講演要旨集（GSJ 研究資料集 no. 610 PDF / 3.2 MB）

AIST14 -K00006
地質調査総合センター研究資料集，no. 610
Open-File Report of Geological Survey of Japan, no. 610
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ȿ ˴
Acocella, V., Yoshida, T., Yamada, R. & Funiciello, F. (2008)
Structural control on late Miocene to Quaternary
volcanism in the NE Honshu arc, Japan. Tectonics,
27:TC5008 doi:10.1029/2008TC002296.
Aizawa, K., Acocella, V. & Yoshida, T. (2006) How the
development of magma chambers affects collapse
calderas: insights from an overview. In: Troise, C., De
Natale, G. & Kilburn, C.R.J. (eds) Mechanisms of
Activity and Unrest at Large Calderas. Geological
Society, London, Special Publications, 269, 65-81.
Awata, Y. & Kakimi, T. (1985) Quaternary tectonics and
damaging earthquakes in northeast Honshu, Japan.
Eartuq. Pred. Res., 3, 231-251.
Ê ЧЦŹŮ¢ǽ̝̂ƿϋъƵƖЦѕ1992і
аёјȃˡƳĄїОžˬƷїȃƳїɓЫOA
аёˡƳ= K-Ar ǏÀјɭěɉɨǤ̽Ŕ͍ˡƳ=
ǉ˱ЀĄ=ȏ̸ɓɤјљ岩鉱ї87ї39-49.
Honda, S. & Yoshida, T. (2005) Application of the model of
small-scale convection under the island arc to the NE
Honshu subduction zone. Geochem. Geophys.
Geosystem, 6, Q01002, doi:10.1029/ 2004GC000785.
Æΐπ˽ʒ̀ ƕžƳÞѕ1989іɭěɉɨͺɼ
Šũ;ĂǇ+R¦Ʌ£ǱɤѰьɅ£=ùͯ
;46љ地質学論集ї32ї409-429.
ѐЅŉǫēΐ̢ɴʮǐżĻ̀ĵϾѕ1991іɉ
ɨ=Ʌ˽̃ƱǕ8Šĵљ114pї地質調査所報告ї
̽ 274 ķ.
Kimura, G. (1986) Oblique subduction and collision:
Forearc tectonics of the Kuril arc. Geology, 14,
404-407.
Kimura, J-I. & Yoshida, T. (2006) Contributions of slab
fluid, wedge mantle, and crust to the origin of
Quaternary lavas in the NE Japan arc. J. Petrol., 47,
2185-2232.
Kondo, H., Kaneko, K. & Tanaka, K. (1998)
Characterization of spetial and temporal distribution
of volcanoes since 14 Ma in the Northeast Japan arc.
Bull. Volcanol. Soc. Japan, 43, 173-180.
Kondo, H., Tanaka, K., Mizouchi, Y & Ninomiya, A. (2004)
Long-term changes in distribution and chemistry of
middle Miocene to Quaternary volcanism in the
Chokai-Kurikoma area across the Northeast Japan
Arc. Island Arc, 13, 18-46.
Ƙš̓łßɴǜˌϠ ơɮ´ Ȉѕ1986і̥
ƶ͙ȏP΢0¦Žě˄ϳ=ǱɤɅ˽ÀƳŠǪȏ
ĵљ地団研専報ї31ї385-294.
ƎƯÁɘЦѕ1983іɉɨ=ˡƳŠǪљɭŹāˮÉїpp135.
¦ƿóǣЮэ ʹĻ̀ʕͰѕ1986іаёјȃˡƳ
ĄѥɭěɉɨǤˡƳvљ岩鉱ї81ї471-478.
Nakajima, J. & Hasegawa, A. (2003) Tomographic
-4-
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
imaging of seismic velocity structure in and around
the Onikobe volcanic area, northeastern Japan:
implications for fluid distribution. Jour. Volc.
Geotherm. Res., 127, 1-18.
£ƺ æʍĦ ǷЊΝˇчђ2000ѓƳȐ̑ˍ˽̊
ŝ:ṵ̃̊̅ϱĲѕɂ˺½Ǯɡ8 OŻͮưͶ
£ϗϼ:ŝϊʃϪ̅ϱĲ8Аϫ&3і地質学雑誌є
106є93-111.
