ＩＳＳＮ１３４６－７８３２

国立研究開発法人海上・港湾・航空技術研究所

港湾空港技術研究所
報告
REPORT OF
THE PORT AND AIRPORT RESEARCHINSTITUTE

VOL.58No.1 August

NAGASE,YOKOSUKA,JAPANNATIONAL INSTITUTE OF MARITIME,PORT AND AVIATION TECHNOLOGY

2019

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ᢏ⾡◊✲ᡤሗ࿌㸦REPORT OF PARI㸧➨ 58 ᕳ ➨ 1 ྕ㸦Vol. 58, No. 1㸧, 2019 ᖺ8᭶㸦August 2019㸧┠  ḟ㸦CONTENTS㸧
1.

୕ḟඖὶయሙ࡛ࡢಀ␃⯪⯧ືᦂゎᯒᡭἲࡢ㛤Ⓨ···················································································· ┦⏣ᗣὒ㸪ᖹᒣඞஓ ······· 3
㸦Development of Analysis Method of Moored Ship Motion in 3D Fluid Field·················································································· Yasuhiro AIDA, Katsuya HIRAYAMA㸧

2. ␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝······················································································· 㔝ὠཌ㸪㛗ᆏ㝧௓ ······ 41
㸦Strong Motion Simulation with the Pseudo Point-source Model for Intraslab Earthquakes㸧
···················································································· Atsushi NOZU, Yosuke NAGASAKA㸧‴✵ ᢏ⾡◊✲ᡤሗ࿌➨  ᕳ➨  ྕ  ␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢ
ࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝㔝ὠ ཌ*࣭㛗ᆏ 㝧௓**㻌㻌せ  ᪨㻌 ᮏ◊✲ࡢᑐ㇟࡜ࡍࡿࢫࣛࣈෆᆅ㟈ࡣỿࡳ㎸ࡴᾏὒࣉ࣮ࣞࢺࡢෆ㒊࡛Ⓨ⏕ࡍࡿᆅ㟈࡛࠶ࡾ㸪ෆ㝣ᆅẆෆᆅ㟈ࡸࣉ࣮ࣞࢺቃ⏺ᆅ㟈࡜␗࡞ࡿࢱ࢖ࣉࡢᆅ㟈࡛࠶ࡿ㸬㏆ᖺ㸪㤳㒔┤ୗ࡛ࡢ኱つᶍ࡞ࢫࣛࣈෆ
ᆅ㟈ࡢⓎ⏕ࡀᠱᛕࡉࢀࡿ࡞࡝㸪ࢫࣛࣈෆᆅ㟈࡟ᑐࡍࡿᙉ㟈ືணࡢ㔜せᛶࡀ㧗ࡲࡗ࡚࠸ࡿ㸬 ⌧ᅾ㸪ᐇ⏝ⓗ࡞ᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࡓࡵࡢ㟈※ࣔࢹࣝ࡜ࡋ࡚ࡣ㸪᩿ᒙ㠃ୖ࡟▴ᙧࡢ࢔ࢫ࣌
ࣜࢸ࢕ࢆ⨨࠸ࡓ≉ᛶ໬㟈※ࣔࢹࣝࡀ⏝࠸ࡽࢀࡿࡇ࡜ࡀከ࠸ࡢ࡟ᑐࡋ㸪ⴭ⪅ࡽࡣࡇࢀࢆ኱ᖜ࡟༢⣧໬
ࡋࡓ␲ఝⅬ㟈※ࣔࢹࣝࢆᥦ᱌ࡋ࡚࠸ࡿ㸬␲ఝⅬ㟈※ࣔࢹ࡛ࣝࡣ㸪ᙉ㟈ືࢆ⏕ᡂࡍࡿ 1 ࡘࡲࡓࡣ」ᩘ
ࡢࢧࣈ࢖࣋ࣥࢺࡀ᩿ᒙ㠃ୖ࡟࠶ࡿ࡜⪃࠼ࡿ㸬ࡑࡋ࡚㸪ྛࠎࡢࢧࣈ࢖࣋ࣥࢺ࡟ᑐࡋ㸪ࡑࡢෆ㒊࡟࠾ࡅࡿࡍ࡭ࡾࡢ᫬✵㛫ศᕸࢆヲ⣽࡟ࡣࣔࢹࣝ໬ࡏࡎ㸪ྛࠎࡢࢧࣈ࢖࣋ࣥࢺࡀ⏕ᡂࡍࡿ㟈※ࢫ࣌ࢡࢺࣝࡢ
ࡳࢆࣔࢹࣝ໬ࡍࡿ㸬␲ఝⅬ㟈※ࣔࢹࣝࡣ㸪ᚑ᮶ࡢ≉ᛶ໬㟈※ࣔࢹࣝ࡜ẚ㍑ࡋ࡚኱ᖜ࡟ࣃ࣓ࣛࢱᩘࡀ
ᑡ࡞࠸࡜࠸࠺≉ᚩࢆ᭷ࡋ࡚࠾ࡾ㸪ࡇࢀࡀᐇົ࡟ά⏝ࡉࢀࡿࡼ࠺࡟࡞ࢀࡤ㸪ᐇົ࡟࠾ࡅࡿ㈇ᢸࡢ㍍ῶ
࡟ᐤ୚ࡍࡿ࡜⪃࠼ࡽࢀࡿ㸬 ␲ఝⅬ㟈※ࣔࢹࣝࡣ㸪ࡇࢀࡲ࡛ࣉ࣮ࣞࢺቃ⏺ᆅ㟈࡛࠶ࡿᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈࡞࡝࡬ࡢ㐺⏝ᛶࡀ☜ㄆࡉࢀ࡚࠸ࡿࡀ㸪ࢫࣛࣈෆᆅ㟈࡟ᑐࡋ࡚ࡣ୍㒊ࡢᆅ㟈ࢆ㝖ࡁ㐺⏝ᛶࡢ☜ㄆࡀ࡞ࡉࢀ࡚࠸࡞࠿ࡗࡓ㸬ࡑࡇ࡛ᮏ◊✲࡛ࡣ㸪㏆ᖺࢃࡀᅜ࿘㎶࡛Ⓨ⏕ࡋᙉ㟈グ㘓ࡶᚓࡽࢀ࡚࠸ࡿ 6 ࡘࡢ኱つᶍ࡞ࢫࣛࣈෆᆅ㟈ࢆᑐ㇟࡟㸪ᐇ㝿࡟␲ఝⅬ㟈※ࣔࢹࣝࢆᵓ⠏ࡋ㸪ࡑࢀ࡟ࡼࡿᙉ㟈ືࡢ෌⌧ᛶࢆ᳨ウࡋࡓ㸬 ᳨ウࡢ⤖ᯝ㸪࠸ࡎࢀࡢᆅ㟈࡟ᑐࡋ࡚ࡶ㸪㟈※ࣃ࣓ࣛࢱࡢタᐃࡀ㐺ษ࡛࠶ࢀࡤ㸪␲ఝⅬ㟈※ࣔࢹࣝ
࡟ࡼࡾ㟈※࿘㎶ࡢᙉ㟈ືࢆᴫࡡⰋዲ࡟෌⌧࡛ࡁࡿࡇ࡜ࢆ☜ㄆࡋࡓ㸬ࢫࣛࣈෆᆅ㟈ࡢほグ㘓ࡣ㸪㟈※࡛ࡢ◚ቯࡢᙳ㡪ࡀ┤᥋ⓗ࡟⾲ࢀࡓグ㘓࠿ࡽᆅ┙ࡢᛂ⟅ࡢᙳ㡪ࢆᙉࡃཷࡅࡓグ㘓ࡲ࡛ከ✀ከᵝ࡛࠶ࡿࡀ㸪ࡑࢀࡽࢆ␲ఝⅬ㟈※ࣔࢹࣝ࡜࠸࠺୍ࡘࡢᯟ⤌ࡳࡢୗ࡛ㄝ࡛᫂ࡁࡿࡇ࡜ࡀࢃ࠿ࡗࡓ㸬ಶࠎࡢᆅ㟈ࡢ෌⌧࡟⏝࠸ࡓ㟈※ࣃ࣓ࣛࢱ࡜ᆅ㟈ࡢつᶍ࡜ࡢ㛵ಀࢆ᳨ウࡋࡓ࡜ࡇࢁ㸪ࢫࣛࣈෆᆅ㟈࡟㛵ࡍࡿ᪤ ࡢ◊✲࡜ᩚྜⓗ࡞⤖ᯝࡀᚓࡽࢀࡓ㸬࣮࣮࢟࣡ࢻ㸸ࢫࣛࣈෆᆅ㟈㸪␲ఝⅬ㟈※ࣔࢹࣝ㸪ᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥ㸪࣓࢜࢞ࢫࢡ࢚࢔ࣔࢹࣝ* ᆅ㟈㜵⅏◊✲㡿ᇦ㛗** ᆅ㟈㜵⅏◊✲㡿ᇦ ᆅ㟈ື◊✲ࢢ࣮ࣝࣉ ◊✲ᐁࠛ239-0826 ⚄ዉᕝ┴ᶓ㡲㈡ᕷ㛗℩3-1-1 ‴✵ ᢏ⾡◊✲ᡤ㟁ヰ㸸046-844-5058  Fax㸸046-844-0839  E-mail㸸nozu@p.mpat.go.jp- 41 -REPORT OF THE PORT AND
AIRPORT RESEARCH INSTITUTE
Vol.58, No.1 (August 2019)

Strong Motion Simulation with the Pseudo Point-source Modelfor Intraslab Earthquakes

Atsushi NOZU*, Yosuke NAGASAKA**

Synopsis
This study is focused on intraslab earthquakes occurring within subducting oceanic plate.
Recently intraslab earthquakes are becoming increasingly important as targets of strong motion
prediction, partly because a large intraslab earthquake is anticipated to occur within the subducting
Philippine Sea Plate, just beneath metropolitan Tokyo.
Currently, strong motion prediction is largely dependent on so called the “characterized source
model”, which is a combination of rectangular asperities, however, the authors have been proposing
a much simpler source model called the “pseudo point source model”. The model considers one ormore subevents generating strong ground motions. In the model, the spatio-temporal distribution ofslip within a subevent is not modeled. Instead, the source spectrum associated with the rupture of a
subevent is modeled and it is assumed to follow the omega-square model. The model involves muchless model parameters than conventional models; thus it could be suitable for practical purposes.
The pseudo point-source model had been validated for several earthquakes including the 2011
Tohoku earthquake, however, its applicability to intraslab earthquakes has not been sufficiently
investigated. Therefore, in this study, the pseudo point source model was applied to six large
intraslab earthquakes in and around Japan which provided strong motion records.
The results revealed that, if the source parameters were appropriately selected, strong motion
records due to intraslab earthquakes can well be explained with the pseudo point-source model. A
wide range of records, some including direct effects of rupture process and some including
dominant effects of ground response, can be explained within the framework of the pseudo
point-source model. Empirical relations between source parameters and seismic moment were
derived, which were found to be consistent with existing relations for intraslab earthquakes basedon the characterized source model.
Key Words: intraslab earthquake, pseudo point-source model, strong motion simulation, ω-2 model* Director of Earthquake Disaster Prevention Engineering Department** Researcher, Engineering Seismology Group
3-1-1, Nagase, Yokosuka, Kanagawa 239-0826, JapanPort and Airport Research Institute
Phone : +81-46-844-5058
Fax : +81-46-844-0839
E-mail : nozu@p.mpat.go.jp

- 42 -┠    ḟせ  ᪨

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- 44 -

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝ࡣࡌࡵ࡟
ᮏ◊✲࡛ᑐ㇟࡜ࡍࡿࢫࣛࣈෆᆅ㟈ࡣ᪥ᮏิᓥࡢୗ࡟₯ࡾ㎸ࡴᾏഃࣉ࣮ࣞࢺࡢෆ㒊࡛Ⓨ⏕ࡍࡿᆅ㟈࡛࠶ࡾ㸦ᅗ㸧㸪ෆ㝣ᆅẆෆᆅ㟈ࡸࣉ࣮ࣞࢺቃ⏺ᆅ㟈࡜␗࡞ࡿࢱ࢖
ࣉࡢᆅ㟈࡛࠶ࡿ㸬ᡃࡀᅜ࡛ࡣ㸪ᙉ㟈ィࡢᑟධ௨㝆ࡔࡅࢆ
㸪2003 ᖺ 5 ᭶ 26 ᪥ぢ࡚ࡶ㸪1993 ᖺ㔲㊰Ἀᆅ㟈㸦Mw7.6㸧ᐑᇛ┴໭㒊ࡢᆅ㟈㸦Mw7.1㸧࡞࡝㸪⿕ᐖࢆక࠺ࢫࣛࣈෆ
ᆅ㟈ࡀⓎ⏕ࡋ࡚࠸ࡿ㸬୰ኸ㜵⅏఍㆟࣭㤳㒔┤ୗᆅ㟈ᑐ⟇᳨ウ࣮࣡࢟ࣥࢢࢢ࣮ࣝࣉࡢ᭱⤊ሗ࿌㸦2013 ᖺ 12 ᭶㸧࡛ࡣ㸪㤳㒔ᅪ࡛㜵⅏࣭ῶ⅏ᑐ⟇ࡢᑐ㇟࡜ࡍࡿᆅ㟈࡜ࡋ࡚㸪┦ᶍࢺࣛࣇ࡛Ⓨ⏕ࡍࡿ኱つᶍ࡞ࣉ࣮ࣞࢺቃ⏺ᆅ㟈࡜࡜ࡶ࡟㸪ࣇ࢕ࣜࣆࣥᾏࣉ࣮ࣞࢺෆࡢࢫࣛࣈෆᆅ㟈㸦Mw7.3㸧
ࢆᣲࡆ࡚࠸ࡿ㸬ࡇ࠺ࡋࡓࡇ࡜࠿ࡽ㸪ࢫࣛࣈෆᆅ㟈࡟ᑐࡍࡿᙉ㟈ືணࡢ㔜せᛶࡀ㧗ࡲࡗ࡚࠸ࡿ㸬࡞࠾㸪ᾏഃࣉ࣮ࣞࢺෆ㒊࡛Ⓨ⏕ࡍࡿᆅ㟈࡟ࡣ㸪ᾏ⁁࠿ࡽ₯ࡾ㎸ࢇࡔᚋࡢࣉ࣮ࣞࢺෆ㒊࡛Ⓨ⏕ࡍࡿࠕࢫࣛࣈෆᆅ㟈ࠖ࡜㸪₯ࡾ㎸ࡴ๓ࡢࣉ࣮ࣞࢺෆ㒊࡛Ⓨ⏕ࡍࡿࠕ࢔࢘ࢱ࣮ࣛ࢖ࢬᆅ㟈ࠖࡀ࠶ࡿ㸦ᅗ㸧㸬ࡇࡢ࠺ࡕ࢔࢘ࢱ࣮ࣛ࢖ࢬᆅ㟈ࡣ㸪ὠἼࡢἼ※࡜ࡋ࡚㆙ᡄࡍࡿᚲせࡀ࠶ࡿࡶࡢࡢ㸪Ἀྜ࡛Ⓨ⏕ࡍࡿᆅ㟈࡛࠶ࡾ㸪⪏㟈タィୖࢡࣜࢸ࢕࢝ࣝ࡜࡞ࡿྍ⬟ᛶࡣᑡ࡞࠸㸬ࡑࡇ࡛㸪ᮏ◊✲࡛ࡣࢫࣛࣈෆᆅ㟈ࢆᑐ㇟࡜ࡋ࡚ᙉ
㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥᡭἲ࡟㛵ࡍࡿ᳨ウࢆ⾜࠺㸬ᅗ 㟈※ࣔࢹࣝࡢ༢⣧໬ࡢ㐣⛬※ࣔࢹࣝ⮬యࡀ⌧㇟ࢆ༢⣧໬ࡋࡓࣔࢹ࡛ࣝ࠶ࡿ㸬ࡋ࠿ࡋ࡞ࡀࡽ㸪≉ᛶ໬㟈※ࣔࢹࣝࡣ㸪ಶࠎࡢ࢔ࢫ࣌ࣜࢸ࢕ࡢ㛗ࡉ㸪ᖜ㸪◚ቯఏ᧛ᵝᘧ㸪◚ቯఏ᧛㏿ᗘ࡞࡝㸪Ỵᐃࡍ࡭ࡁࣃ࣓ࣛࢱࢆࡲࡔከࡃྵࢇ࡛࠸ࡿ㸬 ࡇࢀ࡟ᑐࡋ࡚ⴭ⪅ࡽࡣ㸪᪤Ꮡࡢ≉ᛶ໬㟈※ࣔࢹࣝࢆ኱
ᖜ࡟༢⣧໬ࡋࡓ␲ఝⅬ㟈※ࣔࢹࣝࢆᥦ᱌ࡋ࡚࠸ࡿ
㸦㔝ὠ㸪
2012㸧㸬␲ఝⅬ㟈※ࣔࢹ࡛ࣝࡣ㸪኱ᆅ㟈ࡢ㟈※᩿ᒙ㠃ୖ࡟
1 ࡘࡲࡓࡣ」ᩘࡢⅬ࡛⾲ࡉࢀࡿࢧࣈ࢖࣋ࣥࢺ㸦ᅗ(c)㸧

ᅗ ࢃࡀᅜ࿘㎶࡛Ⓨ⏕ࡍࡿᆅ㟈ࡢ✀㢮ࢆ⪃࠼㸪ࡇࢀࡀᙉ㟈ືࢆ⏕ᡂࡍࡿ࡜⪃࠼ࡿ㸬ࡇࢀࡣ㸪≉ᛶ໬㟈※ࣔࢹࣝ࡟࠾ࡅࡿ࢔ࢫ࣌ࣜࢸ࢕㸦ࡲࡓࡣ SPGA㸧⌧ᅾ㸪ᐇ⏝ⓗ࡞ᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥ㸦౛࠼ࡤ᪥ᮏ

࡟┦ᙜࡍࡿࡶࡢ࡛࠶ࡿ㸬ࡑࡋ࡚㸪ྛࠎࡢࢧࣈ࢖࣋ࣥࢺ࡟

‴༠఍㸪2018㸧ࡢࡓࡵࡢ㟈※ࣔࢹࣝ࡜ࡋ࡚ࡣ㸪≉ᛶ໬ᑐࡋ㸪ࡑࡢෆ㒊࡟࠾ࡅࡿࡍ࡭ࡾࡢ᫬✵㛫ศᕸࢆヲ⣽࡟ࡣ㟈※ࣔࢹࣝ㸦౛࠼ࡤ㸪㔩Ụ࣭ධ಴㸪1997㸹Miyake et al., 2003㸧

ࣔࢹࣝ໬ࡏࡎ㸪ࡑࡢ௦ࢃࡾ㸪ྛࠎࡢࢧࣈ࢖࣋ࣥࢺࡀ⏕ᡂࡀ⏝࠸ࡽࢀࡿࡇ࡜ࡀከ࠸㸬ࡇࢀࡣ㸪㟈※᩿ᒙ㠃ୖ࡛≉࡟ࡍࡿ㟈※ࢫ࣌ࢡࢺࣝࡢࡳࢆࣔࢹࣝ໬ࡍࡿ㸬ࡑࡋ࡚㸪㟈※ࡍ࡭ࡾ㸦ࡲࡓࡣࡍ࡭ࡾ㏿ᗘ㸧ࡢ኱ࡁ࠸㡿ᇦࢆ㛗᪉ᙧࡢ࢔ࢫ࣌ࢡࢺࣝࡣ࣓࢜࢞ࢫࢡ࢚࢔ࣔࢹࣝ㸦Aki, 1967㸧࡟ᚑ࠺ࢫ࣌ࣜࢸ࢕㸦ࡲࡓࡣ SPGA㸧࡜ࡋ࡚ࣔࢹࣝ໬ࡋ㸪ࡑࡇ࠿࡜௬ᐃࡍࡿ㸬ࡇࢀ࡟ࡼࡾ㸪Ỵᐃࡍ࡭ࡁ㟈※ࣃ࣓ࣛࢱࡢᩘ

ࡽᙉ㟈ືࡀ⏕ᡂࡉࢀࡿ࡜⪃࠼ࡿࣔࢹ࡛ࣝ࠶ࡿ㸦ᅗࡣᚑ᮶ࡢ≉ᛶ໬㟈※ࣔࢹࣝࡼࡾࡶ኱ᖜ࡟ᑡ࡞ࡃ࡞ࡗ࡚࠸

(b)㸧㸬ࡇࡢ࡜ࡁ㸪㛗᪉ᙧࡢෆ㒊࡟࠾࠸࡚ࡣ㸪ࡍ࡭ࡾࡿ㸬ࡸࡍ࡭ࡾ㏿ᗘࡣ୍ᵝ࡛࠶ࡿ࡜⪃࠼ࡿࡇ࡜ࡀከ࠸㸬ࡶࡕࢁࡇࡢࡼ࠺࡟㸪␲ఝⅬ㟈※ࣔࢹࣝࡣᚑ᮶ࡢ㟈※ࣔࢹࣝ࡟ࢇ㟈※᩿ᒙ㠃ୖ࡟࠾ࡅࡿᐇ㝿ࡢࡍ࡭ࡾࡸࡍ࡭ࡾ㏿ᗘࡢศẚ࡭኱ᖜ࡟༢⣧໬ࡉࢀỴᐃࡍ࡭ࡁࣃ࣓ࣛࢱᩘࡀᑡ࡞࠸࡜

