歴史地震
第35号(2020) 113-120頁
受付日 2019/10/15, 受理日 2020/03/31

1841ᖺ㻌1᭶㻌19᪥䛾㝣๓䛾ᆅ㟈䠉㏆ୡ䛾䜔䜔῝䛔Ẽ௝ᆅ᪉䛾⿕ᐖᆅ㟈䠉බ┈㈈ᅋἲேᆅ㟈ண▱⥲ྜ◊✲᣺⯆఍ ᆅ㟈ㄪᰝ◊✲䝉䞁䝍䞊* ᯇᾆ ᚊᏊᮾ໭኱Ꮫ⅏ᐖ⛉Ꮫᅜ㝿◊✲ᡤ㻌†బ⸨ ኱௓The earthquake under Kesen region, Tohoku, Japan on Jan. 19, 1841
A Detructive Intraplate event in the early modernRitsuko S. MATSU’URA
Earthquake Research Center, ADEP, Chiyoda Build. 8F 1-5-18, Sarugaku-cho, Chiyoda-ku,Tokyo, 101-0064 Japan
Daisuke SATO
International Research Institute of Disaster Science, Tohoku Univ., Aoba, 468-1, Aramaki, Aoba-ku,Sendai, Miyagi, 980-0845, Japan
In the morning on Jan. 19, 1841, a remarkable earthquake occurred near the Kesen region, and it was felt in wide
area in the northeastern Japan. Whether it is a destructive earthquake or not had not been determined. The historical
documents on this event, especially diaries written in Sendai clan territory, were reexamined thoroughly. We
concluded that it was the PAC intraplate earthquake of about M6.5 at about 70km-depth under Kesen region, andsome breakage was caused at least in Wakuya town by this earthquake. The winter of 1840-1841 was severe, andthe surface of Kitakami River was fully frozen before this event. The river ice was broken due to the shaking of thisevent. There was a rumor that some were dead in the water transport system of Kitakami River at Oshu city due tothat ice breakage. However, the similar rumor on Tome city was denied later. This event should be added as #2411 destructive earthquake of D1 level with the epicenter of (39.0°±0.2°N, 141.7°±0.2°E) to “List of destructive
earthquakes in Japan, 599-2012”, although the human damage remained uncertain.
Key words: 1841 Jan. 19 Rikuzen destructive earthquake, intermediate depth, PAC intraplate§1. 䛿䛨䜑䛻1841 ᖺ 1 ᭶ 19 ᪥䠄ኳಖ༑୍ᖺ༑஧᭶஧༑୐᪥䠅༗๓ 10 ᫬㡭䠄ᕭ䛾้䠈ᡈ䛔䛿ᮅ䛾ᅄ䝒᫬䛿䛣䛾᪥௜䛷䛿ᐃ᫬ἲ䛷䜒୙ᐃ᫬ἲ䛷䜒ᮾ໭ᆅ᪉䛷䛿༗๓ 10᫬㡭䛸䛺䜛䠊䠅䠈ᐑᇛ┴䜔ᒾᡭ┴䜢୰ᚰ䛻㛵ᮾᆅ᪉䜎䛷 ᮾ ᪥ ᮏ䛷 ᗈ ⠊ᅖ 䛻᭷ឤ 䛾 ᆅ㟈䛜 䛒 䛳䛯 䠊 Ώ ㎶
䠄1991䠅䛿䛂ᐑᇛ┴Ἀ䛾㔠⳹ᒣἈ䝍䜲䝥䛃䛸䛧䛶つᶍ䛾๭䛻⿕ᐖ䛜ᑠ䛥䛔䝥䝺䞊䝖㛫ᆅ㟈䛷䛒䜛䛸䛧䛯䛜䠈㟈※఩⨨䛿♧䛧䛶䛔䛺䛔䠊Ᏹబ⨾䠄1996䠅䛿↓⿕ᐖᆅ㟈䛸ุ᩿䛧䛶䠈ᮍ䛰䛻᪥ᮏ⿕ᐖᆅ㟈⥲ぴ[Ᏹబ⨾䜋䛛䠄2013䠅]䛻䛿ᥖ㍕䛥䜜䛶䛔䛺䛔䠊Ᏹὠ䠄1999䠅䛿㈇യ 4 ྡ䛾 D2 䝺䝧䝹 [⿕ᐖ䝺䝧䝹䛿Ᏹὠ䠄1999䠅* 䛈101-0064 ᮾி㒔༓௦⏣༊⚄⏣⊷ᴦ⏫ 1-5-18p.802 䛻ゎㄝ䛜䛒䜛䠊] 䛾⿕ᐖᆅ㟈䛸䛧䛶䛔䜛䛜䠈㟈※఩⨨䛿Ỵ䜑䛶䛔䛺䛔䠊䜎䛯Ᏹὠ䠄1999䠅䛾㈇യ⪅ᩘ䛾᰿ᣐྐᩱ䛜⌧ᅾぢᙜ䛯䜙䛺䛔䠊Ώ㎶䛜䛂㔠⳹ᒣἈ䝍䜲䝥䛃䛸䛧䛶䛣䛾 1841 ᖺ䛾ᆅ㟈䛿 1936 ᖺᐑᇛ┴Ἀᆅ㟈䛸ྠ✀䛾䝥䝺䞊䝖㛫ᆅ㟈䛸䛧䛶䛔䜛䛜䠈ᮏᙜ䛷䛒䜝䛖䛛䠊䛣䛾ᆅ㟈䛿⿕ᐖ䛾᭷↓䜢ྵ䜑䛶䠈᳨ウ䛜ᚲせ䛺Ṕྐᆅ㟈䛾୍䛴䛷䛒䜛䠊௝ྎ䜔ᪧ໭ୖᕝἙཱྀὶᇦ䛻ᙉ䛔ᦂ䜜䛜⏕䛨䛯ᆅ㟈䛿䠈ఱ䛷䜒䛂ᐑᇛ┴Ἀᆅ㟈䛃䛸䛥䜜䜛ഴྥ䛜䛒䜛[e.g.
Ώ㎶䠄1993䠅]䠊౛䛘䜀ᆅ㟈ㄪᰝ◊✲᥎㐍ᮏ㒊䠄2000䠅
䛿 M7.5 ௨ୗ䛻䜒㛵䜟䜙䛪ᐑᇛ┴Ἀᆅ㟈䜢 40 ᖺ㊊䜙䛪䛷⧞䜚㏉䛩䝥䝺䞊䝖㛫ᆅ㟈䛾ᅛ᭷ᆅ㟈඾ᆺ౛䛸䛧䛶㛗ᮇホ౯䜢⾜䛳䛯䠊1835䠈1861䠈1897䠈1936 ᖺ䛾 4༓௦⏣䝡䝹 8F

