉎Reticunassa
multigranosa㪃㩷Callithaca adamsi㪃㩷Ruditapes philippinarum䈏↥಴䈜䉎䋮ᧄ䊡䊆䉾䊃䈎䉌䈲䋬㪫㪸㪄㪻ἫጊἯ䋨㪺㪸䋮㪐㪅㪈㫂㪸䋩⹺䉄䉌䉏䈢䋮ᧄ䊡䊆䉾䊃䈲⃻࿷䈱ෘጯḧᐩ䈱⚦☸ᵆጀ䋨᳓ᷓ⚂㪌ޯ㪉㪇䌭䋩䈮ኻᲧ䈪䈐䉎䋮ᦨ਄૏䈱㪙㪸㫉㫉㫀㪼㫉㩷㪝㪸㪺㫀㪼㫊䋨㪄㪉㪊ޯ㪄㪉㪅㪐䌭䋩䈲᣿⏕䈭਄ᣇ☻☸ൻ䉕␜䈜⍾␕ጀ䈪䈅䉍䋬⃻࿷䈱ᴪጯ⍾ཚ䈱࿾ᒻ㕙䉕᭴ᚑ䈜䉎䋮ᧄ䊡䊆䉾䊃䈎䉌䈲ᐓẟ᫮⒳䈱Batillaria cumingii㪃㩷Ruditapes philippinarum䈭䈬䈏ᄙ↥䈚䋬⚂㪎㪋㪇㪇㩷㪺㪸㫃㩷㫐㫉㩷㪙㪧䋨ᮡ㜞㪄㪈㪊㪅㪍㪌䌭䋩䈫⚂㪊㪊㪇㪇㩷㪺㪸㫃㩷㫐㫉㩷㪙㪧䋨ᮡ㜞㪄㪈㪊㪅㪊㪇䌭䋩䈪䈲ᮡ㜞㪄㪈㪊㪅㪌䌭䈱ầ᳤䉼䊞䊈䊦ၮᐩ䉕Ⴚ䈫䈚䈩䋬⚂㪋㪇㪇㪇ᐕ䈱ጀᐨ䈱ᰳ⪭䈏⹺䉄䉌䉏䉎䋮䋨╙㪋࿑䋩䋮㩿㪊㪀㩷ෘጯ䉮䉝䈱ᐕઍ᷹ቯ䈍䉋䈶૞ᚑ䈘䉏䈢ᶏ㕙ᄌേᦛ✢䈮䉋䉍䋬ෘጯᄢᯅઃㄭ䈪䈱ᶏㅴ㕙䈲ᮡ㜞㩷㪄㪌㪇㫄䈮ሽ࿷䈚䋬䈠䈱ᐕઍ䈲⚂㪈㪈㪃㪊㪇㪇㩷ᐕ೨䈫ផቯ䈘䉏䉎䋮䉁䈢䋬ᒰ࿾ၞ䈮䈍䈇䈩ᶏㅴᦼ䊋䊥䉝䉲䉴䊁䊛䈏㐿ᆎ䈘䉏䈢䈱䈲⚂㪏㪃㪏㪇㪇ᐕ೨䈪䈅䉍䋬䈠䈱㓙䈱᳓ᷓ䈲⚂㪐䌭䈪䈅䈦䈢䋨╙㪋࿑䋩䋮㩿㪋㪀㩷㆏᧲ᄥᐔᵗᴪጯ䈮䈍䈇䈩⏕⹺䈘䉏䈩䈇䉎ᦨ䉅ฎ䈇䉦䉨␂䈱ᐕઍ୯䈲䋬⚂㪌㪃㪌㪇㪇䇭㪺㪸㫃㩷㫐㫉㩷㪙㪧䋨ᩮቶᏒ䊉䉿䉦䊙䉾䊒Ꮉૐ࿾䋻㪤㪸㪼㪻㪸㩷㪼㫋㩷㪸㫃㪅㪃㪈㪐㪐㪉䋩䈪䈅䉎䈏䋬ෘጯḧᴪጯ࿾ၞ䈮䈍䈇䈩䉅ᶏ㕙䈏஗ṛ䈮ォ䈛䈢⚂㪌㪃㪊㪇㪇ᐕ೨䈮਄䈕ầਃⷺᎺ਄䈮䉦䉨␂䈏⊒↢䈚䋬䈾䈿⃻⁁䈮⥋䈦䈩䈇䉎䈫ផ᷹䈘䉏䉎䋨╙㪋࿑䋩䋮ᒁ↪ᢥ₂䋺䇭㪘㫋㫎㪸㫋㪼㫉㪃㩷㪙㪅㪝㪅㩷㪼㫋㩷㪸㫃㪅㪃㩷㪉㪇㪇㪋㪃㩷㪫㪿㪼㩷㪟㫆㫃㫆㪺㪼㫅㪼㪃㩷㪈㪋㪃㩷㪋㪏㪎㪄㪌㪇