ᕸࡣࡼࡾ」㞧࡛࠶ࡿ࡜⪃࠼ࡽࢀ㸦ᅗ(a)㸧㸪≉ᛶ໬㟈࠸࠺≉ᚩࢆ᭷ࡋ࡚࠸ࡿࡇ࡜࠿ࡽ㸪ࡇࢀ࡟ࡼࡾᚑ᮶ࡢ㟈※- 45 -

㔝ὠ ཌ࣭㛗ᆏ 㝧௓ࣔࢹࣝ࡜ྠ➼ࡢ⢭ᗘ࡛ᙉ㟈ືࡀィ⟬࡛ࡁࡿࡢ࡛࠶ࢀࡤ㸪ᐇົ࡟࠾࠸࡚ࡓ࠸࡬ࢇ᭷⏝࡞ࣔࢹࣝ࡟࡞ࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡲࡓ㸪ᐇ㝿㸪␲ఝⅬ㟈※ࣔࢹࣝࢆ 2011 ᖺᮾ໭ᆅ᪉ኴᖹὒ
Ἀᆅ㟈࡟㐺⏝ࡋࡓ࡜ࡇࢁ㸪ᚑ᮶ࡢࣔࢹࣝ࡜ኚࢃࡽ࡞࠸⛬ᗘ࡟ᙉ㟈ືࢆ෌⌧࡛ࡁࡿࡇ࡜ࡀ☜ㄆࡉࢀ࡚࠸ࡿ㸦㔝ὠ㸪
2012㸧
㸬
␲ఝⅬ㟈※ࣔࢹࣝࡢ✀ࠎࡢᆅ㟈࡟ᑐࡍࡿ㐺⏝ᛶ࡟ࡘ࠸࡚ࡣ௒ᚋࡉࡽ࡟ㄪ࡭࡚࠸ࡃᚲせࡀ࠶ࡿࡀ㸪࡞࠿࡛ࡶࢫࣛ
ࣈෆᆅ㟈ࡣ␲ఝⅬ㟈※ࣔࢹࣝࡢ㐺⏝ᑐ㇟࡜ࡋ࡚᭷ᮃ࡛࠶
ࡿ࡜⪃࠼ࡽࢀࡿ㸬࡞ࡐ࡞ࡽ㸪ಶࠎࡢࢧࣈ࢖࣋ࣥࢺࢆⅬ࡛⾲⌧ࡍࡿ࡜࠸࠺␲ఝⅬ㟈※ࣔࢹࣝࡢ≉ᛶୖ㸪ෆ㝣ᆅẆෆᆅ㟈࡞࡝࡛᩿ᒙ㠃㏆ഐ࡛ࡢᙉ㟈ືࢆホ౯ࡍࡿሙྜ࡟ࡣ␲
ఝⅬ㟈※ࣔࢹࣝࡢ㝈⏺ࡀ┦ᑐⓗ࡟⾲ࢀࡸࡍ࠸࡜⪃࠼ࡽࢀࡿࡢ࡟ᑐࡋ㸪ࢫࣛࣈෆᆅ㟈࡛ࡣ᩿ᒙ㠃࡜ᙉ㟈ືホ౯ᑐ㇟ᆅⅬࡢ㛫࡟࠶ࡿ⛬ᗘࡢ㊥㞳ࡀᏑᅾࡍࡿࡢ࡛㸦ᅗ㸧㸪┦ᑐⓗ࡟␲ఝⅬ㟈※ࣔࢹࣝࡀ㐺⏝ࡋࡸࡍ࠸࡜⪃࠼ࡽࢀࡿࡓ

ᅗ ᮏ◊✲࡛ᑐ㇟࡜ࡋࡓᆅ㟈ࡢ㟈ኸ㸦‫ڦ‬㸧ࡵ࡛࠶ࡿ㸬㸦‫ࡣڸ‬㛗ᆏ࣭㔝ὠ㸦2016㸧ࡢᑐ㇟ᆅ㟈㸧

␲ఝⅬ㟈※ࣔࢹࣝࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝஦౛࡜ࡋ࡚
ࡣ㸪2003 ᖺ 5 ᭶ 26 ᪥ᐑᇛ┴໭㒊ࡢᆅ㟈㸦Mw7.0㸧࡬ࡢ㐺࡙ࡃᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥᡭἲ࡟ࡘ࠸࡚㏙࡭㸦➨ 2 ❶㸧㸪⏝஦౛㸦ⱝ஭௚㸪2014㸧
㸪2005 ᖺ 7 ᭶ 23 ᪥༓ⴥ┴୰㒊ࡢࡘ࡙࠸࡚ୖグࡢྛᆅ㟈࡟ࡘ࠸࡚ࡢ᳨ウ⤖ᯝࢆ⤂௓ࡋ㸦➨ᆅ㟈㸦Mw5.9㸧࡬ࡢ㐺⏝஦౛㸦㛗ᆏ࣭㔝ὠ㸪2016㸧ࡀ࠶

3 ❶㸧㸪ࡑࡢୖ࡛㟈※ࣃ࣓ࣛࢱࡢ⤫ィⓗᛶ㉁࡟ࡘ࠸᳨࡚ウࡿ㸬ࡋ࠿ࡋ࡞ࡀࡽ㸪ࡼࡾつᶍࡢ኱ࡁ࡞ࡶࡢࡶྵࡵ㸪」ᩘ

ࡍࡿ㸦➨ 4 ❶㸧㸬ࡢࢫࣛࣈෆᆅ㟈࡟ᑐࡍࡿ␲ఝⅬ㟈※ࣔࢹࣝࡢ㐺⏝ᛶࢆ⥙⨶ⓗ࡟ㄪ࡭ࡓ◊✲ࡣࡇࢀࡲ࡛Ꮡᅾࡋ࡞࠸㸬␲ఝⅬ㟈※ࣔࢹࣝࡑࡇ࡛㸪ᮏ◊✲࡛ࡣ㸪」ᩘࡢࢫࣛࣈෆᆅ㟈ࢆᑐ㇟࡟㸪ᐇ㝿࡟␲ఝⅬ㟈※ࣔࢹࣝࢆᵓ⠏ࡋ㸪ࡑࢀ࡟ࡼࡿᙉ㟈ືࡢ෌⌧ᛶࢆ᳨ウࡍࡿ࡜࡜ࡶ࡟㸪㟈※ࣃ࣓ࣛࢱࡢ⤫ィⓗᛶ㉁ ᮏ❶࡛ࡣ␲ఝⅬ㟈※ࣔࢹࣝ࡜ࡑࢀ࡟ᇶ࡙ࡃᙉ㟈ືࢩ࣑࡟ࡘ࠸࡚ࡶ᳨ウࡍࡿ㸬࡞࠾ᮏ◊✲࡛ࡣ௨ୗ࡟♧ࡍࢫࣛࣈ࣮ࣗࣞࢩࣙࣥᡭἲ㸦㔝ὠ㸪2012㸧࡟ࡘ࠸࡚㏙࡭ࡿ㸬ෆᆅ㟈ࢆᑐ㇟࡜ࡍࡿ㸬ࡇࡇ࡛ࡣᆅ㟈ࢆ࡯ࡰ㟈※఩⨨ࡢ㡰 ␲ఝⅬ㟈※ࣔࢹ࡛ࣝࡣ㸪ࡲࡎ㸪኱ᆅ㟈ࡢ㟈※᩿ᒙ㠃ୖ࡟໭ᮾ࠿ࡽ༡す࡟୪࡭࡚࠾ࡾ㸪௨ୗࡢ❶࡛ࡣࡇࡢ㡰᳨࡛࡟ᙉ㟈ືࢆ⏕ᡂࡍࡿ 1 ࡘࡲࡓࡣ」ᩘࡢࢧࣈ࢖࣋ࣥࢺࡀᏑ

ウ⤖ᯝࢆ♧ࡍ㸬ࡇࢀࡽࡢᆅ㟈ࡢ㟈ኸࢆᅗ ࡟♧ࡍ㸬ᅾࡍࡿ࡜⪃࠼ࡿ㸬ࡑࡋ࡚ྛࠎࡢࢧࣈ࢖࣋ࣥࢺࡢ◚ቯ࡟ࡼࡿ㟈※ࢫ࣌ࢡࢺࣝȁܵሺ݂ሻȁࡣḟᘧࡢ࣓࢜࢞ࢫࢡ࢚࢔ࣔࢹࣝ
㸦Aki, 1967; Boore, 1983㸧࡟ᚑ࠺࡜௬ᐃࡍࡿ㸬

1993 ᖺ㔲㊰Ἀᆅ㟈㸦Mw7.6㸧
2003 ᖺ 5 ᭶ 26 ᪥ᐑᇛ┴໭㒊ࡢᆅ㟈㸦Mw7.0㸧
2011 ᖺ 4 ᭶ 7 ᪥ᐑᇛ┴ᮾ᪉Ἀࡢᆅ㟈㸦Mw7.1㸧

ȁܵሺ݂ሻȁ ൌ ܴఏథ ή ‫ ܵܨ‬ή ܴܲܶ‫ ܰܶܫ‬ή

2009 ᖺ 8 ᭶ 11 ᪥㥴Ἑ‴༡㒊ࡢᆅ㟈㸦Mw6.2㸧

ெబೌሺଶగ௙ሻమ

ସగఘ௏ೞ య ଵାሺ௙Τ௙೎ ሻమ(2.1)

2004 ᖺ 9 ᭶ 5 ᪥⣖ఀ༙ᓥ༡ᮾἈࡢᆅ㟈ࡢ๓㟈
㸦Mw7.2㸧ࡇࡇ࡟‫ܯ‬଴௔ ࡣࢧࣈ࢖࣋ࣥࢺࡢᆅ㟈࣮࣓ࣔࣥࢺ㸪݂௖ ࡣࢧࣈ࢖2004 ᖺ 9 ᭶ 5 ᪥⣖ఀ༙ᓥ༡ᮾἈࡢᆅ㟈ࡢᮏ㟈
㸦Mw7.5㸧࣋ࣥࢺࡢࢥ࣮ࢼ࣮࿘Ἴᩘ㸪ߩࡣ㟈※ᇦ࡟࠾ࡅࡿ፹㉁ࡢᐦ
ࡇࡢ࠺ࡕ⣖ఀ༙ᓥ༡ᮾἈࡢ 2 ࡘࡢᆅ㟈ࡣᅗ ࠿ࡽࢃ࠿ᗘ㸪ܸ௦ ࡣ S Ἴ㏿ᗘࢆ♧ࡍ㸬ܴఏథ ࡣࣛࢹ࢕࢚࣮ࢩࣙࣥಀᩘ

ࡿࡼ࠺࡟࡯ࡰᾏ⁁㍈ୖ࡛Ⓨ⏕ࡋ࡚࠾ࡾ㸪ࢫࣛࣈෆᆅ㟈࡜㸦ᮏ◊✲࡛ࡣ඲᪉఩࡬ࡢᖹᆒ್࡛࠶ࡿ 0.63 ࢆ⏝࠸ࡓ㸧㸪ࡶ࢔࢘ࢱ࣮ࣛ࢖ࢬᆅ㟈࡜ࡶゝ࠼ࡿᆅ㟈࡛࠶ࡿࡀ㸪ᮏ◊✲‫⾲⏤⮬ࡣܵܨ‬㠃࡟ࡼࡿቑᖜࡢຠᯝ㸦=2㸧㸪ܴܲܶ‫ࡣܰܶܫ‬ᆅ㟈ື࡛ࡣ㸪つᶍࡢ኱ࡁ࠸ᆅ㟈ࢆࡼࡾከࡃᑐ㇟࡜ࡍࡿࡓࡵ㸪ࡇ࢚ࢿࣝࢠ࣮ࡢỈᖹ 2 ᡂศ࡬ࡢศᩓຠᯝࢆ⾲ࡍಀᩘ࡛࠶ࡾ㸪ࢀࡽࢆࢫࣛࣈෆᆅ㟈࡜ࡋ࡚ྲྀࡾᢅ࠺㸬Ỉᖹ 2 ᡂศࡢ⮬஌࿴ࡣ 1 ࡛࠶ࡿ㸬 ௨ୗࡢྛ❶࡛ࡣ㸪ࡲࡎ㸪␲ఝⅬ㟈※ࣔࢹࣝ࡜ࡑࢀ࡟ᇶ ࡇࡢࣔࢹ࡛ࣝࡣ㸪ᑐ㇟ᆅⅬ࡟࠾ࡅࡿࢧࣈ࢖࣋ࣥࢺ࠿ࡽ
- 46 -

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝ࡢ఩⨨㸪ᆅ㟈࣮࣓ࣔࣥࢺ㸪◚ቯ㛤ጞ᫬้㸪◚ቯఏ᧛㏿ᗘ㸪ࡢᆅ㟈ືࡢࣇ࣮࢚ࣜኚ᥮ࡣḟᘧ࡛୚࠼ࡽࢀࡿ㸬ࣛ࢖ࢬࢱ࢖࣒㸪㛗ࡉ᪉ྥࡢศ๭ᩘ㸪ᖜ᪉ྥࡢศ๭ᩘ㸪᫬ȁܵሺ݂ሻȁ ή ȁܲሺ݂ሻȁ ή ȁ‫ܩ‬ሺ݂ሻȁ ή ܱሺ݂ሻΤȁܱሺ݂ሻȁ௣㛫㍈᪉ྥࡢศ๭ᩘࡀࣔࢹࣝࣃ࣓ࣛࢱ࣮࡜ࡋ࡚ᚲせ࡛࠶ࡾ㸪

(2.2)ࣔࢹࣝࣃ࣓ࣛࢱ࣮ࡢಶᩘࡣ 16 Ns ࡜࡞ࡿ㸬ᚑࡗ࡚㸪᪤Ꮡࡇࡇ࡟ȁܲሺ݂ሻȁࡣఏ᧛⤒㊰≉ᛶ㸪ȁ‫ܩ‬ሺ݂ሻȁࡣᑐ㇟ᆅⅬࡢࢧ࢖ࢺࡢ≉ᛶ໬㟈※ࣔࢹࣝ࡜ẚ㍑ࡋ࡚㸪␲ఝⅬ㟈※ࣔࢹ࡛ࣝࡣ

ቑᖜ≉ᛶ㸪ܱሺ݂ሻࡣᑐ㇟ᆅⅬ࡛ᚓࡽࢀࡓ୰ᑠᆅ㟈グ㘓ࡢࣇࣔࢹࣝࣃ࣓ࣛࢱ࣮ࡢᩘࡀ኱ᖜ࡟ᑡ࡞ࡃ࡞ࡗ࡚࠸ࡿ࡜ゝ࠼࣮࢚ࣜኚ᥮㸪ȁܱሺ݂ሻȁ௣ ࡣࡑࡢ⤯ᑐ್࡟ Parzen ࢘࢖ࣥࢻ࢘ࢆ

ࡿ㸬㐺⏝ࡋ࡚ᖹ⁥໬ࢆ⾜ࡗࡓࡶࡢ࡛࠶ࡿ㸬ࡇࡇ࡟ Parzen ࢘࢖ࣥࢻ࢘ࡣᅉᯝᛶࢆ‶㊊ࡍࡿᆅ㟈ືࢆ⏕ᡂࡍࡿࡓࡵ࡟⏝࠸࡚࠸ࡿࡶࡢ࡛࠶ࡾ㸦㔝ὠ௚㸪2009㸧㸪ᮏ◊✲࡛ࡣࣂࣥࢻᖜ

ࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝

ࢆ 0.05 Hz ࡜ࡋࡓ㸬 ఏ᧛⤒㊰≉ᛶȁܲሺ݂ሻȁ࡜ࡋ࡚ࡣḟᘧ࡟♧ࡍࡼ࠺࡟ᗄఱῶ

 」ᩘࡢࢫࣛࣈෆᆅ㟈ࢆᑐ㇟࡟ୖ㏙ࡢ␲ఝⅬ㟈※ࣔࢹࣝ⾶࡜㠀ᙎᛶῶ⾶ࡢຠᯝࢆ⪃࠼ࡿ㸦Boore, 1983㸧㸬ࢆᵓ⠏ࡋ㸪ࡑࢀ࡟ࡼࡿᙉ㟈ືࡢ෌⌧ᛶࢆ᳨ウࡋࡓ㸬࡞࠾㸪␲ఝⅬ㟈※ࣔࢹࣝࡢᵓ⠏࡟࠶ࡓࡗ࡚ࡣ㸪ほ

ଵ

గ௙ோ

ோ

ொ௏ೞ

ȁܲሺ݂ሻȁ ൌ  ቀെ

ቁ

⤖ᯝࢆㄝ᫂

࡛ࡁࡿ⠊ᅖ࡛ࢧࣈ࢖࣋ࣥࢺࡢᩘࢆ࡛ࡁࡿࡔࡅᑡ࡞ࡃࡍࡿ

(2.3)

ࡇ࡜ࢆᚰࡀࡅࡓ㸬ࡇࡇ࡟ܴࡣࢧࣈ࢖࣋ࣥࢺ࠿ࡽᑐ㇟ᆅⅬࡲ࡛ࡢ㊥㞳㸪ܳࡣఏ ᖺ㔲㊰Ἀᆅ㟈᧛⤒㊰࡟࠾ࡅࡿ್࡛ܳ࠶ࡿ㸬ࢧ࢖ࢺቑᖜ≉ᛶȁ‫ܩ‬ሺ݂ሻȁ࡜ࡋ࡚

 1993 ᖺ㔲㊰Ἀᆅ㟈㸦Mw7.6㸧࡟ࡼࡿ㔲㊰ࡣᆅ㟈ほ⏣௚㸪1993㸧ࡣ㸪ࢫࣛࣈෆᆅ㟈࡟ࡼࡿグ㘓࠿ࡽồࡵࡽࢀࡿ⤒㦂ⓗࢧ࢖ࢺቑᖜ≉ᛶࢆࡢ⿕ᐖ㸦ୖ‴⿕ᐖ࡜ࡋ࡚ࡣ

⏝࠸ࡿࡇ࡜ࡀᮃࡲࡋࡃ㸪ᮏ◊✲࡛ࡣ≉࡟᩿ࡽ࡞࠸㝈ࡾ㔝᪤ ᭱኱つᶍࡢࡶࡢ࡛࠶ࡿ㸬ࡋࡓࡀࡗ࡚㸪ࢫࣛࣈෆᆅ㟈ὠ࣭㛗ᑿ㸦2005㸧࡟ࡼࡿ⤒㦂ⓗࢧ࢖ࢺቑᖜ≉ᛶࢆ⏝࠸ࡓ㸬࡟ᑐࡍࡿ␲ఝⅬ㟈※ࣔࢹࣝࡢ㐺⏝ᛶࢆᕤᏛⓗ❧ሙ࠿ࡽ᳨ ᘧ(2.2)࠿ࡽࢃ࠿ࡿࡼ࠺࡟㸪ࡇࡢࣔࢹ࡛ࣝࡣ㸪ࢧࣈ࢖࣋ウࡍࡿ࡟࠶ࡓࡾ㸪㔲㊰Ἀᆅ㟈࡟ࡼࡿ㔲㊰ࣥࢺ࠿ࡽࡢᆅ㟈ືࡢࣇ࣮࢚ࣜ᣺ᖜࡣ㟈※≉ᛶ࣭ఏ᧛⤒㊰ࡢ⛬ᗘㄝ࡛᫂ࡁࡿ࠿ࡣ㔜せ࡞╔┠Ⅼ࡛࠶ࡿ㸬≉ᛶ࣭ࢧ࢖ࢺ≉ᛶࡢ✚࡜ࡋ࡚୚࠼ࡽࢀࡿࡢ࡟ᑐࡋ㸪ࢧࣈ ࡇࢀࡲ࡛㔲㊰Ἀᆅ㟈ࢆᑐ㇟࡜ࡋࡓ㟈※ࣔࢹࣝ࡜ࡋ࡚ࡣ

࢖࣋ࣥࢺ࠿ࡽࡢᆅ㟈ືࡢࣇ࣮࢚ࣜ఩┦࡜ࡋ࡚ࡣ㸪ᑐ㇟ᆅ᳃ᕝ࣭➲㇂㸦2002㸧ࡢࡶࡢ㸪㔝ὠ㸦2004㸧ࡢࡶࡢ࡞࡝ࡀ

Ⅼ࡟࠾ࡅࡿ୰ᑠᆅ㟈グ㘓ࡢࣇ࣮࢚ࣜ఩┦ࡀࡑࡢࡲࡲ⏝࠸ᥦ᱌ࡉࢀ࡚࠸ࡿࡀ㸪ࡇࢀࡽࡢ㟈※ࣔࢹࣝࡣᦂࢀࡢ኱ࡁ࠿

ࡽࢀࡿ㸬ᑐ㇟ᆅⅬ࡛」ᩘࡢᆅ㟈ほグ㘓ࡀ฼⏝ྍ⬟࡛࠶ࡗࡓ㔲㊰ᕷෆࡢグ㘓ࢆ෌⌧࡛ࡁࡿࡼ࠺࡟タᐃࡉࢀࡓࡶࡢ

ࡿሙྜ࡟ࡣ㸪ධᑕゅ࠾ࡼࡧ back azimuth ࡜࠸࠺Ⅼ࡛㸪ᑐ࡛ࡣ࡞࠸㸬ࡑࡇ࡛㸪ࡇࡇ࡛ࡣ㸪㔲㊰ᕷෆࡢᙉ㟈ືࢆㄝ᫂㇟࡜ࡍࡿࢧࣈ࢖࣋ࣥࢺ࡜࡛ࡁࡿࡔࡅ㢮ఝࡋ࡚࠸ࡿࡶࡢࢆ

࡛ࡁࡿ␲ఝⅬ㟈※ࣔࢹࣝࡢసᡂࢆ┠ᣦࡋࡓ㸬⏝࠸ࡿࡇ࡜ࡀᮃࡲࡋ࠸㸬ࡑࢀ࡟ࡼࡾ㸪ሁ✚ᒙࡀᆅ㟈ືࡢ ࡲࡓ㸪ࡇࡢ᳨ウࢆࡍࡍࡵࡿ࡟࠶ࡓࡾ㸪㔲㊰Ἀᆅ㟈ࡢ㝿㸪ࡢᆅ㟈ືࢆ࡝

఩┦≉ᛶ࡟ཬࡰࡍᙳ㡪ࢆࡼࡾ㐺ษ࡟⪃៖࡛ࡁࡿࡓࡵ࡛࠶ࡿ㸬 ᘧ(2.2)ࢆࣇ࣮࢚ࣜ㏫ኚ᥮ࡍࡿࡇ࡜࡟ࡼࡾ㸪ࢧࣈ࢖࣋ࣥ
ࢺ࠿ࡽࡢᆅ㟈ືࡢ᫬้ṔἼᙧࡀồࡲࡿ㸬ࡉࡽ࡟㸪」ᩘࡢ
ࢧࣈ࢖࣋ࣥࢺ࠿ࡽࡢᆅ㟈ືࢆ㸪ࢧࣈ࢖࣋ࣥࢺࡢ┦ᑐⓗ࡞◚ቯ᫬้ࢆ⪃៖ࡋ࡚㔜ࡡྜࢃࡏࡿࡇ࡜࡟ࡼࡾ㸪ᆅ㟈ືࡢ඲యࡀィ⟬࡛ࡁࡿ㸬 ௨ୖࡢ㟈※ࣔࢹࣝ࡟࠾ࡅࡿࣔࢹࣝࣃ࣓ࣛࢱ࣮ࡣ㸪ྛࢧࣈ࢖࣋ࣥࢺࡢᮾ⤒㸪໭⦋㸪῝ࡉ㸪ᆅ㟈࣮࣓ࣔࣥࢺ㸪ࢥ࣮ࢼ࣮࿘Ἴᩘ㸪┦ᑐⓗ࡞◚ቯ᫬้࡛࠶ࡿ㸬ࢧࣈ࢖࣋ࣥࢺࡢ
ಶᩘࢆ Ns ࡜ࡍࢀࡤ㸪ࣔࢹࣝࣃ࣓ࣛࢱ࣮ࡢಶᩘࡣ 6 Ns ࡜࡞ࡿ㸬୍᪉㸪᪤Ꮡࡢ≉ᛶ໬㟈※ࣔࢹࣝࡢሙྜ㸪ࢧࣈ࢖࣋ࣥࢺẖ࡟㸪◚ቯ㛤ጞⅬࡢᮾ⤒㸪໭⦋㸪῝ࡉ㸪㉮ྥ㸪ഴᩳ㸪㛗ࡉ㸪ᖜ㸪◚ቯ㛤ጞⅬࡢ㛗ࡉ᪉ྥࡢ఩⨨㸪ྠࡌࡃᖜ᪉ྥ