㟁Ꮚ䝯䞊䝹: matsuura adep.or.jp† 䛈980-0845 ௝ྎᕷ㟷ⴥ༊ⲨᕳᏐ㟷ⴥ 468-1- 113 -ᆅ㟈䛜඲䛶 1978 ᖺ䛸ྠ㟈※ᇦ䛾ᐑᇛ┴Ἀᆅ㟈䛸䛧䛯䠊䛧䛛䛧䠈䛣䛾୰䛾 1861 ᖺᩥஂᐑᇛ䛾ᆅ㟈䛿Ἀྜ䛾䝥䝺䞊䝖㛫ᆅ㟈䛷䛿䛺䛔 [e.g. Ᏹబ⨾䜋䛛䠄2013䠅
p.688]䠊1900䠈1962䠈2003 ᖺ䛸㟈※ᇦ䛜᪫ᒣᧉ᭤ἢ䛔䛻༡໭䛻୪䜃䠈㏕ᕝୗὶ㒊䛛䜙ᪧ໭ୖᕝ䛾᭱ୗὶ㒊ἢ䛔䛾Ⓩ⡿ᕷ䞉㐲⏣㒆䞉ᮾᯇᓥᕷ䠈▼ᕳᕷ䛾పᆅ㒊䠈኱ᓮᕷ䛸ᰩཎᕷ䛾ᮾ➃䛺䛹䛻⿕ᐖ䜢䜒䛯䜙䛩
M6.5 ⛬ᗘ䛾ᐑᇛ┴໭㒊ᆅ㟈䛸࿧䜀䜜䜛㝣䛾ὸ䛔ᆅ㟈䛾୍䛴䛷䛒䜛䠊໭ୖᕝୗὶ㒊䜢⿕ᐖᆅ䛸䛩䜛ᆅ㟈䛾㟈※ᇦ䛾ุ᩿䛻䛿ὀព䛜ᚲせ䛷䛒䜛䠊⾲ 1䠊1841 ᖺ 1 ᭶ 19 ᪥䛾ᆅ㟈䛻㛵䛩䜛ྐᩱ୍ぴTable 1. Historical documents which recorded the morning event on 1841 Jan. 19.
Place
IntensityRemarks໭ᾏ㐨ཌᓊ㒆ཌᓊ⏫
኱ᆅ㟈㟷᳃┴䜐䛴ᕷ⏣ྡ㒊ᙉᆅ㟈㟷᳃┴ᘯ๓ᕷᙉᆅ㟈 ༶้Ṇ㟷᳃┴ඵᡞᕷ᭷ឤᒾᡭ┴ᐑྂᕷ⏣௦ᙉᆅ㟈⛅⏣┴⛅⏣ᕷ༓⛅බᅬ᭷ឤᒾᡭ┴┒ᒸᕷᙉᆅ㟈ᒾᡭ┴ᒾᡭ㒆㞸▼⏫
኱ᆅ㟈ᒾᡭ┴ᐑྂᕷ㛗ἑ኱ᆅ㟈ᒾᡭ┴⣸Ἴ㒆⣸Ἴ⏫
኱ᆅ㟈ᒾᡭ┴ⰼᕳᕷᮾ࿴⏫䛾ᾋ⏣኱ᆅ㟈 ㏆ᖺ䛻↓ぬ⛬ᒾᡭ┴ዟᕞᕷỤ่༊䛾ୗᕝཎ 4௨ୖᒾᡭ┴㝣๓㧗⏣ᕷ௒Ἠ኱ᆅ㟈 ㏆ᖺ↓அ஦ஂຓぬ∭䛾෗䛧䛸ุ᩿ ኱ᆅ㟈ᒾᡭ┴୍㛵ᕷ⸨ἑ⏫
኱ᆅ㟈ᒣᙧ┴᭱ୖ㒆኱ⶶᮧ᭷ឤᒣᙧ┴໭ᮧᒣ㒆኱▼⏣⏫
᭷ឤ4௨ୖᐑᇛ┴㐲⏣㒆ᾛ㇂⏫ᾛ㇂᪂₲┴᪂₲ᕷୖᡤ᭷ឤ⚟ᓥ┴㒆ᒣᕷ⏣ᮧ⏫
ᙉᆅ㟈⚟ᓥ┴ⓑἙᕷ᭷ឤᇸ⋢┴ᆏᡞᕷ㉥ᑿ᭷ឤ༓ⴥ┴༳すᕷ㓇┤኱ᆅ㟈༓ⴥ┴᪫ᕷ᭷ឤᮾி㒔Ṋⶶᮧᒣᕷ୰ኸ᭷ឤ༓ⴥ┴㖯Ꮚᕷ᭷ឤᮾி㒔༓௦⏣༊୍䝒ᶫ᭷ឤᮾி㒔༓௦⏣༊஑ẁᆏୗ᭷ឤᮾி㒔༓௦⏣༊஑ẁᆏୖᙉᆅ㟈ᮾி㒔ቚ⏣༊ᙉᆅ㟈ᮾி㒔༓௦⏣༊ⓚᒃእⱌᙉᆅ㟈 వ⛬அ㟈Ẽ༓ⴥ┴⩦ᚿ㔝ᕷ㮛἟᭷ឤ༓ⴥ┴ⱱཎᕷᑠ㎙᭷ឤHistorical MaterialsᅜὈᑎ᪥㚷グ㞧᭩ὠ㍍⸬ᚚ᪥グ㐲ᒣᐙ᪥グᾋୡ⪃䛜䛔グ኱㉺ᅞಙ᪥グ༡㒊ᐙㅖ᭩ᢤ㞸▼ṓ௦᪥グ㛗ἑᮧ⅏␗グᆅ㟈⅏ᐖᖺ௦⾲䠄ᢒ䠅
኱ᅗ᪥グ
኱ᅗ᪥グ
ゅᒇᩜஂຓぬ∭ୡ஀୰㢼ၐ⪺᭩୸ྜྷⓙᕝᐙ᪥ㄅ
ኳಖᖺ୰ᕫⲨᏊᏞఏ
ோ⸨㒊୓᪥グⰼ஭᪥グ㟷ᮌẶ᪥グ
Ᏺᒣ⸬ᚚ⏝␃ᖒᕝ℩ᐙ᪥グ
ᯘᐙ᪥グ
Ⲩ஭ᐙ᪥グ
୓ぬᖒ
ᣦ⏣ᐙ᪥グ䚷ୖᕳ⋞ⶽ᪥グ
ᴬཎ⸬᪥グ
஭㛵㝯Ꮚ᪥グ㟋᠇ೃ⡙ὠ㍍⸬Ụᡞ⸬㑰ᚚ᪥グᯇᖹᐜᩗ᪥グ
Ώ㎶ᐙ᪥グ
⸨஌ᐙ᪥グ

Vol. & pageS4p.771
S4p.771
S4p.771
S4p.771
H2p.646
U1p.276
H2p.646
S4p.771
H1p.873
S4p.771
U5p.430
U5p.430
W
H1p.873⩻้୰M3p.427
S4p.771
H2p.646
U1p.276
H1p.873
H1p.873
H1p.873
H1p.873
H1p.873
U5p.430
S4p.771
S4p.771
H2p.646
M3p.427
S4p.771
H1p.873
S4p.771
US1p.1003

Iexp
1.4
2.7
2.4
3.3
4.1
2.6
3.7
3.5
3.7
4.0
3.8
4.6
4.6

ǻ,M65
0.37
-0.29
0.09
-0.18
0.09
0.200.13
0.31
0.86
0.41
0.29
-0.23
0.35

4.6
3.1
3.2
4.6
2.3
2.6
2.4
2.1
2.5
2.4
1.6
2.5
2.3
2.3
2.0
2.4
2.4
2.1
2.2

0.25
0.20
0.35
-0.37
-0.59
0.43
0.42
-0.32
-0.42
-0.05
0.18
-0.13
-0.48
-0.47
-0.11
-0.61
-0.61
-0.13
-0.13

Vol.&pages 䛿ห⾜ᆅ㟈ྐᩱ㞟ྡ䛸ヱᙜ㡫䠊M3䠖ቑゞ 3 [ᩥ㒊┬䠄1943䠅]䠈 S4, H1, H2䠖᪂཰ 4䠈⿵㑇䠈⥆⿵㑇[ᮾி኱Ꮫᆅ㟈◊✲ᡤ䠄1984, 1989, 1993䠅]䠈U1, US1, U5䠖ᣠ㑇䠈ᣠ㑇ูᕳ䠈ᣠ㑇 5 [Ᏹబ⨾䠄1998, 1999, 2012䠅]䠈
W䠖 [Ώ㎶ (1994䠅]. Iexp 䛸䂴IM65 䛿䛭䜜䛮䜜 Mw6.5 䛾ሙྜᘧ(1)䛷ண 䛥䜜䜛㟈ᗘ䛸䠈䛭䛾㟈ᗘ䜢ᆅ┙᮲௳
AVS30=300m/s ┦ᙜ䛻ㄪᩚ䛩䜛䛯䜑䛻ᚲせ䛺⿵ṇ್䠊The right three columns show; archives of historical documents, expected intensity for Mw6.5 by Eq. 1, and its
correction for Vs30=300m/s for each site, respectively. The following symbols indicate these published archives ofhistorical documents of earthquakes. S4, H1, H2: Univ. Tokyo (1984, 1989, 1993), U1, US1, U5: Usami (1998,1999, 2012), M3: Ministry of Education (1943), W: Watanabe (1994).

- 114 -䛯䜎䛯䜎ྂẼೃ䛾◊✲㞟఍䛷ᯇᾆ䛜▱ᕫ䜢ᚓ䛯బ⸨䛜䠈㏆ୡ䛾ఀ㐩⸬㡿ෆ䛾᪥グྐᩱ䛜ᑓ㛛䛷䛒䛳䛯䛾䛷䠈༠ຊ䛧䛶᪤หྐᩱ㞟䛻཰㘓䛥䜜䛯᪥グ㢮䛾ཎ඾䜔ಙ㢗䛷䛝䜛⩻้䛻䛒䛯䛳䛯䠊䛥䜙䛻䛣䜜䜒䛯䜎䛯䜎䛷䛒䜛䛜䠈బ⸨䜙䛜⩻้୰䛾᪥グ୰䛷䠈䛣䛾ᆅ㟈䛻㛵䛩䜛შヰ䛷䠈ᚋ᪥᢯ᾘ䛥䜜䛯グ㏙ෆᐜ䛜ぢ䛴䛛䛳䛯䠄㝃㘓 1 ཧ↷䠅䠊䜎䛯䠈⩻้ᚋ䛾ព࿡䛜䛣䜜䜎䛷୙᫂░䛷䛒䛳䛯ྐᩱ䛻㛵䛧䛶䠈ᙜヱᆅᇦ䛾㒓ᅵྐᐙ䜙䛾༠ຊ䜒ᚓ䜙䜜䛯䠊୍㒊䜎䛰ゎㄞ䛜᏶஢䛧䛺䛔ᝏ➹㒊ศ䛜ṧ䜛䜒䛾䛾䠈Ẹ಑Ꮫⓗ䛺☜ㄆ䛻䜘䛳䛶䠈ᩥព䛻䜋䜌⣡ᚓ䛾䛔䛟ゎ㔘䛻㐩䛧䛯䠊䜎䛰⿕ᐖ⛬ᗘ䛾ヲ⣽䛻㛵䛩䜛୙☜ᐇᛶ䛿ṧ䜛䛜䠈⌧᫬Ⅼ䛷฼⏝ྍ⬟䛺䛣䛾ᆅ㟈䛻㛵䛩䜛᝟ሗ䛾ሗ࿌䜢⾜䛔䠈䛥䜙䛺䜛ከ᪉㠃䜔␗ศ㔝䜒ྵ䜑䛯᝟ሗ䜢ᚓ䛯䛔䠊ᅗ 1䠊1841 ᖺ 1 ᭶ 19 ᪥䛾ᆅ㟈䛾㟈ᗘศᕸᅗ
Fig. 1. The intensity distribution of Jan. 19, 1841 event.