㪈㪅㩷㪤㪸㪼㪻㪸㪃㩷㪰㪅㩷㩷㪼㫋㩷㪸㫃㪅㪃㩷㪈㪐㪐㪉㪃㩷㪞㪼㫆㫇㪿㫐㪅㩷㪩㪼㫊㪅㩷㪣㪼㫋㪅㪃㩷㪈㪐㪃㩷㪏㪌㪎㪄㪏㪍㪇㪅㩷᧻ፉ⟵┨䋬㪈㪐㪏㪋䋬␹ᄹᎹ⋵┙ඳ‛㙚⎇ⓥႎ๔䋨⥄ὼ⑼ቇ䋩䋬㫅㫆㪅㩷㪈㪌䋬㪊㪎㪄㪈㪇㪋㪅᧻ፉ⟵┨㪃㩷㩷㪉㪇㪇㪍㪃㩷⽴䈏⺆䉎✽ᢥᶏㅴ㪅᦭㓞ᣂᦠ㪃㩷㪉㪈㪐㫇㪅㩷㩷㪩㪼㫀㫊㫆㫅㪃㩷㪞㪅㪜㪅㪃㩷㪈㪐㪐㪉㪃㩷㪝㪸㪺㫀㪼㫊㩷㪤㫆㪻㪼㫃㪃㩷㪞㪼㫆㫃㫆㪾㫀㪺㪸㫃㩷㪘㫊㫊㫆㪺㫀㪸㫋㫀㫆㫅㩷㫆㪽㩷㪚㪸㫅㪸㪻㪸㪃㩷㪈㪎㪐㪄㪈㪐㪋㪅㩷ᷝ↰㓶ੑ䈾䈎䋬㪉㪇㪇㪋䋬࿾⾰ቇ⺰㓸䋬㫅㫆㪅㩷㪌㪏㪃㪍㪊㪄㪎㪌㪅㩷㪢㪼㫃㫊㪼㫐㪃㩷㪟㪅㪃㩷㪼㫋㩷㪸㫃㪅㪃㩷㪉㪇㪇㪍㪃㩷㪞㪼㫆㫇㪿㫐㫊㫀㪺㪸㫃㩷㪩㪼㫊㪼㪸㫉㪺㪿㩷㪣㪼㫋㫋㪼㫉㫊㪃㩷㪊㪊㪃㩷㪣㪈㪊㪊㪈㪌㪃㩷㪻㫆㫀㪑㩷㪈㪇㪅㩷㪈㪇㪉㪐㪆㪉㪇㪇㪍㪞㪣㪇㪉㪍㪇㪌㪉㪅㩷㪤㪸㪼㪻㪸㪃㩷㪰㪅㪃㩷㪼㫋㩷㪸㫃㪅㪃㩷㪞㪼㫆㫇㪿㫐㫊㫀㪺㪸㫃㩷㪩㪼㫊㪼㪸㫉㪺㪿㩷㪣㪼㫋㫋㪼㫉㫊㪃㩷㪈㪐㪃㩷㪏㪌㪎㪄㪏㪍㪇㪅㩷㩷Ỉ੗␭♿㪃㩷㪉㪇㪇㪎㪃㩷╙྾♿⎇ⓥ㪃㩷㪋㪍㪃㩷㪊㪍㪊㪄㪊㪏㪊㪅㩷㩷㪪㪸㫎㪸㫀㪃㩷㪰㪅㪃㩷㪼㫋㩷㪸㫃㪅㪃㩷㪉㪇㪇㪐䋬㪡㫆㫌㫉㫅㪸㫃㩷㫆㪽㩷㪞㪼㫆㫇㪿㫐㫊㫀㪺㪸㫃㩷㪩㪼㫊㪼㪸㫉㪺㪿㪃㩷㪈㪈㪋㪃㩷㪙㪇㪈㪊㪈㪐㪃㩷㪻㫆㫀㪑㪈㪇㪅㪈㪇㪉㪐㪆㪉㪇㪇㪎㪡㪙㪇㪇㪌㪌㪇㪊䋮ᴛ੗␭♿䊶ਃႮ๺᱌ሶ㪃㩷㪈㪐㪐㪏㪃㩷╙྾♿⎇ⓥ㪃㩷㪊㪎㪃㩷㪈㪄㪈㪉㪅㩷㩷ᷝ↰㓶ੑ䈾䈎㪃㩷㪉㪇㪇㪋㪃㩷࿾⾰ቇ⺰㓸㪃㩷㫅㫆㪅㩷㪌㪏㪃㩷㪍㪊㪄㪎㪌㪅㩷㩷᧖᧛䇭ᣂ㪃㩷㪈㪐㪏㪋㪃㩷ᤘ๺㪌㪐ᐕᐲ⑼ቇ⎇ⓥ⾌⵬ഥ㊄㩷㩿✚ว㪘㪀㩷⎇ⓥᚑᨐႎ๔ᦠ䋬㪈㪏㪄㪉㪊㪅㩷㩷ᄢᐔ᣿ᄦ䈾䈎㪃㩷㪈㪐㪐㪋㪃㩷╙྾♿
⎇ⓥ㪃㩷㪊㪊㪃㩷㪋㪌㪄㪌㪇㪅㩷㩷ጊᧄቁᐢ䈾䈎㪃㩷㪉㪇㪈㪇㪃㩷࿾⾰⺞ᩏ⎇ⓥႎ๔㪃㩷㪍㪈㪃㩷㪈㪍㪈㪄㪈㪎㪇㪅㩷