[論説] 1900年以降の宮城県北部の内陸地震の震度による短周期地震波発生域と地震規模の推定

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(1)ᱧผ࿾㔡㩷 ╙ 㪉㪌 ภ㩿㪉㪇㪈㪇㪀㩷㪍㪊㪄㪎㪋㗁㩷 ฃઃᣣ㩷㪉㪇㪈㪇㪆㪈㪆㪈㪊㪃㩷 ฃℂᣣ㩷㪉㪇㪈㪇㪆㪇㪍㪆㪈㪉㩷. 1900 ᐕએ㒠䈱ችၔ⋵ർㇱ䈱ౝ㒽࿾㔡䈱㔡ᐲ䈮䉋䉎⍴๟ᦼ࿾㔡ᵄ⊒↢ၞ䈫 ࿾㔡ⷙᮨ䈱ផቯ ዊၳ㐇ੑ⎇ⓥᚲ*㩷 ␹↰㩷 సਭ䊶ᱞ᧛㩷㓷ਯ Short-Period Seismic Wave Radiation Zone and Magnitude of Inland Earthquakes Occurring in Northern Miyagi Prefecture, Northeast Japan since 1900 Inferred from Seismic Intensity Data Katsuhisa KANDA and Masayuki TAKEMURA Kobori Research Complex Inc., 6-5-30, Akasaka, Minato-ku, Tokyo, 107-8502 Japan. The inland earthquakes in 1962, 1900 and 2003 in the northern part of Miyagi Prefecture were studied to clarify those earthquake source location and magnitudes related to short-period seismic waves. We carried out seismic intensity inversion analysis of the 1962 and 2003 earthquakes using fault models adopted from existing research results based on epicenter distribution of aftershocks and waveform inversion, and obtained their short-period seismic wave radiation zones. Since there was no source information regarding the 1900 earthquake, we carried out grid search analysis and obtained an optimal fault model which was located southwardly away from Kogota where the seismic intensity was the largest. However, we found the results might be adversely affected by a spatially biased seismic intensity distribution where the large intensity area was located in the northern part of Miyagi and there were no data in Iwate Prefecture. We therefore reexamined the 1900 earthquake using the data at only higher latitude than 38.25 degree to eliminate spatial bias of intensity distribution. In addition, we used only the seismic intensity data more than five lower in JMA scale, because there is no guarantee that all the data of intensity four and less are included in the data and low intensity without damage is evaluated less reliably than higher intensities with damage. We analyzed the both additional cases and obtained the result of the optimal fault plane locating in the northeast of Kogota. This area is located between the fault planes of the 2003 and 1962 earthquakes, and corresponds to the low-velocity area in the lower crust beneath the strain concentration zones in the northern Miyagi region. We also confirmed that the three shallow inland earthquakes in the northern Miyagi Prefecture occurred in different areas filling in the entire the strain concentration zones, which Takemura(2005a) pointed out. Their magnitude were similar and around M6.4. Keywords: Seismic Intensity Inversion, Inland Earthquake, Magnitude, Fault model, Northern Miyagi Prefecture. §1. 䈲䈛䉄䈮 ችၔ⋵ർㇱ䈪䈲 1900 ᐕએ㒠䈮 M6.5 䉪䊤䉴䈱ౝ㒽 ࿾Ზౝ࿾㔡䈏 1900 ᐕ 5 ᦬ 12 ᣣ䋬1962 ᐕ 4 ᦬ 30 ᣣ 䈍䉋䈶 2003 ᐕ 7 ᦬ 26 ᣣ䈱 3 ࿁⊒↢䈚䈩䈇䉎䋮ⵍኂ 䈱䈅䈦䈢࿾ၞ䈱࿾࿑䉕࿑ 1 䈮␜䈜䋮 1900 ᐕ䈱࿾㔡䈲䋬ቝ૒⟤(2003)䈮䉋䉎䈫䋬ችၔ⋵ ㆙↰㇭䈪ⵍኂ䈏ᄢ䈐䈒䋬᩶↢䋬⊓☨䋬ᔒ↰䈱ฦ㇭䉅 ំ䉏䈏ᒝ䈎䈦䈢䋮ධዊ‐↰᧛䋨⃻䋺⟤㉿↸䋩䈲 64 ᚭ䈱䈉䈤 45 ᚭ䈏ᄢ⎕ォୟ䈚䈢䋮ᩙේ㇭⧯ᩉ↸䋨⃻䋺ᩙේ Ꮢ䋩䈪ኅደోუ 5䋬ඨუ 2䋬⎕៊ 27䋬࿯⬿፣უ 20 䈪䈅䈦䈢䋮઄บ䈪䈲ო䈱ዊ੉ⵚ䈮䈫䈬䉁䉍䋬Ⴎ㊍䈪䈲ᾍ. ⓭䈏ୟ䉏䋬⍹၂䈏፣䉏䈢䋮 1962 ᐕ䈱࿾㔡䈲䋬᳇⽎ᐡ(2009)䈮䉋䉎䈫䋬㔡Ḯ䈲 ችၔ⋵⊓☨㇭䋨⃻:⊓☨Ꮢ䋩ㄼ↸ઃㄭ䈪䋬㔡Ḯᷓ䈘䈲 19km䋬᳇⽎ᐡ䊙䉫䊆䉼䊠䊷䊄 MJ䋽6.5 䈪䈅䈦䈢䋮ⵍኂ 䈲↰ዥ↸䋬ධᣇ᧛䋨⃻:⊓☨Ꮢධᣇ↸䋩䈏ਛᔃ䈪䋬ᱫ ⠪ 3 ੱ䋬⽶்⠪ 272 ੱ䋬ᑪ‛ోუ 340 ᫟䋬ඨუ 1114 ᫟䋮ἑፄ㚞䈱ධ䈪⽻ゞ䈏⣕✢ォⷒ䈚䋬ฎᎹᏒ䈪ᳯว ᯅ䈱ᯅᩴ䈏䈝䉏䉎䈭䈬䋬㋕㆏䉇㆏〝䈱ⵍኂ䈏⋡┙䈦䈢䋮㔡Ḯ䈮䈧䈇䈩䈲䋬ᴡ㊁䊶ઁ䋨1993䋩䈏ㄭᐕ䈱ᓸዊ ࿾㔡ᵴേ䉕฽䉃૛㔡ಽᏓ䈱⸃ᨆ䉕ⴕ䈇䋬䈠䈱⚿ᨐ 䈎䉌㔡Ḯၞ䈲ችၔ⋵ർㇱ䈱⧯ᩉ䋬▽㙚䋨⃻䋺ᩙේᏒ䋩䋬. *. 䇾107-8502 ᧲੩ㇺ᷼඙⿒ဈ 6-5-30 㩷㔚ሶ䊜䊷䊦:kandak䋣kajima.com, takemurm䋣kajima.com - 63 -.

(2) ㄼ䋬ධᣇ䋨⃻:⊓☨Ꮢ䋩䈮䉁䈢䈏䉎㐳䈘 15km ⒟ᐲ䈱࿾ ၞ䈪䈅䉎䈫⚿⺰ઃ䈔䈩䈇䉎䋮᳇⽎ᐡ(2009)䈱㔡ᄩ䈲䋬 ᩙේᏒ⧯ᩉ䈪ᴡ㊁䊶ઁ䋨1993䋩䈱␜䈚䈢㔡Ḯၞ䈱䈾䈿 ਛᄩ䈮૏⟎䈚䈩䈇䉎䋮 2003 ᐕ䈱࿾㔡䈲䋬0 ᤨ 13 ಽ䈮 MJ5.6 䈱೨㔡䋬7 ᤨ 13 ಽ䈮 MJ6.4 䈱ᧄ㔡䋬16 ᤨ 56 ಽ䈮 MJ5.5 䈱ᦨᄢ૛ 㔡䈏⊒↢䈚䈢䋮ᦨㄭ䈱᷹ⷰ䊂䊷䉺䈮䉋䈦䈩⹦⚦䈭૛ 㔡ಽᏓ䈱ᬌ⸛[Umino et al. (2003)]䉇㔡Ḯ䉟䊮䊋䊷䉳䊢䊮[䈢䈫䈋䈳 Hikima and Koketsu (2004)]䈏ⴕ䉒䉏䈩䈍䉍䋬䈠䉏䉌䈱⚿ᨐ䈎䉌ᧄ㔡䈲䋬ᚑἑ↸䋬⍫ᧄ↸ 䋨⃻䋺᧲᧻ፉᏒ䋩䋬ᴡධ↸䋨⃻䋺⍹ᏎᏒ䋩䋬ධㇹ↸䋨⃻䋺 ⟤㉿↸䋩䈮䉁䈢䈏䉎㐳䈘⚂ 15km ⒟ᐲ䈱࿾ၞ䈏㔡Ḯ ၞ䈫⠨䈋䉌䉏䈩䈇䉎䋮䈭䈍䋬᳇⽎ᐡ(2009)䈮䉋䉎㔡ᄩ 䈲䋬೨㔡䈏᧲᧻ፉᏒᄢႮ䋬ᧄ㔡䈏᧲᧻ፉᏒዊ㊁䋬ᦨ ᄢ૛㔡䈏⍹ᏎᏒ೨⼱࿾䈮䈅䉎䋮. §2. ⸃ᨆᣇᴺ䈭䉌䈶䈮䊂䊷䉺 2.1㩷 ⸃ᨆ᭎ⷐ ᬌ⸛㗄⋡䉕࿑ 2 䈱䊐䊨䊷࿑䈮␜䈜䋮ᗐቯ䈘䉏䉎㔡 Ḯᢿጀㄭற䈪ᦨㄭ⊒↢䈚䈢ਛዊ࿾㔡䈱⸘᷹㔡ᐲ䊂䊷䉺䉕෼㓸ಽᨆ䈚䋬㔡ᐲ䈱〒㔌ᷫ⴮ᑼ䈍䉋䈶ዪᚲ࿾ ⋚䈱ំ䉏䉇䈜䈘䉕⴫䈜ᜰᮡ䈪䈅䉎⋧ኻ㔡ᐲ䉕⹏ଔ䈜䉎䋮⸃ᨆኻ⽎䈫䈜䉎࿾㔡䈱㔡ᐲ䊂䊷䉺䈲䋬⹏ଔ䈚䈢⋧ ኻ㔡ᐲ䉕↪䈇䈩⵬ᱜ䈚䋬ំ䉏ᤃ䈘䈱ᓇ㗀䉕㒰䈒䋮1962 ᐕ䈫 2003 ᐕ䈱࿾㔡䈱㔡Ḯᢿጀ㕙䈮䈧䈇䈩䈲ᣢᓔ䈱 ⎇ⓥ䈭䈬䈮ၮ䈨䈇䈩઒ቯ䈜䉎䈏䋬1900 ᐕ䈱࿾㔡䈮䈧䈇䈩䈲㔡Ḯ䈮䈧䈇䈩ਇ᣿䈪䈅䉎䈢䉄䊐䉤䊪䊷䊄⸃ᨆ 䈮䉋䉎䉫䊥䉾䊄䉰䊷䉼䈮䉋䈦䈩㔡Ḯᢿጀ૏⟎䉕䈍䈍䉋䈠ផቯ䈚䈩䋬䈠䉏䈮ၮ䈨䈇䈩㔡Ḯᢿጀ㕙䉕઒ቯ䈜䉎䋮 ઒ቯ䈚䈢ᢿጀ㕙䈮ኻ䈚䈩⸃ᨆኻ⽎䈫䈜䉎࿾㔡䈱㔡ᐲ ಽᏓ䉕↪䈇䈩䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䉕ⴕ䈇䋬ᢿጀ㕙਄ 䈪䈱⍴๟ᦼ࿾㔡ᵄ䈱䉣䊈䊦䉩䊷ಽᏓ䈫ᦨㆡ䈭䊙䉫䊆䉼䊠䊷䊄䉕᳞䉄䉎䋮. ᩙේ㇭. ⧯ᩉ ▽㙚 ㄼ ↰ዥ ฎᎹ. ㆙↰㇭. ᔒ↰㇭. 38.5q. ዊ‐↰ ධㇹ ᚑἑ. ઄บ. ⸃ᨆኻ⽎࿾㔡㔡ᐲ࠺࡯࠲. ᦨㄭߩ࿾㔡ߩ ⸘᷹㔡ᐲ࠺࡯࠲. ࠨࠗ࠻Ⴧ᏷․ᕈߩ⵬ᱜ. ⋧ኻ㔡ᐲ⹏ଔ. ⊓☨㇭ ᣢᓔߩ ⎇ⓥ. ධᣇ ᶗ⼱. ࡈࠜࡢ࡯࠼⸃ᨆߦࠃࠆ ࠣ࡝࠶࠼ࠨ࡯࠴. ᩶↢㇭㔡Ḯᢿጀ 㕙ߩ઒ቯ. ᴡධ ⍫ᧄ. 〒㔌ᷫ⴮ᑼߩ࿁Ꮻ ࠗࡦࡃ࡯࡚ࠫࡦ⸃ᨆ ⍴๟ᦼ࿾㔡ᵄߩ ࠛࡀ࡞ࠡ࡯ಽᏓߣ ᦨㆡߥࡑࠣ࠾࠴ࡘ࡯࠼. Ⴎ㊍. ࿑ 2㩷 ᬌ⸛䊐䊨䊷 140.5q. 141.0q. 141.5q. ࿑ 1㩷 ችၔ⋵ർㇱ䈱࿾㔡䈪ⵍኂ䈱䈅䈦䈢࿾ၞ (ὐ✢䈲 1900 ᐕ㗃䈱㇭Ⴚ⇇) Fig. 1 Map showing damage area during the Northern Miyagi earthquakes. Broken lines show borders of county in 1900.. ᱞ᧛(2005a)䈲䋬䈖䈱 3 䈧䈱ችၔ⋵ർㇱ䈱࿾㔡䈮䈧䈇䈩ⵍኂ䈱⸥㍳䉇䉝䊮䉬䊷䊃䈭䈬䈎䉌ផቯ䈚䈢㔡 ᐲಽᏓ䊂䊷䉺䉕↪䈇䈩䋬࿾㔡ⷙᮨ䉇㔡Ḯ૏⟎䈱ផ ቯ䉕ⴕ䈇䋬หⷙᮨ䈱࿾㔡䈪㔡Ḯ䈏⇣䈭䉎䈖䈫䉕ᜰ៰ 䈚䈩䈇䉎䋮ᧄ⺰ᢥ䈪䈲䋬䈖䈱㔡ᐲ䊂䊷䉺䉕↪䈇䈩䉋䉍 ⹦⚦䈮࿾㔡ⷙᮨ䉇㔡Ḯ૏⟎䈱ಽᨆ䉕ⴕ䈉䋮䉁䈝䋬 2003 ᐕችၔ⋵ർㇱ䈱࿾㔡䈱೨㔡䊶ᧄ㔡䊶૛㔡䊂䊷䉺䉕↪䈇䈩㔡ᐲ䈱〒㔌ᷫ⴮ᑼ䉇ំ䉏䉇䈜䈘䉕⴫䈜⋧ ኻ㔡ᐲ䈱ಽᨆ䉕ⴕ䈉䋮ಽᨆ⚿ᨐ䈮ၮ䈨䈇䈩ችၔ⋵ർ ㇱ䈱 3 䈧䈱࿾㔡䈮ኻ䈚䈩㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䉕 ↪䈇䈩࿾㔡ⷙᮨ䉇⍴๟ᦼ࿾㔡ᵄ⊒↢ၞ䉕⸃ᨆ⊛䈮 ᣿䉌䈎䈮䈜䉎䋮䈠䈱㓙䋬1900 ᐕ䈱࿾㔡䈮䈧䈇䈩䈲䉫䊥䉾䊄䉰䊷䉼䈱ᚻᴺ䉕↪䈇䈩ᢿጀ㕙૏⟎䈱ᬌ⸛䉅ⴕ䈉䋮. Fig. 2 Flowchart of Analysis.. 2.2㩷㔡ᐲ䉟䊮䊋䊷䉳䊢䊮䈖䈖䈪↪䈇䉎㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈫䈲䋬⸳ቯ䈚䈢㔡Ḯ䊝䊂䊦䈎䉌ฦ࿾䈱㔡ᐲ䉕⹏ଔ䈜䉎⸃ᨆ䈱ㅒ ⸃ᨆ䋬䈜䈭䉒䈤㔡ᐲಽᏓ䈎䉌㔡Ḯ䉕ផቯ䈜䉎ᚻᴺ䈪䈅䉎[␹↰䊶ઁ(2003)]䋮㔡ᐲ⹏ଔ䈮䈲䋬╬ଔ㔡Ḯ〒㔌 Xeq[Ohno et al. (1993)]䈫᳇⽎ᐡ䊙䉫䊆䉼䊠䊷䊄 MJ 䈮㑐䈜䉎㔡ᐲ I 䈱〒㔌ᷫ⴮ᑼ(1)䉕↪䈇䉎䋮Ꮐㄝ䈱㔡ᐲ I 䈲䋬᷹ⷰ䈘䉏䈢㔡ᐲ䈎䉌ฦ࿾ὐ䈮䈍䈔䉎࿾⋚䈮䉋䉎 ំ䉏䉇䈜䈘䈱ᓇ㗀䉕␜䈜⋧ኻ㔡ᐲ䉕㒰䈇䈢୯䈫䈜䉎䋮 ⋧ኻ㔡ᐲ䈲䋬ᦨㄭ䈱ਛዊ࿾㔡䈱⸘᷹㔡ᐲ䉕ಽᨆ䈚䈩⹏ଔ䈜䉎䋮. I.