§2. ྐᩱ᳨ウ䛸⪃ᐹ䜎䛪⿕ᐖグ㏙䜢᳨ウ䛩䜛䠊ḟ䛻యឤ㟈ᗘ䜔ᦂ䜜᪉䛾≉ᚩ䜢᳨ウ䛧䛶䠈㟈ኸ䜔㟈※䝍䜲䝥䜢ồ䜑䠈᭱ᚋ䛻ᆅ㟈つᶍ䜢ྫྷ࿡䛩䜛䠊
2.1 ⿕ᐖグ㏙䛾᳨ウ⿕ᐖ᝟ሗ䛾䛒䜛ྐᩱ䛿 2 Ⅼ䛒䜛䠊1 䛴䛿ᒾᇛẶ䠄⌧ዟᕞᕷỤ่ᒾ㇂ᇽ䜢ᨭ㓄䠅䛾⯪ሙ䠄⌧ྠỤ่ឡ᏾䛾ୗᕝཎ䠅䛻㛵䛧䛶䠈20km ⛬㞳䜜䛯ྠ┴䛾ᮾ࿴⏫ᾋ⏣䛷䛾ఏ⪺᝟ሗ䛷䛒䜛䠊ᮾ໭㏆ୡྐ䛾Ὀᩯ᳃჆ර⾨Ặ┘ಟ䛾Ụ่ᕷྐ䛻䛿䠈⦅⧩䛾䛯䜑䛻ู䛾⏫䛾ྐ ᩱ ཰ 㞟䜎䛷 䛥䜜䛶 䛔䜛 [Ụ ่ ᕷ ྐ⦅ ⧩ ጤဨ ఍
䠄1976䠅]䠊ᾋ⏣䛷䛿䠈䛂㏆ᖺ䛻ぬ䛘䛜↓䛔⛬䛃䛾኱ᆅ㟈䜢ឤ䛨䛯䠊䛥䜙䛻䠈䛂䛒䛾ᆅ㟈䛷ᒾᇛẶ䛾⯪╔䛝ሙ䛷䛿෾⤖䛧䛶䛔䛯ᕝ䛾ị䛜๭䜜䛶ື䛔䛯䠊⯚䛾ே䛜ᦂ䜜䛷 2-3 ேṚ䜣䛰䠊䛃䛸㞄⸬Ụ่䛾஦௳䜒グ㘓䛧䛶䛔䜛䠊ཎᩥ䛷Ụ่䛻㛵䜟䜛㒊ศ䛿䛂ᕝࠎࡋࡀΏࡾ⮴ࡋೃฎࡶⓙࡋࡀࡣ࡞ࢀᒾᇛ⯚ሙᢝ࡚ࡣᕝ୰࡟࡚ᆅ㟈࡟ࡺࡽࢀேᘨ୕ேṚೃ⏤ᢎೃ䛃䛸䛒䜛䠊䛂䛧䛜䛃䛿ị䛾᪉ゝ䠈䛂ᒾᇛ⯚ሙ䛺䛹䛃䛿䠈ኳಖᙜ᫬ᒾ㇂ᇽせᐖ䛾㈐௵⪅䛰䛳䛯ᒾᇛẶ䛾໭ୖᕝỈ㐠ᇶᆅ䜢ᣦ䛩䠊䛣䛾ྐᩱ䛜᭩䛛䜜䛯⌧ⰼᕳᕷᮾ࿴⏫䛾ᾋ⏣䛿䠈ᙜ᫬༡㒊⸬㡿䛷䠈ఀ㐩⸬䛾Ụ่ᆅ༊䛸䛾⸬ቃ㆙ഛ䛾⾤㐨➽䛾ᮧ䛰䛳䛯䠊໭ୖᕝ䛛䜙䛿ᮾ䛻 8km ௨ୖ㞳䜜䛯ᒣ୰䛷䛒䜛䛾䛷䠈ᕝ㠃䛜෾⤖䛧䛯䛣䛸䜢ྵ䜑䛶ఏ⪺䛷䛒䜝䛖䠊䛣䛾ྐᩱ䛻ᇶ䛵䛝Ụ่ᕷྐ䛷䛿䛣䛾ᆅ㟈䛿⦅⧩ᙜ᫬Ụ่ᕷෆ䠄⌧ዟᕞᕷ䠅䛾໭ୖᕝΏ䛧ሙ䛷⿕ᐖ䛜䛒䛳䛯ᆅ㟈䛸ุ᩿䛧䛶䛔䜛䠷Ụ่ᕷྐ⦅⧩ጤဨ఍䠄1985䠅䠹䠊䛯䛰䛧ᒾ㇂ᇽᆅᇦ䛷䛾ᙜヱ஦ᨾ䛾ྐᩱ䛿ぢ䛴䛛䛳䛶䛔䛺䛔䠊䛭䛣䛷㟈ᗘ 4 ௨ୖ䛸ุᐃ䛧䛯䠊䜒䛖 1 Ⅼ䛾ྐᩱ䛿ྂẼೃ◊✲䛻฼⏝䛥䜜᪤䛻᭷ྡ䛷ห⾜ᮏ䜒䛒䜛ᐑᇛ┴㐲⏣㒆ᾛ㇂⏫䛾䛄ⰼ஭᪥グ䛅䛷䛒䜛䠊Ώ㎶䠄1991䠅䛻䛿ヱᙜ㒊ศ䛾ห⾜ᮏ䛸䛿␗䛺䜛⩻้ᩥ䜒ᥖ㍕䛥䜜䛶䛔䜛䠊ඖ䚻䛾ྐᩱ䛜┦ᙜ㞴ㄞ䛺ୖ䛻䠈⩻้ᩥ䛾ព࿡䛜ุ↛䛸䛧䛺䛔䛾䛷䠈௒ᅇᡤⶶ⪅䛾༠ຊ䜢ᚓ䛶䠈ཎᮏ䜢㩭᫂䛻᧜ᙳ䛧䠈㟷ⴥᒣྂᩥ᭩఍䛷䜒᳨ウ䛧䛶㡬䛔䛯䠊䛭䛾⤖ᯝ䛂ᡤࠎ኱◚┦ᡂೃ ᡭ๓ࢽ࡚ྂ኱ᡤ࠿࠸ࡾ⏦ ඼እ኱◚┦ฟೃ ᕝ୍㠃ࡣࡾࡉ࡬ࡲ ᑡࢩࢶ࣯ᅾஅ䛃䛸䛺䛳䛯䠊ᮾி኱Ꮫᆅ㟈◊✲ᡤ䠄1993䠅䛸␗䛺䜛䛾䛿䛂ฟ䛃୍ᩥᏐ䛷䛒䜛䠊ణ䛧ᩳయ䛷♧䛧䛯䛂䜎䛃䛾Ꮠ䛿䠈ᚋ᪥ⰼ஭᪥グ䛾௚䛾㒊ศ䜢䛩䜉䛶ุㄞ䛩䜜䜀䠈ሙྜ䛻䜘䛳䛶䛿␗䛺䜛Ꮠ䛻ኚ᭦䛩䜛ྍ⬟ᛶ䛜䛒䜛㉸㞴ㄞ⟠ᡤ䛷䠈ᬻᐃⓗ䛻䛂䜎䛃䛸䛧䛶䛚䛟䠊⌧᫬Ⅼ䛷䛾䛣䛾ᩥ❶䛾ゎ㔘䛿