ᅗ 㔲㊰-G ࡟࠾ࡅࡿࢧ࢖ࢺቑᖜ≉ᛶ- 47 -

㔝ὠ ཌ࣭㛗ᆏ 㝧௓⾲ 1993ᖺ㔲㊰Ἀᆅ㟈ࢆᑐ㇟࡜ࡋ࡚సᡂࡋࡓ␲ఝⅬ㟈※ࣔࢹࣝ
ᮾ⤒

໭⦋

῝ࡉ

ᆅ㟈࣮࣓ࣔࣥࢺ

ࢥ࣮ࢼ࣮࿘Ἴᩘ

◚ቯ᫬้

㸦ᗘ㸧

㸦ᗘ㸧

㸦km㸧

㸦Nm㸧

㸦Hz㸧

㸦s㸧

ࢧࣈ࢖࣋ࣥࢺ1

144.38142.921100.6

0.80E190.67

0.0ࢧࣈ࢖࣋ࣥࢺ2

144.26242.900100.6

1.80E190.67

6.0ᅗ ␲ఝⅬ㟈※ࣔࢹࣝ+᭷ຠᛂຊゎᯒ࡟ࡼࡿ㔲㊰-G㸪㔲㊰-GBࡢ㏿ᗘἼᙧ㸦0.2-2Hz㸧ࡢィ⟬⤖ᯝ࡜ほ⦪㍈㸸㏿ᗘ㸪ᶓ㍈㸸᫬㛫㸪㯮㸸ほ

⤖ᯝ

㸪㉥㸸ィ⟬

ᅗ ␲ఝⅬ㟈※ࣔࢹࣝ+᭷ຠᛂຊゎᯒ࡟ࡼࡿ㔲㊰-G㸪㔲㊰-GBࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝࡢィ⟬⤖ᯝ࡜ほ⤖ᯝ㸦ࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝࡣỈᖹ2ᡂศࡢ⮬஌࿴ᖹ᪉᰿࡟ࣂࣥࢻᖜ0.05HzࡢParzen࢘࢖ࣥࢻ࢘ࢆ㐺⏝ࡋࡓࡶࡢ㸧⦪㍈㸸ࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸪ᶓ㍈㸸࿘Ἴᩘ㸪㯮㸸ほ‴ᆅᇦᙉ㟈ほࡢほⅬ࡛࠶ࡿࠕ㔲㊰-Gࠖࡢᆅ┙࡛ࡣ㸪㉥㸸ィ⟬ຠᯝ㸦㔝ὠ࣭┒ᕝ㸪2003㸹㔝ὠ࣭Ⳣ㔝㸪2008㸧࡜ほⅬࢧ࢖ࢡࣜࢵࢡࣔࣅࣜࢸ࢕ࡀ⏕ࡌ࡚࠸ࡓ㸦Iai et al., 1995㸧┤ୗࡢᙉ࠸㠀⥺ᙧᣲືࡢ཮᪉ࢆ⪃៖ࡍࡿᡭἲ
㸦㔝ὠ㸪2007㸧࡜࠸࠺Ⅼ࡟ࡶὀពࢆᡶ࠺ᚲせࡀ࠶ࡿ㸬 ࡼࡗ࡚㸪ࡇࡇ࡛ࡣࢆ㐺⏝ࡋࡓ㸬࡞࠾㸪ࢧ࢖ࢡࣜࢵࢡࣔࣅࣜࢸ࢕࡜ࡣ୺࡟㣬ᆅ┙ࡢ㠀⥺ᙧᛶ࡟༑ศὀពࢆᡶ࠺ࡇ࡜࡜ࡋ㸪ከ㔜㠀⥺ᙧ࿴ࡋࡓᐦ࡞◁ᆅ┙࡟኱ࡁ࡞ࡏࢇ᩿ᛂຊࡀస⏝ࡋࡓሙྜ࡟
- 48 -

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝ṇࡢ dilatancy ࡢᙳ㡪࡟ࡼࡾ๛ᛶࡀᅇ᚟ࡍࡿ⌧㇟ࡢࡇ࡜࡛

ᕴ㸪2002㸧ࢆ⏝࠸ࡓ㸬ࢧ࢖ࢺቑᖜ≉ᛶ㸦ᘧ(2.2)ࡢȁ‫ܩ‬ሺ݂ሻȁ㸧࠶ࡿ㸬࡜ࡋ࡚ࡣ㸪㔲㊰-G ࡟࠾ࡅࡿࢧ࢖ࢺቑᖜ≉ᛶ㸦ᅗ㸧ࢆ

1993 ᖺ㔲㊰Ἀᆅ㟈ࢆᑐ㇟࡜ࡋ࡚సᡂࡋࡓ␲ఝⅬ㟈※ᕤᏛⓗᇶ┙ࡲ࡛ᘬࡁᡠࡋ࡚⏝࠸ࡓ㸬ࡲࡓ㸪఩┦≉ᛶ࡜ࡋࣔࢹࣝࡢࣃ࣓ࣛࢱࢆ⾲ ࡟♧ࡍ㸬㟈※ࣔࢹࣝࡢసᡂ࡟

࡚ࡣ㸪㔲㊰Ἀᆅ㟈ࡢ᭱኱వ㟈㸦1993 ᖺ 2 ᭶ 4 ᪥ 23:43㸧

࠶ࡓࡗ࡚ࡣ㸪㔲㊰Ἀᆅ㟈ࢆᑐ㇟࡟㐣ཤ࡟ᐇ᪋ࡋࡓἼᙧ࢖

ࡢ㔲㊰-G ࡛ࡢグ㘓ࢆᕤᏛⓗᇶ┙ࡲ࡛ᘬࡁᡠࡋ࡚⏝࠸ࡓ㸬ࣥࣂ࣮ࢪࣙࣥ㸦㔝ὠ㸪2007㸧ࡢ⤖ᯝࡶཧ⪃࡟ࡋࡓ㸬ࡑࡢከ㔜㠀⥺ᙧຠᯝࢆ⪃៖ࡍࡿࡓࡵ࡟ᚲせ࡜࡞ࡿ㠀⥺ᙧࣃࣛ⤖ᯝ࡟ࡼࡿ࡜㸪◚ቯ㛤ጞⅬࡼࡾࡶすഃ࡟኱ࡁ࡞ࡍ࡭ࡾࡀ

࣓ࢱࡢ್࡜ࡋ࡚ࡣ㸪᪤ ࡢ◊✲㸦㔝ὠ㸪2007㸧࡛Ȥ1=0.86㸪

⏕ࡌ࡚࠸ࡿ㡿ᇦࡀぢࡽࢀࡓ㸬ࡑࡇ࡛㸪◚ቯ㛤ጞⅬࡼࡾࡶ

Ȥ2=0.01 ࡀ᥎ᐃࡉࢀ࡚࠸ࡿࡢ࡛ࡇࢀࡽࡢ್ࢆ⏝࠸ࡓ㸬すഃࡢࢧࣈ࢖࣋ࣥࢺ㸦⾲ ࡢࢧࣈ࢖࣋ࣥࢺ 2㸧ࡢ◚ቯ ḟ࡟ᡭ㡰 2 ࡛ࡣ㔲㊰-G ࡢ⾲ᒙᆅ┙ࡢ᭷ຠᛂຊゎᯒ࡟ࡀ㔲㊰ࡢグ㘓ࡢ NS ᡂศ࡟ぢࡽࢀࡿ኱᣺ᖜࡢἼ㸦ᚋ㏙㸧

FLIP㸦Iai et al., 1992㸧ࢆ⏝࠸ࡓ㸬ࡑࡢ㝿ࡢᆅ┙ࣔࢹࣝ࡜ࢆࡶࡓࡽࡋࡓ࡜⪃࠼㸪ࡑࢀ࡟ඛ⾜ࡍࡿ◚ቯ㛤ጞⅬ௜㏆ࡢ

ࡋ࡚ࡣ㸪Iat et al. (1995)ࡢᆅ┙ࣔࢹࣝࢆࡉࡽ࡟ᨵⰋࡋࡓ㔝ࢧࣈ࢖࣋ࣥࢺ㸦⾲ ࡢࢧࣈ࢖࣋ࣥࢺ 1㸧ࡢ◚ቯࡀグ㘓ὠ㸦2007㸧ࡢᆅ┙ࣔࢹࣝ㸦⾲㸧ࢆ⏝࠸ࡓ㸬ࡢ๓༙㒊ศࡢἼࢆసࡾࡔࡋࡓ࡜⪃࠼㸪⾲ ࡟♧ࡍ㟈※௨ୖࡢ᪉ἲ࡛ィ⟬ࡉࢀࡓ㔲㊰-G㸦ᆅ⾲㸧㸪GB㸦ᆅ୰㸧ࣔࢹࣝࢆసᡂࡋࡓ㸬࡟࠾ࡅࡿᆅ㟈ືࢆほ ᆅ┙ࡢ㠀⥺ᙧᣲືࢆ⪃៖ࡋ࡚ᆅ㟈ືࢆィ⟬ࡍࡿᡭ㡰࡜ ࡛࠶ࡿ㸬ᅗ ࡣ㏿ᗘἼᙧࡢẚ㍑㸪ᅗ ࡣࣇ࣮ࡋ࡚ࡣ㸪ࡲࡎ㸪㔲㊰-G ࡢᕤᏛⓗᇶ┙࡟࠾ࡅࡿ 2E Ἴࢆ㸪࢚ࣜࢫ࣌ࢡࢺࣝࡢẚ㍑࡛࠶ࡿ㸬㏿ᗘἼᙧ࡜ࣇ࣮࢚ࣜࢫ࣌

ከ㔜㠀⥺ᙧຠᯝࢆ⪃៖ࡍࡿ᪉ἲ㸦㔝ὠ࣭┒ᕝ㸪2003㸹㔝

ࢡࢺࣝࡢ෌⌧ᛶࡣⰋዲ࡛࠶ࡿ࡜ุ᩿ࡉࢀࡿ㸬㏿ᗘἼᙧ࡛ὠ࣭Ⳣ㔝㸪2008㸧ࢆ⏝࠸࡚ィ⟬ࡋࡓ㸦ᡭ㡰 1㸧㸬࡞࠾㸪ᕤ

30s ௜㏆ࡢ኱᣺ᖜࡢἼࡀࢧࣈ࢖࣋ࣥࢺ 2 ࡢ◚ቯ࡟ࡼࡿࡶ

Ꮫⓗᇶ┙࡟࠾ࡅࡿ 2E Ἴ࡜ࡣ㸪௬࡟ᕤᏛⓗᇶ┙ࡀ㟢㢌ࡋࡢ࡛࠶ࡿ㸬࡚࠸ࡿሙྜ࡟ࡑࡢ⾲㠃࡛ほࡉࢀࡿ࡛࠶ࢁ࠺ᆅ㟈Ἴࡢࡇ⤖ᯝ࡜ẚ㍑ࡋࡓࡶࡢࡀᅗ㸪ᅗ࡜࡛࠶ࡿ㸦㔝ὠ㸪2018㸧㸬ḟ࡟㸪ࡇࡇ࡛ᚓࡽࢀࡓ 2E Ἴࢆ ᖺ᭶᪥ᐑᇛ┴໭㒊ࡢᆅ㟈ධຊ࡜ࡋ࡚⏝࠸ࡿࡇ࡜࡟ࡼࡾ㸪⾲ᒙᆅ┙࡟㛵ࡍࡿ᭷ຠᛂ

 2003ᖺ5᭶26᪥ᐑᇛ┴໭㒊ࡢᆅ㟈㸦Mw7.0㸧ࡣᒾᡭ┴࣭ᐑຊゎᯒࢆ⾜࠸㸪ᆅ⾲࠾ࡼࡧᆅ୰࡛ࡢᆅ㟈ືࢆィ⟬ࡋࡓ㸦ᡭᇛ┴ࡢ୍㒊࡟1000Galࢆ㉸࠼ࡿ㠀ᖖ࡟ᙉ࠸ᦂࢀࢆࡶࡓࡽࡋ

㡰 2㸧㸬௨ୗ㸪ࡑࢀࡒࢀࡢᡭ㡰࡟ࡘ࠸࡚㏙࡭ࡿ㸬ࡓᆅ㟈࡛࠶ࡾ㸪ᮾ໭᪂ᖿ⥺ࡢᶫ⬮࡟ࡶ⿕ᐖࢆࡶࡓࡽࡋࡓ㸬 ࡲࡎᡭ㡰 1 ࡛ᕤᏛⓗᇶ┙ࡢ 2E Ἴࢆィ⟬ࡍࡿ㝿㸪㟈※ ࡇࡢᆅ㟈࡟ࡘ࠸࡚ࡣࡍ࡛࡟ⱝ஭௚㸦2014㸧࡟ࡼࡾ␲ఝⅬᇦ࡟࠾ࡅࡿ፹㉁ࡢᐦᗘ࡜ S Ἴ㏿ᗘ㸦ᘧ(2.1)㸧ࡣ㸪Ide and㟈※ࣔࢹࣝࡢ᳨ウࡀ⾜ࢃࢀ࡚࠸ࡿ㸬ࡇࡇ࡛ࡣ㟈※㏆ഐ࡟࠾

Takeo (1996)ࡀ⏝࠸࡚࠸ࡿᆅୗᵓ㐀ࣔࢹࣝࡢ῝ࡉ 29km㹼

ࡅࡿἼᙧࡢ෌⌧ᛶ࡟╔┠ࡋ㸪ⱝ஭௚㸦2014㸧ࡢࣔࢹࣝ࡟ᑐ

100km ࡢ ⠊ ᅖ ࡟ ࠾ ࡅ ࡿ ್ ࡼ ࡾ Ȩ =3.3  103kg/m3 㸪ࡋⱝᖸಟṇࢆຍ࠼ࡓ㸬ࡑࡢ㝿㸪ⱝ஭௚㸦2014㸧ࡀᥦ᱌ࡋ࡚

Vs=4.6km/s ࡜ࡋࡓ㸬Ỉᖹ 2 ᡂศ࡬ࡢᆅ㟈Ἴ࢚ࢿࣝࢠ࣮ࡢ
ศ㓄ࢆ⾲ࡍಀᩘ࡛࠶ࡿܴܲܶ‫ࡣܰܶܫ‬㸪Ỉᖹ 2 ᡂศࡢ⮬஌࿴
ࡀ 1 ࡛࠶ࡿ࡜ࡢไ⣙᮲௳ࡢୗ࡛ほ⤖ᯝࢆㄝ᫂ࡋࡸࡍ࠸್ࢆタᐃࡍࡿࡇ࡜࡜ࡋ㸪EW ࢆ 0.53㸪NS ࢆ 0.85 ࡜ࡋࡓ㸬௨ୗ㸪ᮏ◊✲඲యࢆ㏻ࡌ㸪ܴܲܶ‫ࡢࡇࡣܰܶܫ‬᪉㔪࡛タᐃࡋࡓ㸬ఏ᧛⤒㊰࡟࠾ࡅࡿ್ܳ࡜ࡋ࡚ࡣܳ ൌ ͳͳͶ݂ ଴Ǥଽଶ㸦బ⸨࣭⾲ 㔲㊰-G ࡟࠾ࡅࡿ᭷ຠᛂຊゎᯒ⏝ࡢᆅ┙ࣔࢹࣝᒙཌ ᮦᩱᐦᗘึᮇ䛫䜣᩿๛ᛶ ᇶ‽᭷ຠᣊ᮰ᅽ ෆ㒊ᦶ᧿ゅ㻔㼙㻕㻔㼓㻛㼏㼙㻟㻕
㻔㼗㻼㼍㻕
㻔㼗㻼㼍㻕
㻔ᗘ㻕
㻞㻚㻜 ◁㉁ᅵ
㻝㻚㻡㻠㻝㻜㻢㻢㻜㻜㻟㻣㻠㻜㻣㻚㻜 ◁㉁ᅵ
㻝㻚㻣㻞㻝㻜㻢㻢㻜㻜
㻟㻣㻠㻜㻝㻠㻚㻜 ◁㉁ᅵ
㻝㻚㻥㻤㻞㻝㻜㻠㻜㻜㻥㻤㻠㻤㻥㻚㻜 ◁㉁ᅵ
㻝㻚㻣㻟㻝㻞㻝㻡㻜㻜㻝㻢㻠㻟㻣㻠㻚㻜 ◁㉁ᅵ
㻝㻚㻣㻢㻞㻜㻠㻣㻜㻜㻝㻥㻡㻠㻠㻤㻚㻜 ◁㉁ᅵ
㻝㻚㻣㻜㻝㻟㻥㻝㻜㻜㻞㻞㻠㻠㻠㻤㻚㻜 ◁㉁ᅵ
㻞㻚㻜㻜㻝㻤㻞㻠㻜㻜
㻞㻢㻥㻠㻡㻞㻡㻚㻜 ◁㉁ᅵ
㻝㻚㻣㻟㻞㻜㻝㻞㻜㻜㻟㻡㻠㻠㻠㻖➨㻞ᒙ䛸➨㻟ᒙ䛷䛿㐣๫㛫㝽Ỉᅽ䛾Ⓨ⏕䜢⪃៖䛧䛶䛚䜚䠈䛭䛾䝟䝷䝯䝍䛿䚷➨㻞ᒙ䛜ኚ┦ゅ㻞㻤ᗘ䠈㼃㻝㻩㻝㻞㻚㻜䠈㻼㻝㻩㻜㻚㻟䠈㻼㻞㻩㻜㻚㻟䠈㻯㻝㻩㻟㻚㻥㻣䠈㻿㻝㻩㻜㻚㻜㻝䠊䚷➨㻟ᒙ䛜ኚ┦ゅ㻞㻤ᗘ䠈㼃㻝㻩㻢㻚㻜䠈㻼㻝㻩㻜㻚㻟䠈㻼㻞㻩㻜㻚㻟䠈㻯㻝㻩㻟㻚㻢㻤䠈㻿㻝㻩㻜㻚㻜㻝䠊㻖䝺䞊䝺䞊ῶ⾶ᐃᩘ䃑䛿㻜㻚㻜㻜㻜㻡䠊ᅗ ᑐ㇟ほ Ⅼ㸦‫ڸ‬㸧࡜ࢧࣈ࢖࣋ࣥࢺ㸦۪㸧ࡢ఩⨨- 49 -

㔝ὠ ཌ࣭㛗ᆏ 㝧௓⾲ 2003ᖺ5᭶26᪥ᐑᇛ┴໭㒊ࡢᆅ㟈ࢆᑐ㇟࡜ࡋ࡚సᡂࡋࡓ␲ఝⅬ㟈※ࣔࢹࣝ
ᮾ⤒

໭⦋

῝ࡉ

ᆅ㟈࣮࣓ࣔࣥࢺ

ࢥ࣮ࢼ࣮࿘Ἴᩘ

◚ቯ᫬้

㸦ᗘ㸧

㸦ᗘ㸧

㸦km㸧

㸦Nm㸧

㸦Hz㸧

㸦s㸧

ࢧࣈ࢖࣋ࣥࢺ1

141.650

38.82072.0

0.60E190.65

0.0ࢧࣈ࢖࣋ࣥࢺ2

141.648

38.79372.0

0.15E191.30

1.2ࢧࣈ࢖࣋ࣥࢺ3

141.648

38.84778.0

1.20E190.40

4.0

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ᖜ0.05HzࡢParzen࢘࢖ࣥࢻ࢘ࢆ㐺⏝㸧ࡢィ⟬⤖ᯝ࡜ほ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸪ᶓ㍈㸸࿘Ἴᩘ㸪㯮㸸ほ䣋䣙䣖䢲䢲䢷

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䣈䣱䣷䣴䣫䣧䣴䢢䣕䣲䣧䣥䣶䣴䣷䣯䢢䢪䣉䣣䣮䢬䣵䢫䣈䣱䣷䣴䣫䣧䣴䢢䣕䣲䣧䣥䣶䣴䣷䣯䢢䢪䣉䣣䣮䢬䣵䢫䢶䣈䣱䣷䣴䣫䣧䣴䢢䣕䣲䣧䣥䣶䣴䣷䣯䢢䢪䣉䣣䣮䢬䣵䢫

䢳䢲䢲䢲

䢺
䢸

㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬䣈䣱䣷䣴䣫䣧䣴䢢䣕䣲䣧䣥䣶䣴䣷䣯䢢䢪䣉䣣䣮䢬䣵䢫䢳䢲䢲䢲⤖ᯝ㸬ᆅ┙ࡢ㠀⥺ᙧᣲືࢆ⪃៖ࡋ࡞࠸ሙྜ㸬⦪㍈㸸ࣇ

䢳
䢴

䢵

䢶 䢷 䢸

䢳

䢴

䢵 䢶 䢷 䢸䣈䣴䣧䣳䣷䣧䣰䣥䣻䢢䢪䣊䣼䢫䢳䢲䢴䢵 䢶 䢷 䢸䢳䢴䢵 䢶 䢷 䢸䢳䢲䣈䣴䣧䣳䣷䣧䣰䣥䣻䢢䢪䣊䣼䢫ᅗ ྛᆅࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸦Ỉᖹ2ᡂศࡢ⮬஌࿴ᖹ᪉᰿㸪ࣂࣥࢻᖜ0.05HzࡢParzen࢘࢖ࣥࢻ࢘ࢆ㐺⏝㸧ࡢィ⟬⤖ᯝ࡜ほ⤖ᯝ㸬IWT007㸪MYG001㸪MYG008㸪MYG010ࡢ4ᆅⅬ࡛ࡣᆅ┙ࡢ㠀⥺ᙧᣲືࢆ⪃៖㸬⦪㍈㸸ࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸪ᶓ㍈㸸࿘Ἴᩘ㸪㯮㸸ほ㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬

- 50 -

䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝

䢶
䢴
䢲
䢯䢴
䢯䢶
䢯䢸
䢯䢺

䣋䣙䣖䢲䢲䢷䢪䣇䣙䢫

䢢䣑䣤䣵䢰
䢢䣕䣻䣰䢰

䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫

䢲
䢳䢲

䢴䢲

䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫

䢶䢲

䢸䢲

䢺䢲

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䢯䢳䢲
䢴䢲

䣖䣫䣯䣧䢢䢪䣵䢫

䣋䣙䣖䣊䢴䢹䢪䣇䣙䢫

䢶
䢲
䢯䢶
䢯䢺

䢶

䢴䢲

䣖䣫䣯䣧䢢䢪䣵䢫

䣏䣛䣉䣊䢲䢵䢪䣇䣙䢫

䢴
䢲
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䢯䢶
䢯䢸
䢲
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䣖䣫䣯䣧䢢䢪䣵䢫

䣏䣛䣉䢲䢲䢳䢪䣇䣙䢫

䢷
䢲
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䢯䢳䢲
䢲

䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫䢺䢲䣋䣙䣖䢲䢲䢹䢪䣇䣙䢫

䢲

䢶

䢴䢲

䣖䣫䣯䣧䢢䢪䣵䢫

䣏䣛䣉䢲䢲䢵䢪䣇䣙䢫

䢴
䢲
䢯䢴
䢯䢶
䢯䢸
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䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫

