東北地域災害科学研究

185

第55巻（2019）ᒾᡭ኱Ꮫ࡛ほࡉࢀࡓ▷࿘ᮇᚤືࡢᆅ㟈Ἴᖸ΅ἲゎᯒ࡟ࡼࡿ
⩌㏿ᗘࡢ᥎ᐃ㸨             ᒾᡭ኱ᏛᕤᏛ㒊 బࠎᮌᜨኴᒾᡭ኱Ꮫ⌮ᕤᏛ㒊 ᒣᮏⱥ࿴ 㰺⸨๛㸯㸬ࡣࡌࡵ࡟ᆅ㟈᫬ࡢᦂࢀࡸࡍࡉࢆホ౯ࡍࡿࡓࡵ࡟㸪ᆅ┙ࡢ S Ἴ㏿ᗘᵓ㐀ࢆᢕᥱࡍࡿࡇ࡜ࡀ㔜せ࡛࠶ࡿࠋࡇࢀࡽࡢ᥈ᰝ࡟ࡣ㸪ᚤື࢔ࣞ࢖᥈ᰝࡀࡼࡃ⏝࠸ࡽࢀࡿࠋᚤື࢔ࣞ࢖᥈ᰝ࡜ࡣ㸪⾲㠃Ἴࡢ఩┦㏿ᗘ࡟ࡳࡽࢀࡿศᩓᛶ ఩┦㏿ᗘࡀ࿘Ἴᩘ࡟ࡼࡗ࡚ኚ໬ࡍࡿ࡜࠸࠺ᛶ㉁ ࢆ฼⏝ࡋ࡚㸪୺࡟ᆅୗࡢ S Ἴ㏿ᗘᵓ㐀ࢆ᥎ᐃࡍࡿᡭἲ(౛࠼ࡤ Okada㸪2003)࡛࠶ࡿࠋࡋ࠿ࡋ㸪ࡇࡢᡭἲ࡛ࡣ㸪㏫ゎᯒ➼࡛ゎࡀ 1 ࡘ࡟ồࡲࡽ࡞࠸ྍ⬟ᛶࡀ࠶ࡿࠋࡼࡗ࡚㸪ࡼࡾከࡃࡢᆅୗᵓ㐀ࡢ᝟ሗࡀ࠶ࡿࡇ࡜ࡀᮃࡲࡋ࠸ࠋࡑࡇ࡛㸪᭱㏆࡛ࡣ㸪ูࡢᡭἲ࡛࠶ࡿᆅ㟈Ἴᖸ΅ἲࡀᥦ᱌ࡉࢀ࡚࠸ࡿࠋࡇࢀࡣ㸪2 ほⅬ࡟࠾ࡅࡿἼືሙࡢ┦஫┦㛵㛵ᩘࢆ㛗᫬㛫㔜ྜࡍࡿࡇ࡜࡟ࡼࡗ࡚㸪1 Ⅼࢆ㟈※࡜ࡋ㸪ࡶ࠺ 1 Ⅼࢆほ Ⅼ࡜ࡍࡿࢢ࣮ࣜࣥ㛵ᩘ ࢖ࣥࣃࣝࢫᛂ⟅ ࢆồࡵࡿᡭἲ࡛࠶ࡿ(୰ཎ2015)ࠋࡇࡢᆅ㟈Ἴᖸ΅ἲࢆ⏝࠸࡚㸪⩌㏿ᗘࡢศᩓ᭤⥺ࢆᚓࡿࡇ࡜࡛㸪ᆅ┙ࡢ S Ἴ㏿ᗘᵓ㐀ࡢ᝟ሗ㔞ࢆቑࡸࡍࡇ࡜ࢆヨࡳࡽࢀጞࡵ࡚࠸ࡿࠋᒾᡭ኱Ꮫෆ࡛ࡣ㸪㐣ཤ࡟㸪ᒣᮏ࡯࠿ 2017 ࡛㸪ᒾᡭ኱Ꮫෆࡢࢢࣛ࢘ࣥࢻ࡟࠾࠸࡚ 100m ࡢࣜࢽ࢔࢔ࣞ࢖ࢆ⏝࠸࡚ᚤືほཬࡧゎᯒࢆ⾜ࡗࡓࠋࡼࡾ῝㒊ࡢ᝟ሗࢆᚓࡿࡓࡵ࡟ࡣ㸪100m ࡼࡾ㛗࠸⥺㛫㝸ࡀᚲせ࡜ࡉࢀࡿࠋ࠿ࡘ㸪ࡼࡾ㛗᫬㛫ࡢᚤືࢹ࣮ࢱࡢ㔜ྜࡀᚲせ࡛࠶ࡿྍ⬟ᛶࡀ࠶ࡿࠋࡑࡇ࡛㸪ᮏ◊✲࡛ࡣ㸪ᩘⓒ m㞳ࡋ࡚ᚤືィࢆ㓄⨨ࡋ㸪1 ࣨ᭶⛬ᗘ࡜࠸࠺ẚ㍑ⓗ㛗࠸᫬㛫ࡢᚤືほࢆᐇ᪋ࡋ㸪ゎᯒࢆࡋࡓࠋ
㸰㸬ᚤືほ