- 115 -䛂᪉䚻䛷◚ᦆ⿕ᐖ䛜䛒䛳䛯䠊ⰼ஭ᐙ䛷䛿ྂ䛟䛺䛳䛯ྎᡤ䛷◚ᦆ䛜䛒䛳䛯䠊ᕝ䛻䛿ཌ䛔ị䛜ᙇ䛳䛶䛔䛶䠈䛭䜜䛜๭䜜䜛䛺䛹ఱ䜙䛛ኚ໬䛜䛒䛳䛯䠊䛃䛸䛩䜛䠊䛂䛥䜈䛃䛿ᾛ㇂䜢ὶ䜜䜛໭ୖᕝᨭὶỤྜᕝ䜢ὶ䜜䜛ị䜢ᣦ䛩ᾛ㇂䛾ゝⴥ䛷䛒䜛䠊䛂䛦䛔䛃䜎䛯䛿䛂䛦䛘䛃䛸ṇᘧ䛺Ⓨ㡢䛿⃮䜚䠈ᕝ䜢ὶ䜜䜛ị䜢ᣦ䛩[ᾛ㇂⏫ᩥ໬㈈཭䛾఍䠄2002䠅]䠊-ႏ௨ୗ䛻䛺䜛䛸䛦䛔䛜ὶ䜜ጞ䜑䜛䛸ゝ䛖䠊䛂䛿䜚䛥䜈䛃䛿ᕝ㠃䛻ཌ䛔ị䛜ᙇ䛳䛯≧ែ䜢ᣦ䛩䠊Ụྜᕝ䛿ᆅ㟈᫬䛻䛿୍㠃෾⤖䛧䛶䛔䛯䛜䠈ᆅ㟈䛾ᦂ䜜䛷๭䜜ື䛟䛺䛹ኚ໬䛧䛯䛣䛸䛿☜ᐇ䛷䛒䜛䠊䛂䛿䜚䛥䜈䛃䛜䛂ᑡ䛧䛵䛴䛣䜜䛒䜛䛃๭䜜ị䛻䛺䛳䛯䠈䛸ゎ㔘䛩䜛䠊ඖ䚻ኳೃ䜢Ḟ䛛䛥䛪᪥グ䛻᭩䛔䛯ⰼ஭᪥グ䛾ⴭ⪅䛿䠈⮬Ꮿ䛛䜙 1km 䜒㞳䜜䛶䛔䛺䛔Ụྜᕝ䛾෾⤖≧ἣ䛺䛹䛻䜒㛵ᚰ䛜㧗䛟䠈ᆅ㟈䛷๭䜜䛯ị䜒⌋䛧䛛䛳䛯䛣䛸䛰䜝䛖䠊ྎᡤ䛿㏻ᖖᅵ㛫䛷䛒䜛䛛䜙䠈䛂䛛䛔䜚⏦䛃䛧䛯䛾䛿ᘓ≀䛸䛿⪃䛘㞴䛔䠊ྂ䛔ྎᡤ䛾◚ᦆ䛿㏻ᖖᐙ
ᒇ䛾◚ᦆ䠄⿕ᐖ䝺䝧䝹 D2 ┦ᙜ䠅䜘䜚䛿㍍䛔䠊ჾ㈈䛾
◚ᦆ䛷⿕ᐖ䝺䝧䝹 D1 䛜☜ᐇ䛺⠊ᅖ䛷䛒䜛䠊㟈ᗘ䜒 4௨ୖ䛸ᖜ䛾䛒䜛ุᐃ䛸䛧䛯䠊ⰼ஭ᐙ䛾ಟ᚟グ㏙䛺䛹䛜䛒䜜䜀㟈ᗘุᐃ䛿ᑗ᮶⤠䜚䛣䜑䜛ྍ⬟ᛶ䜒䛒䜛䠊
2.2 㟈ᗘศᕸ
⾲ 1 䛸ᅗ 1 䛻䛣䛾ᆅ㟈䛻㛵䛧䛶᭷ឤ௨ୖ䛷䛒䛳䛯ሙᡤ䛸ุᐃ䛥䜜䛯㟈ᗘ䛸䜢䜎䛸䜑䛯䠊㟈ᗘุᐃ䛿୰ᮧ䞉ᯇᾆ䠄2011䠅䛾௜⾲ 1.1-1.2 䛻ᚑ䛳䛯䠊ᑦ䠈䛂኱ᆅ㟈䛃䛂ᙉᆅ㟈䛃䛺䛹䛾୺ほⓗグ㏙䛿Ᏻ᫆䛻㟈ᗘᩘ್䛻⨨䛝᥮䛘䛪䛻ྲྀ䜚ᢅ䛳䛯䠊ᙧᐜモⓗ㟈ື⛬ᗘ䛿䠈ே䛻䜘䛳䛶ᑻᗘ䛜␗䛺䜛䠊ྠ䛨ே䛷䜒᫬ᮇ䛻䜘䜚ᑻᗘ䛜ኚ䜟䜚䛖䜛䠊䜎䛯䠈⌧௦䜘䜚䜒ேᕤ᣺ື䝜䜲䝈䛜㏻ᖖ
ᑠ䛥䛔㏆ୡ䛷䠈ྐᩱ䛜㇏ᐩ䛻䛺䜛ᖥᮎᮇ䛻䛿䠈᭷ឤ᝟ሗ䛜᭷ឤ㝈⏺䛾㟈ᗘ 1 䛷䛒䜛ሙྜ䜒䛒䜜䜀䠈❧䛱Ṍ䛔䛶䛔䛶䜒ุ䜛㟈ᗘ 3 ┦ᙜ䛷䛒䜛ሙྜ䜒䛒䜚䠈Ᏻ᫆䛻୍ᚊ䛾ᩘ್䛻ᙜ䛶䛿䜑䛶䛿䛺䜙䛺䛔䠊 2 ᆅⅬ䛰䛡䛿ヲ⣽䛿᫂░䛷䛿䛺䛔䜒䛾䛾◚ᦆ⿕ᐖ䛾᝟ሗ䛜䛒䜚䠈๓⠇䛻䜘䛳䛶ඹ䛻㟈ᗘ 4 ௨ୖ䛸䛧䛯䠄ᅗ 1䠅䠊䛣䛾 2 ᆅⅬ䛿㞄᥋䛩䜛ヂ䛷䛿↓䛟䠈໭ୖᕝἢ䛔䛷䛿䛒䜛䛜㞳䜜䛶䛔䜛䠊ྐᩱ䛾ゎ㔘䛻䛛䛛䜟䜙䛪䠈䛹䛱䜙䜒㟈ᗘ 6ᮍ‶䛷䛒䜛䛣䛸䜒᫂ⓑ䛷䛒䜛䠊䛣䜜䜙 2 ᆅⅬ䛾㟈ᗘุᐃ䛜㟈ᗘ 4.5䡚5.5 䛻ኚ໬䛧䛶䜒䠈௨ୗ䛻㏙䜉䜛㟈ᗘศᕸ඲య䛾≉ᚩ䜢ኚ䛘䜛䜒䛾䛷䛿䛺䛔䠊䛣䛾ᆅ㟈䛾᭷ឤᇦ䛿໭ᾏ㐨ᮾ㒊ཌᓊ䛛䜙༓ⴥ┴ⱱཎ䜎䛷ᗈ䛜䛳䛶䛔䜛䠊ᐑᇛ┴䛸ᒾᡭ┴䛸䛾ἢᓊ㒊䛾┴ቃ௜㏆䛜᭷ឤᇦ䛾୰ᚰ㒊ศ䛻䛺䜛䛜䠈≉ẁ኱㟈ᗘ䛾㞟୰䛿ぢ䜙䜜䛺䛔䠊䜐䛧䜝ᗈ⠊ᅖ䛷኱䛝䛔ᦂ䜜䜢⾲䛩䛂኱ᆅ㟈䛃䜔䛂ᙉᆅ㟈䛃䛜ᩓぢ䛥䜜䠈Ụᡞ䛷䜒㢧ⴭ䛺యឤ䛸䛺䛳䛶䛔䜛䠊䛥䜙䛻ⰼᕳᕷᮾ࿴⏫䜔㝣๓㧗⏣ᕷ䛷䛿༑ᩘᖺ㛫䛷୍␒኱䛝䛺ᦂ䜜䛰䛳䛯᪨䛾グ㏙䛜䛒䜚䠄⾲ 1䠅䠈⿕ᐖ䛿↓䛔䛜యឤ䛷ᛧ䛔䛸ឤ䛨䜙䜜䜛⠊ᅖ䛜ᗈ䛔≉ᚩ䛜䛒䜛䠊䛣䜜䛿䠈῝䛥䛜䜔䜔῝䛟ᛂຊ㝆ୗ㔞䛜኱䛝䛔ኴᖹὒ䝥䝺䞊䝖䠄௨ୗ PAC 䛸␎グ䠅ෆᆅ㟈[e.g. Fujii and Matsu’ura䠄2000䠅]䛾≉ᚩ䛸ྜ⮴䛩䜛䠊▷࿘ᮇ䛾ᦂ䜜䛜䠈໭ୖ㧗ᆅ༡㒊䜢୰ᚰ䛻༟㉺䛧䛶䛔䛯䛸ุ᩿䛥䜜䜛䠊ィ 㟈ᗘ䛾䝕䞊䝍䝧䞊䝇[e.g. ᆅ㟈ண▱⥲ྜ◊✲᣺⯆఍䠄1997䠅]䛻䛒䜛᭱㏆ 20 ᖺ㛫䛾✀䚻䛾ᆅ㟈䛻䜘䜛ከᩘ䛾ィ 㟈ᗘศᕸᅗ䛛䜙䠈ୖグ䛾≉ᚩ䜢ᣢ䛴䜒䛾䜢᥈䛩䛸䠈2003 ᖺ 5 ᭶ 26 ᪥῝䛥 72km M7.1䠄F-net
䛾 Mw 䛿 7.0䠈᭱኱㟈ᗘ 6 ᙉ䠅䜔 2014 ᖺ 4 ᭶ 3 ᪥῝䛥 64km M5.5䠄᭱኱㟈ᗘ 4䠅䛺䛹Ẽ௝ᆅ᪉┤ୗ䛷Ⓨ⏕䛩䜛䜔䜔῝䛔 PAC ෆᆅ㟈䛸㢮ఝ䛧䛶䛔䜛䠊ᑦ䠈䛣䜜䜙ཧ↷ᆅ㟈䛾㟈ᗘศᕸᅗ䛿㝃㘓 2 䛾 URL 䛷䜹䝷䞊⾲♧䛜㜀ぴ䛷䛝䜛䠊ᛕ䛾䛯䜑᭱኱ィ 㟈ᗘ䛜ᾛ㇂⏫䛸ᪧỤ่ᕷ䛸୧᪉䛷 4 ௨ୖ䛻䛺䛳䛯 PAC ෆᆅ㟈䜢㑅䜃ฟ䛩䛸䠈๓㏙
䛾 2003 ᖺ䛸 2014 ᖺ䛾 2 ಶ௨እ䛻䛿 2011 ᖺ 4 ᭶ 7
᪥ M7.2 䛰䛡䛷䛒䜛䠊䛣䜜䛿㟈ኸ䛜䜔䜔༡䛷௝ྎᖹ㔝䛾㟈ᗘ䛜䜘䜚኱䛝䛟䛺䜛䠊1841 ᖺ䛿௝ྎᖹ㔝䛾⿕ᐖグ㘓ྐᩱ䛿Ⓨぢ䛥䜜䛶䛔䛺䛔䛾䛷 2011 ᖺ䛸䛿Ỵᐃⓗ䛻␗䛺䜛䛸ุ᩿䛩䜛䠊䛭䛣䛷 1841 ᖺ䛾ᆅ㟈䛾㟈ኸ䛿 2003 ᖺ䛸 2014 ᖺ୧⪅䛾୰㛫䜢䛸䛳䛶䠈໭⦋
39.0°±0.2° ᮾ⤒ 141.7°±0.2°䛸ᅗ 1 䛻Ⅼ⥺䛷♧䛧䛯⠊ᅖෆ䠈῝䛥䛿 70km±6km 䛸䛧䛯䠊
2.3 ᆅ㟈䛻䜘䜛ᕝ㠃䛾ị䛾๭䜜
2.1 ⠇䛾㏻䜚䛣䛾ᆅ㟈䛿䛄ⰼ஭᪥グ䛅䛾ఏ⪺䛷䛿䛺䛔᝟ሗ䛷䠈ᑡ䛺䛟䛸䜒ᾛ㇂࿘㎶䛷◚ᦆ⿕ᐖ䛜䛒䛳䛯⿕ᐖᆅ㟈䛸䛧䛶䜘䛔䛣䛸䛜ุ䜛䠊䛥䜙䛻ᾋ⏣䠈㝣๓㧗⏣䛾ྐᩱ䛛䜙䜒䠈໭ୖᕝ䜔䛭䛾ᨭὶ䛷ᆅ㟈๓䛻౛ᖺ䜘䜚ཝ෤䛾䛯䜑ᕝ㠃䛾୍㠃෾⤖䛜」ᩘ⟠ᡤ䛷ฟ⌧䛧䛶䛔䛯䛣䛸䛜ุ䜛䠊䜎䛯ᕝ䛾ị䛜ᆅ㟈ື䛷๭䜜䛶ື䛔䛯䛣䛸䜒ᾛ㇂䛸Ụ่䛸䛷ඹ㏻䛧䛶䛔䜛䠊෤Ꮨ䛾ᆅ㟈䛾ị䛻䜘䜛⿕ᐖ䛿䠈1952 ᖺ༑຾Ἀᆅ㟈䛾㝿䛻ཌᓊ‴䛺䛹䛷ὠἼ䛻䜘䛳䛶๭䜜䛯ᾏị䛜㐳ୖ䛧䛯䛯䜑䠈ᾏ⸴ධ䜚ị䛻⾪✺䛥䜜ᐙᒇ⿕ᐖ䛜⏕䛨䛯౛ [໭ᾏ㐨䠄1953䠅] 䛜䛒䜛䠊ᆅ㟈᫬䛾ᕝ䛾ị䛾๭䜜ື䛝䛻䜘䜛⿕ᐖ䠈≉䛻Ṛஸ⿕ᐖ䛿௒䜎䛷▱䜙䜜䛶䛔䛺䛔䠊ᕝ㠃䛾෾⤖ị䛜ᦂ䜜䛷๭䜜䜛䛣䛸䛿䠈䝥䝺䞊䝖ෆᆅ㟈䛻䜘䜛▷࿘ᮇ䛾ᙉ䛔ᦂ䜜䛷䛒䜜䜀䛒䜚ᚓ䜛䛰䜝䛖䠊䛧䛛䛧䛭䜜䛷ᩘྡ䛾Ṛ