(3). a log X eq bM J c. (1). 䈖䈖䈪䋬k ⇟⋡䈱᷹ⷰὐ䈱╬ଔ㔡Ḯ〒㔌 Xeq,k 䈲䇮i ⇟⋡䈱㔡Ḯዊᢿጀ䈱⍴๟ᦼ䉣䊈䊦䉩䊷EIj 䈫(2)ᑼ䈱㑐ଥ䈮䈅䉎䈫䈜䉎䋮 2 X eq ,k. ¦ E i. Ii. X i2,k.

(4) ¦E i. Ii. (2). 䈖䈖䈪䋬ਅઃᢥሼ I 䈲⍴๟ᦼ࿾㔡ᵄ䈮㑐ଥ䈚䈢䊌䊤䊜 - 64 -.

(5) 䊷䉺䈪䈅䉎䈖䈫䉕␜䈜䋮(2)ᑼ䈱 Xeq 䈮(1)ᑼ䉕ᄌᒻ䈚䈢䉅䈱䉕ઍ౉䈚䈩䋬(3)ᑼ䈮␜䈜᜔᧤᧦ઙ䉕ട䈋䈢ᱷᏅ 䈱ᐔᣇ๺ J 䉕ᦨዊ䈮䈭䉎䉋䈉䈮ᦨዊ⥄ਸ਼ᴺ䈪 EIi 䉕ห ቯ䈜䉎䋮 §. ¦ ¨© X. J. k. Q. 2. ¦ 2 E p. Ip. 2.

(6) ¦ E ·¸ §¨ ¦ E ¹ ©

(7) Q ¦ 3E E. ¦ E Ii X i2,k. 2 eq , k. i. E Ip1 E Ip 2. Ii. i. 2. n. In. · N¸ ¹. 2. q. Iq. Iq 1. ⪤㊁. 2. E Iq 2 E Iq3

(8). 2. 38.5q. Q 2 ¦ 4 E Ir E Ir 1 E Ir 2 E Ir 3 E Ir 4

(9). 2. r. (3) 䈖䈖䈪䋬ฝㄝ 2 㗄䈲ዊᢿጀ䈏 N ୘䈱႐ว䉣䊈䊦䉩䊷 ୯䈱ᐔဋ䉕䋱䈮ⷙḰൻ䈜䉎䈢䉄ട䈋䈢䋮ฝㄝ 3 㗄䌾5 㗄䈲䋬䉣䊈䊦䉩䊷ಽᏓ䉕Ṗ䉌䈎䈮䈜䉎䈢䉄䈪䋬㗅⇟ 䈮 2 䈧䈎䉌 4 䈧䈱ዊᢿጀ䈫ធ䈚䈩䈇䉎ዊᢿጀ䈮㑐䈜䉎 ᜔᧤᧦ઙ䈪䈅䉎䋮䈖䈖䈪䋬Q䈲Ṗ䉌䈎䈘䈫ᱷᏅ䈱❗ዊ䈫䉕⺞ᢛ䈜䉎⿥䊌䊤䊜䊷䉺䈪䈅䉎䋮 2.3㩷 ⸃ᨆኻ⽎࿾㔡䈫㔡ᐲ䊂䊷䉺 ⸃ᨆኻ⽎࿾㔡䈫䈚䈩䈲䋬⴫ 1 䈮⻉ర䉕␜䈜ችၔ⋵ ർㇱ䈪⊒↢䈚䈢 3 䈧䈱ౝ㒽࿾㔡䈫䈚䋬䈠䉏䈡䉏ᧄ㔡䈱䉂䈫䈜䉎䋮㔡ᐲ䊂䊷䉺䈲䋬ችၔ⋵ർㇱ䈱࿾㔡䈮䈧䈇䈩䈲ᱞ ᧛(2005b)䉕↪䈇䈢䋮ᱞ᧛(2005b)䈲Ꮢ↸᧛න૏䈱䊂䊷䉺䈫䈚䈩⸥タ䈚䈩䈇䉎䈏䋬⸃ᨆ䈮䈲࿾ὐ䈫䈚䈩䊂䊷䉺ಣℂ䈜䉎ᔅⷐ䈏䈅䉎䈱䈪䋬䈠䉏䈡䉏䈱Ꮢ↸᧛䈱ᓎ ႐䈱૏⟎䈭䈬↸䈱ਛᔃ䈫⠨䈋䉌䉏䉎࿾ὐ䈱ᐳᮡ䉕↪ 䈇䉎䋮ᱞ᧛(2005b)䈲䋬ⵍኂ䈱⸥㍳䉇 2003 ᐕ䈱࿾㔡䈮䈧䈇䈩䈲䉝䊮䉬䊷䊃㔡ᐲ䈮ၮ䈨䈇䈩ฦ࿾䈱㔡ᐲ䉕 ⹏ଔ䈚䈩䈇䉎䋮䈖䈖䈪䈲䋬2003 ᐕ䈱࿾㔡䈲᳇⽎ᐡ䈎䉌 ⊒⴫䈘䉏䈢⸘᷹㔡ᐲ[᳇⽎ᐡ(2009)]䈱䊂䊷䉺䉅↪䈇䈢䋮࿑ 3 䈮 1900 ᐕ䈱࿾㔡䋬࿑ 4 䈮 1962 ᐕ䈱࿾㔡䋬䈘䉌䈮࿑ 5 䈮 2003 ᐕ䈱࿾㔡䈱ᱞ᧛(2005b)䈮ၮ䈨䈒䈠䉏䈡䉏䈱㔡ᐲಽᏓ䉕␜䈜䋮䈖䉏䉌䈱㔡ᐲ䊂䊷䉺䈲 ችၔ⋵ౝ䈱䉂䈪䈅䉎䋮࿑ 6 䈮᳇⽎ᐡ䈎䉌⊒⴫䈘䉏䈢 2003 ᐕ䈱࿾㔡䈱⸘᷹㔡ᐲ䈱ಽᏓ䉕␜䈜䋮䈖䉏䈲䋬ች ၔ⋵ᄖ䈱䊂䊷䉺䉅฽䉖䈪䈇䉎䋮. 38.25q. ⨃ࠤፒ. Ꮉፒ ᧛↰. ጤᴧ ᮎᧁ. ች. 38.0q. ৾ㇹ. ⨹ᵿ ศ↰ ጊਅ. ⷺ↰. 0. ㊄ጊ. 140.5q. Depth (km). 1900/5/12 1962/4/30 2003/7/26. 2:23 11:26 7:13. 141.1 141.134 141.171. 38.7 38.734 38.405. 7.0 6.5 6.4. 19 12. 141.5q. Fig. 3 Seismic intensity distribution of the 1900 event.. ⪤㊁. ᳇઄ᴧ. ᩙ㚤 ᵤਭᲫ ㊄ᚑ 㢩ᴛ ᦭⾐㝩㚂 ᴛㄝ ᄢጟ ን㊁ ⧯ᩉ ⧎ጊ ᔒᵄᆢ ⍹⿧ ች㊁ ᷷ᴰ ⇌ጟ ⍹᫪ ▽㙚 ᵻ᳓ ₹ᴛ ᣂ↰ ർᣇ ૒ᴧ ᷡṚ 㜞ᷡ᳓ ධᣇ᧲ ⊓☨ ⮮㉿ ችᴛ ධᣇ⷏ ☨ጊ 㐳ጟ ᴧㇱ ᧲ᄢፒ ᄢ⽾ ᐢේ ฎᎹ ን᳗ ↰ዥ ⨹㓶 ਛၡ ◌ጪ ዊ㊁↰ ਛᣂ↰ ᔒ↰ ർᶆ ዊ‐↰ రᶗ⼱ ᚑἑ ᢝ₹ ᶗ⼱㜞ୖ ਅદ႐㊁ ਇേၴ ਃᧄᧁ ᧻ጊ ධㇹ. 38.5q. ศጟ. ᧻ፉർ. ን⼱. ⑺଻. ᄢႮ 㣔᧪. ᓮጪ. ᔒᵤᎹ. ᯅᶆ ᅚᎹ. ⍹Ꮞ. ᧻ፉධ. 㞜Ꮉ. ઄บ. Ꮉፒ. 38.0q. ᄢᴡේ. ਗ਼ℂ. ⊕⍹. 140.5q. MJ. 20. 141.0q. km. ㊄ጊ. 0. ╩↭. Lat. (degree). 10. ࿑ 3㩷 1900 ᐕችၔ⋵ർㇱ࿾㔡䈱㔡ᐲಽᏓ[ᱞ᧛ (2005b)]. ⴫ 1㩷 ⸃ᨆኻ⽎䈱ችၔ⋵ർㇱ࿾㔡䈱࿾㔡⻉ర Table 1 Hypocentral parameters of the Northern Miyagi earthquakes considered in this study. Long. (degree). km. ဈర. ⿧ᴡ. ⿧ᴡ. Time. 㔡ᐲ 6+ 65+ 54 4-. ₹ᶆ ㅩ㓊. ਗ਼ℂ. ᄢᴡේ. ⊕⍹ ᄢᐔ. ᄢᎹ. ᗲፉ. *). Date (Yr/Mo/Dy). ᧻ጤ. 㠽⍫ፒ ᵤਭᲫ ጤࠤፒ ㊄ᚑ ᦭⾐ ⧎ጊ 㢩ᴛ የ᧻ ᴛㄝ ᄢጟ ⧯ᩉ ን㊁㊄↰ ᆢ᧻ ᔒᵄᆢ ⍹⿧ ች㊁㐳ፒ ⇌ጟ ⍹᫪ ৻ㄼ ▽㙚 ₹ᴛ ☨⼱ ૒ᴧ 㜞ᷡ᳓ ർᣇ ᷡṚ ධᣇ ⊓☨ ጤ಴ጊ ⮮㉿ ᴧㇱ ☨ጊ 㐳ጟ ศ↰ ᄢ⽾◌ጪ ᔒ↰ ን᳗ ↰ዥ ⼾㉿ ਛၡዊ‐↰ ਛᣂ↰ ฎᎹ ਛᵤጊ ᯅᶆ రᶗ⼱㜞ୖ ᢝ₹ർᶆ ਇേၴ ᶗ⼱ ᄢ⼱࿾ ਃᧄᧁ 㘵㊁Ꮉ ਅદ႐㊁ ᧻ጊ ೨⼱࿾ 㣮ፉบ᧲ ੑ⢆ 㣮෶ ධㇹ㣮ፉบ⷏ ᐢᷗ 㗇ᳯ ศጟ ᄢႮ ᧻ፉർ ⍹Ꮞ ⿒੗ ዊ㊁㣔᧪ ᧻ፉධ ㊁⫦ ೑ᐭ ৾ർ↰ ᶆᚭ ችᚭ Ⴎ┖ ጤಾ ේ↸ ઄บ ᐢἑ 㜞⍾ ᢥሼ. 141.0q. 10. 20. 㔡ᐲ 6+ 65+ 54 3. 141.5q. ࿑ 4㩷 1962 ᐕችၔ⋵ർㇱ࿾㔡䈱㔡ᐲಽᏓ[ᱞ᧛ (2005b)] Fig. 4 Seismic intensity distribution of the 1962 event.. ᵈ䋩1900 ᐕ䈱࿾㔡䈲ቝᵤ(1979)䈮䉋䉎䋮1962 ᐕએ㒠䈱࿾㔡䈲 ᳇⽎ᐡ䈱䊂䊷䉺䌛᳇⽎ᐡ(2009)䌝䈮䉋䉎䋮. - 65 -.