 ᅗ 1 ࡟ᒾᡭ኱Ꮫෆ࡛ࡢほᆅⅬࢆ♧ࡍࠋᩘⓒ m 㛫㝸

࡛ 3 ᡂศᚤືィࢆ 5 ྎタ⨨ࡋ㸪No.1~No.5 ࡜ࡋࡓࠋ౑⏝ࡋࡓᚤືィࡣࣞࢼ࣮ࢶ࣭࢚ࣞࢡࢺࣟࢽࢡࢫ♫〇ࡢᅛ
᭷࿘ᮇ 5 ⛊୕ᡂศ㏿ᗘィ Lennartz LE-3D/5s ࡛࠶ࡿࠋࢹ࣮ࢱ࣮ࣟ࢞ࡣ㸪ⓑᒣᕤᴗᰴᘧ఍♫ࡢ LS-8800 ࢆ⏝࠸ࡓࠋࢧࣥࣉࣜࣥࢢ࿘Ἴᩘࡣ 100Hz ࡜ࡋࡓࠋᮏほࡣ 2018ᖺ 8 ᭶ 8 ᪥࠿ࡽ 2018 ᖺ 10 ᭶ 3 ᪥ࡢ⣙ 2 ࣨ᭶ᐇ᪋ࡋࡓࠋ
ゎᯒࡣࢹ࣮ࢱ࣮ࣟ࢞࡟୙ලྜࡀ⏕ࡌࡓ௨እࡢ㸪ࡢ࡭ 33᪥ศࢆ౑⏝ࡋࡓࠋLennartz LE-3D/5s ࡢሙྜ㸪ch1 ࡀ UD᪉ྥ㸪ch2 ࡀ NS ᪉ྥ㸪ch3 ࡀ EW ᪉ྥ࡜࡞ࡿࠋ
 ᅗ 2 ࡟ 8 ᭶ 8 ᪥ 2 ᫬ 0 ศ࠿ࡽ 2 ᫬ 59 ศ࡟ほࡉࢀࡓᅗ ᚤືほᆅⅬ

3 ᡂศຍ㏿ᗘἼᙧࢆ♧ࡋࡓࠋୖ࠿ࡽୗ࡟ No.1㸪 No.2㸪No.3㸪 No.4㸪 No.5 ࡜୪ࢇ࡛࠸ࡿࠋࡲࡓ㸪No.3㸪No.4 ㏆ࡃࢆ㏻ࡿ㐨㊰ࡣ஺㏻㔞ࡀከࡃ㸪ࣀ࢖ࢪ࣮㸨

Estimation of group velocity by seismic interferometry analysis of short period microtremors observed atIwate University by K.Sasaki, H.Yamamoto and T.Saito186࡞ሙᡤ࡛࠶ࡗࡓࠋࡲࡓ㸪ᅗ 3 ࡟ᅗ 2 ࡜ྠ᫬้࡛㸪ࡑࢀࡒࢀࡢほⅬࡢ ch1㸪ch2㸪ch3 ࡢࢫ࣌ࢡࢺࣝ