- 116 -⪅䛜⏕䛨䜛䛾䛰䜝䛖䛛䠊⌧௦䛾㛵㐃Ṛ䛻┦ᙜ䛩䜛ⴠỈ䛻䜘䜛ᚰ⮚㯞⑷➼䛿༑ศ䛒䜚ᚓ䜛䛜䠈ᙉ㟈ື䛻䜘䜛Ṛ⪅䛸⪃䛘䛶䛔䛔䛾䛰䜝䛖䛛䠊䛄୸ྜྷⓙᕝᐙ᪥グ䛅䠄㝃㘓 1 ཧ↷䠅䛻䛿䛂Ⓩ⡿䛾Ώ䛧ሙ䛷䛣䛾ᆅ㟈䛻䜘䛳䛶ே㤿䛜ᕝ䛷≛≅䛃䛸䠈ྠᵝ䛾஦㇟䛜ᐑᇛ┴䛾Ⓩ⡿䛷Ⓨ⏕䛧䛯䛸䠈䜔䛿䜚 20km ௨ୖ㞳䜜䛯୍䝜㛵ᕷ⸨ἑ⏫䛷䛾ఏ⪺䛸䛧䛶ṧ䛥䜜䛶䛔䜛䠊䛧䛛䛧䠈䛣䛾グ஦䛿ᚋ᪥㛫㐪䛔䛸䛧䛶᢯ᾘ䛥䜜䛶䛔䜛䠄௜ᅗ 1䠅䠊඲㒊䛛㒊ศ䛾㛫㐪䛔䛛䜎䛷䛿ุ䜙䛺䛔䛜䠈䛂Ⓩ⡿䛷༑୍ே㤿ᅄ༉䛜≛≅䛃䛻䛺䛳䛯஦ᐇ䛿↓䛛䛳䛯䠈䛣䛸䛿☜䛛䛷䛒䜛䠊໭ୖᕝἢ䛔䛻䠈䛣䛾ᆅ㟈䛻䜘䛳䛶⯪╔䛝ሙ䛷Ṛയ⪅䛜ฟ䛯䠈䛸䛔䛖შヰ䛜䛒䛳䛯䛣䛸䛿☜ᐇ䛷䛒䜛䛜䠈ᙉ㟈ື䛷ேⓗ≛≅䜎䛷⏕䛨䛯䛛䛿୙☜ᐇ䛥䛜ṧ䜛䠊䛯䛰䠈≛≅⪅䛜ฟ䛯䛸䛔䛖შヰ䜢⪺䛔䛶䜒䠈⪺䛔䛯ഃ䛜㐪࿴ឤ䜢ᢪ䛛䛺䛔⛬ᗘ䛻䛿ᛧ䛔ᦂ䜜䛷䛒䛳䛯䛣䛸䠈შ䜢⪺䛔䛯ሙᡤ䛷䛿≀ⓗ䛻䛿↓⿕ᐖ䛾᭷ឤᆅ㟈䛰䛳䛯䛣䛸䠈䛿⌧௦䛾䝥䝺䞊䝖ෆᆅ㟈䛸㢮ఝ䛧䛶䠈䛣䛾ᆅ㟈䛾㟈ᗘศᕸ䛸䜒Ⰻ䛟ᩚྜ䛩䜛䠊௒ᅇ䛿Ꮫ㝿ⓗ༠ຊ䛻䜘䛳䛶䠈ᩥព䛜㏻䜙䛺䛛䛳䛯⩻้ᩥ䛜ᆅ㟈䛻䜘䜛ᕝ䛾ị䛾๭䜜䠈䛸䛔䛖኱ኚ⌋䛧䛔஦㇟䜢ᣦ䛩䛣䛸䛜ุ䛳䛯䠊䜎䛯Ⓩ⡿䛷䛾Ṛയグ஦䛾᢯ᾘ䛿䠈ห⾜ᮏ䜔ᢤ⢋ᆅ㟈ྐᩱ㞟䠈ᆅ㟈᪥᫬䛻⤠䛳䛯ྐᩱ᥈⣴ㄪᰝ䛷䛿䠈ᣠ䛔䛝䜜䛺䛔ྍ⬟ᛶ䛜㧗䛔᝟ሗ䛷䛒䜛䠊᪥グྐᩱ䛾㏻ㄞ⩻้䛜䠈Ṕྐᆅ㟈◊✲䛻䜒኱ኚ᭷┈ୟ䛴㔜せ䛷䛒䜛䛣䛸䜢♧䛩ዲ౛䛸䛺䛳䛯䠊ⰼ஭᪥グ䛾䛟䛫Ꮠ䜒㏻ㄞ⩻้䛧䛛ゎỴ䛾㐨䛜䛺䛔䠊Ṕྐᆅ㟈䛿Ṕྐ䜔ᆅ㟈䛰䛡䛷䛺䛟ከ䛟䛾ศ㔝䛾༠ຊ䛜Ḟ䛛䛫䛺䛔Ꮫ㝿䛾ᴟ䜏䛷䛒䜛䛣䛸䜢♧䛧䛶䛔䜛䛸ゝ䛘䜛䠊㏿ᗘ䛾ᖹᆒ್䠖AVS30 䛾್䛷䛒䜛䠊PAC 䛾῝䛥䛻䜘䛳䛶䠈ྛᆅⅬ䛾ᓥᘼᵓ㐀ୖ䛾఩⨨䜢௦⾲䛥䛫䠈PAC 䛻䜘䜛␗ᖖ㟈ᇦ䜢㟈ᗘ䛾ண ᘧ䛻⡆༢䛻⤌䜏㎸䜣䛷䛒䜛䠊ྛᆅⅬ䛾ᆅ┙䛾Ⰻ䛧ᝏ䛧䛿 AVS30 䛷㟈ᗘ䛻཯ᫎ䛥䛫䛶䛔䜛䠊Mw6.5 䛾ሙྜ䛻 2.2 ⠇䛷᥎ᐃ䛧䛯㟈※䛻ᑐ䛧䛶ᘧ䠄1䠅䛛䜙ண᝿䛥䜜䜛ྛᆅⅬ䛾㟈ᗘ䜢⾲ 1䛻ᣲ䛢䛯䠊
AVS30 䛾ኳಖᮇ䛾⌧ᆅ䛾್䛿ᐇ 䛷䛝䛺䛔䛾䛷䠈⌧ᅾ䛾 J-SHIS[㜵⅏⛉Ꮫᢏ⾡◊✲ᡤ䠄2017䠅] 䛻䛒䜛250m 䝯䝑䝅䝳ẖ䛻᥎ᐃ䛥䜜䛯್䛷௦⏝䛧䛯䠊ྛᆅⅬ䛿୰ᮧ䞉ᯇᾆ䠄2018䠅䛸ྠᵝ䛻ᆅⅬ䛜ྵ䜎䜜䜛 250䡉䝯
䝑䝅䝳䜢≉ᐃྍ⬟䛺⢭ᗘ䛷఩⨨䜢ồ䜑䛶䛒䜛䠊⾲ 1 䛾
ྛᆅⅬ䛾ෆ䛷䠈ᆅ┙᮲௳䛜᭱䜒Ⰻ䛟ᦂ䜜㞴䛔䛾䛿໭ୖ㧗ᆅෆ䛾ᐑྂᕷ㛗ἑ䠈᭱䜒ᦂ䜜᫆䛛䛳䛯䛾䛿ὠ㍍⸬Ụᡞ⸬㑰䛾ᮾி㒔ቚ⏣༊䛺䛹ᮾிపᆅ䜔᪥ẚ㇂䛾ධỤ䛾ᇙ❧ᆅ䛷䛒䜛䠊䛣䜜䜙䛾ḟ䛻ᦂ䜜䜔䛩䛔䛾䛜᪂₲ᕷ䛾᪂⏣ᆅᇦ䛷䛒䜛ୖᡤ䛷䛒䜛䠊⾲ 1 䛻䛿ᆅ㟈䛾つᶍ䛜 Mw6.5 䛷䛒䜛ሙྜ䛾 ǻI䠖ᆅ┙᮲௳䜢
AVS30=300m/s 䛻ᥞ䛘䛶䠈ྠ䛨ᆅ┙᮲௳䛷㟈ᗘ䛾ᩘ್䜢ẚ㍑ྍ⬟䛻䛩䜛䛯䜑䛻ᚲせ䛺䠈ྛᆅⅬ䛾㟈ᗘ⿵ṇ್䜢♧䛧䛯䠊⿵ṇ್䛜ṇ䛾್䛾ᆅⅬ䛿 300m/s 䜘䜚ᅛ䛔ᆅ┙Ⰻዲ䛺ሙᡤ䠈㈇䛾್䛿䜘䜚ᰂ䜙䛛䛔ᝏ䛔ᆅ┙䛾ሙᡤ䛷䛒䜛䠊Mw6.5 䛾ᆅ㟈䛾ሙྜ䠈ィ 㟈ᗘ䛷
1.5 ㏆䛟⿵ṇ್䛻㛤䛝䛜䛒䜛䠊䛣䜜䛿Ⰻ䛔ᆅ┙䛷䛾㟈
ᗘ 3 䛾ᦂ䜜䛿䠈㟈※㊥㞳䜔 PAC 䛾῝䛥䛾᮲௳䛜ྠ䛨ᝏ䛔ᆅ┙䛷䛾㟈ᗘ 4.5 䛾ᦂ䜜䛻┦ᙜ䛩䜛䛣䛸䜢♧䛧䛶䛔䜛䠊ᆅ┙᮲௳䜢↓ど䛧䛶Ṕྐᆅ㟈䛾㟈ᗘ䜢ㄽ䛨䛶䜒↓ព࿡䛷䛒䜛䛣䛸䜢䜘䛟⾲䛧䛶䛔䜛䠊⾲ 1 䛾ከᩘ䛾୺ほⓗ㟈ᗘ䛿Ᏻ┤䛻䛿ᩘ್䛻䛿᥮⟬䛷䛝䛺䛔䠊䜎䛯ᘧ(1)䛿 Mw䠈㟈※㊥㞳䠈PAC 䛾῝䛥䠈
2.4 M 䛾᥎ᐃᆅ┙᮲௳䛸ィ 㟈ᗘ䛾 5 せ⣲䜢㍈䛸䛩䜛 5 ḟඖ✵㛫ෆ䛻ศᕸ䛩䜛᭤㠃䛸䛧䛶ண 㟈ᗘ䜢♧䛧䛶䛔䜛䠊2 ḟᆅ㟈つᶍ䜢᳨ウ䛩䜛䛯䜑䠈⏣୰䜋䛛䠄2017䠅䛾ィඖ⣬㠃䛷ㄝ᫂䛩䜛䛯䜑䛻 Mw 䜢ᅛᐃ䛧䠈䛥䜙䛻ᆅ┙㟈ᗘ䛾ண ᘧ䛾ෆ䛷䠈PAC ෆᆅ㟈ྥ䛡䛾ᘧ䠄1䠅䜢⏝᮲௳䛜 AVS30=300m/s 䛸୍ᐃ䛾ሙྜ䛾ᘧ䠄1䠅䛻䜘䜛䛔䛯ண ィ 㟈ᗘ್䛸⾲ 1 䛾ุᐃ㟈ᗘ䛸䛾ẚ㍑䜢⾜㟈※㊥㞳䛚䜘䜃ᆅⅬ┤ୗ䛾 PAC 䛾῝䛥䛻ᑐ䛩䜛ண䛳䛯䠊㟈ᗘ䜢䝁䞁䝍䞊⾲♧䛧䛶䠈䛣䛣䛻ྛྐᩱ᝟ሗᆅⅬInt(‫ܯ‬௪ , ο, Ɂ, ܸௌଷ଴ ) = 3.25 + 1.98‫ܯ‬௪ െ 3.72 logଵ଴ ο䛾㟈※㊥㞳䛸 PAC 䛾῝䛥䛾఩⨨䜢䠈ᆅ┙᮲௳䜢