䢸䢲

䢷

䢲

䢴䢲

䣖䣫䣯䣧䢢䢪䣵䢫

䣏䣛䣉䢲䢲䢺䢪䣇䣙䢫
䢷
䢲
䢯䢷

䢲

䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫䢶䢲䣖䣫䣯䣧䢢䢪䣵䢫

䢳䢷
䢳䢲
䢷
䢲
䢯䢷
䢯䢳䢲
䢯䢳䢷

䢴䢲

䣖䣫䣯䣧䢢䢪䣵䢫

䣏䣛䣉䢲䢳䢲䢪䣇䣙䢫䢲䢴䢲ᅗ ྛᆅࡢ㏿ᗘἼᙧ㸦0.2-2Hz㸧ࡢィ⟬⤖ᯝ࡜ほ䣖䣫䣯䣧䢢䢪䣵䢫

⤖ᯝ㸬IWT007㸪MYG001㸪MYG008㸪MYG010ࡢ4ᆅⅬ࡛ࡣᆅ┙ࡢ㠀⥺ᙧᣲືࢆ⪃៖㸬⦪㍈㸸㏿ᗘ㸪ᶓ㍈㸸᫬㛫㸪㯮㸸ほ- 51 -

㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝

࠸ࡿ3⟠ᡤࡢࢧࣈ࢖࣋ࣥࢺࡢ఩⨨࡜◚ቯ᫬้ࡣኚ࠼ࡎ㸪ᆅ⤖ᯝ࡜ほ㟈࣮࣓ࣔࣥࢺ࡜ࢥ࣮ࢼ࣮࿘Ἴᩘࡢࡳኚ᭦ࡋࡓ㸬ࡇ࡜ࡀ☜ㄆ࡛ࡁࡿ㸬ᅗ࡟ྛᆅࡢ㏿ᗘἼᙧ㸦0.2-2Hz㸧ࡢ ᅗ࡟ᑐ㇟ほィ⟬⤖ᯝࢆほⅬࢆ♧ࡍ㸬ࡇࢀࡽࡢᆅⅬ࡟࠾ࡅࡿᆅ㟈⤖ᯝࡢࣆ࣮ࢡ࿘Ἴᩘࡢࡎࢀࡀゎᾘࡉࢀ࡚࠸ࡿ
⤖ᯝ࡜ẚ㍑ࡋ࡚♧ࡍ㸬ᪧ໭ୖᕝἢ࠸࡛ሁ✚ືࡢ෌⌧ᛶࢆぢ࡞ࡀࡽ㟈※ࣃ࣓ࣛࢱࡢࢳ࣮ࣗࢽࣥࢢࢆ⾜ᒙࡢᙳ㡪ࡀᙉ࠸MYG010㸦▼ᕳ㸧ࢆ㝖ࡅࡤ㸪ྛᆅࡢ㏿ᗘἼࡗࡓ㸬⾲࡟タᐃࡋࡓ㟈※ࣃ࣓ࣛࢱࢆ♧ࡍ㸬㟈※ᇦ࡟࠾ᙧࡣᴫࡡ஧ࡘࡢ኱ࡁ࡞ࣃࣝࢫ࠿ࡽ࡞ࡿ㸬ࡇࢀࡽࡀ୺࡟ࢧࣈ

ࡅࡿ፹㉁ࡢᐦᗘ࡜SἼ㏿ᗘ㸦ᘧ(2.1)㸧ࡣ⚟ᒣ௚㸦1998㸧ࡼ࢖࣋ࣥࢺ1࡜ࢧࣈ࢖࣋ࣥࢺ3ࡢຠᯝ࡟ࡼࡗ࡚ㄝ᫂ࡉࢀ࡚࠸

ࡾȨ=3.2103kg/m3㸪Vs=4.46km/s࡜ࡋࡓ㸬ఏ᧛⤒㊰࡟࠾ࡅࡿ㸬ࡓࡔࡋ㸪ࡍ࡭࡚ࡢᆅⅬ࡛ࣃࣝࢫࡢ᣺ᖜࡀ࠺ࡲࡃ෌⌧ࡉࡿ್ܳ࡜ࡋ࡚ࡣܳ ൌ ͳͳͶ݂଴Ǥଽଶ㸦బ⸨࣭ᕴ㸪2002㸧ࢆ⏝࠸ࡓ㸬ࢀ࡚࠸ࡿࢃࡅ࡛ࡣ࡞࠸㸬≉࡟஧ࡘ┠ࡢࣃࣝࢫࡢ᣺ᖜࡣほ ᆅ㟈ືࡢィ⟬ࡣྛᆅⅬࡢᆅ⾲ࢆᑐ㇟࡜ࡋࡓ㸬ࡋࡓࡀࡗ࡚㸪࡛ࡣ༡࡟⾜ࡃ࡯࡝ᑠࡉࡃ࡞ࡗ࡚࠾ࡾ㸪ࡇࡢຠᯝࡀィ⟬࡛ࡣ

ྛᆅⅬ࡟࠾ࡅࡿᆅ⾲࡛ࡢࢧ࢖ࢺቑᖜ≉ᛶࢆ⏝࠸ࡓ㸬ࡲࡓ఩⾲⌧࡛ࡁ࡚࠸࡞࠸ࡢ࡛㸪༡ഃࡢほ┦≉ᛶࢆỴࡵࡿࡓࡵࡢ୰ᑠᆅ㟈ほグ㘓ࡶᆅ⾲ࡢࡶࡢࢆ

┠ࡢࣃࣝࢫ࡟㛵ࡋ࡚ࡣ㐣኱ホ౯࡜࡞ࡗ࡚࠸ࡿ㸬ࡇࡢⅬࡣ⌧⏝࠸ࡓ㸬౑⏝ࡋࡓグ㘓ࡣ2003ᖺ5᭶27᪥0:44ࡢᆅ㟈㸦M4.9㸧

᫬Ⅼ࡛ࡢ␲ఝⅬ㟈※ࣔࢹࣝࡢㄢ㢟࡛࠶ࡾ㸪௒ᚋ㸪ᣦྥᛶࡢࡢグ㘓࡛࠶ࡿ㸬ຠᯝࢆ␲ఝⅬ㟈※ࣔࢹࣝ࡟ྲྀࡾධࢀࡿࡓࡵ㸪᪉఩౫Ꮡᆺࡢ ᆅ㟈ືࢆィ⟬ࡍࡿ࡟࠶ࡓࡾ㸪࠸ࡃࡘ࠿ࡢᆅⅬ࡛ࡣᆅ┙ࡢࢥ࣮ࢼ࣮࿘Ἴᩘࢆྲྀࡾධࢀࡿ࡞࡝ࡢᕤኵࡀᚲせ࡛࠶ࡿ㸬㠀⥺ᙧᣲືࡢᙳ㡪ࡀぢࡽࢀࡓࡢ࡛㸪ࡇࢀࢆ⪃៖ࡋ࡚ᆅ㟈ືࢆィ⟬ࡋࡓ㸬ᆅ┙ࡢ㠀⥺ᙧᛶࢆ⪃៖ࡋࡓࡢࡣIWT007㸪 ᖺ᭶᪥ᐑᇛ┴ᮾ᪉Ἀࡢᆅ㟈

Ⅼ࡛ࡣィ⟬⤖ᯝࡣ஧ࡘ

MYG001㸪MYG008㸪MYG010ࡢ4ᆅⅬ࡛࠶ࡿ㸬ࡣࡌࡵ࡟㸪 2011ᖺ4᭶7᪥ᐑᇛ┴ᮾ᪉Ἀࡢᆅ㟈㸦Mw7.1㸧ࡣᐑᇛ┴ࡢࡇࢀࡽࡢᆅⅬ࡛ᆅ┙ࡢ㠀⥺ᙧᛶࢆ⪃៖ࡍࡿᚲせࡀ࠶ࡿࡇ୍㒊࡟1000Galࢆ㉸࠼ࡿ㠀ᖖ࡟ᙉ࠸ᦂࢀࢆࡶࡓࡽࡋࡓᆅ㟈࡜ࢆ᫂☜໬ࡍࡿࡓࡵ㸪ᆅ┙ࡢ㠀⥺ᙧᛶࢆ⪃៖ࡋ࡞࠸ሙྜࡢ

࡛࠶ࡿ㸬2011ᖺ3᭶11᪥࡟Ⓨ⏕ࡋࡓᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈⤖ᯝࢆࡇࢀࡽࡢᆅⅬ࡟㝈ᐃࡋ࡚♧ࡍ㸬ᅗࡣࡇࢀࡽࡢᆅ

ࡢవ㟈࡜ࡋ࡚ᢅࢃࢀ࡚࠸ࡿᆅ㟈࡛࠶ࡿࡀ㸪ỿࡳ㎸ࡴኴᖹὒⅬ࡛ᆅ┙ࡢ㠀⥺ᙧᛶࢆ⪃៖ࡏࡎ࡟ィ⟬ࡋࡓᆅ㟈ືࡢࣇ࣮ࣉ࣮ࣞࢺࡢෆ㒊࡛Ⓨ⏕ࡋࡓࢫࣛࣈෆᆅ㟈࡛࠶ࡿ㸦౛࠼ࡤẼ࢚ࣜࢫ࣌ࢡࢺࣝ࡜ᐇ㝿࡟ほࡉࢀࡓᆅ㟈ືࡢࣇ࣮࢚ࣜࢫ

㇟ᗇ㸪2011㸧㸬࣌ࢡࢺࣝࡢẚ㍑࡛࠶ࡿ㸬࠸ࡎࢀࡢᆅⅬ࡟࠾࠸࡚ࡶ㸪ィ⟬⤖ ࡇࡢᆅ㟈࡟ࡘ࠸࡚ࡣ᩿ᒙ㠃ୖ࡛ࡢࡍ࡭ࡾศᕸࢆ᫂ࡽ࠿ᯝࡼࡾほ⤖ᯝࡢ᪉ࡀࣆ࣮ࢡ࿘Ἴᩘࡀᕥഃ࡟࠶ࡿ㸬ࡇࢀࡣ࡟ࡍࡿࡓࡵࡢἼᙧ࢖ࣥࣂ࣮ࢪࣙࣥゎᯒࡀ」ᩘࡢ◊✲⪅࡟ᆅ┙ࡢ㠀⥺ᙧᣲືࡢᙳ㡪࡟ࡼࡾᆅ┙ࡢᅛ᭷࿘Ἴᩘࡀపୗ

ࡼࡾᐇ᪋ࡉࢀ࡚࠸ࡿ㸦౛࠼ࡤẼ㇟ᗇ㸪2011㸧㸬ࡑࡇ࡛㸪ࡇࡋࡓ⤖ᯝ࡛࠶ࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡑࡇ࡛㸪ࡇࢀࡽࡢᆅⅬ࡛ࡣ㸪ࡇ࡛ࡣ㸪Ẽ㇟ᗇ࡟ࡼࡿἼᙧ࢖ࣥࣂ࣮ࢪࣙࣥ⤖ᯝ࡛ࡍ࡭ࡾ㔞ከ㔜㠀⥺ᙧຠᯝࢆ⪃៖ࡍࡿ᪉ἲ㸦㔝ὠ࣭┒ᕝ㸪2003㸹㔝ὠ࣭ࡀ኱ࡁ࠸࡜᥎ᐃࡉࢀ࡚࠸ࡿ⠊ᅖ࡟㸪ᙉ㟈ືࢆㄝ᫂ࡍࡿࡢ࡟

Ⳣ㔝㸪2008㸧ࢆ⏝࠸࡚ᆅ㟈ືࢆィ⟬ࡋࡓ㸬ࡑࡢ㝿ᚲせ࡜࡞

ᚲせ࡞ಶᩘࡢⅬ㟈※ࢆ⨨ࡃࡇ࡜࡟ࡼࡾ␲ఝⅬ㟈※ࣔࢹࣝࡿࣃ࣓ࣛࢱ࡛࠶ࡿȤ1࡜Ȥ2ࡣ⾲ࡢࡼ࠺࡟タᐃࡋࡓ㸬Ȥ1ࡣᅗ࡟♧ࡍィ⟬⤖ᯝ࡜ほ⤖ᯝࡢࣆ࣮ࢡ࿘Ἴᩘࡢࡎ

ࢀ࡟ᇶ࡙࠸࡚タᐃࡋࡓ㸬Ȥ2ࡣᆅ㟈ືࡢᚋ⥆఩┦ࡢ᣺ᖜࡀጇᙜ࡞ࡶࡢ࡜࡞ࡿࡼ࠺࡟タᐃࡋࡓ㸬⾲ ྛᆅⅬ࡛⏝࠸ࡓ㠀⥺ᙧࣃ࣓ࣛࢱ
ᆅⅬ

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IWT007

0.80

0.005

MYG001

0.80

0.005

MYG008

0.90

0.005

MYG010

0.83

0.005

 ᅗ࡟ྛᆅࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝࡢィ⟬⤖ᯝࢆほ⤖ᯝ࡜ẚ㍑ࡋ࡚♧ࡍ㸬MYGH03࡛㧗࿘Ἴᡂศࡀ୙㊊ࡋ࡚࠸ࡿࡇ࡜ࢆ㝖ࡅࡤ㸪࠸ࡎࢀࡢᆅⅬ࡟࠾࠸࡚ࡶࣇ࣮࢚ࣜࢫ࣌ࢡ
ࢺࣝࡢࣆ࣮ࢡ࿘Ἴᩘࡸ඲య࡜ࡋ࡚ࡢ᣺ᖜࣞ࣋ࣝࡀⰋࡃ෌
ᅗ ᑐ㇟ほ Ⅼ㸦‫ڸ‬㸧࡜ࢧࣈ࢖࣋ࣥࢺ㸦۪㸧ࡢ఩⨨⌧ࡉࢀ࡚࠸ࡿ㸬㠀⥺ᙧࣃ࣓ࣛࢱࢆᑟධࡋࡓᆅⅬ࡛ࡣ㸪ィ⟬- 52 -

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝⾲ 2011 ᖺ 4 ᭶ 7 ᪥ᐑᇛ┴ᮾ᪉Ἀࡢᆅ㟈ࢆᑐ㇟࡜ࡋ࡚సᡂࡋࡓ␲ఝⅬ㟈※ࣔࢹࣝ
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ࢧࣈ࢖࣋ࣥࢺ1

141.926

38.29962.5

0.40E191.00

0.0ࢧࣈ࢖࣋ࣥࢺ2

141.90738.35459.3

0.40E191.00

2.8

ࢧࣈ࢖࣋ࣥࢺ3

141.958

38.36262.5

0.40E19

1.30

5.7

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)UHTXHQF\ +]MYG007㸪MYG010㸪MYG012㸪MYGH08㸪MYGH10ࡢ5ᆅⅬ࡛ࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸦Ỉᖹ2ᡂศࡢ⮬஌࿴ᖹ᪉᰿㸪ࣂࣥࢻᖜ0.05HzࡢParzen࢘࢖ࣥࢻ࢘ࢆ㐺⏝㸧ࡢィ⟬⤖ᯝ࡜ほྜ㸬⦪㍈㸸ࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸪ᶓ㍈㸸࿘Ἴᩘ㸪㯮㸸ほ⤖ᯝ㸬ᆅ┙ࡢ㠀⥺ᙧᣲືࢆ⪃៖ࡋ࡞࠸ሙ

㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬࣮࢚ࣜࢫ࣌ࢡࢺࣝẚ࡟ᇶ࡙ࡁ㸪⛣タᚋࡢࢧ࢖ࢺቑᖜ≉ᛶࢆࢆసᡂࡋࡓ㸬
Ⅼࢆ♧ࡍ㸬ࡇࢀࡽࡢᆅⅬ࡟࠾ࡅࡿᆅ㟈᪂ࡓ࡟ホ౯ࡋࡓ㸬ࡑࡢ㝿㸪MYG011࡜᮲௳ࢆᥞ࠼ࡿࡓࡵ㸪ືࡢ෌⌧ᛶࢆぢ࡞ࡀࡽ㟈※ࣃ࣓ࣛࢱࡢࢳ࣮ࣗࢽࣥࢢࢆ⾜

M5௨ୖM7ᮍ‶࠿ࡘ῝ࡉ60km௨ୗࡢグ㘓ࢆ⏝࠸ࡓ㸬఩┦≉ࡗࡓ㸬⾲࡟タᐃࡋࡓ㟈※ࣃ࣓ࣛࢱࢆ♧ࡍ㸬㟈※ᇦ࡟࠾ᛶࢆỴࡵࡿࡓࡵࡢ୰ᑠᆅ㟈ほ

ࡅࡿ፹㉁ࡢᐦᗘ࡜SἼ㏿ᗘ㸦ᘧ(2.1)㸧ࡣ⚟ᒣ௚㸦1998㸧ࡼࡀᆅ⾲ࡢᆅ㟈ື࡛࠶ࡿ࠿ࡽ㸪ᆅ⾲ࡢグ㘓ࢆ⏝࠸ࡓ㸬౑⏝ࡋࡾȨ=3.2103kg/m3㸪Vs=4.46km/s࡜ࡋࡓ㸬ఏ᧛⤒㊰࡟࠾ࡅࡓグ㘓ࡣ2011ᖺ7᭶13᪥0:37ࡢᆅ㟈㸦M5.1㸧ࡢグ㘓࡛࠶ࡿ㸬଴Ǥଽଶ㸦బ⸨࣭ᕴ㸪2002㸧ࢆ⏝࠸ࡓ㸬 ᆅ㟈ືࢆィ⟬ࡍࡿ࡟࠶ࡓࡾ㸪࠸ࡃࡘ࠿ࡢᆅⅬ࡛ࡣᆅ┙ࡢ ᅗ࡟ᑐ㇟ほࡿ್ܳ࡜ࡋ࡚ࡣܳ ൌ ͳͳͶ݂グ㘓࡟ࡘ࠸࡚ࡣ㸪ィ⟬ᑐ㇟ ᆅ㟈ືࡢィ⟬ࡣྛᆅⅬࡢᆅ⾲ࢆᑐ㇟࡜ࡋࡓ㸬ࡋࡓࡀࡗ࡚㸪
ྛᆅⅬ࡟࠾ࡅࡿᆅ⾲࡛ࡢࢧ࢖ࢺቑᖜ≉ᛶࢆ⏝࠸ࡓ㸬ࡑࡢ㝿㸪⾲ ྛᆅⅬ࡛⏝࠸ࡓ㠀⥺ᙧࣃ࣓ࣛࢱ

ᇶᮏⓗ࡟㔝ὠ࣭㛗ᑿ㸦2005㸧࡟ࡼࡿࢧ࢖ࢺቑᖜ≉ᛶࢆ⏝࠸

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ࡓࡀ㸪MYG011࡜MYG012ࡣ2004ᖺ1᭶࡟⛣タࡉࢀ࡚࠾ࡾ㸪

MYG007

0.70

0.005

⛣タᚋࡢࢧ࢖ࢺቑᖜ≉ᛶࡣ㔝ὠ࣭㛗ᑿ㸦2005㸧࡛ࡣホ౯ࡉ

MYG010

0.75

0.030

ࢀ࡚࠸࡞࠸㸬ࡑࡇ࡛㸪MYG011࡟ࡘ࠸࡚ࡣ㔝ὠ࣭ⱝ஭㸦2011㸧

MYG012

0.55

0.005

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MYGH08

0.90

0.005

MYGH10

0.85

0.005

MYG012࡟ࡘ࠸࡚ࡣ㸪‴ᆅᇦᙉ㟈ほࡢほⅬ࡛࠶ࡿࠕ௝ྎ-Gࠖ࡜⛣タᚋࡢMYG012࡛ྠ᫬࡟ᚓࡽࢀࡓグ㘓ࡢࣇ- 53 -

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䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬䢴䢲䢴䢲䣖䣫䣯䣧䢢䢪䣵䢫

䣏䣛䣉䢲䢲䢹䢪䣇䣙䢫

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ᅗ ྛᆅࡢ㏿ᗘἼᙧ㸦0.2-2Hz㸧ࡢィ⟬⤖ᯝ࡜ほ䣖䣫䣯䣧䢢䢪䣵䢫

⤖ᯝ㸬MYG007㸪MYG010㸪MYG012㸪MYGH08㸪MYGH10ࡢ5

ᆅⅬ࡛ࡣᆅ┙ࡢ㠀⥺ᙧᣲືࢆ⪃៖㸬⦪㍈㸸㏿ᗘ㸪ᶓ㍈㸸᫬㛫㸪㯮㸸ほ- 54 -

㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝䢶䢲䣏䣛䣉䢲䢳䢲䢪䣇䣙䢫

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䢺䣏䣛䣉䣊䢳䢲䢪䣇䣙䢫

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䣖䣫䣯䣧䢢䢪䣵䢫

ᅗ 㸦ࡘ࡙ࡁ㸧㠀⥺ᙧᣲືࡢᙳ㡪ࡀぢࡽࢀࡓࡢ࡛㸪ࡇࢀࢆ⪃៖ࡋ࡚ᆅ㟈ື

2003㸹㔝ὠ࣭Ⳣ㔝㸪2008㸧ࢆ⏝࠸࡚ᆅ㟈ືࢆィ⟬ࡋࡓ㸬ࡑࢆィ⟬ࡋࡓ㸬ᆅ┙ࡢ㠀⥺ᙧᛶࢆ⪃៖ࡋࡓࡢࡣMYG007㸪ࡢ㝿ᚲせ࡜࡞ࡿࣃ࣓ࣛࢱ࡛࠶ࡿȤ1࡜Ȥ2ࡣ⾲ࡢࡼ࠺࡟

MYG010㸪MYG012㸪MYGH08㸪MYGH10ࡢ5ᆅⅬ࡛࠶ࡿ㸬タᐃࡋࡓ㸬Ȥ1ࡣᅗ࡟♧ࡍィ⟬⤖ᯝ࡜ほࡣࡌࡵ࡟㸪ࡇࢀࡽࡢᆅⅬ࡛ᆅ┙ࡢ㠀⥺ᙧᛶࢆ⪃៖ࡍࡿᚲせࢡ࿘Ἴᩘࡢࡎࢀ࡟ᇶ࡙࠸࡚タᐃࡋࡓ㸬Ȥ2ࡣᆅ㟈ືࡢᚋ⥆ࡀ࠶ࡿࡇ࡜ࢆ᫂☜໬ࡍࡿࡓࡵ㸪ᆅ┙ࡢ㠀⥺ᙧᛶࢆ⪃៖ࡋ࡞఩┦ࡢ᣺ᖜࡀጇᙜ࡞ࡶࡢ࡜࡞ࡿࡼ࠺࡟タᐃࡋࡓ㸬⤖ᯝࡢࣆ࣮࠸ሙྜࡢ⤖ᯝࢆࡇࢀࡽࡢᆅⅬ࡟㝈ᐃࡋ࡚♧ࡍ㸬ᅗࡣࡇ