Ἴᙧ࡜ H/V ࢫ࣌ࢡࢺࣝẚࢆ♧ࡋࡓࠋ5Hz ௨ୖࡢ㧗࿘Ἴᖏࡸࣀ࢖ࢪ࣮࡞ሙᡤ࡛࠶ࡿ No.3㸪No.4 ࡟㛵ࡋ࡚ࡣ㸪ከᑡࡢࡎࢀࡀ☜ㄆࡉࢀࡓࡀ㸪2㹼4Hz ௜㏆ࡢప࿘Ἴᖏ࡛ࡣᙧ≧ࡀࡑࢁࡗ࡚࠸ࡿࡇ࡜ࡀ☜ㄆࡉࢀࡓࠋ


ᅗ 3ほ

ࡉࢀࡓ 3 ᡂศࢫ࣌ࢡࢺࣝ࡜H/V ࢫ࣌ࢡࢺࣝẚ(8 ᭶ 8 ᪥ 2 ᫬ 0 ศ࠿ࡽ 2 ᫬ 59 ศ)ᅗ 2ほࡉࢀࡓ 3 ᡂศຍ㏿ᗘἼᙧ (8 ᭶ 8 ᪥ 2 ᫬ 0 ศ࠿ࡽ 2 ᫬ 59 ศ)㸱㸬㔜ྜ┦஫┦㛵ゎᯒ ᇶᮏゎᯒ༊㛫ࢆ 81.92 ⛊࡜ࡋ㸪FFT ࡟ࡼࡿࢫ࣌ࢡࢺࣝゎᯒ࡟ࡼࡾ┦஫┦㛵㛵ᩘࢆィ⟬ࡍࡿࠋEW㸪NS ᡂศ࠿ࡽ㸪radial㸪transverse ᡂศࢆᗙᶆᅇ㌿ࡋ㸪Bensen et al.
(2007)ࡢゎᯒ᪉ἲ࡟ᇶ࡙ࡁ㸪ほࡉࢀࡓᚤື࡟ᑐࡋ࡚࿘Ἴᩘつ᱁໬㸪஧್໬ࢆ࠾ࡇ࡞࠺ࠋradial㸪transverse㸪UDᡂศ࡟ᑐࡋ࡚┦஫┦㛵㛵ᩘࢆィ⟬ࡋ㸪㔜ྜࡋࡓࠋᅗ 4࡟඲⤌ࡳྜࢃࡏࡢ┦஫┦㛵㛵ᩘࢆ㊥㞳ࡈ࡜࡟♧ࡍࠋ௒ᅇࡢほ࠿ࡽᚓࡽࢀࡓ㔜ྜ┦஫┦㛵ࡢࡳ࡛ࡣ㸪Ἴືࡢ

ᅗ 4㊥㞳ࡈ࡜ࡢ඲⤌ࡳྜࢃࡏ┦஫┦㛵㛵ᩘ

187ఏ᧛ࡀ☜ㄆࡋ࡟ࡃ࠸ࡓࡵ㸪᱈Ⰽࡢ⥺࡛ᒣᮏ࡯࠿(2017)࡛ᚓࡽࢀࡓ㔜ྜ┦஫┦㛵ࢆ㔜ࡡྜࢃࡏࡓࠋࡑ
ࢀࡒࢀࡢ᪉ྥ࡛≉ᚩⓗ࡞఩┦ࡢࣛࢢࢱ࢖࣒ࢆẚ࡭࡚ࡳࡿ࡜㸪⣙ 350m ࡢ㊥㞳࡛ radial㸪UD ᪉ྥ࡛ࡣ⣙ 1.3 ⛊࡛࠶ࡿࡀ㸪transverse ᪉ྥ࡛ࡣ⣙ 2.0 ⛊࡜ࣛࢢࢱ࢖࣒ࡀ㛗࠸ࡇ࡜ࡀศ࠿ࡿࠋࡋࡓࡀࡗ࡚㸪transverse ᪉ྥࡢఏ᧛㏿ᗘࡀ㐜࠸ࡇ࡜ࡀண᝿ࡉࢀࡿࠋࡲࡓ㸪௒ᅇࡣ㸪33 ᪥㛫ࡢࡶࡢࢆ㔜ྜࡋ㸪⩌㏿ᗘࡢ᥎ᐃࢆ⾜ࡗࡓࠋ㸲㸬⩌㏿ᗘࡢ᥎ᐃ
 Dziewonski et al.(1969)ࡢ࣐ࣝࢳࣉࣝࣇ࢕ࣝࢱ࣮ゎᯒࢆ⾜࠸㸪⩌㏿ᗘࡢ᥎ᐃࢆ⾜ࡗࡓࠋࡲࡎ㸪No.2
࡜ No.5 ࡢ㔜ྜ┦஫┦㛵࠿ࡽ⟬ᐃࡉࢀࡓ SN ẚࢆᅗ 5 ࡟♧ࡍࠋSN ẚ࡜ࡣ㸪⊃ᖏᇦࣇ࢕ࣝࢱἼᙧࡢໟ⤡⥺ࡢ᭱኱್ࢆࣛࢢࡀ༑ศ኱ࡁ࠸ᖹᆒ⮬஌᣺ᖜ࡛㝖ࡋࡓࡶࡢ࡛࠶ࡿࠋࡘࡲࡾ㸪SN ẚࡀ㧗࠸࡜ಙ㢗ᛶࡀ㧗࠸࡜࠸࠼ࡿࠋ㉥ࡢ⥺ࡀ plus ࡛㸪ᮏ◊✲ࡢṇࡢ᪉ྥ࡛࠶ࡾ㸪㯤⥳ࡢ⥺ࡀ minus ࡛㸪㈇ࡢ᪉ྥ࡛
࠶ࡿࠋḟ࡟㸪ほⅬ No.2 ࡜ No.5 ࡢ㔜ྜ┦஫┦㛵࠿ࡽ᥎ᐃࡉࢀࡓ⩌㏿ᗘࢆᅗ 6 ࡟♧ࡍࠋṇ㈇ࡢࡤࡽ