(10) 䊷䉺䈏 30 ▎ᚲએ਄䈱᷹ⷰὐᢙ䈱䈅䉎࿾㔡䈫䈜䉎䋮⴫ 2 䈮ᧄ㔡䉕฽䉃⹏ଔ䈮↪䈇䈢࿾㔡䈱⻉ర䉕␜䈜䋮䉁䈢䋬䈖䉏䉌䈱࿾㔡䈱㔡ᄩಽᏓ䉕࿑ 7 䈮␜䈜䋮. ᳇઄ᴧ ໊᪀. ᧻ጤ. ጤࡩፒ ᴛㄝ ⧎ጊ. ᔒᵄᆢ ৻ㄼ. ▽㙚. ⧯ᩉ ☨Ꮉ ⍹⿧ ૒ᴧ ቲᳯ. ☨⼱. ⮮㉿. ᔒᵤᎹ. 38.5q. N. 15. ⊓☨ ධᣇ᧲ 㜞ᷡ᳓ ☨ጊ ᚭୖ ችፒ ᵻፒ ᴧㇱ ฎᎹ ⼾㉿ ዊ㊁↰ ᶗ⼱ ਛᵤጊ ർᶆ ⦡㤗 ච੖ᵿ ೨⼱࿾ 㘵㊁Ꮉ ᧻ጊ ਃᧄᧁ ੑ⢆ 㣮ፉบ᧲ ർ᧛ ᄢ᧻ᴛ 㗇ᳯ ᄢⴧ ධㇹ ᐢᷗ Ⱜ↰ ᅚᎹ 㣮ፉบ⷏ ᄢႮ ☺Ꮉ Ⓑ੗ ⿒੗ ⍹Ꮞ ᄢ⼱ ᧻ፉർ ን⼱㣔᧪ ᧻ፉධ ዊ㊁ ೑ᐭ ৾ർ↰ 㞜Ꮉ ৾ࡩᵿ ઄บ ᐢἑ ේ↸ ᄙ⾐ၔ ጤ಴ጊ. 38.5q. 12. 16 17 14. T. 18 7 11 9 6 10 5. 1. 38.4q. 4. 2. W. 13. P E. S. 3 8. ৾ㇹ. 㜞㙚. M. Ꮉፒ. ᄢᴡ. 38.0q. 㔡ᐲ 6+ 65+ 54 3 2. ጤᴧ. ⦁ጟ. ⊕⍹. ৾ࡩኋ. ජ⽾. ᧛↰. ౞↰. Ⴧ↰. ਗ਼ℂ. ጊਅ. km. ဈర ਣ᫪. 0. 10. 20. ╩↭. 140.5q. 141.0q. 5.5 5.0 4.5 4.0. 10km. 38.3q 141.0q. 141.5q. ࿑ 5㩷 2003 ᐕችၔ⋵ർㇱ࿾㔡䈱㔡ᐲಽᏓ[ᱞ᧛ (2005b)]. 141.1q. 141.2q. 141.3q. 141.4q. ࿑ 7㩷 ⹏ଔ↪࿾㔡䈱㔡ᄩಽᏓ䈫ᧄ㔡䊜䉦䊆䉵䊛⸃䋨 ශ䈲ᧄ㔡䋬⇟ภ䈲⴫ 2 䉕ෳᾖ䋬ὐ✢䈲 2003 ᐕᤨὐ 䈱Ꮢ↸᧛Ⴚ⇇䋩[᳇⽎ᐡ(2009)] Fig. 7 Epicenter map of the 2003 event and its aftershocks for estimation of attenuation relationship and site correction factor.. Fig. 5 Seismic intensity distribution of the 2003 event.. ⴫ 2㩷 ⹏ଔ䈮↪䈇䈢࿾㔡䈱⻉ర[᳇⽎ᐡ(2009)] ᳇઄ᴧᏒ໊᪀↸. Table 2 Earthquake parameters of events showing Fig.6.. ᳇઄ᴧᏒ⿒ጤ ᩙේᏒ㢩ᴛ. 38.5q. ᩙේᏒᩙ㚤 ᩙේᏒ㊄ᚑ ᩙේᏒ⧎ጊ ᧄศ↸ᵤ⼱ ᩙේᏒ⧯ᩉ ⊓☨Ꮢ⍹⿧↸ ᩙේᏒ৻ㄼ ᩙේᏒᔒᵄᆢ ⊓☨Ꮢਛ↰↸ ᩙේᏒ㜞ᷡ᳓ ⊓☨Ꮢㄼ↸ ධਃ㒽↸ᔒᵤᎹ ⊓☨Ꮢ⊓☨↸ ᄢፒᏒጤ಴ጊ ᩙේᏒἑፄ ⊓☨Ꮢ☨ጊ↸ ችၔട⟤↸ችፒ ⊓☨Ꮢᵤጊ↸ ᄢፒᏒ↰ዥ ችၔട⟤↸ዊ㊁↰ ᄢፒᏒฎᎹਃᣣ↸ ⍹ᏎᏒ᩶↢↸ ችၔ⟤㉿↸ർᶆ ⦡㤗↸྾┖ ᶗ⼱↸ᣂ↸ ⍹ᏎᏒ⋧㊁⼱ ᄢፒᏒਃᧄᧁ ⍹ᏎᏒ㓶ൎ↸ ᄢፒᏒ᧻ጊ⍹ᏎᏒ೨⼱࿾ ችၔ⟤㉿↸ᧁ㑆Ⴆ ⍹ᏎᏒᄢⅶ ᅚᎹ↸ᅚᎹᵿ ᧲᧻ፉᏒ⍫ᧄ ᄢㇹ↸☺Ꮉ ⍹ᏎᏒᴰ↸ 㡆ἑ↸ዊ㊁ ᧻ፉ↸᧻ፉ. 㣮ፉบ↸ᐔᷰ. ᄢⴧ᧛ᄢⴧ ን⼱↸ን⼱. ઄บ㕍⪲඙ᄢୖ ઄บᴰ඙዁⋙ ೑ᐭ↸೑ᐭ ৾ࡩᵿ↸᧲ችᵿ ᄙ⾐ၔᏒਛᄩ ઄บችၔ㊁඙੖ベ ઄บ⧯ᨋ඙㆙⷗Ⴆ ઄บᄥ⊕඙ጊ↰. ઄บ㕍⪲඙⪭ว. ችၔᎹፒ↸೨Ꮉ. ฬขᏒჇ↰. ᧛↰↸᧛↰ ⬿₺↸౞↰ ᩊ↰↸⦁ጟ. 38.0q. ৾ࡩኋ↸㑐. ᄢᴡේ↸ᣂධ. ਗ਼ℂ↸ਅዊ〝. ਣ᫪↸㠽ደ. ጊర↸ᵻ↢ේ. 0. ਣ᫪↸਄Ṛ. 140.5q. km. 141.0q. 10. 20. 㔡ᐲ 6+ 65+ 54 3 2. 141.5q. ࿑ 6㩷 2003 ᐕችၔ⋵ർㇱ࿾㔡䈱ᧄ㔡䈱⸘᷹㔡ᐲಽ Ꮣ[᳇⽎ᐡ(2009)] Fig. 6 Seismic measured intensity distribution of the 2003 event [JMA(2009)].. §3䋮〒㔌ᷫ⴮ᑼ䈍䉋䈶⋧ኻ㔡ᐲ䈱⹏ଔ 3.1㩷 ⹏ଔ䈮↪䈇䈢࿾㔡〒㔌ᷫ⴮ᑼ䈍䉋䈶⋧ኻ㔡ᐲ䈱⹏ଔ䈮䈲 2003 ᐕች ၔ⋵ർㇱ࿾㔡䈱೨㔡䋬ᧄ㔡䈍䉋䈶૛㔡䋨2003 ᐕᧃ䉁䈪䋩䉕↪䈇䉎䋮䊙䉫䊆䉼䊠䊷䊄䈏 MJ҈4.0 䈎䈧㔡ᐲ䊂. 5.6. Depth (km) 11.55. Obs. stations 469. 6.4. 11.87. 733. 4.0. 12.36. 82. 38.4468. 4.2. 14.82. 38. 7:51 141.1937. 38.4650. 4.0. 14.05. 62. 726. 8:09 141.2138. 38.3905. 4.0. 13.25. 41. 2003. 726. 10:22 141.1647. 38.4565. 5.1. 13.01. 225. 8. 2003. 726. 10:25 141.1678. 38.4508. 4.0. 12.20. 51. 9. 2003. 726. 14:53 141.1678. 38.4628. 4.0. 12.66. 32. 10. 2003. 726. 16:56 141.1895. 38.5003. 5.5. 12.04. 349. Lat.. MJ. 0:13 141.1642. 38.4345. 7:13 141.1710. 38.4050. 726. 7:16 141.1890. 38.4175. 2003. 726. 7:19 141.1723. 5. 2003. 726. 6. 2003. 7. No. Year. Date. 1. 2003. 726. 2. 2003. 726. 3. 2003. 4. Time. Long.. 11. 2003. 727. 13:20 141.2162. 38.4790. 4.2. 11.01. 61. 12. 2003. 728. 4:08 141.1497. 38.4583. 5.1. 13.69. 218. 13. 2003. 808. 9:51 141.2265. 38.5197. 4.6. 10.83. 94. 14. 2003. 812. 9:27 141.1775. 38.4978. 4.3. 12.07. 88. 15. 2003. 827. 2:12 141.1337. 38.4835. 4.0. 14.11. 50. 16. 2003. 1023. 14:00 141.1883. 38.4670. 4.4. 12.23. 87. 3.2㩷 ࿁Ꮻ䈚䈢〒㔌ᷫ⴮ᑼ 〒㔌ᷫ⴮ᑼ䈮䈧䈇䈩䈲䋬ᵻ䈇࿾㔡䈱႐ว 100km 䉕⿥䈋䉎䈫⴫㕙ᵄ䉇 Lg ᵄ䈱ᓇ㗀䈏⠨䈋䉌䉏䉎䈱䈪䋬 ⴫ 2 䈪␜䈚䈢࿾㔡䈱㔡Ḯ〒㔌 100km એౝ䈱㔡ᐲ䊂䊷䉺䉕↪䈇䈩(1)ᑼ䉕࿁Ꮻ䈚䈩᳞䉄䉎䋮᳞䉄ᣇ䈲䋬␹ ↰䊶ઁ(2003)䈫ห᭽䈮䋬䉁䈝࿾㔡䈗䈫䈮 logX 䈱௑䈐䉕 ᳞䉄䋬䈠䈱ᐔဋ䉕ណ↪䈜䉎䋮ᰴ䈮 MJ 䈮㑐䈜䉎௑䈐䈫 ಾ 䉕᳞䉄䉎䋮ᦨ⚳⊛䈮〒㔌ᷫ⴮ᑼ䈫䈚䈩(4)ᑼ䉕ᓧ 䈢䋮. - 66 -. I 䋽 -2.92 logX +1.24 MJ + 0.91. (4).