െ0.00844 min(ߜ, 250) െ ‫ܯ( ܩ‬௪ , ܸௌଷ଴ ) (1)300m/s 䛻ᥞ䛘䜛䛾䛻ᚲせ䛺⿵ṇ್䛸ඹ䛻♧䛧䛯䠄ᅗణ䛧2䠅䠊㊥㞳ィ⟬䛻䛿 2.2 ⠇䛾㟈※䜢⏝䛔䛯䠊ᖾ䛔῝䛥‫ܯ(ܩ‬௪ , ܸௌଷ଴ ) = െ{1.814 + 0.192(‫ܯ‬௪ െ 7.9)} ×70km ⛬䛒䜛䛾䛷䠈Ẽ௝ᆅ᪉┤ୗ䛾⠊ᅖෆ䛷䛒䜜䜀䠈logଵ଴ { min ( ܸௌଷ଴ , 1000)}ᩘ༑䜻䝻㟈ኸ఩⨨䛜ື䛔䛶䜒䠈䝥䝻䝑䝖⟠ᡤ䛜䜾䝷䝣ᘧ䠄1䠅䛷‫ܯ‬௪ 䛿䝰䞊䝯䞁䝖䝬䜾䝙䝏䝳䞊䝗䠈οkm 䛿㟈୰䛷ᕥྑ䛻኱䛝䛟䛿ື䛛䛺䛔䠊ᚑ䛳䛶䠈㟈※䛜ከᑡື䛔䛶䜒䠈ண 䛥䜜䜛㟈ᗘ䛾ኚ໬䛿ᑠ䛥䛟䠈㟈※఩⨨※㊥㞳 䠈Ɂ km 䛿 CAMP 䝰䝕䝹[Hashimoto et al.
䠄2004䠅]䛛䜙ồ䜑䛯㟈ᗘᆅⅬ┤ୗ䛾 PAC ୖ㠃䛾῝䛥䠈 䛾ㄗᕪ䛿⤖ㄽ䛻䛿ᙳ㡪䛧䛺䛔䠊⾲ 1 䛷 ǻI >=0 䛷ᆅ┙᮲௳䛜 300m/s ௨ୖ䛷ᆅ┙ܸௌଷ଴m/s 䛿ྛᆅⅬ䛾ᆅ⾲䛛䜙 30m 䛾῝䛥䜎䛷䛾 S Ἴ- 117 -2003 ᖺ 5 ᭶ 26 ᪥䛾ᆅ㟈[㟈ᗘศᕸᅗ䛿ᆅ㟈ண▱䛾Ⰻ䛔ᆅⅬ䛿䠈300m/s 䛷䛒䛳䛯䛺䜙䜀ᅗ୰䛾Წ䛷♧䛧䛯䜘䛖䛻ᕥഃ䛾䜒䛳䛸㏆㊥㞳䛾኱㟈ᗘ䛸➼౯䛻䛺䜛䠊 ⥲ྜ◊✲᣺⯆఍䠄2003䠅䠈㝃㘓 2 ཧ↷]䜘䜚 M 䛜ᑠ䛥䛔䛣䛸䛿᫂ⓑ䛺䛾䛷䠈Mw6.7䠈6.5䠈6.3 䛾ሙྜ䜢ᅗ 2㏫䛻⿵ṇ್䛜㈇䛾ᆅⅬ䛿䠈ྑ䛻ᘏ䜃䜛Წ䛷♧䛧䛯䠈䛻♧䛧䛯䠊䠄a䠅Mw6.7 䛾ሙྜ䠈㟈ᗘ 5 䜔䛭䜜௨ୖ䛸ண䜘䜚㐲䛔ᑠ㟈ᗘ䛻┦ᙜ䛩䜛ᆅⅬ䛷䛒䜛䠊䛥䜜䜛ᆅⅬ䛷⿕ᐖ䛜↓䛔䛣䛸䜔䠈᭷ឤᆅⅬ䛜ᖥᮎ䛷䛒䜛䛻䜒㛵䜟䜙䛪ண 㟈ᗘ 2 ௨ୖ䛾⠊ᅖ䛻ྐᩱᆅⅬ䛜㝈䜙䜜䛶䛧䜎䛖Ⅼ䛜┠❧䛴䠊䠄c䠅 Mw6.3 䛷䛿᭱䜒㟈※㊥㞳䛜▷䛔ᆅⅬ䛷䜒ண 㟈ᗘ 4.5 ⛬ᗘ䛸䛺䜚䠈◚ᦆ⿕ᐖ䛜」ᩘ⟠ᡤ䛷⏕䛨䜛ᆅ㟈䛸䛧䛶䛿ᑠ䛥䛩䛞䜛䠊䠄b䠅Mw6.5 䛷䛿᭱䜒㟈※㊥㞳䛜▷䛔ᆅⅬ䛜㟈ᗘ
5 ⛬ᗘ䛻䛺䜚䠈᭷ឤᆅⅬ䜒㟈ᗘ 2 ᮍ‶䜎䛷ศᕸ䛧䛶䠈
PAC 䛾῝䛥䛜 100km ᮍ‶䛾㛵ᮾᆅ᪉䜎䛷䛜᭷ឤ䛻䛺䛳䛶䛔䜛ᅗ 1 䛾≉ᚩ䛸䜒ྜ⮴䛩䜛䠊䜘䛳䛶 1841 ᖺ䛾ᆅ㟈つᶍ䛿 Mw6.5 ⛬ᗘ䛷䠈㟈※䛻㏆䛟ᆅ┙᮲௳䛜ᝏ䛔ሙᡤ䛷䛿䠈⿕ᐖ䛜⏕䛨䛖䜛⛬ᗘ䛾つᶍ䛷䛒䛳䛯䛸
䛩䜛䠊Mw6.5 䛿Ẽ㇟ᗇ䛾䝬䜾䝙䝏䝳䞊䝗䛷䛿 0.1 ⛬ᗘ኱䛝䛟䛺䜛䛜[e.g. Ᏹὠ(1999)䛾ᅗ 3.5]䠈Ṕྐᆅ㟈䛾 M 䛾ุᐃ⢭ᗘ䛜 0.1 䛒䜛䛸䛔䛖ㄗゎ䜢ᛧ䜜䜛䛾䛷䠈ㄗᕪ䛾⠊ᅖ䛷つᶍ䛿 M6.5 ⛬ᗘ䛸䛩䜛䠊§3. 䜎䛸䜑ᐑᇛ䜔ᒾᡭ䛾㏆ୡ䛾᪥グ㢮䜢⢭ᰝ䛩䜛䛣䛸䛷䠈ᚑ᮶ぢゎ䛜ศ䛛䜜䛶䛔䛯ᆅ㟈䛻㛵䛧䛶௨ୗ䛾䛣䛸䛜ุ᫂䛧䛯䠊1841 ᖺ 1 ᭶ 19 ᪥༗๓ 10 ᫬㡭䠈Ẽ௝ᆅᇦ䛾ୗ 70km ⛬ᗘ䛷 M6.5 ⛬ᗘ䛾䝥䝺䞊䝖ෆᆅ㟈䛜Ⓨ⏕䛧䠈ᾛ㇂䛺䛹໭ୖᕝἢ䛔䛷◚ᦆ⿕ᐖ䛜⏕䛨䠈ᗈᇦ䛷⛥䛺ᙉ䛔ᦂ䜜䛸䛧䛶グ㘓䛥䜜䛯䠊㟈ኸ䛿໭⦋
39.0°±0.2° ᮾ⤒ 141.7°±0.2°䛷䛒䜛䠊໭ୖᕝ䜔ᨭὶ䛾Ụྜᕝ䛿౛ᖺ䜘䜚ᐮ䛔෤䛷ཌ䛔ị䛻そ䜟䜜䛶䛔䛯䛜䠈䛭䜜䛜」ᩘ⟠ᡤ䛷๭䜜ື䛔䛯䠊ዟᕞᕷ䜔Ⓩ⡿ᕷ䛾Ώ䛧ሙ䛷䛭䛾䛯䜑ᱞᶫ䛾◚ᦆ䜔」ᩘ䛾≛≅⪅䛜⏕䛨䛯䛸䛔䛖შヰ䛜䛒䛳䛯䛜䠈Ⓩ⡿䛿ᚋ᪥㛫㐪䛔䛸ุ᫂䛧䛯䠊ዟᕞᕷ䛾᪉䛿Ỉ㐠㛵㐃䛾┤᥋䛾⿕ᐖグ㘓䛿ぢ䛴䛛䛳䛶ᒃ䛺䛔䛾䛷䠈⌧᫬Ⅼ䛷䛿ேⓗ⿕ᐖ䛿୙☜ᐇ䛸䛩䜛䠊ᅗ 2䠊ᘧ䠄1䠅䛛䜙᥎ᐃ䛥䜜䜛(a) Mw6.7, (b) Mw6.5, (c)Mw6.3 䛾ሙྜ䛾㟈ᗘ䠄䝁䞁䝍䞊䛸䝖䞊䞁䛷⾲♧䠅䛸ྛᆅ䛾㟈ᗘ䛾ẚ㍑䠄ᆅ┙᮲௳ AVS30=300m/s ᫬䠅䠊⦪㍈䛿Ɂ䠈ᶓ㍈䛿ο䠊Ⰽ䛜⃰䛔䜋䛹㟈ᗘ䛜኱䛝䛔䠊
⾲ 1 䛾ྛᆅ䛾㟈ᗘ䜢㟈ᗘẖ䛾䝬䞊䜽䛷䠈ᆅ┙䛾⿵ṇศ䛿Წ䛷♧䛧䛯䠊ᆅ┙䛜䜘䜚Ⰻ䛔ᆅⅬ䛿ᕥഃ䛻ఙ䜃䛯Წ䛾ඛ䛾኱䛝䛔㟈ᗘ䛻 300m/s 䛷䛒䜜䜀ᡂ䜚䠈ᝏ䛔ᆅⅬ䛿ྑഃᲬඛ䛾ᑠ䛥䛔㟈ᗘ䛻ᡂ䜛䠊