ᅗ࡟ྛᆅࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝࡢィ⟬⤖ᯝࢆほࢀࡽࡢᆅⅬ࡛ᆅ┙ࡢ㠀⥺ᙧᛶࢆ⪃៖ࡏࡎ࡟ィ⟬ࡋࡓᆅ㟈⤖ᯝ࡜ẚ㍑ࡋ࡚♧ࡍ㸬MYGH10࡛㧗࿘Ἴᡂศࡀ୙㊊ࡋ࡚࠸ືࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ࡜ᐇ㝿࡟ほࡿࡇ࡜ࢆ㝖ࡅࡤ㸪࠸ࡎࢀࡢᆅⅬ࡟࠾࠸࡚ࡶࣇ࣮࢚ࣜࢫ࣌ࢡ

ࡉࢀࡓᆅ㟈ືࡢࣇ

࣮࢚ࣜࢫ࣌ࢡࢺࣝࡢẚ㍑࡛࠶ࡿ㸬࠸ࡎࢀࡢᆅⅬ࡟࠾࠸࡚ࡶ㸪ࢺࣝࡢࣆ࣮ࢡ࿘Ἴᩘࡸ඲య࡜ࡋ࡚ࡢ᣺ᖜࣞ࣋ࣝࡀⰋࡃ෌

ィ⟬⤖ᯝࡼࡾほ⌧ࡉࢀ࡚࠸ࡿ㸬㠀⥺ᙧࣃ࣓ࣛࢱࢆᑟධࡋࡓᆅⅬ࡛ࡣ㸪ィ⟬⤖ᯝࡢ᪉ࡀࣆ࣮ࢡ࿘Ἴᩘࡀᕥഃ࡟࠶ࡿ㸬ࡇࢀࡣᆅ┙ࡢ㠀⥺ᙧᣲືࡢᙳ㡪࡟ࡼࡾᆅ┙ࡢᅛ᭷࿘Ἴᩘ⤖ᯝ࡜ほࡀపୗࡋࡓ⤖ᯝ࡛࠶ࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡑࡇ࡛㸪ࡇࢀࡽࡢᆅ

ࡇ࡜ࡀ☜ㄆ࡛ࡁࡿ㸬ᅗ࡟ྛᆅࡢ㏿ᗘἼᙧ㸦0.2-2Hz㸧

Ⅼ࡛ࡣ㸪ከ㔜㠀⥺ᙧຠᯝࢆ⪃៖ࡍࡿ᪉ἲ㸦㔝ὠ࣭┒ᕝ㸪ࡢィ⟬⤖ᯝࢆほ- 55 -⤖ᯝࡢࣆ࣮ࢡ࿘Ἴᩘࡢࡎࢀࡀゎᾘࡉࢀ࡚࠸ࡿ
⤖ᯝ࡜ẚ㍑ࡋ࡚♧ࡍ㸬᣺ᖜࡣMYG011࡛

㔝ὠ ཌ࣭㛗ᆏ 㝧௓ࡣ㐣኱ホ౯㸪MYG012࡛ࡣ㐣ᑠホ౯࡜࡞ࡗ࡚࠸ࡿࡀ㸪඲య࡜ࡋ࡚ࡳࢀࡤ㏿ᗘἼᙧࡣⰋዲ࡟෌⌧ࡉࢀ࡚࠸ࡿ㸬ᑐ㇟ほⅬࡢ୰࡛MYG003ࡣሁ✚ᒙࡢᙳ㡪ࡀ࡜ࡾࢃࡅᑠࡉ࠸࡜⪃࠼ࡽࢀࡿほほⅬ࡛࠶ࡿࡀ㸪ࡑࡇ࡛ࡣ᫂░࡞3ࡘࡢࣃࣝࢫࡀ

ࡉࢀ࡚࠾ࡾ㸪ࡑࢀࡽࡀࢧࣈ࢖࣋ࣥࢺ1㹼3࡟ࡼࡾㄝ᫂ࡉࢀ࡚࠸ࡿ㸬  ᖺ  ᭶  ᪥㥴Ἑ‴༡㒊ࡢᆅ㟈
 2009ᖺ8᭶11᪥㥴Ἑ‴༡㒊ࡢᆅ㟈㸦Mw6.2㸧ࡣᮾྡ㧗㏿㐨㊰ࡢ┒ᅵ➼࡟⿕ᐖࢆࡶࡓࡽࡋࡓᆅ㟈࡛࠶ࡿ㸦౛࠼ࡤᩧ⸨㸪2009㸧㸬ࡇࡢᆅ㟈࡟ࡘ࠸࡚ⴭ⪅ࡽࡣ᪤ ࡢ◊✲࡛᩿ᒙ㠃ୖ࡛ࡢࡍ࡭ࡾศᕸࢆ᫂ࡽ࠿࡟ࡍࡿࡓࡵࡢἼᙧ࢖ࣥࣂ࣮ࢪࣙࣥゎᯒ࡜≉ᛶ໬㟈※ࣔࢹࣝࡢసᡂࢆ⾜ࡗ࡚࠸ࡿ㸦㔝ὠ㸪2010a㸧㸬ᅗࡢ஧ࡘࡢ㛗᪉ᙧ㸦F1㸪F2㸧ࡀἼᙧ࢖ࣥࣂ࣮ࢪࣙࣥ
ᅗ ᑐ㇟ほゎᯒ࡟⏝࠸ࡓ᩿ᒙ㠃࡛࠶ࡾ㸪ᅗࡢࢥࣥࢱ࣮ࡀ᥎ᐃࡉ

Ⅼ㸦‫ڸ‬㸧࡜ࢧࣈ࢖࣋ࣥࢺ㸦۪㸧ࡢ఩⨨㸬ࢀࡓࡍ࡭ࡾ㔞ศᕸ࡛࠶ࡿ㸬ࡇࡢ⤖ᯝࢆࡶ࡜࡟㔝ὠ㸦2010a㸧

F1࡜F2ࡣἼᙧ࢖ࣥࣂ࣮ࢪࣙࣥゎᯒ㸦㔝ὠ㸪2010a㸧

࡛ࡣ᩿ᒙ㠃F1ୖ࡟஧ࡘ㸪᩿ᒙ㠃F2ୖ࡟୍ࡘ㸪ィ୕ࡘࡢ࢔ࢫ

࡟⏝࠸ࡓ᩿ᒙ㠃㸬࣌ࣜࢸ࢕࠿ࡽ࡞ࡿ≉ᛶ໬㟈※ࣔࢹࣝࢆసᡂࡋࡓ㸦ᅗ㸧㸬ᮏ◊✲࡛ࡣ㸪ࡇࢀࡽࡢ఩⨨ࢆཧ⪃࡟㸪3࠿ᡤࡢࢧࣈ࢖࣋ࣥ
ࢺ㸦ᅗ㸧࠿ࡽ࡞ࡿ␲ఝⅬ㟈※ࣔࢹࣝࢆసᡂࡋࡓ㸬ᮾ⤒࣭໭⦋࣭῝ࡉ௨እࡢ␲ఝⅬ㟈※ࣔࢹࣝࡢࣃ࣓ࣛࢱࡣ㸪ᅗ࡟♧ࡍほⅬ࡛ࡢᆅ㟈ືࡢ෌⌧ᛶࢆぢ࡞ࡀࡽࢳࣗ

࣮ࢽࣥࢢࢆ⾜ࡗࡓ㸬⾲࡟タᐃࡋࡓ㟈※ࣃ࣓ࣛࢱࢆ♧ࡍ㸬㟈※ᇦ࡟࠾ࡅࡿ፹㉁ࡢᐦᗘ࡜SἼ㏿ᗘ㸦ᘧ(2.1)㸧ࡣ୰ኸ㜵⅏఍㆟࡛ࡢ᳨ウ஦౛㸦୰ኸ㜵⅏఍㆟஦ົᒁ㸪2001㸧ࢆཧ⪃࡟Ȩ=2.8103kg/m3㸪Vs=3.82km/s࡜ࡋࡓ㸬ఏ᧛⤒㊰࡟࠾ࡅࡿ್ܳ࡜ࡋ࡚ࡣܳ ൌ ͳͳͶ݂ ଴Ǥଽଶ㸦బ⸨࣭ᕴ㸪2002㸧ࢆ⏝࠸ࡓ㸬 ᆅ㟈ືࡢィ⟬ࡣྛᆅⅬࡢᆅ⾲ࢆᑐ㇟࡜ࡋࡓ㸬ࡋࡓࡀࡗ࡚㸪
ྛᆅⅬ࡟࠾ࡅࡿᆅ⾲࡛ࡢࢧ࢖ࢺቑᖜ≉ᛶࢆ⏝࠸ࡓ㸬ࡲࡓ㸪఩┦≉ᛶࢆỴࡵࡿࡓࡵࡢ୰ᑠᆅ㟈ほグ㘓ࡶᆅ⾲ࡢࡶࡢ

ࢆ⏝࠸ࡓ㸬౑⏝ࡋࡓグ㘓ࡣᇶᮏⓗ࡟2009ᖺ8᭶13᪥12:42ࡢᅗ ஧ᯛࡢ᩿ᒙ㠃㸦F1㸪F2㸧ୖ࡛ࡢࡍ࡭ࡾศᕸࡢ᥎

ᆅ㟈㸦M4.3㸧ࡢグ㘓࡛࠶ࡿࡀ㸪ᚚ๓ᓮ-G࡛ࡣࡇࡢᆅ㟈ࡢグᐃ⤖ᯝ࡜≉ᛶ໬㟈※ࣔࢹࣝ㸦㔝ὠ㸪2010a㸧㸬ᕥ㘓ࡀᚓࡽࢀ࡚࠸࡞࠸ࡓࡵ㸪2000ᖺ9᭶11᪥7:49ࡢ᪂ᓥ௜㏆ࡢ

ࡀF1㸪ྑࡀF2㸬‫◚ࡣۻ‬ቯ㛤ጞⅬ㸪a࡜bࡣ≉࡟኱ᆅ㟈㸦M5.4㸧ࡢグ㘓ࢆ⏝࠸ࡓ㸬ࡁ࡞ࡍ࡭ࡾࡀ᥎ᐃࡉࢀࡓ⟠ᡤࢆ♧ࡍ㸬⾲ 2009 ᖺ 8 ᭶ 11 ᪥㥴Ἑ‴༡㒊ࡢᆅ㟈ࢆᑐ㇟࡜ࡋ࡚సᡂࡋࡓ␲ఝⅬ㟈※ࣔࢹࣝ
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138.492

34.76426.0

0.70E180.70

0.2ࢧࣈ࢖࣋ࣥࢺ3

138.466

34.82424.8

0.20E18

0.80

0.8- 56 -

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)UHTXHQF\ +]ᅗ ྛᆅࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸦Ỉᖹ2ᡂศࡢ⮬஌࿴ᖹ᪉᰿㸪ࣂࣥࢻᖜ0.05HzࡢParzen࢘࢖ࣥࢻ࢘ࢆ㐺⏝㸧ࡢィ⟬䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫⤖ᯝ࡜ほ䣕䣜䣑䢲䢳䢵䢪䣐䣕䢫
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䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫⤖ᯝ㸬⦪㍈㸸ࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸪ᶓ㍈㸸࿘Ἴᩘ㸪㯮㸸ほ䢴䢲䢶䢲䣖䣫䣯䣧䢢䢪䣵䢫

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ᅗ ྛᆅࡢ㏿ᗘἼᙧ㸦0.2-2Hz㸧ࡢィ⟬⤖ᯝ࡜ほ䢶䢲䣖䣫䣯䣧䢢䢪䣵䢫

䢸䢲⤖ᯝ㸬⦪㍈㸸㏿ᗘ㸪ᶓ㍈㸸᫬㛫㸪㯮㸸ほ- 57 -

䢺䢲㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫㔝ὠ ཌ࣭㛗ᆏ 㝧௓䢴䢲䣑䣯䣣䣧䣼䣣䣭䣫䢯䣉䢢䢪䣐䣕䢫

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䢺䢲ᅗ 㸦ࡘ࡙ࡁ㸧ᅗ࡟ྛᆅࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝࡢィ⟬⤖ᯝࢆほࡀ๓㟈࡜㢮ఝࡋ࡚࠸ࡿࡇ࡜ࢆ⪃៖ࡋ㸪2007ᖺ2᭶25᪥20:41⤖ᯝ࡜ẚ㍑ࡋ࡚♧ࡍ㸬SZO014࡛㧗࿘Ἴᡂศࡀ୙㊊ࡋ࡚࠸ࡢᆅ㟈㸦௨ᚋ㸪EGF࢖࣋ࣥࢺ࡜࿧ࡪ㸧ࡢグ㘓ࢆ⏝࠸ࡓ㸬࡞ࡿࡇ࡜ࡀ୺࡞┦㐪Ⅼ࡛࠶ࡿࡀ㸪඲య࡜ࡋ࡚ࣇ࣮࢚ࣜࢫ࣌ࢡ

࠾㸪EGF࢖࣋ࣥࢺ࡜ࡣ㸪ࢢ࣮ࣜࣥ㛵ᩘ࡜ࡋ࡚⏝࠸ࡿ୰ᑠᆅ

ࢺࣝࡣⰋࡃ෌⌧ࡉࢀ࡚࠸ࡿ㸬ᅗ࡟ྛᆅࡢ㏿ᗘἼᙧ㟈グ㘓ࢆࡶࡓࡽࡋࡓᆅ㟈ࡢࡇ࡜࡛࠶ࡿ㸬ࡇࡢᆅ㟈ࡢ㟈ኸࢆ

㸦0.2-2Hz㸧ࡢィ⟬⤖ᯝࢆほᅗ࡟㸪㟈※ࣃ࣓ࣛࢱࢆ⾲࡟♧ࡍ㸬⤖ᯝ࡜ẚ㍑ࡋ࡚♧ࡍ㸬SZO016㸪

SZO018㸪ᚚ๓ᓮ-G࡛ࡣ᣺ᖜࡢ኱ࡁ࠸ࣃࣝࢫ≧ࡢᆅ㟈ືࡀ ゎᯒࡢᑐ㇟࡜ࡍࡿほ

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Ⰻዲ࡟෌⌧ࡉࢀ࡚࠸ࡿ㸬Hzࡲ࡛༑ศ࡞S/Nẚࢆ᭷ࡋ࡚࠸ࡿほ♧ࡍ7ᆅⅬࢆ㑅ᐃࡋࡓ㸬ࡇࢀࡽࡢᆅⅬ࡛ࡢEWᡂศ࡜NSᡂ ᖺ᭶᪥⣖ఀ༙ᓥ༡ᮾἈࡢᆅ㟈ࡢ๓㟈

ศࡢ0.2-2Hzࡢ㏿ᗘἼᙧࢆ࢖ࣥࣂ࣮ࢪࣙࣥࡢࢱ࣮ࢤࢵࢺ࡜

 2004ᖺ9᭶5᪥⣖ఀ༙ᓥ༡ᮾἈࡢᆅ㟈ࡢ๓㟈㸦Mw7.2㸧ࡣ㸪ࡋࡓ㸬๓㟈ࡢグ㘓ࡢSἼࢆྵࡴ20⛊㛫ࢆゎᯒ࡟⏝࠸ࡓ㸬࡞

ᚋ㏙ࡢᮏ㟈㸦Mw7.5㸧࡜ྠᵝ㸪ỿࡳ㎸ࡴࣇ࢕ࣜࣆࣥᾏࣉࣞ

࠾KiK-netほⅬ࡛ࡣᆅ୰ࡢグ㘓ࢆ⏝࠸ࡓ㸬࣮ࢺࡢෆ㒊࡛⏕ࡌࡓᆅ㟈࡛࠶ࡾ㸦౛࠼ࡤPark and Mori,ゎᯒᑐ㇟࡛࠶ࡿ๓㟈ࡢ⣙5᫬㛫ᚋ࡟ࡣᮏ㟈ࡀⓎ⏕ࡋ࡚࠸

2005㸹Bai et al., 2007㸧㸪༡ᾏࢺࣛࣇࡢࡈࡃ㏆ഐ࡛⏕ࡌ࡚࠸ࡿ㸦ᅗ㸧㸬ࡑࡇ࡛㸪๓㟈ࡢⓎ⏕┤ᚋ࠿ࡽᮏ㟈ࡢⓎ⏕ࡿ㸬ࡇࢀࡲ࡛ᑐ㇟࡜ࡋ࡚ࡁࡓࢫࣛࣈෆᆅ㟈࡜ẚ㍑ࡋ࡚࠿࡞┤๓ࡲ࡛࡟Ⓨ⏕ࡋࡓᆅ㟈㸦M3.0௨ୖ㸧ࢆࣉࣟࢵࢺࡍࡿ࡜ᅗ

ࡾἈྜ࡛⏕ࡌ࡚࠸ࡿࡓࡵ㸦ᅗ㸧㸪୍⯡ⓗ࡞ᵓ㐀≀࡟⿕ࡢࢻࢵࢺࡢࡼ࠺࡟࡞ࡿ㸬ࡇࡢ⤖ᯝࢆぢࡿ࡜㸪๓㟈ࡢᐖࢆࡶࡓࡽࡍࡼ࠺࡞ᙉ࠸ᦂࢀࢆࡶࡓࡽࡋࡓᆅ㟈࡛ࡣ࡞࠸㟈ኸࢆ୰ᚰ࡟ᮾす20km⛬ᗘࡢ⠊ᅖ࡟㟈ኸࡀ㞟୰ࡋ࡚࠸ࡿ

ࡀ㸪㟈※఩⨨ࡀ༡ᾏࢺࣛࣇ࡟㏆࠸ࡇ࡜࠿ࡽ㸪ᙉ㟈ື◊✲ࡢ࡯࠿㸪๓㟈ࡢ35km࡯࡝ᮾ࡟ࡶ㟈ኸࡢ㞟୰ࡀぢࡽࢀࡿ㸬ᚋ⪅ศ㔝࡛ࡣ㔜どࡉࢀ࡚ࡁࡓᆅ㟈࡛࠶ࡾ㸪✀ࠎࡢᙉ㟈ືணᡭ࡟ࡘ࠸࡚ࡣ᪤ ࡢ◊✲㸦Park and Mori, 2005㸧࡛๓㟈ࡼࡾࡶἲࢆᑐ㇟࡜ࡋࡓ࣋ࣥࢳ࣐࣮ࢡࢸࢫࢺࡢᑐ㇟࡜ࡶ࡞ࡗࡓ㸦౛ࡴࡋࢁᮏ㟈࡜ࡢ㛵㐃ࡀᣦ᦬ࡉࢀ࡚࠸ࡿࡓࡵ㸪ࡇࡇ࡛ࡣ๓⪅࠼ࡤຍ⸨௚㸪2016㸧㸬

ࡢ⠊ᅖࢆཧ⪃࡟㸪Ẽ㇟ᗇࡢ㟈※㸦໭⦋33.032r㸪ᮾ⤒

136.797r㸪῝ࡉ38km㸧ࢆ୰ᚰ࡜ࡋ㸪㛗ࡉ20km㸪ᖜ10kmࡢ Ἴᙧ࢖ࣥࣂ࣮ࢪࣙࣥ ๓㟈࡟ࡘ࠸࡚ࡣ᪤࡟㐲ᆅᐇయἼࢆ⏝࠸ࡓࡍ࡭ࡾศᕸࡢ

᩿ᒙ㠃ࢆ௬ᐃࡋࡓ㸦ᅗࡢ㉥ࡢ◚⥺㸧㸬ࡇࡢᆅ㟈ࡢⓎ᥎ᐃ㸦ᒣ୰㸪2004㸹Park and Mori, 2005㸹Bai et al., 2007㸧⏕┤ᚋ࡟ᐇ᪋ࡉࢀࡓ㏿ሗⓗ࡞ゎᯒ㸦ᒣ୰㸪2004㸧࡛ࡣ༡ഴࡀ⾜ࢃࢀ࡚࠸ࡿ㸬ࡋ࠿ࡋ㸪ᙉ㟈ືࡢ⏕ᡂ࡜ࡼࡾ㛵ࢃࡾࡀ῝ᩳࡢ᩿ᒙ㠃ࡶ⏝࠸ࡽࢀ࡚࠸ࡓࡀ㸪ࡑࡢᚋࡢ◊✲㸦Park and࠸࡜⪃࠼ࡽࢀࡿࡍ࡭ࡾ㏿ᗘࡢศᕸ࡟ࡘ࠸࡚ࡣ༑ศ࡟ࡣㄪ

Mori, 2005㸹Bai et al., 2007㸧࡛ࡣ໭ഴᩳࡢ᩿ᒙ㠃ࡀࡼࡾ㐺࡭ࡽࢀ࡚࠸࡞࠸㸬ࡑࡇ࡛㸪๓㟈ࡢ㟈※᩿ᒙ㠃ୖ࡟࠾࠸࡚ࡍ

ษ࡜ࡉࢀ࡚࠾ࡾ㸪ࡇࡇ࡛ࡶ໭ഴᩳࡢ᩿ᒙ㠃ࢆ௬ᐃࡋࡓ㸬ල࡭ࡾ㔞࡜࡜ࡶ࡟ࡍ࡭ࡾ㏿ᗘࡢ኱ࡁ࠿ࡗࡓ㡿ᇦࢆ≉ᐃࡍࡿయⓗ࡟ࡣBai et al.㸦2007㸧࡟ᇶ࡙ࡁ㉮ྥ࡜ഴᩳࢆࡑࢀࡒࢀ

ࡓࡵ㸪⤒㦂ⓗࢢ࣮ࣜࣥ㛵ᩘࢆ⏝࠸ࡓἼᙧ࢖ࣥࣂ࣮ࢪࣙࣥ

280r㸪40r࡜ࡋࡓ㸬㸦㔝ὠ㸪2010b㸧ࢆᐇ᪋ࡋࡓ㸬ࢢ࣮ࣜࣥ㛵ᩘ࡜ࡋ࡚ࡣ㸪㟈※఩⨨㸪࣓࢝ࢽࢬ࣒㸪࠾ࡼࡧほ

20km10kmࡢ᩿ᒙࢆ2010ࡢᑠ᩿ᒙ࡟ศ๭ࡋ㸪ࡑࢀࡒࢀࡢᑠ᩿ᒙ࡛ࡢ࣮࣓ࣔࣥࢺ࣮ࣞࢺ㛵ᩘࡣEGF࢖࣋ࣥࢺࡢ

Ἴᙧࡢࣇ࣮࢚ࣜ఩┦≉ᛶ- 58 -

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝ᅗ Ἴᙧ࢖ࣥࣂ࣮ࢪࣙࣥࡢᑐ㇟࡜ࡋࡓ⣖ఀ༙ᓥ༡ᮾἈࡢᆅ㟈ࡢ๓㟈㸦M7.1㸧ࡢ㟈ኸ㸦‫ڦ‬㸧࠾ࡼࡧゎᯒୖ௬ᐃࡋࡓ㟈※᩿ᒙ㠃ࡢ⠊ᅖ㸦㉥ࡢ◚⥺㸧㸬㯮ࡢࢻࢵࢺࡣ๓㟈ࡢⓎ⏕┤ᚋ࠿ࡽᮏ㟈㸦M7.4㸧ࡢⓎ⏕┤๓ࡲ࡛ࡢM3.0௨ୖࡢᆅ㟈ࡢ㟈ኸ㸦Ẽ㇟ᗇ㸧㸪‫ࡣڦ‬ᮏ㟈ࡢ㟈ኸ㸪‫ࡣڧ‬EGF࢖࣋ࣥࢺࡢ㟈ኸ㸬‫ࡣڹ‬Ἴᙧ࢖ࣥࣂ࣮ࢪࣙࣥ࡟౑⏝ࡋࡓほ⾲ ๓㟈ࡢゎᯒ࡟⏝࠸ࡓᆅ㟈ࡢ㟈※᝟ሗ㸦* Bai et al. (2007) ** F-net ࡑࡢ௚ࡣẼ㇟ᗇࡢ᝟ሗ㸧
␒ྕ