(11) 䈖䈖䈪䋬㔡Ḯ〒㔌 X 䈲㔡ᐲ䉟䊮䊋䊷䉳䊢䊮䈭䈬䈱ᬌ⸛ 䉕ⴕ䈉႐ว䈲(2)ᑼ䈎䉌▚ቯ䈘䉏䉎╬ଔ㔡Ḯ〒㔌䉕↪ 䈇䉎䋮೨㔡䈍䉋䈶ᧄ㔡䈱㔡ᐲ䈫㔡Ḯ〒㔌䈱㑐ଥ䉕䈠䉏䈡䉏࿑ 8 䈍䉋䈶࿑ 9 䈮␜䈜䋮ታ✢䈪␜䈚䈢(4)ᑼ䈮 ኻ䈚䈩䈳䉌䈧䈐䈏㫧1.2 䈱▸࿐䈮෼䉁䉍〒㔌ᷫ⴮ᑼ䈏 ᅷᒰ䈪䈅䉎䈖䈫䈏䉒䈎䉎䋮䈭䈍䋬㔡Ḯ〒㔌 20km એౝ 䈱ㄭ࿾䈪〒㔌ᷫ⴮ᑼ䈮ኻ䈚䈩⧯ᐓᄢ䈐䉄䈱௑ะ䈏 ⷗䉌䉏䉎䈏䋬ំ䉏ᤃ䈘䈱ᓇ㗀䈮Ꮻ⌕䈘䈞䋬3.3 䈪␜䈜 ⋧ኻ㔡ᐲ䈪⵬ᱜ䈜䉎䈖䈫䈫䈜䉎䋮. ࿑ 8㩷㔡ᐲ䈱〒㔌ᷫ⴮䋭2003 ᐕ೨㔡(⴫ 2 䈱 No.1) Fig. 8 Distance attenuation relationship of seismic intensity –foreshock of the 2003 event.. MJ 䈮㑐䈜䉎௑䈐䈫ಾ 䈱ㆡวᕈ䉕␜䈜䈢䉄䈮䋬࿾ 㔡䈗䈫䈮䊙䉫䊆䉼䊠䊷䊄 MJ 䈫 I+2.92logX 䈱ᐔဋ୯䉕䊒䊨䉾䊃䈚䈢䉅䈱䉕࿑ 10 䈮␜䈜䋮᭎䈰✢਄䈮䊒䊨䉾䊃䈘䉏䋬(4)ᑼ䈮ኻ䈜䉎࿾㔡䈮䉋䉎䈳䉌䈧䈐䈲ዊ䈘䈇䋮ಽᨆ 䈮↪䈇䈢࿾㔡䈲䈾䈿✢਄䈮䈅䉍䋬䊙䉫䊆䉼䊠䊷䊄䈫㔡 ᐲ䈏✢ᒻ䈱㑐ଥ䈮䈅䉎䈖䈫䈏䉒䈎䉎䋮(4)ᑼ䉕⴫ 1 䈮␜ 䈚䈢࿾㔡䈮ㆡ↪䈚䈩䉅໧㗴䈭䈇䈫⠨䈋䉌䉏䉎䋮 3.3㩷 ⋧ኻ㔡ᐲ ⋧ኻ㔡ᐲ䈲䋬ታ㓙䈮᷹ⷰ䈘䉏䉎㔡ᐲ䈫〒㔌ᷫ⴮ᑼ 䈎䉌⹏ଔ䈘䉏䉎㔡ᐲ䈱Ꮕ䈫䈚䈩ቯ⟵䈚䋬䈠䈱᷹ⷰ࿾ὐ 䈱ំ䉏䉇䈜䈘䉕⴫䈜䋮⋧ኻ㔡ᐲ䈲ᄢ䈐䈇䈾䈬ំ䉏䉇䈜䈇䈖䈫䉕␜䈚䋬(4)ᑼ䈮䉋䉎〒㔌ᷫ⴮䉕㒰䈇䈢વ᠞ ⚻〝䈫⴫ጀ࿾⋚Ⴧ᏷䈱ᓇ㗀䈏฽䉁䉏䉎䋮᷹ⷰ㔡ᐲ䈎䉌⋧ኻ㔡ᐲ䉕㒰䈒䈖䈫䈮䉋䈦䈩䋬㔡Ḯ․ᕈ䈱ᓇ㗀䉕᣿ 䉌䈎䈮䈜䉎䈖䈫䈏䈪䈐䉎䋮⋧ኻ㔡ᐲ䈲⸘᷹㔡ᐲ䈱᷹ⷰ ὐ䈗䈫䈮᳞䉄䉌䉏䉎䈏䋬䈠䉏એᄖ䈱࿾ὐ䈲ᐔ㕙⊛䈮 ⵬㑆䈚䈩᳞䉄䉎䋮䈖䈖䈪䈲䋬ំ䉏䉇䈜䈘䈲㓞ធ䈚䈢࿾ ὐ䈪䉅⴫ጀ࿾⋚䈱․ᕈ䈮䉋䈦䈩ᄢ䈐䈒⇣䈭䉎䈖䈫䈏䈅䉎䈱䈪䋬⵬㑆䈱♖ᐲ䉕㜞䉄䉎䈢䉄䈮એਅ䈮␜䈜ᚻᴺ 䈮䉋䈦䈩⵬㑆䈜䉎䈖䈫䈮䈜䉎䋮 ᦨᄢㅦᐲ V 䈫㔡ᐲ I 䈱㑐ଥᑼ䈲䋬 (5)ᑼ䈮␜䈜㑐 ᢙᒻ䉕↪䈇䋬ଥᢙ b 䈲 2 ೨ᓟ䈱୯䈮䈭䉎䈖䈫䈏ᜰ៰䈘䉏䈩䈇䉎䌛᧛᧻䋨1996䋩䋬⠑Ꮉ䊶ઁ䋨1999䋩䈭䈬䌝䋮. I. b log V

(12) c. (5). 䈚䈢䈏䈦䈩䋬i ὐ䈮䈍䈔䉎ᦨᄢㅦᐲ Vi 䈫㔡ᐲ Ii 䈱㑐ଥ ᑼ䉕(6)ᑼ䈫䈍䈒䋮. Ii. 2 log Vi

(13) c. (6). ⋧ኻ㔡ᐲ䈏 0 䈫䈭䉎ᐔဋ⊛䈭࿾⋚Ⴧ᏷₸䈱࿾⋚䈱ᦨ ᄢㅦᐲ V0i 䈫㔡ᐲ I0i 䉕ᗐቯ䈜䉎䈫䋬 ࿑ 9㩷㔡ᐲ䈱〒㔌ᷫ⴮䋭2003 ᐕᧄ㔡䋨⴫ 2 䈱 No.2䋩 Fig. 9 Distance attenuation relationship of seismic intensity –main shock of the 2003 event. 10. I rel. ೨㔡. ᷹ⷰ 〒㔌ᷫ⴮ᑼ䊝䊂䊦. Vi. 2 0 4.0. 4.5. 5.0. MJ. 5.5. 6.0. (7). I i I 0i. §V · 2 log¨¨ i ¸¸ © V0i ¹. (8). Vs=600m/s ⋧ᒰ䈱⎬⾰࿾⋚䉕ၮ⋚䈫䈚䈢⴫ጀ࿾⋚Ⴧ ᏷₸䉕 Di 䋬વ᠞⚻〝䈱ᓇ㗀䈱ଥᢙ䉕 Ei 䋬⴫ጀ࿾⋚Ⴧ ᏷䈫વ᠞⚻〝䈱ᓇ㗀䉕㒰䈇䈢ၮḰ䈫䈭䉎ᦨᄢㅦᐲ VB 䈱ᑼ䈪ᦨᄢㅦᐲ Vi 䉕⴫䈜䋮. 6 4. 2 log V0i

(14) c. ⋧ኻ㔡ᐲ Irel 䈲䋬(6)ᑼ䈫(7)ᑼ䈎䉌(8)ᑼ䈪⴫䈞䉎䋮. ᧄ㔡. 8 E[I +2.92logX ]. I 0i. 6.5. ࿑ 10㩷䊙䉫䊆䉼䊠䊷䊄䈫〒㔌䈪⵬ᱜ䈚䈢㔡ᐲ䈱㑐ଥ. D i E iVB. (9). 䈘䉌䈮⋧ኻ㔡ᐲ䈏 0 䈫䈭䉎࿾⋚䈱ᦨᄢㅦᐲ䉕એਅ䈱 ᑼ䈫઒ቯ䈜䉎䋮. Fig. 10 Relationship between JMA magnitude and average intensity level without distance attenuation effect.. - 67 -. V0i. p0iVB. (10).

(15) (8)ᑼ䈮(9)ᑼ䈫(10)ᑼ䉕ઍ౉䈚䈩䋬⋧ኻ㔡ᐲ䈲એਅ䈱 ᑼ䈫䈭䉎䋮. I rel. §D E · 2 log¨¨ i i ¸¸ © p0 i ¹. 39°. (11). 䈖䈖䈪䋬(11)ᑼ䉕ᄌᒻ䈚䈩䋬ၮḰൻ䈘䉏䈢࿾⋚Ⴧ᏷䈱䈉䈤⴫ጀ࿾⋚Ⴧ᏷ಽ䉕㒰䈇䈢ଥᢙ䉕ᰴᑼ䈫䈍䈒䋮. Ei p0i. 1. Di. § I rel · ¨ ¸ 2 ¹. 10©. Ⴛ‫ݣ‬ᩗࡇ 1.6 1.2 0.8 0.4 0.0 -0.4 -0.8 -1.2 -1.6 -2.0. (12) 38°. (12)ᑼ䈲䋬⴫ጀ࿾⋚Ⴧ᏷䉕㒰䈇䈢ᵄേવ᠞⚻〝䈱㆑ 䈇䈱䉂䉕⴫䈚䈩䈇䉎䈱䈪ዪᚲ⊛䈭ᄌേ䈏ዋ䈭䈇䈫⠨ 䈋䉌䉏䉎䋮䈖䉏䉕࿾ὐ䈗䈫䈱୯䉕 GMT 䈱 Gridding ᚻ ᴺ[Smith and Wessel(1990)]䉕↪䈇䈩ᐔ㕙⊛䈮⵬㑆䈚䈩 3 ᰴ䊜䉾䉲䊠䋨⚂ 1km ྾ᣇ䋩䊂䊷䉺䈫䈜䉎䋮䈖䉏䉕(11) ᑼ䈮ઍ౉䈚䈩⋧ኻ㔡ᐲ䈱䊜䉾䉲䊠䊂䊷䉺䉕᳞䉄䉎䋮㔡ᐲ᷹ⷰὐ䈱⋧ኻ㔡ᐲ䈲䋬⴫ 2 䈪␜䈚䈢࿾㔡䈗䈫䈮᳞䉄䋬ో䈩䈱࿾㔡䈪ᐔဋ䈚䈩⹏ଔ䈜䉎䋮࿑ 11 䈮ᓧ 䉌䉏䈢⚿ᨐ䉕␜䈜䋮Gridding ᚻᴺ䉕↪䈇䈩䋬䈖䉏䉕න ⚐䈮ᐔ㕙⵬㑆䈜䉎䈫࿑ 12 䈮␜䈜䉋䈉䈮䈭䉎䈏䋬䈖䉏䈪䈲ጊ㑆ㇱ䈭䈬䈱㔡ᐲ᷹ⷰὐ䈏ዋ䈭䈇࿾ၞ䈪䈲⺋Ꮕ 䈏ᄢ䈐䈒䈭䉎䈱䈪䋬೨ㅀ䈱ᚻᴺ䉕↪䈇䈩ᡷༀ䈜䉎䋮䉁䈝䋬↪䈇䉎 Vs=600m/s ⋧ᒰ䈱⎬⾰࿾⋚䉕ၮ⋚䈫䈚䈢 ⴫ጀ࿾⋚Ⴧ᏷₸Di 䉕࿑ 13 䈮␜䈜䋮⴫ጀ࿾⋚Ⴧ᏷₸ Di 䈲䋬⧯᧻䊶ઁ䋨2005䋩䈱ᚻᴺ䈍䉋䈶䊂䊷䉺䉕↪䈇䈩 ⴫ጀᓸ࿾ᒻ䈎䉌⴫ጀ࿾⋚䈱ᐔဋ S ᵄㅦᐲ䉕੺䈚䈩▚ ቯ䈜䉎䋮㡆ἑᎹ䉇ർ਄Ꮉᵹၞ䈱ᐔ㊁䉇ਗ਼ℂᶏጯૐ ࿾Ꮺ䈪㤥䈒䋬࿾⋚Ⴧ᏷₸䈏ᄢ䈐䈇䈖䈫䈏䉒䈎䉎䋮ᦨ⚳ ⊛䈮ᓧ䉌䉏䈢⋧ኻ㔡ᐲಽᏓ䉕࿑ 14 䈮␜䈜䋮࿑ 12 䈫 Ყ䈼䈩ಽ䈎䉎䉋䈉䈮䋬⋧ኻ㔡ᐲ䈲⴫ጀᓸ࿾ᒻ䈮䉋䉎 ࿾⋚Ⴧ᏷₸䈱ⶄ㔀䈭ᄌൻ䈏⠨ᘦ䈘䉏䈢䋮. 141°. 142°. ࿑ 12㩷 න⚐ᐔ㕙⵬㑆䈮䉋䈦䈩ᓧ䉌䉏䈢⋧ኻ㔡ᐲಽᏓ䉮䊮䉺䊷 Fig. 12 Contour map of site correction factor obtained from two-dimensional interpolation technique. 39°. ҅ɥ߷්؏ ᯚແ߷්؏. ʠྸෙެ ˯‫࠘ע‬ 38°. ‫ע‬Ⴔ‫ྙࠢف‬ 3.3 3.0 2.7 2.4 2.1 1.8 1.5 1.2 0.9. 141°. 142°. ࿑ 13㩷 Vs600m/s ⋧ᒰ䉕ၮ⋚䈫䈚䈢࿾⋚Ⴧ᏷₸ [⧯᧻䊶ઁ(2005)䈮ၮ䈨䈇䈩▚ቯ] Fig. 13 Distribution map of soil amplification factor from base layer of 600m/s in shear velocity.. 39q. 39q. Ⴛ‫ݣ‬ᩗࡇ 0.6~1.6 0.0~0.6 -0.6~0.0 -1.9~-0.6. 38q. 141q. ࿑ 11㩷㔡ᐲ᷹ⷰὐ䈱⋧ኻ㔡ᐲ Fig. 11 Site correction factor at observation stations.. Ⴛ‫ݣ‬ᩗࡇ 1.6 1.2 0.8 0.4 0.0 -0.4 -0.8 -1.2 -1.6 -2.0. 38q. 141q. 142q. 142q. ࿑ 14㩷 ࿾⋚Ⴧ᏷₸䈮䉋䉍⵬㑆䈚䈢⋧ኻ㔡ᐲಽᏓ Fig. 14 Distribution map of site correction factor corrected with soil amplification factors.. - 68 -.