ࡘࡁࡀࡳࡽࢀࡿࡇ࡜࠿ࡽ㸪SN ẚࡀప࠸ࢹ࣮ࢱࡶΰࡊࡗ࡚࠾ࡾ㸪ಙ㢗ᛶࡢప࠸ࢹ࣮ࢱࡀྵࡲࢀ࡚࠸
ࡿྍ⬟ᛶࡀ⪃࠼ࡽࢀࡿࠋࡇࢀࡽࢆ㋃ࡲ࠼㸪SN ẚࡀ 10 ௨ୖࡢࡶࡢࢆᢳฟࡋࡓୖ࡛㸪᪤Ꮡࣔࢹࣝ࠿ࡽ
ィ⟬ࡋࡓ⩌㏿ᗘࡸᒣᮏ࡯࠿(2017)࠿ࡽᚓࡽࢀࡓほ⩌㏿ᗘ࡜ࡢẚ㍑ࢆ⾜ࡗࡓࠋᅗ 5ほⅬ No.2 ࡜ No.5 ࡢ㔜ྜ┦஫┦㛵࠿ࡽ⟬ᐃࡉࢀࡓ SN ẚᅗ 6ほⅬ No.2 ࡜ No.5 ࡢ㔜ྜ┦஫┦㛵࠿ࡽ᥎ᐃࡉࢀࡓ⩌㏿ᗘ

188㸬᪤Ꮡࣔࢹࣝ࠿ࡽィ⟬ࡋࡓ⩌㏿ᗘࡸᒣᮏ࡯࠿  ࠿ࡽᚓࡽࢀࡓほ⩌㏿ᗘ࡜ࡢẚ㍑

 ᒣᮏ(2000)࡟ࡼࡿ S Ἴ㏿ᗘᵓ㐀࡜㸪ࡇࡢࣔࢹࣝ࠿ࡽィ⟬ࡋࡓ⩌㏿ᗘࢆᅗ 7 ࡟♧ࡍࠋࡲࡓ㸪ᅗ 8 ࡟
ᒣᮏ࡯࠿(2017)ࡢࣜࢽ࢔࢔ࣞ࢖ほ࠿ࡽᚓࡽࢀࡓほ⩌㏿ᗘࢆ♧ࡍࠋᅗ 8 ࡣ㸪బ⸨(2016)ㄽᩥࢆཧ