ᖺ᭶᪥

᫬ศ

㟈ኸ఩⨨

῝ࡉ

つᶍ

㸦㉮ྥ, ഴᩳ, ࡍ࡭ࡾゅ㸧

EQ1

2004/9/5

19:07

୕㔜┴༡ᮾἈ

38km

M7.1

㸦280r, 40r, 104r㸧*EQ2

2004/9/10

11:05

୕㔜┴༡ᮾἈ

30km

M5.6

㸦255r, 64r, -42r㸧**EQ3

2007/2/25

20:41

୕㔜┴༡ᮾἈ

39km

M4.6

㸦269r, 50r, 96r㸧**ᅗ ࢖ࣥࣂ࣮ࢪࣙࣥࡢ⤖ᯝ࡜ࡋ࡚ᚓࡽࢀࡓ᭱⤊ࡍ࡭ࡾ㔞㸦ᕥ㸧࡜᭱኱ࡍ࡭ࡾ㏿ᗘ㸦ྑ㸧ࡢศᕸ㸦‫◚ࡣۻ‬ቯ㛤ጞⅬ㸻Ẽ㇟ᗇࡢ㟈※㸧

- 59 -

Ⅼ㸬䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫㔝ὠ ཌ࣭㛗ᆏ 㝧௓䢳䢰䢲䣃䣋䣅䣊䢲䢷䢪䣐䣕䢫

䢲䢰䢷
䢲䢰䢲

䢢䣑䣤䣵䢰
䢢䣕䣻䣰䢰

䢯䢲䢰䢷
䢯䢳䢰䢲

䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫䢲䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫

䢶䢲

䢴䢲

䢶䢲

䢴䢲

䢶䢲

䢴䢲

䢶䢲

䢸䢲

䢺䢲

䢳䢲䢲

䢳䢴䢲

䢸䢲

䢺䢲

䢳䢲䢲

䢳䢴䢲

䢸䢲

䢺䢲

䢳䢲䢲

䢳䢴䢲

䢸䢲

䢺䢲

䢳䢲䢲

䢳䢴䢲

䣖䣫䣯䣧䢢䢪䣵䢫

䣏䣋䣇䢲䢳䢶䢪䣇䣙䢫

䢲䢰䢷
䢲䢰䢲
䢯䢲䢰䢷

䢲

䢳䢰䢲

䣖䣫䣯䣧䢢䢪䣵䢫

䣙䣍䣛䢲䢲䢻䢪䣐䣕䢫

䢲䢰䢷
䢲䢰䢲
䢯䢲䢰䢷
䢯䢳䢰䢲
䢲

䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫䢴䢲䣖䣫䣯䣧䢢䢪䣵䢫

䣙䣍䣛䢲䢳䢲䢪䣐䣕䢫

䢲䢰䢶
䢲䢰䢲
䢯䢲䢰䢶
䢯䢲䢰䢺
䢲

ᅗ Ἴᙧ࢖ࣥࣂ࣮ࢪࣙࣥゎᯒ࡟࠾ࡅࡿほ䣖䣫䣯䣧䢢䢪䣵䢫

Ἴ㸦㯮㸧࡜ྜᡂἼ㸦㉥ࡲࡓࡣ⅊Ⰽ㸧ࡢẚ㍑㸦0.2-2Hzࡢ㏿ᗘἼᙧ㸧㸦ࣁࢵࢳࣥࢢ㒊ศࡀ࢖ࣥࣂ࣮ࢪࣙࣥ࡟౑⏝ࡋࡓ༊㛫㸧࣮࣓ࣔࣥࢺ࣮ࣞࢺ㛵ᩘ࡜࢖ࣥࣃࣝࢫิ࡜ࡢྜ✚࡛⾲ࡉࢀ࡟࠾࠸࡚ࡣࡇࡢⅬࢆཧ⪃࡟ࡋࡓ㸬ࡿ࡜ࡋ࡚ィ⟬ࢆ⾜ࡗ࡚࠸ࡿ㸬ࡇࡢ࢖ࣥࣃࣝࢫิࡣ0.125⛊㛫㝸ࡢ24ࡢ࢖ࣥࣃࣝࢫ࠿ࡽ࡞ࡿࡶࡢ࡜ࡋ㸪ྛ࢖ࣥࣃࣝࢫࡢ㧗 ๓㏙ࡢ⤖ᯝࢆ㋃ࡲ࠼࡚㸪๓㟈ࡢ␲ఝⅬ㟈※ࣔࢹࣝࡢసᡂ

ࡉࢆ࢖ࣥࣂ࣮ࢪࣙࣥࡢᮍ▱ᩘ࡜ࡋࡓ㸬◚ቯࣇࣟࣥࢺࡣẼ㇟ࢆ⾜ࡗࡓ㸬ᗇࡢ㟈※࠿ࡽྠᚰ෇≧࡟ᗈࡀࡿࡶࡢ࡜ࡋࡓ㸬㟈※௜㏆ࡢS ࡲࡎ㸪ࢧࣈ࢖࣋ࣥࢺࡢ఩⨨࡟ࡘ࠸࡚ࡣ㸪◚ቯ㛤ጞⅬ௜㏆

Ἴ㏿ᗘࡣᒣᮏ࣭ྜྷᮧ㸦2012㸧ࢆཧ⪃࡟4.7km/s࡜ࡋࡓ㸬㸦ᅗࡢ‫ۻ‬㸧࡜ࡑࡢࡸࡸᮾഃࡢ῝㒊㸦ᅗࡢ‫ۼ‬㸧࡟ ࡇࡢゎᯒ࡛ࡣᑠ᩿ᒙẖ㸪ࢱ࢖࣒࢘࢖ࣥࢻ࢘ẖࡢ࣮࣓ࣔࣥ

ࡍ࡭ࡾ㏿ᗘࡢ኱ࡁ࠸㡿ᇦࡀ࠶ࡿ࡜ࡢゎᯒ⤖ᯝࢆ㋃ࡲ࠼㸪ᅗ

ࢺࡀEGF࢖࣋ࣥࢺࡢ࣮࣓ࣔࣥࢺ࡟ᑐࡍࡿ┦ᑐ್࡜ࡋ࡚ồ࡟♧ࡍ2⟠ᡤ࡟ࢧࣈ࢖࣋ࣥࢺࢆタᐃࡋࡓ㸬ࡓࡔࡋ㸪㟈ࡲࡿ㸬ࡇࢀ࡟EGF࢖࣋ࣥࢺࡢ࣮࣓ࣔࣥࢺ㸦1.211016Nm㸧※ࡢ῝ࡉ࡟ࡘ࠸࡚ࡣ㸪Ẽ㇟ᗇࡢࡶࡢࡀ38km㸪ᒣ୰㸦2004㸧㸪㸦㜵⅏⛉Ꮫᢏ⾡◊✲ᡤF-net㸧ࢆ஌ࡌࡿࡇ࡜࡟ࡼࡾ㸪ᑠ᩿ᒙ

Park and Mori㸦2005㸧㸪Bai et al.㸦2007㸧ࡢࡶࡢࡀ15㹼20km

ẖ㸪ࢱ࢖࣒࢘࢖ࣥࢻ࢘ẖࡢ࣮࣓ࣔࣥࢺࢆồࡵ㸪ࡉࡽ࡟SἼ

࡜࡞ࡗ࡚࠾ࡾ㸪኱ࡁ࡞㝸ࡓࡾࡀ࠶ࡿ㸬ࡲࡓ㸪ඛ࡟ᐇ᪋ࡋࡓ

3

3

 ␲ఝⅬ㟈※ࣔࢹࣝࡢసᡂ

㏿ᗘ4.7km/s㸪ᐦᗘ3.210 kg/m ࢆ௬ᐃࡋ࡚㸦ᒣᮏ࣭ྜྷᮧ㸪Ἴᙧ࢖ࣥࣂ࣮ࢪ࡛ࣙࣥࡣẼ㇟ᗇࡢ㟈※఩⨨࡟ᑐࡍࡿ┦ᑐ

2012㸧㸪ᑠ᩿ᒙẖ㸪ࢱ࢖࣒࢘࢖ࣥࢻ࢘ẖࡢࡍ࡭ࡾ㔞ࢆồࡵⓗ࡞ࢧࣈ࢖࣋ࣥࢺࡢ఩⨨ࡀồࡲࡗ࡚࠸ࡿࡔࡅ࡛࠶ࡾ㸪ࢧࣈࡓ㸬࢖ࣥࣂ࣮ࢪࣙࣥࡢ⤖ᯝ࡜ࡋ࡚ᚓࡽࢀࡓ᭱⤊ࡍ࡭ࡾ㔞ࡢ࢖࣋ࣥࢺࡢ῝ࡉࢆᣊ᮰ࡍࡿ᝟ሗ࡜ࡣ࡞ࡗ࡚࠸࡞࠸㸬ࡇࡇ࡛ศᕸࢆᅗ㸦ᕥ㸧࡟㸪᭱኱ࡍ࡭ࡾ㏿ᗘࡢศᕸࢆᅗ

ࡣᒣ୰㸦2004㸧ࡢ್ࢆ᥇⏝ࡋ㸪ࢧࣈ࢖࣋ࣥࢺ1ࡢ῝ࡉࢆ15km㸪㸦ྑ㸧࡟♧ࡍ㸬ࡲࡓほἼ࡜ྜᡂἼࡢẚ㍑ࢆᅗ࡟♧ࡲࡓ㸪ࡑࢀ࡜ᩚྜࡉࡏࡿࡓࡵ㸪ࢧࣈ࢖࣋ࣥࢺ2ࡢ῝ࡉࢆࡍ㸬ᅗ࡟♧ࡍࡼ࠺࡟᭱⤊ࡍ࡭ࡾ㔞ࡢ኱ࡁ࠸㡿ᇦࡣ◚

16.3km࡜ࡋࡓ㸬ࢧࣈ࢖࣋ࣥࢺ2ࡢࢧࣈ࢖࣋ࣥࢺ1࡟ᑐࡍࡿ┦ቯ㛤ጞⅬ㸦‫ۻ‬㸧௜㏆࡟1⟠ᡤ࡟ࡲ࡜ࡲࡗ࡚⾲ࢀ࡚࠸ࡿ㸬ࡇᑐⓗ࡞◚ቯ᫬้ࡣ㸪๓❶ࡢ⤖ᯝ㸪࠾ࡼࡧᮏ❶ࡢࣇ࢛࣮࣡ࢻ

ࡢഴྥࡣ᪤ ࡢ◊✲㸦Park and Mori, 2005㸹Bai et al., 2007㸧ࣔࢹࣜࣥࢢࡢ⤖ᯝࢆ㋃ࡲ࠼6⛊ᚋ࡜ࡋࡓ㸬࡜ࡶᩚྜⓗ࡛࠶ࡿ㸬ࡋ࠿ࡋ㸪᭱኱ࡍ࡭ࡾ㏿ᗘࡢ኱ࡁ࠸㡿ᇦ ྛࢧࣈ࢖࣋ࣥࢺࡢᆅ㟈࣮࣓ࣔࣥࢺ࡜ࢥ࣮ࢼ࣮࿘Ἴᩘ࡟

ࡣ㸪◚ቯ㛤ጞⅬ௜㏆࡜㸪ࡑࡢࡸࡸᮾഃࡢ῝㒊㸦‫ۼ‬㸧࡟ศ࠿ࡘ࠸࡚ࡣ㸪ẚ㍑ⓗ㟈※࡟㏆࠸ᆅⅬ㸦ᅗࡢ7ᆅⅬ㸧࡛ࡢࢀ࡚Ꮡᅾࡋ࡚࠸ࡿࡼ࠺࡟ぢ࠼ࡿ㸬␲ఝⅬ㟈※ࣔࢹࣝࡢసᡂ

ᆅ㟈ືࡢ෌⌧ᛶࢆぢ࡞ࡀࡽࢳ࣮ࣗࢽࣥࢢࢆᐇ᪋ࡋࡓ㸬㟈※- 60 -

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝ᅗ ⣖ఀ༙ᓥἈࡢᆅ㟈ࡢ๓㟈㸦M7.1㸧ࡢ␲ఝⅬ㟈※ࣔࢹࣝ࡜఩┦≉ᛶࡢホ౯࡟⏝࠸ࡓ୰ᑠᆅ㟈ࡢ㟈ኸ㸦‫ڧ‬㸧۪ࡣ␲ఝⅬ㟈※ࣔࢹࣝࡢࢧࣈ࢖࣋ࣥࢺ㸬‫␲ࡣڹ‬ఝⅬ㟈※ࣔࢹࣝࡢタᐃ࡟౑⏝ࡋࡓほⅬ⾲ 2004 ᖺ 9 ᭶ 5 ᪥⣖ఀ༙ᓥ༡ᮾἈࡢᆅ㟈ࡢ๓㟈ࢆᑐ㇟࡜ࡋ࡚సᡂࡋࡓ␲ఝⅬ㟈※ࣔࢹࣝ
ᮾ⤒

໭⦋

῝ࡉ

ᆅ㟈࣮࣓ࣔࣥࢺ

ࢥ࣮ࢼ࣮࿘Ἴᩘ

◚ቯ᫬้

㸦ᗘ㸧

㸦ᗘ㸧

㸦km㸧

㸦Nm㸧

㸦Hz㸧

㸦s㸧

ࢧࣈ࢖࣋ࣥࢺ1

136.800

33.03015.0

1.60E190.15

0.0ࢧࣈ࢖࣋ࣥࢺ2

136.824

33.04016.3

0.12E19

1.20

6.0ᅗ ྛᆅࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸦Ỉᖹ2ᡂศࡢ⮬஌࿴ᖹ᪉᰿㸪ࣂࣥࢻᖜ0.05HzࡢParzen࢘࢖ࣥࢻ࢘ࢆ㐺⏝㸧ࡢィ⟬⤖ᯝ࡜ほ⤖ᯝ㸬⦪㍈㸸ࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ㸪ᶓ㍈㸸࿘Ἴᩘ㸪㯮㸸ほ- 61 -

㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬㔝ὠ ཌ࣭㛗ᆏ 㝧௓ᅗ ྛᆅࡢ㏿ᗘἼᙧ㸦0.2-1Hz㸧ࡢィ⟬⤖ᯝ࡜ほ⤖ᯝ㸬⦪㍈㸸㏿ᗘ㸪ᶓ㍈㸸᫬㛫㸪㯮㸸ほ- 62 -

㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝ᇦ࡟࠾ࡅࡿ፹㉁ࡢᐦᗘ࡜SἼ㏿ᗘ㸦ᘧ(2.1)㸧ࡣȨ=3.2

ࡣ᩿ᒙ㠃1Bࡢ◚ቯ㛤ጞࡢ㐜ࢀࢆ⪃៖ࡋࡓࡶࡢ࡛࠶ࡿ㸬㟈※

103kg/m3㸪Vs=4.7km/s࡜ࡋࡓ㸦ᒣᮏ࣭ྜྷᮧ㸪2012㸧㸬ఏ᧛௜㏆ࡢSἼ㏿ᗘࡣᒣᮏ࣭ྜྷᮧ㸦2012㸧ࢆཧ⪃࡟4.7km/s࡜ࡋ

⤒㊰࡟࠾ࡅࡿ್ܳ࡜ࡋ࡚ࡣܳ ൌ ͳͲͲ݂଴Ǥ଻଴ 㸦୰ኸ㜵⅏఍㆟஦ࡓ㸬ົᒁ㸪2001㸧ࢆ⏝࠸ࡓ㸬ᆅ㟈ືࡢィ⟬ࡣྛᆅⅬࡢᆅ⾲ࢆᑐ ࡇࡢゎᯒ࡛ࡣᑠ᩿ᒙẖ㸪ࢱ࢖࣒࢘࢖ࣥࢻ࢘ẖࡢ࣮࣓ࣔࣥ

㇟࡜ࡋࡓ㸬ࡋࡓࡀࡗ࡚㸪ྛᆅⅬ࡟࠾ࡅࡿᆅ⾲࡛ࡢࢧ࢖ࢺቑ

ࢺࡀEGF࢖࣋ࣥࢺࡢ࣮࣓ࣔࣥࢺ࡟ᑐࡍࡿ┦ᑐ್࡜ࡋ࡚ồᖜ≉ᛶࢆ⏝࠸ࡓ㸬ࡲࡓ㸪఩┦≉ᛶࢆỴࡵࡿࡓࡵࡢ୰ᑠᆅ㟈ࡲࡿ㸬ࡇࢀ࡟EGF࢖࣋ࣥࢺࡢ࣮࣓ࣔࣥࢺ㸦2.061017Nm㸧

ほグ㘓ࡶᆅ⾲ࡢࡶࡢࢆ⏝࠸ࡓ㸬౑⏝ࡋࡓグ㘓ࡣᇶᮏⓗ࡟㸦㜵⅏⛉Ꮫᢏ⾡◊✲ᡤF-net㸧ࢆ஌ࡌࡿࡇ࡜࡟ࡼࡾ㸪ᑠ᩿ᒙ

2007ᖺ2᭶25᪥ࡢᆅ㟈㸦⾲ࡢEQ3㸧ࡢグ㘓࡛࠶ࡿࡀ㸪ẖ㸪ࢱ࢖࣒࢘࢖ࣥࢻ࢘ẖࡢ࣮࣓ࣔࣥࢺࢆồࡵ㸪ࡉࡽ࡟SἼ

MIE012࡜MIE013࡛ࡣᙜヱᆅ㟈ࡢグ㘓ࡀᚓࡽࢀ࡚࠸࡞࠿ࡗ

㏿ᗘ4.7km/s㸪ᐦᗘ3.2103kg/m3ࢆ௬ᐃࡋ࡚㸦ᒣᮏ࣭ྜྷᮧ㸪ࡓࡓࡵ㸪2004ᖺ9᭶10᪥ࡢᆅ㟈㸦⾲ࡢEQ2㸧ࡢグ㘓ࢆ

2012㸧㸪ᑠ᩿ᒙẖ㸪ࢱ࢖࣒࢘࢖ࣥࢻ࢘ẖࡢࡍ࡭ࡾ㔞ࢆồࡵ⏝࠸ࡓ㸬ࡓ㸬࢖ࣥࣂ࣮ࢪࣙࣥࡢ⤖ᯝ࡜ࡋ࡚ᚓࡽࢀࡓ᭱⤊ࡍ࡭ࡾ㔞ࡢ タᐃࡋࡓ㟈※ࣃ࣓ࣛࢱࢆ⾲࡟ࡲ࡜ࡵ࡚♧ࡍ㸬ྛᆅࡢศᕸࢆᅗ㸦ᕥ㸧࡟㸪᭱኱ࡍ࡭ࡾ㏿ᗘࡢศᕸࢆᅗ

ࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ࡜㏿ᗘἼᙧࡢィ⟬⤖ᯝࢆほ㸦ྑ㸧࡟♧ࡍ㸬ࡲࡓほ⤖ᯝ࡜Ἴ࡜ྜᡂἼࡢẚ㍑ࢆᅗ࡟♧ẚ㍑ࡋࡓࡶࡢࢆᅗ࠾ࡼࡧᅗ࡟♧ࡍ㸬ࡇࢀࡽࡢᆅ

ࡍ㸬ᅗ࡟♧ࡍ⤖ᯝࡣ㸪᭱⤊ࡍ࡭ࡾ㔞࡜᭱኱ࡍ࡭ࡾ㏿Ⅼ࡟࠾ࡅࡿࢫ࣌ࢡࢺࣝ࠾ࡼࡧἼᙧࡣ㸪タᐃࡋࡓ㟈※ࣔࢹࣝᗘࡢ࡜ࡶ࡟኱ࡁ࠸㡿ᇦࡀ◚ቯ㛤ጞⅬ௜㏆࡟ຍ࠼᩿ᒙ㠃ࡢ࡟ࡼࡾୖᡭࡃㄝ࡛᫂ࡁ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬ᮾഃ㒊ศ࡟ࡶᏑᅾࡋ࡚࠸ࡓࡇ࡜ࢆ♧ࡋ࡚࠸ࡿ㸬ࡇࡢഴྥࡣ

 ᖺ᭶᪥⣖ఀ༙ᓥ༡ᮾἈࡢᆅ㟈ࡢᮏ㟈᪤ ࡢ◊✲㸦Park and Mori, 2005㸹Bai et al., 2007㸧ࡢഴྥᇦࡢ㐪࠸࡟ࡼࡿࡶࡢ࡜⪃࠼ࡽࢀࡿ㸬࡜␗࡞ࡿࡀ㸪౑⏝ࡋࡓࢹ࣮ࢱࡢ㐪࠸ࡶࡋࡃࡣᑐ㇟࿘Ἴᩘᖏ Ἴᙧ࢖ࣥࣂ࣮ࢪࣙࣥ ᮏ㟈࡟ࡘ࠸࡚ࡶ㸪㟈※᩿ᒙ㠃ୖ࡟࠾࠸࡚ࡍ࡭ࡾ㔞࡜࡜ࡶ ࡞࠾㸪ୖ㏙ࡢゎᯒ࡛ࡣศ๭ᩘࢆ2010࡜タᐃࡋࡓ⤖ᯝ㸪࡟ࡍ࡭ࡾ㏿ᗘࡢ኱ࡁ࠿ࡗࡓ㡿ᇦࢆ≉ᐃࡍࡿࡓࡵ㸪⤒㦂ⓗࢢᑠ᩿ᒙࢧ࢖ࢬࡣ๓㟈ࡼࡾ኱ࡁࡃ࡞ࡗ࡚࠸ࡿ㸬ศ๭ࢆࡼࡾ⣽࣮ࣜࣥ㛵ᩘࢆ⏝࠸ࡓἼᙧ࢖ࣥࣂ࣮ࢪࣙࣥ㸦㔝ὠ㸪2010b㸧