(16) §4䋮㔡ᐲ䈮䉋䉎㔡Ḯផቯ 4.1㩷 2003 ᐕ 7 ᦬ 26 ᣣ䈱࿾㔡 4.1.1㩷 ⸃ᨆ᧦ઙ 2003 ᐕ䈱࿾㔡䈮䈧䈇䈩䈲䋬ᦨㄭ䈱᷹ⷰ䊂䊷䉺䈮 ၮ䈨䈇䈢೨㔡䈍䉋䈶૛㔡䈱ಽᏓ䉇䊜䉦䊆䉵䊛䈱ᬌ⸛ [Unimo et al.(2003)䋬Okada et al.(2003)]䋬㔡Ḯ䉟䊮䊋䊷䉳䊢䊮䈮䈧䈇䈩䈲䋬ᒝ㔡േ⸥㍳䉕↪䈇䈢ᬌ⸛ [Hikima and Koketsu(2004) 䈭䈬 ] 䉇 GPS 䋬 ᷹ ࿾ 䉇 InSAR 䊂䊷䉺䉕↪䈇䈢ᬌ⸛[Nishimura et al.(2003)] 䈏ႎ๔䈘䉏䋬㔡Ḯᢿጀ䈮䈧䈇䈩᣿䉌䈎䈮䈘䉏䈩䈇䉎䋮䈖䈖䈪䈲䋬1900 ᐕ䈍䉋䈶 1962 ᐕ䈱࿾㔡䈱ᢿጀ䊝䊂䊦䉇࿾㔡ⷙᮨ䈱ၮḰ䈫䈜䉎䈫䈫䉅䈮⸃ᨆ䈱ᅷᒰᕈ䈱 ᬌ⸽䈱૏⟎䈨䈔䈫䈚䈩 2003 ᐕ䈱࿾㔡䈱㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䉕↪䈇䈢ᬌ⸛⚿ᨐ䉕␜䈜䋮 ઒ቯ䈜䉎ᢿጀ㕙䈮䈧䈇䈩䈲䋬◲⇛ൻ䈱䈢䉄 1 㕙䈮䉁䈫䉄䋬Hikima and Koketsu(2004)䈱ᧄ㔡ർᢿጀ䉕ධ 䈮 4km ᜛ᒛ䈚䈢࿑ 15 䈮ᄥታ✢䈪␜䈜⍱ᒻ䈱ᢿጀ㕙䈫䈚䈢䋮઒ቯ䈚䈢ᢿጀ䊌䊤䊜䊷䉺䉕⴫ 3 䈮␜䈜䋮ዊᢿ ጀ䈲䋬䉰䉟䉵䈏 Hikima and Koketsu(2004)䈫ห䈛 2km ⷺ䈫䈚䋬8×5 䈱 40 䊜䉾䉲䊠䈫䈜䉎䋮࿑ 5 ෸䈶࿑ 6 䈮␜䈚䈢 2 ⒳㘃䈱㔡ᐲ䊂䊷䉺䉕↪䈇䈩䋬ੑㅢ䉍䈱⸃ᨆ䉕ⴕ 䈉䋮 141.1q. 141.2q. 4.1.2㩷㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ ೋᦼ઒ቯᢿጀ㕙䉕↪䈇䈩䊙䉫䊆䉼䊠䊷䊄䉕 0.1 ೞ 䉂䈪ᄌ䈋䈩㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䉕ⴕ䈉䋮ᱞ᧛䊂䊷䉺[ᱞ᧛(2005b)]䈍䉋䈶᳇⽎ᐡ⸘᷹㔡ᐲ䊂䊷䉺䈱႐ ว䈱㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈮䉋䉎⺋Ꮕᦨዊ䈫䈭䉎䉬䊷䉴䈱䉣䊈䊦䉩䊷ಽᏓ䉕࿑ 16 䈮␜䈜䋮䈭䈍䋬࿑ 17 䈮䊙䉫䊆䉼䊠䊷䊄䈫⺋Ꮕ䈱㑐ଥ䉕␜䈜䋮ᱞ᧛䊂䊷䉺䈪䈲 M6.3 䈱႐ว䈏⺋Ꮕᦨዊ䈫䈭䉍䋬᳇⽎ᐡ⸘᷹㔡ᐲ 䊂䊷䉺䈪䈲 M6.4 䈱႐ว䈏⺋Ꮕᦨዊ䈫䈭䈦䈢䋮ᱞ᧛䊂䊷䉺䈲 0.5䌾1.0 ೞ䉂䈱㔡ᐲ䊂䊷䉺䈪䋬᳇⽎ᐡ⸘᷹㔡 ᐲ䊂䊷䉺䈲 0.1 ೞ䉂䈱䊂䊷䉺䈪䈅䉎䈱䈪䋬ᱞ᧛䊂䊷䉺䈱ᣇ䈏ᔅὼ⊛䈮⺋Ꮕ䈲ᄢ䈐䈒䈭䉎䋮䉣䊈䊦䉩䊷ಽᏓ 䈲㔡ᐲ䈎䉌᳞䉄䈩䈇䉎䈱䈪⍴๟ᦼ࿾㔡േ䈱⊒↢ၞ 䈮㑐ଥ䈚䈩䈇䉎䋮᭎䈰ᢿጀ䈱ർ஥䈮䉣䊈䊦䉩䊷䈱ᄢ 䈐䈇㗔ၞ䈏䈅䉎䈖䈫䈏ಽ䈎䉎䋮䈖䉏䈲䋬ධ䈎䉌ർ䈮⎕ უ䈏ㅴ䉖䈣䈫⠨䈋䉎䈫䋬࿑ 15 䈮␜䈚䈢ᒝ㔡േ䈎䉌⹏ ଔ䈘䉏䈢䈜䈼䉍䈱ᄢ䈐䈇ㇱಽ䈱⚳┵ㇱ䈮૏⟎䈚䈩䈇䉎䋮. 38q 30'. 38q 30'. 141.3q E. E 3 2 1 0. 38q 20'. ˎ‫ޖૺܭ‬᩿. ˷ᩗ. ஜᩗᩗ‫ځ‬. 141q 00'. 141q 10'. 10km 141q 20'. 3 2 1. 38q 20' 141q 00'. 141q 10'. 0 10km 141q 20'. (a)ᱞ᧛䊂䊷䉺(M6.3)㩷㩷㩷 (b)JMA 䊂䊷䉺(M6.4) ࿑ 16㩷 2003 ᐕ࿾㔡䈱㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ⚿ᨐ. ẴỔụ (m) 1.2 1.0 0.8 0.6 0.4 0.2 0.0. Fig. 16 Map showing energy distribution from seismic intensity inversion of the 2003 event.. 10 km. ࿑ 15㩷 ઒ቯᢿጀ㕙䋨Hikima and Koketsu(2004)䈱 2003 ᐕᧄ㔡䈱䈜䈼䉍ಽᏓ䈮ട╩䋩 Fig. 15 Fault model of main shock of the 2003 event.. ⴫ 3㩷 2003 ᐕ࿾㔡䈱઒ቯᢿጀ䊌䊤䊜䊷䉺 Table 3 Fault model parameters for the 2003 event. ⿛ะ ௑ᢳ ᢿጀ㐳䈘 ᏷ ਄┵ᷓ䈘 ਅ┵ᷓ䈘. N186°E 52°W 16km 10km 6.5km 14.4km. ࿑ 17㩷䊙䉫䊆䉼䊠䊷䊄䈫⹏ଔ⺋Ꮕ䋨2003 ᐕ࿾㔡䋩 ᳇⽎ᐡ⸘᷹㔡ᐲ䊂䊷䉺䈲 0.1 ೞ䉂䋬ᱞ᧛䊂䊷䉺䈲 2, 3, 4, 4.75, 5.25, 5.75, 6.25 䈱 7 Ბ㓏. Fig. 17 Errors of intensity of the 2003 event estimated by seismic intensity inversion analysis versus magnitude.. 4.2㩷 1962 ᐕ 4 ᦬ 30 ᣣ䈱࿾㔡 4.2.1㩷 ችၔ⋵ᄖ䈱᳇⽎ᐡ㔡ᐲ䊂䊷䉺䈱ㅊട 1962 ᐕ䈱࿾㔡䈱㔡ᐲಽᏓ䈲࿑ 4 䈮␜䈜䉋䈉䈮ች. - 69 -.

(17) ၔ⋵ർㇱ䈮㔡ᐲ䈱ᄢ䈐䈇࿾ὐ䈏㓸ਛ䈚䈩䈇䉎䈱䈪䋬㔡ᐲಽᏓ䈎䉌㔡Ḯᬌ⸛䈜䉎䈢䉄䈮䈲ർ䈱ጤᚻ⋵䈱㔡ᐲ䊂䊷䉺䈏䈅䉎䈖䈫䈏ᦸ䉁䈚䈇䋮䈠䈖䈪䋬ችၔ⋵એ ᄖ䈮䈧䈇䈩䈲ᵿ᧻䊶ቝ૒⟤(1985)䈮⸥タ䈘䉏䈢ฦ࿾ 䈱㔡ᐲ䊂䊷䉺䉕↪䈇䉎䈖䈫䈫䈜䉎䋮⸃ᨆ䈮↪䈇䉎㔡ᐲ 䊂䊷䉺䉕࿑ 18 䈮␜䈜䋮 ችၔ⋵䈣䈔䈱㔡ᐲ䊂䊷䉺䈱႐ว䈫䈠䉏એᄖ䈱⋵ 䈱㔡ᐲ䉕ઃട䈚䈢႐ว䈱㔡ᐲ䈫㔡Ḯ〒㔌䈱㑐ଥ䉕࿑ 19 䈮␜䈜䋮M6.5 䈱႐ว䈱〒㔌ᷫ⴮ᑼ䉕ታ✢䈪␜䈚䋬 ᭎䈰ᮡḰ஍Ꮕ䈱 2 ୚䈱▸࿐䋨I㫧1.2䋩䉕⎕✢䈪␜䈜䋮㔡ᐲ䊂䊷䉺䈲〒㔌ᷫ⴮ᑼ䈱ᮡḰ⊛䈭䈳䉌䈧䈐䈱▸ ࿐䈮෼䉁䉍䋬ችၔ⋵ౝᄖ䈱䊂䊷䉺䉕ว䉒䈞䈢䉅䈱䈪 ໧㗴䈭䈇䈫್ᢿ䈚䈢䋮⋧ኻ㔡ᐲ䈲䋬࿑ 14 䈮䈲⴫␜䈘䉏䈩䈇䈭䈇㆙ᣇ䈮䈧䈇䈩䉅 3.3 䈮␜䈚䈢ᚻᴺ䈪᳞䉄䈢䉅䈱䉕↪䈇䈢䋮. 0. km 50. 4.2.2㩷㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ ᴡ㊁䊶ઁ(1993)䈮␜䈘䉏䈢ᧄ㔡䈱䊜䉦䊆䉵䊛⸃䈍䉋䈶૛㔡ၞ䉕ෳ⠨䈮䈚䈩࿑ 20 䈮␜䈜䉋䈉䈮ᢿጀ㕙䉕઒ ቯ䈜䉎䋮ᢿጀ䈱⿛ⴕ N203°E䋬௑ᢳ 50°W 䈫䈜䉎䋮ᢿ ጀ䈱ᄢ䈐䈘䈲䋬2003 ᐕ䈱࿾㔡䈫ห䈛ᢿጀ㐳䈘 16km䋬 ᏷ 10km 䈪䋬ዊᢿጀ䉅ห᭽䈮䉰䉟䉵䈏 2km ⷺ䈫䈚䋬 8×5 䈱 40 䊜䉾䉲䊠䈫䈜䉎䋮ᷓ䈘䈲 6.5䌾14.2km 䈫䈭䉎䋮 ࿑ 21 䈮 M6.5 䈱႐ว䈱㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ⚿ ᨐ䉕␜䈜䋮䈖䈱႐ว䉅㔡ᄩ䉋䉍⷏஥䈱䉇䉇ᷓ䈇૏⟎ 䈪⍴๟ᦼ䉣䊈䊦䉩䊷䈱᡼಴䈏ᄢ䈐䈇䈖䈫䈏ಽ䈎䉎䋮 ࿑ 22 䈮䊙䉫䊆䉼䊠䊷䊄䉕ᄌ䈋䈩▚ቯ䈚䈢㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈮䉋䉎㔡ᐲ䈱⹏ଔ⺋Ꮕ䉕␜䈜䋮M6.5 䈱 ႐ว䈏䋬⺋Ꮕ䈱 RMS ୯䈲 0.693 䈪ᦨዊ䈮䈭䈦䈢䋮 140.0. 38.9. 140.1. 140.3. 㔡ᄩ 38.8. 100. ઒ቯᢿጀ㕙. 40q. 38.7. 38.6 39q. 37q 139q. 140q. 141q. ᧄ㔡ࡔࠞ࠾࠭ࡓ⸃. 0. 0. 10. 10. ᷓߐ(km). ᩗࡇ 6+ 65+ 54 3 2 1. 38q. 138q. 140.2. 20. 30. ૛㔡. 20. 30. ࿑ 20㩷 1962 ᐕ࿾㔡䈱઒ቯᢿጀ㕙䌛ᴡ㊁䊶ઁ䋨1993䋩䈮 ␜䈘䉏䈢૛㔡䈱㔡Ḯ䋨1962 ᐕ 5 ᦬ 6 ᣣ䈎䉌 16 ᣣ䋩䈍䉋䈶ᧄ㔡䈱䊜䉦䊆䉵䊛⸃䈮ട╩䌝. 142q. ࿑ 18㩷 ችၔ⋵ᄖ䈱᳇⽎ᐡ㔡ᐲ䊂䊷䉺䉕ㅊട䈚䈢㔡 ᐲಽᏓ䋨1962 ᐕ䈱࿾㔡䋩. Fig. 20 Fault model of the 1962 main shock assumed from epicenter distribution of its aftershocks [Kono et al. (1993)].. Fig. 18 Distribution map showing seismic intensity including JMA data outside of Miyagi prefecture of the 1962 event.. 38.8q. I=-2.92log(X)+1.24M+0.91 I+1.2 I-1.2 ܷ؉Ⴤϋ ܷ؉Ⴤ‫ٳ‬. 7 6 5. E. 4 Ҥ૾ᙱ. 3 38.6q. 2. 3 2 1 0. 1 0. 141.0q. 10. 100 ᩗเុᩉ (km). 1000. ࿑ 19㩷 1962 ᐕ䈱࿾㔡䈱㔡ᐲ䈱〒㔌ᷫ⴮䋨(4)ᑼ䈱 M6.5 䈱႐ว䋩 Fig. 19 Distance attenuation relationship of seismic intensity of the 1962 event. The solid line shows equation (4) of M=6.5.. 141.2q. ࿑ 21㩷 ૛㔡ಽᏓ[ᴡ㊁䊶ઁ(1993)]䈎䉌䈱ᗐቯᢿጀ㕙䈮䉋䉎䉣䊈䊦䉩䊷ಽᏓ䋨1962 ᐕ䈱࿾㔡䋺M6.5䋩‫ڏ‬䈲᳇ ⽎ᐡ䈮䉋䉎㔡ᄩ Fig. 21 Map showing energy distribution from seismic intensity inversion of the 1962 event (M6.5).. - 70 -.