⪃࡟ࡋ㸪SN ẚࡀ 10 ௨ୖࡢࡶࡢࢆᢳฟࡋࡓ⩌㏿ᗘ࡛࠶ࡿࠋࡇࢀࡽᅗ 7㸪ᅗ 8 ࡜௒ᅇࡢほ⤖ᯝ࠿ࡽᚓࡽࢀࡓ⩌㏿ᗘࡢ SN ẚࡀ 10 ௨ୖࡢࡶࡢࢆ㔜ࡡྜࢃࡏࡓࡶࡢࡀᅗ 9 ࡛࠶ࡿࠋ㐣ཤࡢィ⟬⩌㏿ᗘࡸほ⩌㏿ᗘ࡜ẚ㍑ࡋࡓ⤖ᯝ㸪ࡲࡎ㸪ྛᡂศ࡟ࡼࡗ࡚㸪⩌㏿ᗘࡀ␗࡞ࡗ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡗࡓࠋࡑࡋ

࡚㸪௒ᅇࡢほࡣほⅬ㛫㊥㞳ࡀẚ㍑ⓗ㛗࠸ࡓࡵ㸪3㹼4Hz ⛬ᗘࡢప࠸࿘Ἴᩘᖏࡲ࡛⩌㏿ᗘࡀᚓࡽࢀ࡚࠸ࡓࠋࡲࡓ㸪transverse ᪉ྥࡣ㸪௒ᅇࡢほ⩌㏿ᗘ㸪ᒣᮏ࡯࠿(2017)࠿ࡽᚓࡽࢀࡓほ⩌㏿ᗘ࡜᪤Ꮡࣔࢹࣝ࠿ࡽィ⟬ࡋࡓ⩌㏿ᗘࡀ࡯ࡰ୍⮴ࡋࡓࠋࡇࢀࡽࢆ㋃ࡲ࠼࡚㸪ᒣᮏ࡯࠿(2000)ࡢ S Ἴ㏿ᗘᵓ㐀ࢆ௒ᅇࡢほ⤖ᯝࢆ‶㊊࡛ࡁࡿࡼ࠺࡟ಟṇࡍࡿࠋ
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ᅗ 7 ᒣᮏ(2000)࡟ࡼࡿ S Ἴ㏿ᗘࣔࢹࣝ࡜ࣔࢹࣝ࠿ࡽィ⟬ࡋࡓ⩌㏿ᗘ

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ᅗ 8 ᒣᮏ࡯࠿(2017)࠿ࡽᚓࡽࢀࡓほ⩌㏿ᗘ(SNӍ10)

189

ᅗ 9 ィ⟬⩌㏿ᗘ࡜ほ⩌㏿ᗘ(SNӍ10)ࡢẚ㍑ 㟷ࡢ┤⥺ࡣᒣᮏ(2000)࡛ࡢ᪤Ꮡࣔࢹࣝ࠿ࡽィ⟬ࡋࡓ⩌㏿ᗘ  ㉥࣭㯤⥳ࡣ௒ᅇࡢほ⩌㏿ᗘ ᱈࣭ỈⰍࡣᒣᮏ࡯࠿(2017)ࡢほ⩌㏿ᗘ

㸴㸬ᚑ᮶ࡢᒾᡭ኱Ꮫෆ࡟࠾ࡅࡿ 6 Ἴ㏿ᗘࣔࢹࣝࡢಟṇ ᅗ 10 ࡟ಟṇ๓ࡢ S Ἴ㏿ᗘᵓ㐀࡜ಟṇᚋࡢ S Ἴ㏿ᗘᵓ㐀ࢆ♧ࡍࠋࡲࡓ㸪ᅗ 11 ࡟௒ᅇࡢほ⩌㏿ᗘ࡜ᒣᮏ࡯࠿(2017)ࡢ࠿ࡽᚓࡽࢀࡓほ⩌㏿ᗘ࡟ಟṇ๓ࡢィ⟬⩌㏿ᗘ࡜ಟṇᚋࡢィ⟬⩌㏿ᗘࢆ㔜ࡡࡓࡶࡢࢆ♧ࡍࠋTransverse ᡂศࡣほ⩌㏿ᗘ࡜ィ⟬⩌㏿ᗘࡀ࡯ࡰ୍⮴ࡋࡓࡀ㸪Rayliegh Ἴࡣ radial ᡂศ㸪UD ᡂศࡢ୧᪉࡟Ⓨ⏕ࡍࡿࡢ࡛㸪ほ⩌㏿ᗘ࡜ィ⟬⩌㏿ᗘࡀ᏶඲࡟ࡣ୍⮴ࡋ࡞࠸⤖ᯝ࡜࡞ࡗࡓࠋ
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D E