Nakajima, T., Danhara, T., Iwano, H. & Chinzei, K. (2006)
Uplift of the Ou Backbone Range in Northeast Japan
at around 10 Ma and its implication for the tectonic
evoltion of the eastern margin of Asia.
Palaeogeography, Palaeoclimatology, Palaeoecology,
241, 28-48.
Pollitz, F.R. (1986) Pliocene change in Pacific plate motion.
Nature, 320, 738-741.
Î΍ʜŀǺђ1992ѓɪĘɆɥ£ϼŝŦ:Ǯɡɂ˺½q
`sv`hі地質調査所月報є43є119-139.
Sato, H. (1994) The relationship between late Cenozoic
tectonic events and stress field and basin development
in northeast Japan. Jour. Geophy. Res., 99, B11,
22261-22274.
Î΍ʜŀǺĸ˽ʒͭƳƸυŇÎ΍ɐǍʦ˽ƌ
МˁЂǵ¶ђ2004ѓǮɡɂ˺½8 OɪĘɆ
ɥ£ϼʹǡŦ:ŝʙʃϪ̅ϱѕɛϠ:ŝʙʃϪȥ
ɲS£Ǹ5&3ѕі石油技術協会誌є69є145-154.
Tamura, Y., Tatsumi, Y., Zhao, D., Kido, Y. & Shukuno, H.
(2002) Hot fingers in the mantle wedge: New insights
into magma genesis in subduction zones. EPSL., 197,
105-116.
ȎνȌơÇ ФУђ2001ѓɪĘɆɥǡєЭю˞ư:
ǧȌĲ5¥ȌÿėƉ͖Ȍі岩石鉱物科学є30є
105-116.
ɺ˽ʿĵɭ ÝŸϻÇ ФУÎɢ ƒŶū
ĵϋ̚ņǍђ1999ѓɪĘɆɥє˞ư~s»
Ϡ: 2.0Ma ¾Д:˞ưʹē5q`sv`h:ȧ̪і
火山є44є233-249.
ˁЂǵ¶ɫ˙ɗŨÞϻ£ɦ͟Ɔưɥɋ
ЋνƼ ɏĸ˽ʒͭђ1998ѓ1996 ǌ 8 ɜ 11 Ɇ
ƕť̑шу»Ϡ8̅˺&-ŝЪ813і地震第
２輯є51є253-264.
Yamada, E. (1988) Geologic development of the Onikobe
caldera, northeast Japan, with special reference to its
hydrothermal system. Rept. Geol. Surv. Japan, 268,
61-190.
Yamada, R. & Yoshida, T. (2011) Relationships between
Kuroko volcanogenic massive sulfide (VMS) deposits,
felsic volcanism, and island arc development in the
northeast Honshu arc, Japan. Mineral Deposita,
http://dx.doi.org/10.1007/s00126-011-0362-7.
Yamaji, A. (1994) Thermal history of the NE Japan frontal
arc since the Late Miocene inferred from vitrinite
reflectance. Geopisica. Int., 33, 45-51.
ưîƈǐђ1992ѓÆʸŝŦ:Ǯɡ£ɂ ѕɚɂ ]
r˞ưͬі地質学雑誌є98є21-38.
̗ЂУ̿˽£ɋƆчʊʑɋŶ¦ÜʵϹ̻˽ȵ
ñɺ˽ʿĵ£ĵ Ɋђ1999ѓɆɥāƷŝˊĕ
ϽŖіŝϊζɲȏ.
ƌ±ðŶưîʑ͜ђ2000ѓɪĘɆɥǡє̯ǘƴŝŦ
:˞ưƮǒ5 K-Ar ǌ½ѕΈ& K2O 8¨&
a:ʹēɐɡі岩石鉱物科学є29є74-84.
Yoshida, T. (2001) The evolution of arc magmatism in the
NE Honshu arc, Japan. Tohoku Geophys. Jour., 36,
131-149.
ĸ˽ʒͭђ2009ѓɪĘɥƽǡ8 OǮɡɂ˺½:˞
ȌʹēĲі地球科学є63є269-288.