(18) ⢻ᕈ䈏㜞䈇䈎䉌䈪䈅䉎䋮䉁䈢䋬⺋Ꮕ䈱ዊ䈘䈇㗔ၞ䈏ዊ ‐↰䉕᜽䉖䈪᧲⷏䈮ಽ㔌䈜䉎௑ะ䈏⷗䉌䉏䉎䈖䈫䉅 ห᭽䈭ේ࿃䈮䉋䉎䈫⠨䈋䉌䉏䉎䋮. ࿑ 22㩷䊙䉫䊆䉼䊠䊷䊄䈫⺋Ꮕ䋨1962 ᐕ࿾㔡䋩 Fig. 22 Errors of intensity of the 1962 event estimated by seismic intensity inversion analysis versus magnitude.. 4.3㩷 1900 ᐕ 5 ᦬ 12 ᣣ䈱࿾㔡 4.3.1㩷䉫䊥䉾䊄䉰䊷䉼䈮䉋䉎䊐䉤䊪䊷䊄⸃ᨆ䈮䉋䉎ᬌ⸛ (1) ᢿጀ䊝䊂䊦 1900 ᐕ䈱࿾㔡䈲ᢿጀ૏⟎䉇ᢿጀ䊝䊂䊦䈮㑐䈜䉎 ᣢሽ䈱⎇ⓥ䈏䈭䈇䋮䈠䈖䈪䋬น⢻ᕈ䈱䈅䉎ᢿጀ䊝䊂䊦䉕઒ቯ䈚䋬䈠䈱ᢿጀ䊝䊂䊦䈱ਛᔃᐳᮡ䉕᧲⚻ 140.8䌾141.4㫦䈍䉋䈶ർ✲ 38.3䌾38.9㫦䈱⍱ᒻ䈱▸ ࿐䈪 0.2 ᐲೞ䉂䈮േ䈎䈚䈩䋬䊐䉤䊪䊷䊄⸃ᨆ䉕➅䉍㄰ 䈚䈩⹏ଔ⺋Ꮕ䉕᳞䉄䉎䈫䈇䈉䉫䊥䉾䊄䉰䊷䉼䈪䇮ᦨㆡ䈭 ᢿጀ㕙૏⟎䉕ផቯ䈜䉎䋮⹏ଔ⺋Ꮕ䉕ᢿጀ䈱ਛᔃᐳ ᮡ䈮⟎䈐䋬䉮䊮䉺䊷䈪⴫␜䈜䉎䋮઒ቯ䈜䉎ᢿጀ㕙䈲એ ਅ䈱 2 ⒳㘃䈫䈚䋬M 䈲 6.2䌾6.5 䈪 0.1 ೞ䉂䈱 4 ⒳㘃䈫䈜䉎䋮 1) 2003 ᐕ࿾㔡ဳ䊝䊂䊦 ⴫ 3 䈮␜䈚䈢 2003 ᐕ䈱࿾㔡䈫ห䈛ᢿጀ㐳䈘䊶᏷䋬⿛ⴕ䋬௑䈐䋬ᷓ䈘䈱⍱ᒻ䈱ᢿጀ㕙䋮 2) ട⼔ဌ䋨䈎䈗䈿䈉䋩䋭◌ጪ䋨䈱䈱䈣䈔䋩ጊဳ䊝䊂䊦 2003 ᐕ䈱࿾㔡䈱ᦨᄢ૛㔡䈱䊜䉦䊆䉵䊛䈏ട⼔ ဌ䋭◌ጪጊᢿጀ䈱৻ㇱ䈮ㄭ䈇䈢䉄䋬Hikima and Koketsu(2004)䈱ᦨᄢ૛㔡䈱䊜䉦䊆䉵䊛⸃䉕↪䈇䈩⿛ⴕ N131°E䋬௑ᢳ 39°W 䈫䈚䈢䋮䉰䉟䉵䈲 2003 ᐕ 䈱࿾㔡䈫ห䈛 16km×10km 䈱⍱ᒻ䈫䈜䉎䋮ᷓ䈘䈲䋬 2003 ᐕ䈱࿾㔡䈱૛㔡䈱ᷓ䈘[Okada et al. (2003)] 䈮ว䉒䈞䈩䋬ᦨᵻㇱ䈏 5km䋬ᦨᷓㇱ䈏 11.3km 䈫䈜䉎䋮. (3) ർ✲ 38.25 એർ䈱㔡ᐲ䊂䊷䉺䈱䉂䈮䉋䉎⸃ᨆ 1900 ᐕ䈱࿾㔡䈱႐ว䋬࿑ 3 䈎䉌ಽ䈎䉎䉋䈉䈮㔡ᐲ 䊂䊷䉺䈏ችၔ⋵ౝ䈮㒢䉌䉏䋬ችၔ⋵ർㇱ䈮㔡ᐲ䈱ᄢ 䈐䈇㗔ၞ䈏䈅䉎䋮ጤᚻ⋵䈮䊂䊷䉺䈏䈭䈇䈖䈫䈎䉌䊂䊷䉺䈱ᐔ㕙⊛䈭䊋䊤䊮䉴䈏ᖡ䈒ධ䈮஍䉋䉎௑ะ䈏䈅䉎䋮 1962 ᐕ䈱࿾㔡䈱䉋䈉䈮ችၔ⋵એᄖ䈱䊂䊷䉺䉕ㅊട䈜䉎䈖䈫䈲⃻⁁䉃䈝䈎䈚䈇䈱䈪䋬ᐔ㕙⊛䈭䊋䊤䊮䉴䉕ᡷ ༀ䈜䉎䈢䉄䈮ർ✲ 38.25 ᐲએർ䈱䊂䊷䉺䈱䉂䉕↪䈇䈢⸃ᨆ䉕ⴕ䈉䋮࿑ 24 䈮⸃ᨆ⚿ᨐ䈱⺋ᏅಽᏓ䉕␜䈜䋮 2003 ᐕ࿾㔡ဳ䈍䉋䈶ട⼔ဌ䋭◌ጪጊဳ䈫䉅ዊ‐↰ 䈱ർ᧲䈮⺋Ꮕ䈏৻⇟ዊ䈘䈇࿾ὐ䈏䈅䉎䋮䊙䉫䊆䉼䊠䊷䊄䈏ᄢ䈐䈒䈭䉎䈫䋬⺋Ꮕ䈱ዊ䈘䈇㗔ၞ䈏ዊ‐↰䈱ධ ⷏஥䈮䉅↢䈛䋬䋲䈧䈱⺋Ꮕ䈱ዊ䈘䈇㗔ၞ䈏ዊ‐↰䈎䉌㔌䉏䈩䈇䈒䋮వ䈮ᜰ៰䈚䈢䉋䈉䈮䈖䈱䉋䈉䈭䉬䊷䉴䈲 ᬌ⸛ኻ⽎䈎䉌㒰ᄖ䈜䉎䋮 (4) 㔡ᐲ 5 ᒙએ਄䈱㔡ᐲ䊂䊷䉺䈱䉂䈮䉋䉎⸃ᨆ వ䈮ㅀ䈼䈢䉋䈉䈮㔡ᐲ䊂䊷䉺䈏ችၔ⋵ౝ䈮㒢䉌䉏䈩䈍䉍䋬䈠䈱ᗧ๧䈪㔡ᐲ 4 એਅ䈱䊂䊷䉺䈱ో䈩䈏⹏ ଔ䈘䉏䈩䈇䉎䈫䈇䈉଻㓚䈏䈭䈇䈖䈫䋬䉁䈢䋬ⵍኂ䈱⒟ᐲ 䈎䉌㔡ᐲ䉕⹏ଔ䈚䈩䈇䉎䈢䉄䈮ⵍኂ䈏䈅䉁䉍↢䈛䈭䈇㔡ᐲ 4 એਅ䈱䊂䊷䉺䈱ା㗬ᕈ䈲䋬㔡ᐲ 5 ᒙએ਄䈮Ყ 䈼䈩䉇䉇ૐ䈇䈫⠨䈋䉌䉏䉎䋮䈠䈖䈪䋬㔡ᐲ 5 ᒙએ਄䈱㔡ᐲ䊂䊷䉺䈱䉂䈪⸃ᨆ䉕ⴕ䈉႐ว䉅⠨䈋䉎䋮࿑ 25 䈮⺋ᏅಽᏓ䉕␜䈜䋮2003 ᐕ࿾㔡ဳ䈍䉋䈶ട⼔ဌ䋭◌ ጪጊဳ䈫䉅ዊ‐↰䈱ർ᧲䈮⺋Ꮕ䈏৻⇟ዊ䈘䈇࿾ὐ䈏 ᳞䉄䉌䉏䋬ർ✲ 38.25 ᐲએർ䈱㔡ᐲ䊂䊷䉺䈱䉂䈱⸃ ᨆ䈫ห䈛䉋䈉䈭⚿ᨐ䈫䈭䈦䈢䋮 38.8q. 38.6q. 38.8q. 38.6q. 38.6q. ‫ݱ‬ཅဋ 0.749 38.4q. 140.8q. (2) ో㔡ᐲ䊂䊷䉺䈮䉋䉎⸃ᨆ 䉁䈝䋬࿑ 3 䈮␜䈚䈢ችၔ⋵ౝ䈜䈼䈩䈱㔡ᐲ䊂䊷䉺䉕↪䈇䈩⸃ᨆ䉕ⴕ䈉䋮࿑ 23 䈮⹏ଔ⺋Ꮕ䈱ಽᏓ䉕␜䈜䋮 ᦨዊ⺋Ꮕ࿾ὐ䈲䋬2003 ᐕ࿾㔡ဳ䈍䉋䈶ട⼔ဌ䋭◌ ጪጊဳ䈫䉅䈮㔡ᐲ䈏৻⇟ᄢ䈐䈎䈦䈢ዊ‐↰䉋䉍 15km ೨ᓟධධ⷏ᣇะ䈮㔌䉏䈩䈇䉎䋮䈖䈱㗔ၞ䈲䋬㐳↸ ೑ᐭ✢ᢿጀ䉕ർ᧲ㇱ䈮ᑧ䈳䈚䈢㗔ၞ䈮ኻᔕ䈚䋬M 䈲 6.4 䈫䈭䉎䋮2003 ᐕ࿾㔡ဳ䈱ᣇ䈏⧯ᐓ⺋Ꮕ䈲ዊ䈘䈇䋮䊙䉫䊆䉼䊠䊷䊄䉕ᄢ䈐䈒઒ቯ䈜䉎䈫䋬⺋Ꮕ䈱ዊ䈘䈇㗔 ၞ䈏㔡ᐲ䈱䊂䊷䉺䈱䈭䈇⷏䈮⒖േ䈜䉎௑ะ䈏䈅䉎䋮䈖䈱䉋䈉䈭႐ว䈮䈲ᵈᗧ䈏ᔅⷐ䈪䈅䉎䋮㔡ᐲ䊂䊷䉺䈱 ಽᏓ䈏஍࿷䈚䈩䈇䉎ᓇ㗀䈏⸃ᨆ⚿ᨐ䈮⃻䉏䈩䈇䉎น. 38.8q. 0.757 141.0q. 0.754. 38.4q. 141.2q. M6.3. 38.4q. 141.4q140.8q. 141.0q. 141.2q. M6.4. 141.4q140.8q. 141.0q. 38.8q. 38.8q. 38.8q. 38.6q. 38.6q. 38.6q. 141.2q. M6.5. (a)‫ޓ‬2003ᐕ࿾㔡ဳ. 141.4q. 1.00 0.90 0.80 0.70. 0.786 38.4q. 140.8q. 0.771. 0.775. 0.60 38.4q. 38.4q. 141.0q. 141.2q. M6.3. 141.4q 140.8q. 141.0q. 141.2q. M6.4. 141.4q140.8q. 141.0q. 141.2q. M6.5. 141.4q. (b)‫ޓ‬ട⼔ဌጊ㧙◌ጪጊဳ ࿑23㩷 1900 ᐕ࿾㔡䈱䉫䊥䉾䊄䉰䊷䉼䈮䉋䉎⺋ᏅಽᏓ䋨ో㔡ᐲ䊂䊷䉺䋬‫ڏ‬䋺ᦨዊ⺋Ꮕ࿾ὐ䋬ᢙሼ䈲ᦨዊ⺋Ꮕ䋩 Fig. 23 Contour map of error estimated by grid search method of the 1900 event using all intensity data.. - 71 -.