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ᅗ 10

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(a) ಟṇ๓ࡢS Ἴ㏿ᗘᵓ㐀(b) ಟṇᚋࡢS Ἴ㏿ᗘᵓ㐀

ᅗ 11 ほ⩌㏿ᗘ(SNӍ10)࡟ಟṇ๓ࡢィ⟬⩌㏿ᗘ 㟷⥺ ࡜ಟṇᚋࡢィ⟬⩌㏿ᗘ ㉥⥺ ࢆ㔜ࡡྜࢃࡏࡓࡶࡢ

190㸵㸬⪃ᐹ࡜ࡲ࡜ࡵ 㔜ྜ┦஫┦㛵ゎᯒ࡛ࡣ㸪Ἴືࡢఏ᧛ࢆ☜ㄆࡍࡿࡇ࡜ࡀ࡛ࡁࡓࠋࡲࡓ㸪ᒣᮏ࡯࠿(2017)ࡢᒾᡭ኱Ꮫ
ෆࢢࣛ࢘ࣥࢻ࡛ࡢᚤືほ࡛ࡣ㸪஺㏻᣺ືࢆ⪃៖ࡋ࡞ࡃ࡚ࡶⰋ࠸㟼࠿࡞ࢢࣛ࢘ࣥࢻ࡛⾜ࡗ࡚࠸ࡓࡓࡵ㸪ᚤືィタ⨨ࡢ㝿㸪஺㏻᣺ືࢆ⪃៖ࡏࡎ࡟タ⨨ࢆࡋࡓࠋ௒ᅇᚓࡽࢀࡓゎᯒ⤖ᯝ࠿ࡽ㸪⣙ 1 ࣨ᭶ࡶࡢ㛗᫬㛫ࡢほ࡛࠶ࡿ࡜஺㏻᣺ືࡶ⪃៖ࡋ࡞ࡃ࡚ࡣ࠸ࡅ࡞࠸ࡇ࡜ࡀศ࠿ࡗࡓࠋࡉࡽ࡟ࡼ࠸⤖ᯝࢆᚓࡿࡓࡵ࡟ࡣ㸪┦஫┦㛵㛵ᩘࢆฟࡍ㝿࡟᫬㛫つ᱁໬ࢆ࠿ࡅࡿ࡞࡝ࡀ⪃࠼ࡽࢀࡿࠋ
⩌㏿ᗘࡢ᥎ᐃ࡛ࡣ㸪౛࡜ࡋ࡚ No.2 ࡜ No.5 ࡢ࣌࢔࡛ẚ㍑ࡋࡓࠋᒣᮏ࡯࠿(2017)ࡼࡾẚ㍑ⓗ㛗࠸⥺㛫㝸࡟ࡋࡓࡇ࡜࡛㸪3㹼4Hz ௜㏆ࡢప࿘Ἴᖏ࡟࠾࠸࡚㸪௒ࡲ࡛ᚓࡽࢀ࡚࠸࡞࠿ࡗࡓ⩌㏿ᗘࢆᚓࡿࡇ࡜ࡀ࡛ࡁࡓࠋࡘࡲࡾ㸪㊥㞳࡟ᛂࡌࡓ⩌㏿ᗘࡀồࡵࡽࢀࡿࡇ࡜ࡀࢃ࠿ࡗࡓࠋ௒ᚋࡣ㸪࡝ࡢࡃࡽ࠸ࡢ
῝ᗘࢆ᥈ᰝࡋࡓ࠸࠿࡟ࡼࡗ࡚㸪⥺ࡢ㛗ࡉࢆ⪃࠼㸪ほࢆ⾜࠺ࡇ࡜ࡀồࡵࡽࢀࡿࠋ