ĸ˽ʒͭ̎˙ǍʭЋʊ;МÎ΍ʜŀǺŶĮæ
Ǻɢɦ͎ŶǋƜµђ1999ѓɪĘɥƽǡєƷ
ǡ˞ưʹēɡ:ŝĲ5Ǯɡɂ˺½]rͬ:ǧ
Ȍі月刊地球єĴų 27є123-129.
ĸ˽ʒͭ£Ʒ˄ЋνƼ ɏÎ΍ʜŀǺЋʊ
;Мɢɦ͎˽£ɋƆPrima, O.D.A.ŶĮ
æǺђ2005ѓǮɡɂ˺½єɪĘɥƽǡ8 O˞
ȌʹēĲ5ŝʙsʃϪі第四紀研究є44є
195-216.
ĸ˽ʒͭŶĮæǺГϼɕǨђ1995ѓɂ˺½ɪĘɥ
ƽǡ:ŝʙsʃϪ5aόˎˬϊ:Ų
ϴі地質学論集є44є263-308.
Yoshida, T., Kimura, J-I., Yamada, R., Acocella, V., Sato, H.,
Zhao, D., Nakajima, J., Hasegawa, A., Okada, T.,
Honda, S., Ishikawa, M., Prima, O.D.R., Kudo, T.,
Shibazaki, B., Tanaka, A. & Imaizumi, T. (2014)
Evolution of late Cenozoic magmatism and the
crust-mantle structure in the NE Japan Arc. In:
Gomez-Tuena, A., Straub, S.M. & Zellmer, G.F. (eds)
Orogenic Andesites and Crustal Growth. Geological
Society, London, Special Publication, 385,
http://dx.doi.org/10.1144/SP385.15.
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1968ѓ
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ȣЗ(O4ЁΞ7ŧ̡ȃŪ5Ëͪ» -і
水の付加による
ソリダス降下
加熱
上昇
温度
図 1 マグマの発生に対する，マントルの上昇，加熱，
水の付加の概念図．星印の温度・圧力条件にあるマントル
が加熱（右に移動），または上昇(下に移動)すると，マントル
はソリダス温度（溶融温度）を越えるため，マグマが発生す
る．あるいは，マントルの温度・圧力がおなじであっても，水
の付加によってマントルのソリダスが低下(左に移動)した場
合には，マグマが発生する．
-6-
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
δT=(1—XAW)(δMW—15) + XAW(δMW+15)
H2O saturation and degassing of magma
PH2O
water
solubility
XAW =
magma
1
30
MW
+
15 +
30
T
Ǟњ
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undersaturated
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saturated
5єaʟ:hzhђǞљѓ5Mєa
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ʟ͐ĹËÏʜS˼-a:óƳĽʟЃȧƐʱ4
degas s ing
foam
Oі
or
mis t
bubble
melt
図2マグマの減圧に伴うマグマ水の析出と散逸，星印の含
水量・圧力状態にあるマグマが上昇（下に移動）すると，飽
和含水量曲線を越えるため，マグマ中に気泡が発生する．
気泡量はマグマの上昇とともに増加するが，それらの抜け
かたは噴火様式によって大きく異なる．
+"4":ŋм:ΥʧSɡǬ&3є˞ưƳ8ĽEP
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15
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^hĖɝˬ:ĽʟЃS̍Ȧÿɬ(O"58L03Ǳ
δT=XAW×δAW + XDW×δDW + XMW×δMW
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MPOєaʟ8сņ&-ɨÁ4;єs:
сņ˒ΥǕ5ŚĎ5MʣHO"5Iİ͵4OіǞ
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ȿ ˴
Ghiorso, M. S. and Sack, R. O. (1995). Chemical mass
transfer in magmatic processes IV. A revised and
internally consistent thermodynamic model for the
interpolation and extrapolation of liquid-solid
equilibria in magmatic systems at elevated
temperatures and pressures. Contrib. Mineral. Petrol.,
119: 197–212.
Kushiro, I., Syono, Y., and Akimoto, S. (1968). Melting of a
peridotite nodule at high pressures and high water
pressures. Geophys. Res. Lett., 73 (18): 6023–6029.
Miyagi, I. and Matsubaya, O. (2003). Hydrogen isotopic
composition of hornblende and biotite phenocrysts
from Japanese island arc volcanoes: evaluation of
alteration process of the hydrogen isotopic ratios by
degassing and re-equilibration. J. Volcanol. Geotherm.