Fig. 2. Predicted intensities for(a) Mw6.7, (b) Mw6.5,and (c) Mw6.3 cases by Eq. (1) with AVS30=300m/s
are shown with contours and darkness.
Observed intensities shown in Table1 are also shownby symbols. A horizontal bar from each symbol
shows the expected Intensity if Vs30=300m/s at eachsite.

- 118 -䛣䜜䜎䛷䛣䛾ᆅ㟈䛿₍↛䛸ᐑᇛ┴Ἀᆅ㟈䛷ᑠ䜆䜚䛾䝥䝺䞊䝖㛫ᆅ㟈䠈䛸䛥䜜䛶䛔䛯䠊Ᏻ᫆䛻୺ほⓗ⾲⌧䛾ᦂ䜜ලྜ䜢ᩘ್䛻⨨䛝᥮䛘䛺䛔᳨ウ䛸䠈㏆ᖺ⵳✚䛥䜜䛶䛝䛯⛻ᐦィ 㟈ᗘ䝕䞊䝍䛻䜘䜛ྛ✀ᆅ㟈䛸䛾㟈ᗘศᕸ䛾ẚ㍑䛻䜘䛳䛶䠈2003 ᖺ 5 ᭶䛾ᆅ㟈䛸㢮ఝ䛧䠈䛣䜜䜘䜚䛿ᑠつᶍ䛾 PAC ෆᆅ㟈䛷䛒䜛䛸௒ᅇุ᫂
䛧䛯䠊1978 ᖺᐑᇛ┴Ἀᆅ㟈䛸ྠ㢮䛾䝥䝺䞊䝖㛫ᆅ㟈䛷䛿䛺䛔䠊⿕ᐖᆅ㟈䛾䜹䝍䝻䜾䠷Ᏹబ⨾䜋䛛䠄2013䠅䠹
䛻䛿#242-1 䛸䛧䛶ຍ䛘䜛ᚲせ䛜䛒䜛䠊䜎䛯Ᏹὠ䛾䜹䝍䝻䜾䛻䛒䜛㈇യ⪅ 4 䛾᰿ᣐྐᩱ䛿ぢᙜ䛯䜙䛺䛔䛾䛷䠈⌧≧䛷䛿 some injured? 䛸䛧䛶 D1 䝺䝧䝹䛜ጇᙜ䛷䛒䜛䠊ྐᩱ䛾ゎ㔘䛻䛿᫬௦䛸ᆅᇦ䛻ᛂ䛨䛯ෆᐜ䛾ṇ䛧䛔ᢕᥱ䛜㔜せ䛷䛒䜛䠊௒ᅇ䛿㒓ᅵྐᐙ䛺䛹ከศ㔝䛾༠ຊ䜢ᚓ䛶₞䛟㏆ୡ䛾䝥䝺䞊䝖ෆᆅ㟈䜢 1 䛴≉ᐃ䛷䛝䛯䠊䜎䛯䠈Ṕྐᆅ㟈䛾㟈ᗘ䛾ෆ䠈≀ᦆ➼䛛䜙ᐈほⓗ䛺ุᐃ䛷ᚓ䛯㟈ᗘ䛷䛿䛺䛔䠈ᐃᛶⓗ䛺ᦂ䜜䛾⾲⌧䜢ᶵᲔⓗ䛻ᩘ್㟈ᗘ䛻⨨䛝᥮䛘䛯䜚䠈ྐᩱ୰䛾ᦂ䜜᪉䛾≉ᚩ䜢↓ど䛧䛯䜚䛩䜛䛸䠈䛒䜚䛝䛯䜚䛾䝥䝺䞊䝖㛫ᆅ㟈䛸䛔䛖䠈㛫㐪䛳䛯ᆅ㟈ീ䜢⤖䜆༴㝤ᛶ䜢♧䛩ዲ౛䛷䜒䛒䛳䛯䠊ᮏㄽ䜢ዎᶵ䛸䛧䛶䠈ዟᕞᕷ䛾⿕ᐖ≧ἣ䛾୍ḟྐᩱ䛺䛹䛾Ⓨぢ䛜ᚅ䛯䜜䜛䠊ㅰ㎡䛄ⰼ஭᪥グ䛅ཎᮏᡤⶶ䛾ⰼ஭ᘯ⨾Ặ䠈ᾛ㇂䛾㒓ᅵྐᐙᱜ஭ఙᏕẶ䠈㟷ⴥᒣྂᩥ᭩఍䛾㬼㣫ᖾᏊẶ䠈⇃㇂᪂୍Ặ䠈ᚿ⏣Ύ୍Ặ䠈ᚋ⸨୕ኵẶ䛻䛿ⰼ஭᪥グ䛾ෆᐜ䛾⣡ᚓ䛾䛔䛟⌮ゎ䛻Ḟ䛛䛫䛼ᚚ༠ຊ䛸ᚚᩍ♧䜢㡬䛔䛯䠊ⰼ஭Ặ䛸䛾㐃⤡䛻䛿ᐑᇛ┴ᩍ⫱ጤဨ఍䜢↹䜟䛫䛯䠊䛄୸ྜྷⓙᕝᐙ᪥グ䛅ᡤⶶ⪅䛾ⓙᕝ㱟୍Ặ䛚䜘䜃䛣䛾᪥グ䛾⩻้఍䛾䝯䞁䝞䞊䛾᪉䚻䛻䛿༳ๅබ⾲๓䛻ᮏᆅ㟈㛵㐃㒊ศ䛾᝟ሗ䜢ᥦ౪㡬䛝฼⏝䛾チྍ䜢㡬䛔䛯䜀䛛䜚䛛䠈⌋䛧䛔᢯ᾘ㒊ศ䛾ᥖ㍕
䜎䛷チㅙ䛧䛶ୗ䛥䛳䛯䠊AVS30 䛾್䛿㜵⅏⛉Ꮫᢏ⾡◊✲ᡤ䛾 J-SHIS 䜢฼⏝䛧䛯䠊䜎䛯䛭䛾฼⏝᫬䛻䛿▼㎶ᓅ⏨Ặ䛻ຓຊ㡬䛔䛯䠊⾜㇂⦅㞟㛗䛸༏ྡᰝㄞ⪅䛿ᮏ✏䜢ᗄศ䛛䛿ุ䜚᫆䛟䛩䜛䛯䜑䛻㈉⊩䛧䛶㡬䛔䛯䠊䛣䛣䛻グ䛧䛶ୖグྛ఩䛻ឤㅰ⏦䛧ୖ䛢䜛䠊Ụ่ᕷྐ⦅⧩䜢ᙜึ┘ಟ䛥䜜䛯ᨾ᳃჆ර⾨Ặ䛾ᚭᗏ䛧䛯᰿ᣐྐᩱ䜢ṧ䛩ጼໃ䛿䠈Ṕྐᆅ㟈◊✲䛻䜒኱䛝䛺ග䜢୚䛘䜛䜒䛾䛷䛒䜚䠈῝⏒䛺䜛ᩗព䜢⾲䛧䛯䛔䠊ᑐ㇟ᆅ㟈䠖1841 ᖺኳಖẼ௝ୗ䛾ᆅ㟈ᩥ ⊩㜵⅏⛉Ꮫᢏ⾡◊✲ᡤ, 2017, 30m ᖹᆒ S Ἴ㏿ᗘ䠈⾲ᒙ ᆅ ┙ 䠈 J-SHIS ᆅ 㟈 䝝 䝄 䞊 䝗 䝇 䝔 䞊 䝅 䝵 䞁䠄2017 ᖺ∧䠅䠈http://www.j-shis.bosai.go.jp/map/䠄ཧ↷ 2018-01-10䠅Ụ่ᕷྐ⦅⧩ጤဨ఍䠈1976䠈Ụ่ᕷྐ➨ 5 ᕳ㈨ᩱ
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ᮾி኱Ꮫᆅ㟈◊✲ᡤ䠈1989䠈᪂཰᪥ᮏᆅ㟈ྐᩱ⿵
㑇䠈pp.1222䠊
ᮾி኱Ꮫᆅ㟈◊✲ᡤ䠈1993䠈᪂཰᪥ᮏᆅ㟈ྐᩱ⥆⿵㑇䠈pp.1043䠊