(19) ⴫ 4㩷 1900 ᐕ࿾㔡䈱⸃ᨆ䉬䊷䉴䈫᧦ઙ 38.8q. 38.8q. 38.8q. 0.766. 38.6q. 0.782. 38.6q. 140.8q. 0.796. 141.2q. M6.2. 38.8q. 141.4q140.8q. 1. 38.4q. 38.4q. 141.0q. ࠤ࡯ ࠬ. 38.6q. ‫ݱ‬ཅဋ 38.4q. Table 4 Cases and their assumption of inversion analysis for the 1900 event.. 141.0q. 141.2q. M6.3. 141.4q140.8q. (a)‫ޓ‬2003ᐕ࿾㔡ဳ 38.8q. 141.0q. 141.2q. M6.4. 141.4q. 2. 1.00 0.90. 38.8q. 3. 0.80. 0.805. 38.6q. 0.820. 38.6q. 0.828. 140.8q. 141.2q. M6.2. 141.4q 140.8q. 141.0q. 141.2q. M6.3. 141.4q140.8q. 141.0q. 141.2q. M6.4. Fig. 24 Contour map of error estimated by grid search method of the 1900 event using intensity data north of 38.25 䍽 latitude.. 38.6q. 38.8q. 0.769. 38.8q. 0.708. 0.731 38.6q. 38.6q. 38.4q. 38.4q. ‫ݱ‬ཅဋ 38.4q. 140.8q. 141.0q. 141.2q. M6.2. 38.8q. 141.4q140.8q. 141.0q. 141.2q. M6.3. 141.0q. 141.2q. M6.4. 141.4q. 1.00 0.90. 38.8q. 0.748. 0.778 38.6q. 141.4q140.8q. (a)‫ޓ‬2003ᐕ࿾㔡ဳ 38.8q. 38.6q. 㔡ᐲ࠺࡯࠲ ోㇱ ർ✲ 38.25 ᐲએർ 㔡ᐲ 5 ᒙએ ਄. ട⼔ဌ㧙 ◌ጪጊဳ. ട⼔ဌ㧙◌ጪጊ 㔡ᐲ 5 ᒙએ ᢿጀߩ૏⟎ ਄. 141.4q. (b)‫ޓ‬ട⼔ဌጊ㧙◌ጪጊဳ ࿑24㩷 1900ᐕ࿾㔡䈱䉫䊥䉾䊄䉰䊷䉼䈮䉋䉎⺋ᏅಽᏓ䋨ർ✲38.25 ᐲએർ䈱㔡ᐲ䊂䊷䉺䋬‫ڏ‬䋺ᦨዊ⺋Ꮕ࿾ὐ䋬ᢙሼ䈲ᦨዊ⺋Ꮕ䋩. 38.8q. 4. 0.60. 38.4q. 38.4q. 141.0q. ᢿጀ㕙 ૏⟎ M6.4 ߩ⺋Ꮕᦨ ዊ࿾ὐ M6.2 ߩ⺋Ꮕᦨ ዊ࿾ὐ M6.3 ߩ⺋Ꮕᦨ ዊ࿾ὐ. 38.6q. 0.70. 38.4q. ᒻ⁁ 2003 ᐕ ࿾㔡ဳ 2003 ᐕ ࿾㔡ဳ 2003 ᐕ ࿾㔡ဳ. 䈠䉏䈡䉏ኻᔕ䈜䉎䉬䊷䉴䈱㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ ᨆ䈮䉋䉎䉣䊈䊦䉩䊷ಽᏓ䉕࿑ 26 䈮䋬䊙䉫䊆䉼䊠䊷䊄䈫⺋Ꮕ䈱㑐ଥ䉕࿑ 27 䈮䈠䉏䈡䉏␜䈜䋮䈭䈍䋬㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈮䈲⴫ 4 䈮␜䈜㔡ᐲ䊂䊷䉺䉕䈠䉏䈡䉏䈱⸃ᨆ䉬䊷䉴䈪↪䈇䈩䈇䉎䈏䋬࿑ 27 䈮␜䈜⺋Ꮕ䈲䋬 ⛘ኻ୯䉕䉬䊷䉴㑆䈪Ყセ䈜䉎䈢䉄䈮ർ✲ 38.25 ᐲએ ർ䈎䈧㔡ᐲ 5 ᒙએ਄䈱ห䈛䊂䊷䉺䈪⹏ଔ䈚䈩䈇䉎䋮䉁䈢䋬࿑ 26 䈮␜䈜㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈱䈠䉏䈡䉏䈱⚿ᨐ䈲⺋Ꮕᦨዊ䈱䊙䉫䊆䉼䊠䊷䊄䈱႐ว䉕␜䈚䈩䈇䉎䋮䉬䊷䉴 4 䈲⺋Ꮕ䈏ᄢ䈐䈒ឃ㒰䈪䈐䉎䈏䋬䈠䈱 ઁ䈲⺋Ꮕ䈮᦭ᗧ䈭Ꮕ䈏䈭䈒䋬䈖䈱⚿ᨐ䈣䈔䈎䉌䈲䈬䈱䊝䊂䊦䈏ᦨㆡ䈎್ᢿ䈪䈐䈭䈇䋮⺋Ꮕᦨዊ䈫䈭䉎䊙䉫䊆䉼䊠䊷䊄䈲 M6.3 䈎䉌 M6.5 䈱▸࿐䈮䈅䉎䈖䈫䈏ಽ䈎䉎䋮. 0.80. 0.724. (a)ǱȸǹᲫ(M6.4). (b)ǱȸǹᲬ(M6.4). 38.6q. 0.70 0.60 38.4q. 140.8q. 38.4q. 141.0q. 141.2q. M6.2. 141.4q 140.8q. 38.4q. 141.0q. 141.2q. M6.3. 141.4q140.8q. 141.0q. 141.2q. M6.4. 38.6q. 38.6q. ‫ݱ‬ཅဋ. 141.4q. (b)‫ޓ‬ട⼔ဌጊ㧙◌ጪጊဳ ࿑ 25㩷 1900 ᐕ࿾㔡䈱䉫䊥䉾䊄䉰䊷䉼䈮䉋䉎⺋ᏅಽᏓ䋨㔡ᐲ䋵ᒙ એ਄䈱㔡ᐲ䊂䊷䉺䋬‫ڏ‬䋺ᦨዊ⺋Ꮕ࿾ὐ䋬ᢙሼ䈲ᦨዊ⺋Ꮕ䋩. 38.4q. Fig. 25 Contour map of error estimated by grid search method of the 1900 event using intensity data of 5 lower and more.. 141.0q. 10km 141.2q. (c)ǱȸǹᲭ(M6.5). 4.3.2㩷㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈮䉋䉎ᬌ⸛ 䉫䊥䉾䊄䉰䊷䉼䈱⚿ᨐ䉕ෳ⠨䈮⴫ 4 䈮␜䈜 4 ⒳㘃䈱 ᢿጀ㕙䉕⸳ቯ䈚䈩䋬䊙䉫䊆䉼䊠䊷䊄䉕 0.1 ೞ䉂䈪ᄌ䈋䈩㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䉕ⴕ䈉䋮ട⼔ဌ䋭◌ጪጊဳ 䈮䈧䈇䈩䈲 2003 ᐕ࿾㔡ဳ䈫Ყ䈼䈩௑ะ䈮ᄢ䈐䈭Ꮕ 䈲䈭䈇䈏䋬⺋Ꮕ䈏ᄢ䈐䉄䈭䈱䈪䋬ታ㓙䈮ᢿጀ䈏䈅䉎 ႐ᚲ䈱䉂䈪⸃ᨆ䈜䉎䋮4.3.1 䈪⼏⺰䈚䈢䉋䈉䈮䉫䊥䉾䊄䉰䊷䉼䈪 M 䈏ᄢ䈐䈒ᢿጀ㕙䈏㔡ᐲ䊂䊷䉺ಽᏓ䈱┵䈮 ᳞䉄䉌䉏䉎䉬䊷䉴䈲ᔅ䈝䈚䉅ᦨㆡ䈭⸃䈫䈲䈇䈋䈭䈇䈱䈪䋬䉬䊷䉴 3 䈮䈧䈇䈩䈲 M6.3 䈱⺋Ꮕᦨዊ䈱ᢿጀ㕙䉕 ណ↪䈚䈢䋮. E 38.4q 3 2 1 0 141.4q. 141.0q. (d)ǱȸǹᲮ(M6.3). 38.6q. 38.6q. 38.4q. E 38.4q 3 2 1 0 141.4q. 141.0q. 10km 141.2q. 10km 141.2q. E 3 2 1 0 141.4q. ьᜱ‫ޛש‬ ሸީ‫ޖૺޛ‬. 141.0q. 10km 141.2q. E 3 2 1 0 141.4q. ࿑ 26㩷㔡ᐲ䉟䊮䊋䊷䉳䊢䊮䈮䉋䉎䉣䊈䊦䉩䊷ಽᏓ 䋨1900 ᐕ࿾㔡䋩 Fig. 26 Map showing energy distribution from seismic intensity inversion of the 1900 event.. - 72 -.

(20) ࿑ 27㩷 1900 ᐕ࿾㔡䈱䊙䉫䊆䉼䊠䊷䊄䈫㔡ᐲ⹏ଔ⺋Ꮕ 䋨ർ✲ 38.25 ᐲએർ䈎䈧㔡ᐲ 5 ᒙએ਄䈱䊂䊷䉺䈱䉂䋩 Fig. 27 Errors of intensity of the 1900 event estimated by seismic intensity inversion analysis versus magnitude.. 4.4㩷 ችၔ⋵ർㇱ䈱࿾㔡䈮䈧䈇䈩䈱⠨ኤ 㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈱⚿ᨐ䋬⺋Ꮕ䈏ᦨዊ䈮䈭䉎䊙䉫䊆䉼䊠䊷䊄䉕ផቯ䊙䉫䊆䉼䊠䊷䊄䈫䈚䈩⴫ 5 䈮 ␜ 䈜䋮 2003 ᐕ 䈱 ࿾ 㔡䈲䋬 ⵍ ኂ 䈎䉌 ផ ቯ 䈚䈢 ᱞ ᧛ (2005b)䈱㔡ᐲ䉕↪䈇䉎䈫 M6.3 䈪䋬⸘᷹㔡ᐲ䉕↪䈇䉎䈫᳇⽎ᐡ⊒⴫䈱䊙䉫䊆䉼䊠䊷䊄䈫ห䈛 M6.4 䈫䈭䉎䋮ේ ࿃䈫䈚䈩䈲䋬⍴๟ᦼ࿾㔡േ䈏ථ⿧䈚䈢䈖䈫䈮䉋䉍䋬ታ 㓙䈱ⵍኂ䉇૕ᗵ䈮䉋䉎㔡ᐲ䉋䉍⸘᷹㔡ᐲ䈏䉇䉇ᄢ䈐䉄䈮䈭䈦䈢䈢䉄䈫⠨䈋䉌䉏䉎䈏᦭ᗧ䈭Ꮕ䈫䈲⸒䈋䈭䈇䋮㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈱⚿ᨐ䋬3 䈧䈱ችၔ⋵ർㇱ䈱࿾㔡䈲䋬M6.4 ೨ᓟ䈪࿾㔡ⷙᮨ䈏ห⒟ᐲ䈪䈅䈦䈢䈫 ⠨䈋䉌䉏䉎䋮䉫䊥䉾䊄䊥䉰䊷䉼䈱⚿ᨐ䉕〯䉁䈋䈩㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈮↪䈇䈢ᢿጀ㕙䈱䊝䊂䊦䉕ᦨㄭ䈱࿾㔡䈱૛ 㔡ಽᏓ䉇ᷓ䈘 24km 䈮䈍䈔䉎 S ᵄㅦᐲ஍ᏅಽᏓ䈱࿑ [ጟ↰䊶ઁ(2008)]䈫㊀䈰ว䉒䈞䈩࿑ 28 䈮␜䈜䋮㕍⦡ 㗔ၞ䈏㜞ㅦᐲၞ䈪䋬⿒⦡䈱㗔ၞ䈏ૐㅦᐲၞ䈮ኻᔕ 䈚䈩䈇䉎䋮⊕ታ✢䈱⍱ᒻ䈏⸃ᨆᢿጀ㕙䈪䈅䉎䋮1900 ᐕ䈱࿾㔡䈲ർ✲ 38.25 ᐲએർ䈱㔡ᐲ䊂䊷䉺䉕↪䈇䈢䉬䊷䉴 2 䈱ᢿጀ㕙䉕␜䈚䈩䈇䉎䋮㔡ᐲ 5 ᒙએ਄䈱䊂䊷䉺䉕↪䈇䈢䉬䊷䉴 3 䈱૏⟎䉅䈾䈿ห䈛䈪䈅䉎䋮࿑䈮䈲ὐታ✢䈱⍱ᒻ䈪ో䊂䊷䉺䉕↪䈇䈢႐ว䈱ᢿጀ૏ ⟎䉅␜䈜䈏䋬࿾㔡⊒↢ጀ䉋䉍䉇䉇ᷓ䈇ጀ䈱ૐㅦᐲၞ 䈲ᱡ㓸ਛᏪ䈮ኻᔕ䈚ౝ㒽࿾Ზౝ࿾㔡䈏⊒↢䈜䉎䈫䈇䈉┙႐[ጟ↰䊶ઁ(2008)]䈮┙䈩䈳䋬䉬䊷䉴 2 䉇 3 䈱 ᣇ䈏႐ᚲ䈫䈚䈩䉋䉍ㆡಾ䈪䈅䉎䈫್ᢿ䈘䉏䉎䋮䈠䈱႐ ว 1900 ᐕ䈱࿾㔡䈱㔡Ḯ䈲 1962 ᐕ䈫 2003 ᐕ䈱࿾㔡䈱㔡Ḯ䈱㑆䉕ၒ䉄䉎䉋䈉䈭૏⟎䈮䈅䉎䈖䈫䈏ಽ䈎䉎䋮 ⴫ 5㩷 ችၔ⋵ർㇱ䈱࿾㔡䈱ផቯ䊙䉫䊆䉼䊠䊷䊄 Table 5 Estimated magnitude of Northern Miyagi earthquakes. ࿾㔡⊒↢ᐕ 2003 1962 1900. ផቯ䊙䉫䊆䉼䊠䊷䊄 M 6.3䌾6.4 6.5 6.3䌾6.5. ࿑ 28㩷 ᦨㄭ䈱࿾㔡䈱㔡ᄩಽᏓ䈫ផቯ䈘䉏䈢࿾㔡ᢿ ጀ㕙. ᧲ർᄢቇᄢቇ㒮ℂቇ⎇ⓥ⑼䋭࿾㔡䊶ྃἫ੍⍮⎇ⓥ᷹ⷰ䉶䊮䉺䊷䈱 HP(2008)䈮ട╩䋮⢛ᓟ䈱Ớ᷆䈲ᷓ䈘 24km 䈮䈍䈔䉎 S ᵄㅦᐲ஍Ꮕ(ጟ ↰䊶ઁ䋬2008)䋮㤥ὐ䈭䈬䈲ᦨㄭ䈱࿾㔡䈱㔡ᄩ䉕␜䈜䋮E2 䈲 1962 ᐕች ၔ⋵ർㇱ࿾㔡䈱૛㔡ၞ䋬E3 䈲 2003 ᐕችၔ⋵ർㇱ࿾㔡䋨M6.4䋩䈱૛ 㔡ၞ䋮. Fig. 28 Fault models inferred from this study superimposed on map showing recent earthquake epicenters and S-wave velocity perturbation at a depth of 24km.. §5. 䉁䈫䉄㔡ᐲ䈱〒㔌ᷫ⴮․ᕈ䉇᷹ⷰ࿾ὐ䈱ំ䉏ᤃ䈘䈱ಽ ᨆ䉕ⴕ䈦䈢਄䈪䋬ችၔ⋵ർㇱ䈪⊒↢䈚䈢 2003 ᐕ䋬 1962 ᐕ䈍䉋䈶 1900 ᐕ䈱ౝ㒽࿾㔡䈱㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈭䈬䉕ⴕ䈦䈩࿾㔡ᢿጀ䈍䉋䈶࿾㔡ⷙᮨ䈮䈧䈇䈩ᬌ⸛䉕ⴕ䈦䈢䋮ᓧ䉌䉏䈢⚿⺰䉕䉁䈫䉄䉎䈫એਅ䈱 ㅢ䉍䈪䈅䉎䋮 (1) 2003 ᐕ䈱࿾㔡䈱⍴๟ᦼ࿾㔡ᵄ⊒↢ၞ䈲䋬ᢿጀ 䈱ർㇱ䈮ᓧ䉌䉏䈢䋮䈖䉏䈲䋬ධ䈎䉌ർ䈮⎕უ䈏 ㅴ䉖䈣䈫䈜䉎䈫ᢿጀਛᄩ䈮䈅䉎䈜䈼䉍䈱ᄢ䈐䈇䉝䉴䊕䊥䊁䉞䈱⚳┵ㇱ䈮૏⟎䈜䉎䋮䈖䉏䈲䋬ᱞ᧛䊶 ␹↰(2008)䈱ᜰ៰䈜䉎䊒䊧䊷䊃Ⴚ⇇࿾㔡䈱⍴๟ ᦼ࿾㔡ᵄ⊒↢ၞ䈱․ᕈ䈫ᢛว䈜䉎䋮 (2) 1962 ᐕ䈱࿾㔡䈲䋬㔡ᐲ䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈮䉋䉎⍴๟ᦼ࿾㔡ᵄ⊒↢ၞ䈲ᢿጀ⷏஥䈮䈅䉍䋬ᦨㆡ M 䈲 6.5 䈫᳞䉄䉌䉏᳇⽎ᐡ䊙䉫䊆䉼䊠䊷䊄䈫৻⥌ 䈚䈢䋮 (3) 1900 ᐕ䈱࿾㔡䈲䋬ችၔ⋵䈱ో㔡ᐲ䊂䊷䉺䈪⸃ ᨆ䈜䉎䈫䋬⺋Ꮕᦨዊ䈱ᢿጀ㕙䈲㔡ᐲ䈏৻⇟ᄢ䈐䈇ዊ‐↰䈱ධ஥䈮૏⟎䈚䈢䋨䉬䊷䉴 1䋩䋮৻ᣇ䋬 ർ✲ 38.25 ᐲએർ䈱㔡ᐲ䊂䊷䉺䉇㔡ᐲ 5 ᒙએ਄ 䈱㔡ᐲ䊂䊷䉺䉕↪䈇䉎䈫ዊ‐↰䈱ർ᧲䈮૏⟎䈜䉎⚿ᨐ䈫䈭䈦䈢䋨䉬䊷䉴 2,3䋩䋮䈖䈱૏⟎䈲 2003 ᐕ 䈱࿾㔡䈫 1962 ᐕ䈱࿾㔡䈱ᢿጀ㕙䈱㑆䈮૏⟎䈚䋬 ᱡ㓸ਛᏪ䈫⠨䈋䉌䉏䉎ᷓ䈘 24km 䈱 S ᵄㅦᐲ䈱. - 73 -.