Res., 126: 157–168.
Miyagi, I. and Yurimoto, H. (1995). Water content of melt
inclusions in phenocrysts using secondary ion mass
spectrometer. Bull. Volcanol. Soc. Japan, 40: 349–355.
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風早康平・高橋正明・尾山洋一・安原正也（活断層・火山研究部門深部流体研究グループ）
長谷川昭（東北大学名誉教授）
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ɥ̛̲;єǋȌ 18 ǌǕɪĠˁĠˁŝЪˋ:-H
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-ÿɬãSĐ-I:4Oі
ȼ ˱
͞˽ņƎŶʫÝ¯ɧǜŘư˽α(2005)ŶÿǋЂ:
˃ϼ8ωƇ$POɝхţ˨ʟ:όˎі温泉科学, 55,
64-77.
Hacker, B. R. (2008) H2O subduction beyond arcs.
Geochem. Geophys. Geosyst., 9, Q03001,
doi:10.1029/2007GC001707.
ЋνƼɏ£Ʒ˄ĘÎɯƆϞí¸ɂƪȂǋ
Ʋ˽̘ǁɫ˙ɗϏŶьђ2008ѓŝЪʳ4FɪĘɆɥʨFϟFǆ:ʟ:ǳ˹є地学雑誌є117,
59-75.
Iwamori, H. (1998)Transportation of H2O and melting in
subduction zones. Earth Planet. Sci. Lett., 160, 65-80.
˪ưϺŹǋùæ£Ʒ˄ђ2010ѓɆɥāƷ4
:ʨFϟFjh:Ŵʄǿє地学雑誌є119,
205-223.
пɉǙǋчʊ ʑɋƌĦʑªΝƨŎɟ̯ɦɋǨ
ɽƼǵȷÎ΍đчʊʿĘƲρŶʫÝ¯
ƨưʶŶņ˽ϰƆŬɥȽŨĮɷфȎƸ
ΙυĀ˽ĵ (2014)ΝĠɆɥ8 Ohόˎ
˃ϼʻÏ:ÿǄ5˭Ƕ,日本水文科学会誌, 44,
3-16.
- 11 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
ø ȑßűſĿV?De{ȫƴƟWÏĵɨɠų³ɪ
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- 12 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
øɫŉĦþɘWƯĻWÏĵ(/,'%!0!.'
SƯȾºòƨþɘWÏĵɨƞȧĺÆÙɘƴVbeɩɫ
Kusuda C., Iwamori H., Nakamura H., Kazahaya
K.,Morikawa N. (2014) Arima hot spring waters as a
deep-seated brine from subducting slab, Earth Planet
Space , (in press)
Matsubaya, O., Sakai, H., Kusachi, I. Satake, H. (1973)
Hydrogen and oxygen isotopic ratios and major
element chemistry of Japanese thermal water systems,
Geochem. J. , 7, 123-151.
ΝɦϬɷϺУΝ˽˗ђ2006ѓɝхˊʰ:ŝϊʃ
Ϫє温泉科学є56, 3-15.
Nishio Y., OkamuraK., Tanimizu M., Ishikawa T. Sano, Y.
(2010) Lithium and strontium isotopic systematics of
waters around Ontake volcano, Japan: Implications
for deep-seated fluids and earthquake swarms. Earth
Planet. Sci. Lett., 297, 567-576.
Ohmi S., Hirose I., Mori J. (2004) Deep low-frequency
earthquakes near the downward extension of the
seismogenic fault of the 2000 Western Tottori
earthquake. Earth Planets Space, 56, 1185-1189.
Omuralieva A. M., Hasegawa A., Matsuzawa T.,
Nakajima J., Okada T. (2012) Lateral variation of the
cutoff depth of shallow earthquakes beneath the
Japan Islands and its implications for seismogenesis.
Tectonophys., 518, 93-105.
ŶʫÝ¯͞˽ņƎư˽αпɉǙǋ (2010) ƕƸǋ
Ђ:Ŷ˃Ǖˊʰ±Mʻþ(Oŝ˨ʻÏ:ŝėƉ
˭ǿ5όˎі温泉科学є59, 295-319.
чʊʿɑƕɦ˄ђ2009ѓɆɥāƷ8 O˃ϼÌ
łʳŝЪ:̅˺ˮʯі北海道大学地球物理学研究
報告є72є177-190.