- 119 -

Ᏹబ⨾㱟ኵ䠈1996䠈᪂⦅᪥ᮏ⿕ᐖᆅ㟈⥲ぴ:4161995䠈ᮾி኱Ꮫฟ∧఍䠈pp.493.
Ᏹ బ ⨾ 㱟 ኵ 䠈 1998 䠈᪥ ᮏ 䛾 Ṕ ྐ ᆅ 㟈 ྐ ᩱ ᣠ 㑇 䠈
pp.512.
Ᏹబ⨾㱟ኵ䠈1999䠈᪥ᮏ䛾Ṕྐᆅ㟈ྐᩱᣠ㑇ูᕳ䠈
pp.1045.
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Ᏹబ⨾㱟ኵ䞉▼஭ᑑ䞉௒ᮧ㝯ṇ䞉Ṋᮧ㞞அ䞉ᯇᾆᚊᏊ䠈
2013䠈᪥ᮏ⿕ᐖᆅ㟈⥲ぴ 599-2012䠈ᮾி኱Ꮫฟ∧఍䠈pp.694䠊Ᏹὠᚨ἞䠈1999䠈ᆅ㟈άື⥲ㄝ䠈ᮾி኱Ꮫฟ∧఍䠈
pp.876䠊ᾛ㇂⏫ᩥ໬㈈཭䛾఍䠈2002䠈ᾛ㇂䛾᪉ゝ㞟䠈ᾛ㇂⏫
ᩥ໬㈈཭䛾఍䠈pp.55.
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㝃㘓 1䠊㻌 ᮍห⾜䛄୸ྜྷⓙᕝ᪥グ䛅䛾グ㏙᢯ᾘ㒊ศ䛻䛴䛔䛶ᡤⶶ⪅ⓙᕝ㱟୍Ặ䛾チྍ䜢ᚓ䛶䠈ヱᙜ㒊ศ䛾⏬
ീ䜢⩻้බ⾲๓䛻䛣䛣䛻ᥖ㍕䛥䛫䛶䛔䛯䛰䛡䛯䠄௜ᅗ 1䠅䠊ྐᩱ䜢⩻้䛧䛯ห⾜ᮏ䛺䛹䛷䛿䠈ḍእ䛾㏣グ䛺䛹᢯ᾘ䛥䜜䛶䛔䛺䛔᝟ሗ䛿₃䜜䛺䛟ྵ䜎䜜䜛䛣䛸䛜
ᬑ㏻䛷䛒䜛䛜䠈ῧ௜䛾䜘䛖䛻㽢䛥䜜䛶䛔䜛㒊ศ䛾᝟ሗ䛻㛵䛧䛶䛿䠈䛭䜒䛭䜒ห⾜᫬┬䛛䜜䜛䛛䠈ὀグ௜䛝䛷ྵ䜑䛶䛟䜜䜛䛛䠈⩻้⪅ḟ➨䛾ྍ⬟ᛶ䛜㧗䛔䠊௒ᅇ᢯ᾘ஦㡯䜎䛷฼⏝䛷䛝䛯䛣䛸䛿䠈኱ኚᖾ㐠䛷䛒䛳䛯䠊⩻้ᩥ䠖༑஧᭶ᘘ୐᪥᫨ᅄ䝒᫬㻌 ኱ᆅ㟈ేู⪋③↓அೃ㻌 Ⓩ⡿⯪ሙΏ䛧䝙⪋⯪ᕝ୰䝙⪋㻌 ᆅ㟈㤿ᅄ␭ேᣠኍே䛂䛖䛭䛃ᇙ䝭ᕝධṚ䝇③ධೃὀ䠖⥙䜹䜿㒊ศ䛿ୖ䛛䜙ᾘ䛥䜜䛶䛔䜛㒊ศ䛷䛒䜛䠊
㝃㘓 2䠊㻌 ཧ↷ᆅ㟈䛾㟈ᗘศᕸᅗ䛻䛴䛔䛶䝕䞊䝍䝧䞊䝇䛾᳨⣴➼䛻୙័䜜䛺᪉ྥ䛡䛻䠈2.2⠇䛷ᣲ䛢䛯ᆅ㟈䛾㟈ᗘศᕸᅗ䛜⡆༢䛻䜹䝷䞊䛷ぢ䜙䜜䜛 URL 䜢ୗグ䛻ิᣲ䛧䛯䠊㜀ぴ⪅䛾ዲ䜏䛷⾲♧㡯┠䜔⫼ᬒᆅᅗ䠈ಸ⋡➼䜢ኚ᭦ྍ⬟䛺䜲䞁䝍䞊䝷䜽䝔䜱䝤䛺ศᕸᅗ䛾䝨䞊䝆䛿
2003/5/26 M7.1, 2011/4/7 M7.2, 2014/4/3 M5.5 䛜䛭䜜䛮䜜ୗグ䛷᳨⣴ᣦᐃ䛫䛪┤᥋ぢ䜙䜜䜛䠊
http://www.adep.or.jp/shindo/Screen/C51620.html
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http://www.adep.or.jp/shindo/Screen/C155547.html㟈ᗘ 5 ᙅ௨ୖ䛜ほ 䛥䜜䛯 2000 ᖺ௨㝆䛾ᆅ㟈䛻㛵䛧䛶䛿䝕䞊䝍䝧䞊䝇䛸䛿ู䛻㟈ᗘศᕸᅗ䛾㟁Ꮚ䝣䜯䜲䝹䛜⏝ព䛥䜜䛶䛚䜚䠈
2003/5/26 M7.1䠈2011/4/7 M7.2㻌 䛜䛭䜜䛮䜜
http://www.adep.or.jp/kanren/Eq_data/030526.html
http://www.adep.or.jp/kanren/Eq_data/110407.html
䛛䜙䝎䜴䞁䝻䞊䝗ྍ⬟䛷䛒䜛䠊䛣䛾䝃䜲䝖䛾᳨⣴ᶵ⬟䜢㥑౑䛧䛶኱㔞䛾㟈ᗘศᕸᅗ䜢⣔⤫ⓗ䛻ぢ䜛䛣䛸䛷⮬❧Ꮫ⩦⏕≀ AI ㅖ඗䛜኱㔞䛻ฟ⌧䛩䜛䛣䛸䜢ษ䛻㢪䛳䛶䛔䜛䠊㻌௜ᅗ 1. ࠗ୸ྜྷⓙᕝ᪥グ࠘ࡢ᢯ᾘ㒊ศ- 120 -