ࡲࡓ㸪transverse ᪉ྥ࡛ࡣ㸪ࣆ࣮ࢡࡢ SN ẚࡀ 50 ⛬ᗘ࡛࠶ࡾ㸪᪤Ꮡࣔࢹࣝ࠿ࡽィ⟬ࡋࡓ⩌㏿ᗘࡸᒣᮏ࡯࠿(2017)࡛ࡢほ⩌㏿ᗘ࡜ࡢẚ㍑࡛ࡶศ࠿ࡿࡼ࠺࡟ṇࡋ࠸⩌㏿ᗘࡢ᥎ᐃࡀ࡛ࡁࡓ࡜⪃࠼ࡿࠋ୍᪉࡛㸪radial ᪉ྥཬࡧ UD ᪉ྥ࡛ࡣṇ㈇࡛ࡤࡽࡘࡁࡀ኱ࡁ࠸⤖ᯝ࡜࡞ࡗࡓࠋࡑࡢཎᅉ࡜ࡋ࡚㸪ᐇయἼࡀΰᅾࡋ࡚࠸ࡿྍ⬟ᛶࡀ⪃࠼ࡽࢀࡿࠋTakagi et al. (2014)࡞࡝ࢆᛂ⏝ࡋ࡚㸪⾲㠃Ἴ࡜ᐇయἼࢆศ
㞳ࡉࡏ㸪⢭ᗘࡢ㧗࠸ゎᯒࢆヨࡳࡿᚲせࡀ࠶ࡿࠋ ᚑ᮶ࡢ S Ἴ㏿ᗘࣔࢹࣝࡢಟṇ࡛ࡣ㸪௒ᅇࡢほ⤖ᯝ࡟ྜࢃࡏࡿࡼ࠺࡟ S Ἴ㏿ᗘᵓ㐀ࢆಟṇࡋࡓࠋ௒ᚋࡣ㸪⢭ᗘྥୖࡢࡓࡵ㸪㑇ఏⓗ࢔ࣝࢦࣜࢬ࣒㏫ゎᯒ➼ࢆ⏝࠸ࡿࡇ࡜ࡶ᭷ຠ࡛࠶ࡿ࡜⪃࠼ࡽࢀࡿࠋཧ⪃ᩥ⊩Bensen, G.D., M.H. Ritzwoller, M.P. Barmin, A.L. Levshin, F. Lin, M.P. Moschetti, (2007), Processing
seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements,Geophys. J. Int., 169, 1239-1260.
Dziewonski, A., S.Bloch, and M. Landisman(1969), A technique for the analysis of transient seismic signals㸪
Bull. Seism. Soc. Am., 59, 427-444.
୰ཎ(2015)㸪ᆅ㟈Ἴᖸ΅ἲ㸪ࡑࡢ 1 Ṕྐⓗ⤒⦋࡜ཎ⌮㸪ᆅ㟈㸪➨ 2 ㍴㸪➨ 68 ᕳ(2015)㸪75-82 㡫Okada. H.㸦2003㸧㸸The Microtremor Survey Method, Geophysical Monograph Series, No. 12, Society ofExploration Geophysicists, 135
Takagi R., Nakahara H., Kono T., and Okada T.(2014), Separating body and Rayleigh waves with crossterms of the cross-correlation tensor of ambient noise, J. Geophys. Res., 10.1002/2013JB010824.
ᒣᮏⱥ࿴(2000), 3 ᡂศᚤື࢔ࣞ࢖ほ࡟ࡼࡿ Love Ἴࡢ఩┦㏿ᗘࡢ᥎ᐃࡢヨࡳ, ≀⌮᥈ᰝ, 53,153-166.
ᒣᮏⱥ࿴, బࠎᮌᜤ㍜, 㰺⸨๛㸦2017㸧: ὸ㒊 2 ḟඖ S Ἴ㏿ᗘᵓ㐀᥎ᐃࢆ┠ⓗ࡜ࡋࡓࣜࢽ࢔࢔ࣞ࢖࡛ほࡉࢀࡓ▷࿘ᮇᚤືࡢᆅ㟈Ἴᖸ΅ἲゎᯒ-ᒾᡭ኱Ꮫᵓෆ࡟࠾ࡅࡿヨࡳ-, ᮾ໭ᆅᇦ⅏ᐖ⛉Ꮫ◊✲➨ 53 ᕳ㸪157-162.
ᒣᮏⱥ࿴㸪 బ⸨ྐె㸪 㰺⸨๛㸦2016㸧: ⚟ᓥ┴ࡢᗈᖏᇦࣜࢽ࢔࢔ࣞ࢖࡛ほ㟈Ἴᖸ΅ἲ㸪 ᮾ໭ᆅᇦ⅏ᐖ⛉Ꮫ◊✲ ➨ 52 ᕳ㸪263-268.

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