(21) in near field, Tectonophysics. 218, 69-81. Okada, T., N. Umino and A. Hasegawa, 2003, Rupture process of the July 2003 northern Miyagi earthquake sequence, NE Japan, estimated from double-difference hypocenter locations, Earth Planets Space, 55, 741-750. ጟ↰⍮Ꮖ, ၳୃ৻㇢, ᴡ㊁ବᄦ, ਛጊ⾆ผ, ᐔේ⡡, ᣂዬᕶᐔ, A. Omuralieva, ਛፉᷕ৻, ᶏ㊁ᓼੳ, 㐳⼱Ꮉᤘ, 2008, ᧲ർ࿾ᣇਛᄩㇱ߅ࠃ߮ߘߩ๟ ㄝߩ࿾Ზౝ࿾㔡ᵄㅦᐲਇဋ⾰᭴ㅧߣ࿾㔡ᵴേ, 2008 ᐕ ࿾ ⃿ ᖺ ᤊ ⑼ ቇ 㑐 ㅪ ቇ ળ ㅪ ว ᄢ ળ , S147-S008. Smith, W. H. F, and P. Wessel, 1990, Gridding with ⻢ㄉ continuous curvature splines in tension, Geophysics, ᧲ർᄢቇ䈱ᶏ㊁ᓼੳ᳁䈍䉋䈶᧲ർ㔚ജ䈱ᯅᧄୃ 55, 293-305. ৻᳁䈮䈲⾆㊀䈭䉮䊜䊮䊃䉕㗂䈐䉁䈚䈢䋮䉁䈢䋬ᩏ⺒䈚䈩 ᱞ᧛㓷ਯ㧘2005a㧘1900 ᐕችၔ⋵ർㇱ࿾㔡ߩࡑࠣ 䈇䈢䈣䈇䈢⍹ᯅసᒾ᳁䈍䉋䈶ᬀ┻ን৻᳁䈮䈲ᭂ䉄䈩 ࠾࠴ࡘ࡯࠼ߣ㔡Ḯ૏⟎ߩౣ⹏ଔ㧙1962 ᐕ߅ࠃ ᦭⋉䈭䈗ᗧ⷗䉕㗂䈐䋬ᧄ⺰ᢥ䈱ᡷༀ䈮㕖Ᏹ䈮ᓎ┙䈤 ߮ 2003 ᐕߩ࿾㔡ߣߩ㑐ㅪᕈ㧘࿾㔡 2㧘58, 41-53. 䉁䈚䈢䋮䈖䈖䈮⸥䈚䈩ᷓ䈒ᗵ⻢䈱ᗧ䉕⴫䈚䉁䈜䋮 ᱞ᧛㓷ਯ, 2005b, 1900 ᐕ߅ࠃ߮ 1962 ᐕችၔ⋵ർㇱ ࿾㔡ߩⵍኂ࠺࡯࠲ߣ㔡ᐲಽᏓ㧘ᱧผ࿾㔡, 20, ኻ⽎࿾㔡䋺 1900 ᐕችၔ⋵ർㇱ䋬1962 ᐕችၔ⋵ർㇱ䋬 201-221. 2003 ᐕችၔ⋵ർㇱ䈱࿾㔡 ᱞ᧛㓷ਯ࡮␹↰సਭ, 2008, 㔡ᐲ࠺࡯࠲ߦࠃࠆ⍴๟ ᦼ࿾㔡ᵄߩ㔡Ḯផቯ, ᱧผ࿾㔡, 23, 7-19. ᢥ ₂ ᧲ർᄢቇᄢቇ㒮ℂቇ⎇ⓥ⑼㧙࿾㔡࡮ྃἫ੍⍮⎇ⓥ ᷹ⷰ࠮ࡦ࠲࡯, 2008, 2008 ᐕ 6 ᦬ 14 ᣣ ጤᚻ࡮ች ᵿ᧻㖸⬿࡮ቝ૒⟤㦖ᄦ, 1985, ᣣᧄߩ࿾㔡㔡ᐲ⺞ᩏ ၔౝ㒽࿾㔡㧔M7.2㧕ߩ․㓸, ⴫ I-VI(1885-1984), ᧲੩ᄢቇ࿾㔡⎇ⓥᚲ, 866pp. (http://www.aob.geophys.tohoku.ac.jp/info/topics Hikima, K. and K. Koketsu, 2004, Source process of /20080614_news/) the foreshock, mainshock and largest aftershock in Umino, N., T. Okada, J. Nakajima, S. Hori, T. Kono, T. the 2003 Miyagi-ken Hokubu, Japan, earthquake Nakayama, N. Uchida, J. Shimizu, J. Suganomata, sequence, Earth Planets Space, 56, 87-93. S. S. N. Gamage, A. Hasegawa, and Y. Asano, 2003, ␹↰సਭ࡮ᱞ᧛㓷ਯ࡮ቝ૒⟤㦖ᄦ, 2003, 㔡ᐲ࠺࡯ hypocenter and focal mechanism distributions of ࠲ࠍ↪޿ߚ㔡Ḯᢿጀ߆ࠄߩࠛࡀ࡞ࠡ࡯᡼಴ಽᏓ aftershocks of July 26 2003 M6.4 northern Miyagi, NE Japan, earthquake revealed by temporary ߩࠗࡦࡃ࡯࡚ࠫࡦ⸃ᨆ, ࿾㔡 2, 56, 39-58. seismic observation, Earth Planets Space, 55, ᳇⽎ᐡ, 2009, ࿾㔡ᐕႎ(ᐔᚑ 19 ᐕ), ᳇⽎ᬺോᡰេ 719-730. ࠮ࡦ࠲࡯, DVD. ቝ૒⟤㦖ᄦ, 2003, ᦨᣂ 㧦ᣣᧄⵍኂ࿾㔡ⵍኂ✚ⷩ ᴡ㊁ବᄦ࡮ੳ↰੤Ꮢ࡮᧻ᧄ⡡࡮ၳౝ⨃ᧁ࡮ጟ↰⍮ [416]-2001, ᧲ᄢ಴ ળ, 605pp. Ꮖ࡮㐿ේ⾆⟤࡮㐳⼱Ꮉᤘ࡮ၳୃ৻㇢࡮ᶏ㊁ᓼੳ࡮ ቝᵤᓼᴦ, 1979, 1885 ᐕ㨪1925 ᐕߩᣣᧄߩ࿾㔡ᵴ ㋈ᧁ዁ਯ㧘1993㧘1962 ᐕችၔ⋵ർㇱ࿾㔡(M6.5) േ㧙M6 એ਄ߩ࿾㔡߅ࠃ߮ⵍኂ࿾㔡ߩౣ⺞ᩏ, 㔡Ḯၞߦ߅ߌࠆᓸዊ࿾㔡ᵴേ㧘࿾㔡 2㧘46, 85-93. ࿾㔡⎇ⓥᚲᒵႎ, 54, 253-308. ⠑Ꮉਃ㇢࡮⮮ᧄ৻㓶࡮᧛᧻㇚ᩕ, 1996, ⸘᷹㔡ᐲߣ ⧯᧻ടኼᳯ࡮ਭ଻⚐ሶ࡮᧻ጟ᣽ᔒ࡮㐳⼱Ꮉᶈ৻࡮ ᣥ᳇⽎ᐡ㔡ᐲ߅ࠃ߮࿾㔡േᒝߐߩᜰᮡߣߩ㑐ଥ, ᧖ᶆᱜ⟤, 2005, ᣣᧄߩ࿾ᒻ࡮࿾⋚࠺ࠫ࠲࡞ࡑ ࿾ၞ቟ోቇળ⺰ᢥ㓸, Vol.1, 51-56 ࠶ࡊ, ᧲੩ᄢቇ಴ ળ, 104pp. ᧛᧻㇚ᩕ, 1996, ᳇⽎ᐡߩ⸘᷹㔡ᐲߦߟ޿ߡ, ࿾ 㔡Ꮏቇᝄ⥝ળ࠾ࡘ࡯ࠬ, No.150, 27-35. Nishimura, T., T. Imakiire, H. Yarai, T. Ozawa, M. Murakami and M. Kaidzu, 2003, A preliminary fault model of the 2003 July 26, M6.4 northern Miyagi earthquake, northeastern Japan, estimated from joint inversion of GPS, leveling, and InSAR data, Earth Planets Space, 55, 751-757. Ohno, S., T. Ohta, T. Ikeura and M. Takemura, 1993, Revision of attenuation formula considering the effect of fault size to evaluate strong motion spectra ૐㅦᐲၞ䈮ኻᔕ䈚䈩䈍䉍䋬ో㔡ᐲ䊂䊷䉺䉕↪䈇䈢႐ว䈱䉬䊷䉴 1 䉋䉍䉅น⢻ᕈ䈏㜞䈇䈫⠨䈋䉌䉏䉎䋮 (4) ችၔ⋵ർㇱ䈱 3 䈧䈱࿾㔡䈱࿾㔡ᢿጀ䈲䋬࿾㔡 ⊒↢ጀ䉋䉍䉇䉇ᷓ䈇㗔ၞ䈱ૐㅦᐲၞ䉕ၒ䉄䉎䉋䈉䈮ኻᔕ䈜䉎૏⟎䈪⊒↢䈚䈩䈐䈢䈫⠨䈋䉌䉏䉎䋮䈖䈱ὐ䈲ᱞ᧛䋨2005a䋩䈱⚿ᨐ䉕ᡰᜬ䈜䉎䋮㔡ᐲ 䉟䊮䊋䊷䉳䊢䊮⸃ᨆ䈮䉋䉎 3 䈧䈱࿾㔡䈱ᦨㆡ䊙䉫䊆䉼䊠䊷䊄䈲䋬หⷙᮨ䈪 M6.3䌾6.5 䈫ផቯ䈘䉏䈢䋮. - 74 -.

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