࠿ࡃࡍࡿ࡜㸪ࡍ࡭ࡾࡢ᫬✵㛫ศᕸࢆࡼࡾヲ⣽࡟ᢕᥱ࡛ࡁࡿ

ࢆᐇ᪋ࡋࡓ㸬ࢢ࣮ࣜࣥ㛵ᩘ࡜ࡋ࡚ࡣ㸪㟈※఩⨨㸪࣓࢝ࢽࢬྍ⬟ᛶࡀ࠶ࡿ㸬ࡋ࠿ࡋ㸪ࡇࡇ࡛ᚓࡽࢀࡓ⤖ᯝ࡟ᇶ࡙࠸࡚௨

࣒㸪࠾ࡼࡧほἼᙧࡢࣇ࣮࢚ࣜ఩┦≉ᛶࡀᮏ㟈࡜㢮ఝࡋ࡚ୗ࡟♧ࡍ࡜࠾ࡾ㐺ษ࡞␲ఝⅬ㟈※ࣔࢹࣝࢆタᐃ࡛ࡁ࡚࠸

࠸ࡿࡇ࡜ࢆ⪃៖ࡋ㸪2004ᖺ9᭶8᪥3:36ࡢᆅ㟈㸦௨ᚋ㸪EGF

ࡿࡢ࡛㸪┠ⓗ࡟ᑐࡋ࡚༑ศ࡞ゎᯒ࡟࡞ࡗ࡚࠸ࡿ࡜⪃࠼࡚࠸࢖࣋ࣥࢺ࡜࿧ࡪ㸧ࡢグ㘓ࢆ⏝࠸ࡓ㸬ࡇࡢᆅ㟈ࡢ㟈ኸࢆᅗࡿ㸬࡟㸪㟈※ࣃ࣓ࣛࢱࢆ⾲࡟♧ࡍ㸬 ゎᯒࡢᑐ㇟࡜ࡍࡿほ ๓㏙ࡢ⤖ᯝࢆ㋃ࡲ࠼࡚㸪ᮏ㟈ࡢ␲ఝⅬ㟈※ࣔࢹࣝࡢసᡂ

ࡀ࡜ࡶ࡟ほⅬ࡜ࡋ࡚ࡣ㸪ᮏ㟈࡜EGF࢖࣋ࣥࢺࡉࢀ࡚࠾ࡾ㸪ᑠᆅ㟈ࡢグ㘓ࡀప࿘Ἴഃ࡛0.2

 ␲ఝⅬ㟈※ࣔࢹࣝࡢసᡂ

ࢆ⾜ࡗࡓ㸬Ⅼ࡜ࡋ࡚ᅗ࡟ ࡲࡎ㸪ࢧࣈ࢖࣋ࣥࢺࡢ఩⨨࡟ࡘ࠸࡚ࡣ㸪◚ቯ㛤ጞⅬ௜㏆♧ࡍ6ᆅⅬࢆ㑅ᐃࡋࡓ㸬ࡇࢀࡽࡢᆅⅬ࡛ࡢEWᡂศ࡜NSᡂ㸦ᅗࡢ‫ۻ‬㸧࡜ࡑࢀࡼࡾᮾഃࡢ㒊ศ࡟ࡍ࡭ࡾ㏿ᗘࡢ኱ศࡢ0.2-2Hzࡢ㏿ᗘἼᙧࢆ࢖ࣥࣂ࣮ࢪࣙࣥࡢࢱ࣮ࢤࢵࢺ࡜

ࡁ࠸㡿ᇦࡀ࠶ࡿ࡜ࡢゎᯒ⤖ᯝࢆ㋃ࡲ࠼㸪ᅗ࡟♧ࡍ3⟠ࡋࡓ㸬ᮏ㟈ࡢグ㘓ࡢSἼࢆྵࡴ20⛊㛫ࢆゎᯒ࡟⏝࠸ࡓ㸬ᡤ࡟ࢧࣈ࢖࣋ࣥࢺࢆタᐃࡋࡓ㸬ࢧࣈ࢖࣋ࣥࢺࡢ῝ࡉࡣ㸪๓Hzࡲ࡛༑ศ࡞S/Nẚࢆ᭷ࡋ࡚࠸ࡿほゎᯒ࡟౑⏝ࡋࡓ᩿ᒙ㠃ࡣPark and Mori㸦2005㸧ࡢ᩿ᒙ㠃㟈࡜ྠᵝ࡟㸪Ẽ㇟ᗇࡢ㟈※᝟ሗࡼࡾࡶὸࡵ࡟タᐃࡋࡓ㸬

1B࡟┦ᙜࡍࡿ㸬ࡇࡇ࡛ࡣPark and Mori㸦2005㸧ࡢ◊✲ࢆཧ ྛࢧࣈ࢖࣋ࣥࢺࡢ┦ᑐⓗ࡞◚ቯ᫬้㸪ᆅ㟈࣮࣓ࣔࣥࢺ㸪⪃࡟㉮ྥ105r㸪ഴᩳ40r㸪㛗ࡉ40km㸪ᖜ20kmࡢ᩿ᒙ㠃ࢆࢥ࣮ࢼ࣮࿘Ἴᩘ࡟ࡘ࠸࡚ࡣ㸪ẚ㍑ⓗ㟈※࡟㏆࠸ᆅⅬ㸦ᅗ௬ᐃࡋࡓ㸦ᅗࡢ㉥ࡢ◚⥺㸧㸬ࡢ6ᆅⅬ㸧࡛ࡢᆅ㟈ືࡢ෌⌧ᛶࢆぢ࡞ࡀࡽࢳ࣮ࣗࢽࣥ

 40km20kmࡢ᩿ᒙࢆ2010ࡢᑠ᩿ᒙ࡟ศ๭ࡋ㸪ࡑࢀࡒࢢࢆᐇ᪋ࡋࡓ㸬㟈※ᇦ࡟࠾ࡅࡿ፹㉁ࡢᐦᗘ࡜SἼ㏿ᗘ㸦ᘧࢀࡢᑠ᩿ᒙ࡛ࡢ࣮࣓ࣔࣥࢺ࣮ࣞࢺ㛵ᩘࡣEGF࢖࣋ࣥࢺࡢ

(2.1)㸧ࡣȨ=3.2103kg/m3㸪Vs=4.7km/s࡜ࡋࡓ㸦ᒣᮏ࣭ྜྷᮧ㸪࣮࣓ࣔࣥࢺ࣮ࣞࢺ㛵ᩘ࡜࢖ࣥࣃࣝࢫิ࡜ࡢྜ✚࡛⾲ࡉࢀ

2012㸧㸬ఏ᧛⤒㊰࡟࠾ࡅࡿ್ܳ࡜ࡋ࡚ࡣܳ ൌ ͳͲͲ݂ ଴Ǥ଻଴ 㸦୰ࡿ࡜ࡋ࡚ィ⟬ࢆ⾜ࡗ࡚࠸ࡿ㸬ࡇࡢ࢖ࣥࣃࣝࢫิࡣ0.125⛊㛫ኸ㜵⅏఍㆟஦ົᒁ㸪2001㸧ࢆ⏝࠸ࡓ㸬ᆅ㟈ືࡢィ⟬ࡣྛᆅ㝸ࡢ24ࡢ࢖ࣥࣃࣝࢫ࠿ࡽ࡞ࡿࡶࡢ࡜ࡋ㸪ྛ࢖ࣥࣃࣝࢫࡢ㧗Ⅼࡢᆅ⾲ࢆᑐ㇟࡜ࡋࡓ㸬ࡋࡓࡀࡗ࡚㸪ྛᆅⅬ࡟࠾ࡅࡿᆅ⾲ࡉࢆ࢖ࣥࣂ࣮ࢪࣙࣥࡢᮍ▱ᩘ࡜ࡋࡓ㸬◚ቯࣇࣟࣥࢺࡣẼ㇟࡛ࡢࢧ࢖ࢺቑᖜ≉ᛶࢆ⏝࠸ࡓ㸬ࡲࡓ㸪఩┦≉ᛶࢆỴࡵࡿࡓᗇࡢ㟈※࠿ࡽྠᚰ෇≧࡟ᗈࡀࡿࡶࡢ࡜ࡋࡓ㸬ࡓࡔࡋྠᚰ෇

ࡵࡢ୰ᑠᆅ㟈ほࡢᣑ኱㛤ጞ᫬้ࡣẼ㇟ᗇࡢⓎ㟈᫬้ࡢ14sᚋ࡜ࡋࡓ㸬ࡇࢀ㘓ࡣ2004ᖺ9᭶8᪥3:36ࡢᆅ㟈㸦⾲ࡢEQ2㸧ࡢグ㘓࡛࠶- 63 -グ㘓ࡶᆅ⾲ࡢࡶࡢࢆ⏝࠸ࡓ㸬౑⏝ࡋࡓグ㔝ὠ ཌ࣭㛗ᆏ 㝧௓ᅗ Ἴᙧ࢖ࣥࣂ࣮ࢪࣙࣥࡢᑐ㇟࡜ࡋࡓ⣖ఀ༙ᓥ༡ᮾἈࡢᆅ㟈ࡢᮏ㟈㸦M7.4㸧ࡢ㟈ኸ㸦‫ڦ‬㸧࠾ࡼࡧゎᯒୖ௬ᐃࡋࡓ㟈※᩿ᒙ㠃ࡢ⠊ᅖ㸦㉥ࡢ◚⥺㸧㸬‫ࡣڦ‬๓㟈ࡢ㟈ኸ㸪‫ࡣڧ‬EGF࢖࣋ࣥࢺࡢ㟈ኸ㸬‫ࡣڹ‬Ἴᙧ࢖ࣥࣂ࣮ࢪࣙࣥ࡟౑⏝ࡋࡓほⅬ㸬⾲ ᮏ㟈ࡢゎᯒ࡟⏝࠸ࡓᆅ㟈ࡢ㟈※᝟ሗ㸦* F-net ࡑࡢ௚ࡣẼ㇟ᗇࡢ᝟ሗ㸧

␒ྕ

ᖺ᭶᪥

᫬ศ

㟈ኸ఩⨨

῝ࡉ

つᶍ

㸦㉮ྥ, ഴᩳ, ࡍ࡭ࡾゅ㸧

EQ1

2004/9/5

23:57

୕㔜┴༡ᮾἈ

44km

M7.4

㸦115r, 39r, 132r㸧*EQ2

2004/9/8

3:36

୕㔜┴༡ᮾἈ

40km

M5.5

㸦92r, 57r, 100r㸧*ᅗ ࢖ࣥࣂ࣮ࢪࣙࣥࡢ⤖ᯝ࡜ࡋ࡚ᚓࡽࢀࡓ᭱⤊ࡍ࡭ࡾ㔞㸦ᕥ㸧࡜᭱኱ࡍ࡭ࡾ㏿ᗘ㸦ྑ㸧ࡢศᕸ㸦‫◚ࡣۻ‬ቯ㛤ጞⅬ㸻Ẽ㇟ᗇࡢ㟈※㸧

- 64 -

䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝

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䢲

ᅗ Ἴᙧ࢖ࣥࣂ࣮ࢪࣙࣥゎᯒ࡟࠾ࡅࡿほ䣖䣫䣯䣧䢢䢪䣵䢫

Ἴ㸦㯮㸧࡜ྜᡂἼ㸦㉥ࡲࡓࡣ⅊Ⰽ㸧ࡢẚ㍑㸦0.2-2Hzࡢ㏿ᗘἼᙧ㸧㸦ࣁࢵࢳࣥࢢ㒊ศࡀ࢖ࣥࣂ࣮ࢪࣙࣥ࡟౑⏝ࡋࡓ༊㛫㸧- 65 -

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝ᅗ ⣖ఀ༙ᓥἈࡢᆅ㟈ࡢᮏ㟈㸦M7.4㸧ࡢ␲ఝⅬ㟈※ࣔࢹࣝ࡜఩┦≉ᛶࡢホ౯࡟⏝࠸ࡓ୰ᑠᆅ㟈ࡢ㟈ኸ㸦‫ڧ‬㸧۪ࡣ␲ఝⅬ㟈※ࣔࢹࣝࡢࢧࣈ࢖࣋ࣥࢺ㸬‫␲ࡣڹ‬ఝⅬ㟈※ࣔࢹࣝࡢタᐃ࡟౑⏝ࡋࡓほ

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㸪㉥ࡲࡓࡣ⅊Ⰽ㸸ィ⟬㸬䣘䣧䣮䣱䣥䣫䣶䣻䢢䢪䣥䣯䢱䣵䢫

␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝䢳䢰䢲䣏䣋䣇䢲䢳䢴䢪䣇䣙䢫

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ᅗ ྛᆅࡢ㏿ᗘἼᙧ㸦0.2-1Hz㸧ࡢィ⟬⤖ᯝ࡜ほ䣖䣫䣯䣧䢢䢪䣵䢫

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6.5

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 タᐃࡋࡓ㟈※ࣃ࣓ࣛࢱࢆ⾲࡟ࡲ࡜ࡵ࡚♧ࡍ㸬ྛᆅࡢࣇ࣮࢚ࣜࢫ࣌ࢡࢺࣝ࡜㏿ᗘἼᙧࡢィ⟬⤖ᯝࢆほ⤖ᯝ࡜ẚ㍑ࡋࡓࡶࡢࢆᅗ࠾ࡼࡧᅗ࡟♧ࡍ㸬ࡇࢀࡽࡢ
ᆅⅬ࡟࠾ࡅࡿࢫ࣌ࢡࢺࣝ࠾ࡼࡧἼᙧࡣ㸪タᐃࡋࡓ㟈※ࣔࢹ
ࣝ࡟ࡼࡾୖᡭࡃㄝ࡛᫂ࡁ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬- 67 -

㔝ὠ ཌ࣭㛗ᆏ 㝧௓㟈※ࣃ࣓ࣛࢱࡢ⤫ィⓗᛶ㉁

ࡘࡢࢫࣛࣈෆᆅ㟈࡟ຍ࠼㸪㛗ᆏ࣭㔝ὠ㸦2016㸧᳨࡛ウࡉࢀࡓ 2005 ᖺ 7 ᭶ 23 ᪥༓ⴥ┴୰㒊ࡢᆅ㟈㸦Mw5.9㸧ࡶ᳨ࡇࡇࡲ࡛」ᩘࡢࢫࣛࣈෆᆅ㟈ࢆᑐ㇟࡟␲ఝⅬ㟈※ࣔࢹ

ウᑐ㇟࡟ຍ࠼ࡓ㸬ࡲࡓ㸪▷࿘ᮇࣞ࣋ࣝࡢ⥲࿴ࡣ⮬஌࿴ᖹࣝࢆసᡂࡋᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࢆᐇ᪋ࡋ࡚ࡁࡓࡀ㸪᪉᰿࡜ࡋࡓ㸬

ࡑࡢ⤖ᯝ㸪࠸ࡎࢀࡢᆅ㟈࡟ᑐࡋ࡚ࡶࠊ㟈※ࣃ࣓ࣛࢱࡢタ ᅗ ᕥࡣࢧࣈ࢖࣋ࣥࢺࡢᆅ㟈࣮࣓ࣔࣥࢺࡢ⥲࿴㸦⦪ᐃࡀ㐺ษ࡛࠶ࢀࡤ㸪ᙉ㟈ືࢆᴫࡡⰋዲ࡟෌⌧࡛ࡁࡿࡇ࡜

㍈㸧࡜ᆅ㟈඲యࡢつᶍ㸦ᶓ㍈㸧࡜ࡢ㛵ಀࢆ♧ࡋࡓࡶࡢ࡛

ࡀ☜ㄆࡉࢀࡓ㸬ࡑࡇ࡛㸪ࡇࡇ࡛ࡣ㸪ಶࠎࡢᆅ㟈ࡢ෌⌧࡟࠶ࡿ㸬୸༳ࡣྛᆅ㟈࡟ᑐࡍࡿ␲ఝⅬ㟈※ࣔࢹࣝࡢࣃ࣓ࣛ

⏝࠸ࡓ㟈※ࣃ࣓ࣛࢱ࡜ᆅ㟈ࡢつᶍ࡜ࡢ㛵ಀ࡟ࡘ࠸᳨࡚ウࢱ࠿ࡽィ⟬ࡉࢀࡓ್࡛࠶ࡾ㸪⣽⥺ࡣᅇᖐᘧ࡛࠶ࡿ㸬࡞࠾㸪ࢆ⾜࠺㸬ᅇᖐᘧࢆồࡵࡿ㝿㸪୧ᑐᩘ㍈ୖ࡛ഴࡁࡀ 1 ࡛࠶ࡿࡇ࡜ࢆ

␲ఝⅬ㟈※ࣔࢹࣝ࡟㝈ࡽࡎ㸪୍⯡࡟ᙉ㟈ືࢩ࣑࣮ࣗࣞ

௬ᐃࡋࡓ㸬኱ᆅ㟈࡜ᑠᆅ㟈ࡀ┦ఝࡢ㛵ಀ࡟࠶ࡿሙྜࡣࡇ

ࢩ࡛ࣙࣥࡣ㸪࢔ࢫ࣌ࣜࢸ࢕➼ࡢࢧࣈ࢖࣋ࣥࢺࡀ⏕ᡂࡍࡿࡢࡼ࠺࡞㛵ಀ࡟࡞ࡾ㸪㟈※ࣃ࣓ࣛࢱࡢࢫࢣ࣮ࣜࣥࢢࢆ㆟ᆅ㟈ືࡢ㟈※ࢫ࣌ࢡࢺࣝࡣ࣓࢜࢞ࢫࢡ࢚࢔ࣔࢹࣝ㸦Aki,ㄽࡍࡿ࡜ࡁࡣࡇࡢࡼ࠺࡟௬ᐃࡍࡿࡇ࡜ࡀከ࠸㸬୍᪉㸪ᅗ

1967㸧࡟ᚑ࠺࡜௬ᐃࡍࡿࡇ࡜ࡀከ࠸㸬࣓࢜࢞ࢫࢡ࢚࢔ࣔ

 ᕥࡢኴ⥺ࡣ㸪ࢫࣛࣈෆᆅ㟈࡟ᑐࡍࡿ≉ᛶ໬㟈※ࣔࢹ

ࢹ࡛ࣝࡣ㸪㟈※ࢫ࣌ࢡࢺࣝࡢᙧ≧ࡣᅗ ࡢࡼ࠺࡟௬ᐃ

ࣝ࠿ࡽᚓࡽࢀࡓ➲㇂௚㸦2006㸧ࡢ⤒㦂ᘧ࡟┦ᙜࡍࡿࡶࡢ

ࡉࢀ㸪ᩘᘧࢆ⏝࠸ࡿ࡜ḟᘧࡢࡼ࠺࡟⾲⌧ࡉࢀࡿ㸬࡛࠶ࡿ㸬➲㇂௚㸦2006㸧ࡢ⤒㦂ᘧࡣᆅ㟈ࡢつᶍ࠿ࡽ▷࿘ᮇࣞ࣋ࣝ࡜࢔ࢫ࣌ࣜࢸ࢕㠃✚ࢆ୚࠼ࡿࡶࡢ࡛࠶ࡿࡀ㸪࢔‫ܦ‬ሺ݂ሻ ൌ ‫ܥ‬ܸሺ݂ሻ ൌ ‫ܥ‬‫ܣ‬ሺ݂ሻ ൌ ‫ܥ‬

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ଶగ௙

࣮࿘Ἴᩘࢆィ⟬ࡍࢀࡤ㸪ࡇࢀ࡜▷࿘ᮇࣞ࣋ࣝ࠿ࡽ࢔ࢫ࣌
ࣜࢸ࢕ࡢᆅ㟈࣮࣓ࣔࣥࢺࡀồࡲࡿ㸬ᅗ ᕥࡼࡾ㸪ᮏ◊(4.2)ସగఘ௏ೞ య ଵାሺ௙Τ௙೎ ሻమெబೌࢫ࣌ࣜࢸ࢕㠃✚࠿ࡽ Brune㸦1970㸪1971㸧ࡢᘧ࡛ࢥ࣮ࢼ

(4.1)

ସగఘ௏ೞ య ଵାሺ௙ Τ௙೎ ሻమሺଶగ௙ሻమ

✲࡛ᚓࡽࢀࡓᅇᖐᘧࡣ㸪➲㇂௚㸦2006㸧ࡢ⤒㦂ᘧ࡜ࡼࡃᩚྜࡋ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬(4.3)

ସగఘ௏ೞ య ଵାሺ௙Τ௙೎ ሻమ ୍᪉㸪ᅗ ྑࡣࢧࣈ࢖࣋ࣥࢺࡢ▷࿘ᮇࣞ࣋ࣝࡢ⥲࿴㸦⦪㍈㸧࡜ᆅ㟈඲యࡢつᶍ㸦ᶓ㍈㸧࡜ࡢ㛵ಀࢆ♧ࡋࡓࡶࡇࡇ࡟‫ܦ‬ሺ݂ሻࡣኚ఩㟈※ࢫ࣌ࢡࢺࣝ㸪 ܸሺ݂ሻࡣ㏿ᗘ㟈※ࢫࡢ࡛࠶ࡿ㸬୸༳ࡣྛᆅ㟈࡟ᑐࡍࡿ␲ఝⅬ㟈※ࣔࢹࣝࡢࣃ

࣌ࢡࢺࣝ㸪‫ܣ‬ሺ݂ሻࡣຍ㏿ᗘ㟈※ࢫ࣌ࢡࢺࣝ㸪‫ܯ‬଴௔ ࡣࢧࣈ࢖࣓ࣛࢱ࠿ࡽィ⟬ࡉࢀࡓ್࡛࠶ࡾ㸪⣽⥺ࡣᅇᖐᘧ࡛࠶ࡿ㸬࣋ࣥࢺࡢᆅ㟈࣮࣓ࣔࣥࢺ㸪݂௖ ࡣࢧࣈ࢖࣋ࣥࢺࡢࢥ࣮ࢼ࣮

࡞࠾㸪ᅇᖐᘧࢆồࡵࡿ㝿㸪୧ᑐᩘ㍈ୖ࡛ഴࡁࡀ 1/3 ࡛࠶࿘Ἴᩘ㸪‫ࡣܥ‬ᐃᩘ࡛࠶ࡿ㸬࠸ࡎࢀ࡟ࡋ࡚ࡶ㸪㟈※ࢫ࣌ࢡࡿࡇ࡜ࢆ௬ᐃࡋࡓ㸬኱ᆅ㟈࡜ᑠᆅ㟈ࡀ┦ఝࡢ㛵ಀ࡟࠶ࡿࢺࣝࡣࢧࣈ࢖࣋ࣥࢺࡢᆅ㟈࣮࣓ࣔࣥࢺ‫ܯ‬଴௔ ࡜ࢥ࣮ࢼ࣮࿘

ሙྜࡣࡇࡢࡼ࠺࡞㛵ಀ࡟࡞ࡾ㸪㟈※ࣃ࣓ࣛࢱࡢࢫࢣ࣮ࣜ

Ἴᩘ݂௖ ࡢ஧ࡘࡢࣃ࣓ࣛࢱ࡛つᐃࡉࢀࡿࡇ࡜ࡀࢃ࠿ࡿ㸬ࡇࣥࢢࢆ㆟ㄽࡍࡿ࡜ࡁࡣࡇࡢࡼ࠺࡟௬ᐃࡍࡿࡇ࡜ࡀከ࠸㸬ࡢࣔࢹࣝࡀᴟࡵ࡚᭷⏝࡛࠶ࡿࡇ࡜ࡣ㸪ᮏ◊✲ࡢ୍㐃ࡢゎ୍᪉㸪ᅗ ྑࡢኴ⥺ࡣ㸪ࢫࣛࣈෆᆅ㟈࡟ᑐࡍࡿ≉ᛶ໬ᯒ࡛ࡶᨵࡵ࡚☜ㄆࡍࡿࡇ࡜ࡀ࡛ࡁࡓ㸬

㟈※ࣔࢹࣝ࠿ࡽᚓࡽࢀࡓ➲㇂௚㸦2006㸧ࡢ⤒㦂ᘧ࡛࠶ࡿ㸬 ࡜ࡇࢁ࡛㸪ᘧ(4.1)ࡼࡾኚ఩㟈※ࢫ࣌ࢡࢺࣝࡢప࿘Ἴഃ

ᅗ ྑࡼࡾ㸪ᮏ◊✲࡛ᚓࡽࢀࡓᅇᖐᘧࡣ㸪➲㇂௚㸦2006㸧ଷࡢࣇࣛࢵࢺࣞ࣋ࣝࡣᐃᩘ൫‫ ܥ‬ΤͶߨߩܸ௦ ൯ࢆ㝖ࡅࡤ‫ܯ‬଴௔ ࡛࠶ࡿࡢ⤒㦂ᘧ࡜ࡼࡃᩚྜࡋ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬ࡢ࡟ᑐࡋ㸪ᘧ(4.3)ࡼࡾຍ㏿ᗘ㟈※ࢫ࣌ࢡࢺࣝࡢ㧗࿘Ἴഃࡢࣇࣛࢵࢺࣞ࣋ࣝࡣᐃᩘ൫‫ ܥ‬ΤͶߨߩܸ௦ ଷ ൯ࢆ㝖ࡅࡤ‫ܯ‬଴௔ ሺʹߨ݂௖ ሻଶ࡛࠶ࡿ㸬ᚋ⪅ࡢ್‫ܯ‬଴௔ ሺʹߨ݂௖ ሻଶ ࡣ▷࿘ᮇࣞ࣋ࣝ࡜࿧ࡤࢀ‫ܣ‬⤖ㄽ

࡜᭩࠿ࢀࡿࡇ࡜ࡀከ࠸㸬ࡇࢀࢆ⏝࠸ࡿ࡜㸪࣓࢜࢞ࢫࢡ࢚
࢔ࣔࢹࣝ࡟ᚑ࠺㟈※ࢫ࣌ࢡࢺࣝࡣࢧࣈ࢖࣋ࣥࢺࡢᆅ㟈ࣔ ᮏ◊✲࡛ᑐ㇟࡜ࡋࡓࢫࣛࣈෆᆅ㟈ࡣỿࡳ㎸ࡴᾏὒࣉࣞ

࣮࣓ࣥࢺ࡜▷࿘ᮇࣞ࣋ࣝࡢ஧ࡘࡢ㔞࡛つᐃ࡛ࡁࡿࡇ࡜࡟

࣮ࢺࡢෆ㒊࡛Ⓨ⏕ࡍࡿᆅ㟈࡛࠶ࡾ㸪ෆ㝣ᆅẆෆᆅ㟈ࡸࣉࣞ࡞ࡿ㸬ࡑࡇ࡛㸪㟈※ࣃ࣓ࣛࢱࡢ⤫ィⓗᛶ㉁ࢆ᳨ウࡍࡿ࡟࣮ࢺቃ⏺ᆅ㟈࡜␗࡞ࡿࢱ࢖ࣉࡢᆅ㟈࡛࠶ࡿ㸬㏆ᖺ㸪㤳㒔┤࠶ࡓࡾ㸪ࡇࢀࡽ࡟ࡘ࠸࡚㆟ㄽࡍࡿࡇ࡜ࡀ᭷⏝࡛࠶ࡿ㸬ୗ࡛ࡢ኱つᶍ࡞ࢫࣛࣈෆᆅ㟈ࡢⓎ⏕ࡀᠱᛕࡉࢀࡿ࡞࡝㸪ࢫ ࡑࡇ࡛㸪ࡇࡇ࡛ࡣ㸪ᆅ㟈ẖ࡟ࠕࢧࣈ࢖࣋ࣥࢺࡢᆅ㟈ࣔࣛࣈෆᆅ㟈࡟ᑐࡍࡿᙉ㟈ືண࣮࣓ࣥࢺࡢྜィࠖ࡜ࠕࢧࣈ࢖࣋ࣥࢺࡢ▷࿘ᮇࣞ࣋ࣝࡢྜ ⌧ᅾ㸪ᐇ⏝ⓗ࡞ᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࡓࡵࡢ㟈※ィࠖࢆィ⟬ࡋ㸪ࡇࢀࡽ࡜ᆅ㟈඲యࡢ࣮࣓ࣔࣥࢺ࡜ࡢ㛵ಀࣔࢹࣝ࡜ࡋ࡚ࡣ㸪᩿ᒙ㠃ୖ࡟▴ᙧࡢ࢔ࢫ࣌ࣜࢸ࢕ࢆ⨨࠸ࢆ᳨ウࡍࡿࡇ࡜࡜ࡋࡓ㸬ࡑࡢ㝿㸪ᮏ◊✲࡛ᑐ㇟࡜ࡋࡓ 6ࡓ≉ᛶ໬㟈※ࣔࢹࣝࡀ⏝࠸ࡽࢀࡿࡇ࡜ࡀከ࠸ࡢ࡟ᑐࡋ㸪- 68 -ࡢ㔜せᛶࡀ㧗ࡲࡗ࡚࠸ࡿ㸬␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩࣙࣥࡢࢫࣛࣈෆᆅ㟈࡬ࡢ㐺⏝ᅗ ࣓࢜࢞ࢫࢡ࢚࢔ࣔࢹࣝ࡟ᚑ࠺㟈※ࢫ࣌ࢡࢺࣝ㸬ᕥ࠿ࡽ㡰࡟ኚ఩࣭㏿ᗘ࣭ຍ㏿ᗘࡢ㟈※ࢫ࣌ࢡࢺࣝ㸬ᅗ 㸦ᕥ㸧ࢧࣈ࢖࣋ࣥࢺࡢᆅ㟈࣮࣓ࣔࣥࢺࡢ⥲࿴㸦⦪㍈㸧࡜ᆅ㟈඲యࡢつᶍ㸦ᶓ㍈㸧࡜ࡢ㛵ಀ㸬㸦ྑ㸧ࢧࣈ࢖࣋ࣥࢺࡢ
▷࿘ᮇࣞ࣋ࣝࡢ⥲࿴㸦⦪㍈㸧࡜ᆅ㟈඲యࡢつᶍ㸦ᶓ㍈㸧࡜ࡢ㛵ಀ㸬୸༳ࡣಶࠎࡢᆅ㟈࡟ᑐࡍࡿ␲ఝⅬ㟈※ࣔࢹࣝࡢࣃ࣓ࣛࢱ࠿ࡽィ⟬ࡉࢀࡓ್㸬⣽⥺ࡣᅇᖐᘧ㸬ኴ⥺ࡣ➲㇂௚㸦2006㸧ࡢᥦ᱌ᘧ㸬ⴭ⪅ࡽࡣࡇࢀࢆ኱ᖜ࡟༢⣧໬ࡋࡓ␲ఝⅬ㟈※ࣔࢹࣝࢆᥦ

ᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈࡞࡝࡬ࡢ㐺⏝ᛶࡀ☜ㄆࡉࢀ࡚࠸ࡿ

᱌ࡋ࡚࠸ࡿ㸬␲ఝⅬ㟈※ࣔࢹ࡛ࣝࡣ㸪ᙉ㟈ືࢆ⏕ᡂࡍࡿ1ࡀ㸪ࢫࣛࣈෆᆅ㟈࡟ᑐࡋ࡚ࡣ୍㒊ࡢᆅ㟈ࢆ㝖ࡁ㐺⏝ᛶࡢ☜ࡘࡲࡓࡣ」ᩘࡢࢧࣈ࢖࣋ࣥࢺࡀ᩿ᒙ㠃ୖ࡟࠶ࡿ࡜⪃࠼ࡿ㸬ㄆࡀ࡞ࡉࢀ࡚࠸࡞࠿ࡗࡓ㸬ࡑࡇ࡛ᮏ◊✲࡛ࡣ㸪㏆ᖺࢃࡀᅜࡑࡋ࡚㸪ྛࠎࡢࢧࣈ࢖࣋ࣥࢺ࡟ᑐࡋ㸪ࡑࡢෆ㒊࡟࠾ࡅࡿࡍ

࿘㎶࡛Ⓨ⏕ࡋᙉ㟈グ㘓ࡶᚓࡽࢀ࡚࠸ࡿ6ࡘࡢ኱つᶍ࡞ࢫࣛ࡭ࡾࡢ᫬✵㛫ศᕸࢆヲ⣽࡟ࡣࣔࢹࣝ໬ࡏࡎ㸪ྛࠎࡢࢧࣈ࢖

ࣈෆᆅ㟈ࢆᑐ㇟࡟㸪ᐇ㝿࡟␲ఝⅬ㟈※ࣔࢹࣝࢆᵓ⠏ࡋ㸪ࡑ࣋ࣥࢺࡀ⏕ᡂࡍࡿ㟈※ࢫ࣌ࢡࢺࣝࡢࡳࢆࣔࢹࣝ໬ࡍࡿ㸬ࡇࢀ࡟ࡼࡿᙉ㟈ືࡢ෌⌧ᛶࢆ᳨ウࡋࡓ㸬ࢀ࡟ࡼࡾ㸪㟈※ࣃ࣓ࣛࢱࡢᩘࢆ኱ᖜ࡟ῶࡽࡍࡇ࡜࡟ᡂຌࡋ

᳨ウࡢ⤖ᯝ㸪࠸ࡎࢀࡢᆅ㟈࡟ᑐࡋ࡚ࡶࠊ㟈※ࣃ࣓ࣛࢱ࡚࠸ࡿ㸬ࡢタᐃࡀ㐺ษ࡛࠶ࢀࡤ㸪␲ఝⅬ㟈※ࣔࢹࣝ࡟ࡼࡾ㟈※࿘ ␲ఝⅬ㟈※ࣔࢹࣝࡣ㸪ࡇࢀࡲ࡛ࣉ࣮ࣞࢺቃ⏺ᆅ㟈࡛࠶ࡿ㎶ࡢᙉ㟈ືࢆᴫࡡⰋዲ࡟෌⌧࡛ࡁࡿࡇ࡜ࢆ☜ㄆࡋࡓ㸬᳨- 69 -

㔝ὠ ཌ࣭㛗ᆏ 㝧௓ウᑐ㇟࡜ࡋࡓグ㘓ࡢ࠺ࡕ㸪2003 ᖺᐑᇛ┴໭㒊ࡢᆅ㟈࡜ࡿࡀ㸪୍ࡘࡢ᪉ἲ࡜ࡋ࡚㸪≉ᛶ໬㟈※ࣔࢹࣝ࡟ࡼࡾࡇࢀࡲ

2011 ᖺᐑᇛ┴ᮾ᪉Ἀࡢᆅ㟈࡟ࡼࡿ㟈※㏆ഐࡢグ㘓࡟ࡣ࡛タᐃࡉࢀ࡚ࡁࡓタィᆅ㟈ື࡜ྠ⛬ᗘࡢᆅ㟈ືࡀᚓࡽࢀ

」ᩘࡢ᫂░࡞ࣃࣝࢫࡀྵࡲࢀ࡚࠸ࡓࡀ㸪␲ఝⅬ㟈※ࣔࢹࡿࡼ࠺࡟ࢧࣈ࢖࣋ࣥࢺࡢ఩⨨ࢆỴᐃࡍࡿ᪉ἲࡶ⪃࠼ࡽࢀࣝ࡟ྵࡲࢀࡿ」ᩘࡢࢧࣈ࢖࣋ࣥࢺࡢ◚ቯ࡟ࡼࡾࡑࢀࡽࢆ

ࡿ㸬࠺ࡲࡃㄝ᫂ࡍࡿࡇ࡜ࡀ࡛ࡁࡓ㸬୍᪉㸪1993 ᖺ㔲㊰Ἀᆅ㟈ࡢ㔲㊰㸦2019ᖺ1᭶31᪥ཷ௜㸧ࡢグ㘓࡟ࡘ࠸࡚ࡣ㸪ᆅ┙ࡢ㠀⥺ᙧᛶ࡟༑ศ࡟ὀ

ពࢆᡶࡗࡓゎᯒࢆ⾜࠺ࡇ࡜࡜ࡋ㸪ከ㔜㠀⥺ᙧຠᯝ࡜ほㅰ㎡

Ⅼ┤ୗࡢᙉ࠸㠀⥺ᙧᣲືࡢ཮᪉ࢆ⪃៖ࡍࡿᡭἲࢆ㐺⏝ࡋࡓ࡜ࡇࢁ㸪㔲㊰࡛ほᮏ◊✲࡛ࡣᅜ❧◊✲㛤Ⓨἲே 㜵⅏⛉Ꮫᢏ⾡◊✲ᡤࡢࡉࢀࡓᙉ࠸ᆅ㟈ືࢆᴫࡡ෌⌧ࡍK-NET㸪KiK-net ࡢᙉ㟈グ㘓㸪F-net ࡢ MT ゎ㸪Ẽ㇟ᗇࡢࡿࡇ࡜ࡀ࡛ࡁࡓ㸬ࡇࡢࡼ࠺࡟㸪㟈※࡛ࡢ◚ቯࡢᙳ㡪ࡀ┤㟈※ࢹ࣮ࢱࢆ౑⏝ࡋ࡚࠸ࡲࡍ㸬ࡇࡇ࡟グࡋ࡚ㅰពࢆ⾲ࡋ᥋ⓗ࡟⾲ࢀࡓグ㘓࠿ࡽᆅ┙ࡢᛂ⟅ࡢᙳ㡪ࢆᙉࡃཷࡅࡓグࡲࡍ㸬㘓ࡲ࡛㸪ከ✀ከᵝ࡞グ㘓ࢆ㸪␲ఝⅬ㟈※ࣔࢹࣝ࡜࠸࠺୍
ࡘࡢᯟ⤌ࡳࡢୗ࡛ㄝ࡛᫂ࡁࡿࡇ࡜ࡀࢃ࠿ࡗࡓ㸬ཧ⪃ᩥ⊩ ಶࠎࡢᆅ㟈ࡢ෌⌧࡟⏝࠸ࡓ㟈※ࣃ࣓ࣛࢱ࡜ᆅ㟈ࡢつᶍୖ⏣ⱱ࣭✄ᐩ㝯ᫀ࣭ୖ㒊㐩⏕࣭஭ྜ㐍࣭㢼㛫ᇶᶞ࣭ᯇỌᗣ࡜ࡢ㛵ಀࢆ᳨ウࡋࡓ࡜ࡇࢁ㸪ࢫࣛࣈෆᆅ㟈ࢆᑐ㇟࡜ࡋࡓ᪤

⏨࣭⸨ᮏ೺ᖾ࣭⳥ụ႐᫛࣭ᐑ஭┿୍㑻࣭㛵ཱྀಙ୍㑻࣭ ࡢ◊✲࡜ᩚྜⓗ࡞⤖ᯝࡀᚓࡽࢀࡓ㸬⸨ᮏ⩏๎㸦1993㸧㸸1993ᖺ㔲㊰Ἀᆅ㟈࿌㸪‴᪋タ⿕ᐖሗ

‴ᢏ⾡◊✲ᡤ㈨ᩱ㸪No.766㸬ຍ⸨◊୍࣭ஂ⏣჆❶࣭┾㘠ಇᖹ࣭㔝ὠཌ࣭㔝⏿᭷⚽࣭᳃ᕝ࠾ࢃࡾ࡟῟࣭኱㔝᫴࣭ᒣᮏඃ㸦2016㸧㸸2004ᖺ⣖ఀ༙ᓥ༡ᮾἈ
ᆅ㟈㸦MJMA7.1㸧ࡢᙉ㟈Ἴᙧ࡟ᇶ࡙ࡃ⤫ィⓗࢢ࣮ࣜࣥ㛵ᩘἲࡢ࣋ࣥࢳ࣐࣮ࢡࢸࢫࢺ㸪᪥ᮏᆅ㟈ᕤᏛ఍ㄽᩥ㞟㸪 ␲ఝⅬ㟈※ࣔࢹࣝࡣᚑ᮶ࡢ㟈※ࣔࢹࣝ࡟ẚ࡭኱ᖜ࡟༢
⣧໬ࡉࢀỴᐃࡍ࡭ࡁࣃ࣓ࣛࢱᩘࡀᑡ࡞࠸࡜࠸࠺≉ᚩࢆ᭷

Vol.16㸪No.3㸪pp.234-244.

ࡋ࡚࠾ࡾ㸪ࡇࢀ࡟ࡼࡾᚑ᮶ࡢ㟈※ࣔࢹࣝ࡜ྠ➼ࡢ⢭ᗘ࡛ᙉ㔩Ụඞᏹ࣭ධ಴Ꮥḟ㑻㸦1997㸧㸸1995ᖺරᗜ┴༡㒊ᆅ㟈ࡢ㟈ືࡀィ⟬࡛ࡁࡿࡢ࡛࠶ࢀࡤ㸪ᐇົ࡟࠾࠸࡚ࡓ࠸࡬ࢇ᭷⏝᩿ᒙࣔࢹࣝ࡜㟈※㏆ഐ࡟࠾ࡅࡿᙉ㟈ືࢩ࣑࣮ࣗࣞࢩ

࡞ࣔࢹࣝ࡟࡞ࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡇࢀࡲ࡛㸪␲ఝⅬ㟈※ࣔࢹࣙࣥ㸪᪥ᮏᘓ⠏Ꮫ఍ᵓ㐀⣔ㄽᩥ㞟㸪No.500㸪pp.29-36㸬ࣝࡣ㸪ࣉ࣮ࣞࢺቃ⏺ᆅ㟈࡛࠶ࡿᮾ໭ᆅ᪉ኴᖹὒἈᆅ㟈➼࡬Ẽ㇟ᗇ㸦2011㸧㸸ᖹᡂ23ᖺ4᭶ ᆅ㟈ⅆᒣ᭶ሗ㸦㜵⅏⦅㸧㸬ࡢ㐺⏝ᛶࡀㄪ࡭ࡽࢀ࡚ࡁ࡚࠸ࡿࡀ㸪ᮏ◊✲࡟ࡼࡾ㸪ࢫࣛࣈ➲㇂ດ࣭᳃ᕝಙஅ࣭๓⏣ᐉᾈ㸦2006㸧㸸ࢫࣛࣈෆᆅ㟈ࡢ㟈ෆᆅ㟈࡟ᑐࡋ࡚ࡶᗈ⠊࡞㐺⏝ᛶࢆ᭷ࡍࡿࡇ࡜ࡀ☜ㄆ࡛ࡁ※≉ᛶ㸪໭ᾏ㐨኱Ꮫᆅ⌫≀⌮Ꮫ◊✲ሗ࿌㸪Vol.68㸪ࡓ㸬ᮏᩥ୰࡟ࡶ㏙࡭ࡓࡼ࠺࡟ࢫࣛࣈෆᆅ㟈ࡣ␲ఝⅬ㟈※ࣔ

pp.123-134㸬㰺⸨ᗣ༤㸦2009㸧㸸㥴Ἑ‴ࢆ㟈※࡜ࡍࡿᆅ㟈࡟ࡼࡿᮾྡ㧗ࢹࣝࢆẚ㍑ⓗ㐺⏝ࡋࡸࡍ࠸ᆅ㟈࡛࠶ࡿ࡜⪃࠼ࡽࢀ㸪␲ఝⅬ㟈※ࣔࢹࣝࡢ㐺⏝ᑐ㇟࡜ࡋ࡚≉࡟᭷ᮃ࡛࠶ࡿ࡜⪃࠼ࡽࢀ㏿㐨㊰⿕⅏ಶᡤࡢᛂᛴ᚟ᪧ㸪ᅵᮌᏛ఍ㄅ㸪Vol.94㸪No.11㸪ࡿ㸬

pp.10-11㸬 ࡓࡔࡋ㸪2003ᖺ5᭶26᪥ᐑᇛ┴໭㒊ࡢᆅ㟈ࡸ2011ᖺ4᭶7బ⸨ᬛ⨾࣭ᕴ㄃ᶞ㸦2002㸧㸸඲ᅜࡢᙉ㟈グ㘓࡟ᇶ࡙ࡃෆ㝣᪥ᐑᇛ┴ᮾ᪉Ἀࡢᆅ㟈࡞࡝࡛㸪㟈※㏆ഐࡢ」ᩘᆅⅬࢆᑐ㇟ᆅ㟈࡜ᾏ⁁ᛶᆅ㟈ࡢ㟈※࣭ఏ᧛࣭ࢧ࢖ࢺ≉ᛶ㸪᪥ᮏᘓ࡜ࡋࡓሙྜ࡟㸪ࡍ࡭࡚ࡢᆅⅬ࡛ࡢᆅ㟈ືࢆ㐣୙㊊↓ࡃ෌⌧⠏Ꮫ఍ᵓ㐀⣔ㄽᩥ㞟㸪No.556, pp.15-24㸬

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港湾空港技術研究所報告第 58 巻第 1 号

２０１９．８

編集兼発行人

国立研究開発法人海上・港湾・航空技術研究所

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㹇㹑㹑㹌㸯㸱㸲㸴㸫㸵㸶㸱㸰

CONTENTSᅜ❧◊✲㛤Ⓨἲேᾏୖ࣭

‴࣭⯟✵ᢏ⾡◊✲ᡤ

1. Development of Analysis Method of Moored Ship Motion in 3D Fluid Field································································· Yasuhiro AIDA, Katsuya HIRAYAMA ·············· 3

2. Strong Motion Simulation with the Pseudo Point-source Model for Intraslab Earthquakes··································································· Atsushi NOZU, Yosuke NAGASAKA  ··········· 41ࢽსߗࢽܿ੅ࡄ‫ݪ‬ਫ਼!
༭࣬!
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
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΃Ͷ΁΀΃΅͑΀ͷ͑΅͹Ͷ͑΁΀΃΅͑ͲͿ͵͑Ͳͺ΃΁΀΃΅͑΃Ͷ΄ͶͲ΃ʹ͹͑ͺͿ΄΅ͺ΅Ά΅Ͷ͑
͑
͑
͑
͑
͑

·΀ͽͦͩ͑͟ ͑ ͑ ͿΠ͑͟͢ ͑ ͲΦΘΦΤΥ͑ ͑ ͑ ͑ ͣͪ͑͑͑͑͑͢͡ͿͲ͸Ͳ΄Ͷ͝Ί΀ͼ΀΄ΆͼͲ͝ͻͲ΁ͲͿ͑͑ͿͲ΅ͺ΀ͿͲͽ͑ͺͿ΄΅ͺ΅Ά΅Ͷ͑΀ͷ͑;Ͳ΃ͺ΅ͺ;Ͷ͑͝΁΀΃΅͑ͲͿ͵͑Ͳ·ͺͲ΅ͺ΀Ϳ͑΅Ͷʹ͹Ϳ΀ͽ΀͸Ί͑