чʊʑɋпɉǙǋƌĦʑªŬɥȽÎ΍đч
ʊʿɽƼǵȷŶņ˽ϰƆƨưʶ΀Ħɖ
Ǩ̯ɦɋǨЄɢ̨ņĝ˽ƏƆÀЏ͎Ɔ
ɫƨ´Ɔ̹ù¦ƆĀ˽ĵŶ¤͎ђ2011ѓ˃
Ʈŝʟrlhє地質調査総合センター研
究資料集, no.532, ˻ɿȓΑ͠ķ̛̲ȏŝϊζɲ
͠ķjl.
Tamura Y., Tatsumi Y., Zhao D., Kido Y., Shukuno H.
(2002) Hot fingers in the mantle wedge: new insights
into magma genesis in subduction zones. Earth
Planet. Sci. Lett. 197, 105-116.
Togo Y., Kazahaya K., Tosaki Y., Morikawa N.,Matsuzaki
H.,Takahashi M.,Sato T. (2014) Groundwater in
Joban and Hamadori areas, southern Tohoku, Japan,
possibly originated from subducted sediments. Earth
Planets Space , 66, 131.
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ƒIfŮĩŎÕiąƵŎÕSGQșěGQLǽƄɫb
OǹΞOђŖ2; ŶšƕƼ, 2014ѓі̺8єϯħ
dĠȉWɝĄAąƵŎÕVȳ=ŎÕɨȯƪıŮĩAǗ
:®πM:ųȡɨÁ:ŲėSΞœA(Oі(7R/Ɂ
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Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
ђ{lѓ:Ųė4OіċͰ;єƠπ5(OɁ
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Ʈʹē&J(ǻĎ8Ųė(Oİ͵ǿђΞœA1ѓє
:̳ЏŲėίHMPOђÔ<єGudmundsson et al.,
L>ɁƮłŕ:ŝϊʃϪL>ŝϊʃȌƳÏ:Ћɡ
2010ѓіƳÏǤǕ:̳ЏŲėє6:̬Ǖ6:́ŕ
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- 17 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
ĦƆĎƌóÜƌЖѓ
ǋȌ 24 ǌǕŝƮýÿ8ÙOŝ
ϊά×Ȑʱ̽:ȹéL>Ɉ˯̵ΐȵʱµĦƆĎƌ
óŧ̋ʌʃǋȌ 25 ǌǕ ŝϊʞâАϫ®π:Ƥɩ
ˋ8 O̠ƒǿ:ɾΧ5&3ƒɄ&-Ȍɮ4
Oі
ȼ ˱
Di Toro, G., Han R., Hirose, T., De Paola, N., Nielsen, S.,
Mizoguchi, K., Ferri, F., Cocco, M., Shimamoto, T.
ђ 2011 ѓ Fault lubrication during earthquakes.
Nature, 471, 494-498.
Gudmundsson, A, Simmenes, T.H, Larsen, B., Philipp, S.L.
ђ2010ѓEffects of internal structure and local stresses
on fracture propagation, deflection, and arrest in fault
zones. J. Struct. Geol., 32, 1643-1655.
ʹɁƮ̛̲Æͣђ1991ѓ ɂͣɆɥ:ʹɁƮѢÿǄŖ5
χȿ. ɪ´ŶƉþ˫Æ, 437p.
Katsumata, K., Kosuga, M., Katao, H., The Japanese
University Group of Joint Seismic Observations at
NKTZђ2010ѓ Focal mechanisms and stress field in
the Atotsugawa fault area, central Honshu, Japan.
Earth, Planets and Space, 62, 367–380.
Morris, A., Ferrill, D.A., Henderson, D.B. ђ 1996 ѓ
Slip-tendency analysis and fault reactivation. Geology,
24, 275-278.
£˽ ч·ʰÛȼͣђ2002ѓʹɁƮή͓rgl
oіɪ´ŶƉþ˫Æ, 60p.
Ŷʊͱņђ2014ѓЋɡ̉7ˬϊ͖ͨŲė8LOɁƮ
ǤǕŲϴі日本地質学会第 121 年学術大会講演要
旨єR13-O-12.
Orife, T., Lisle, R.J.ђ2003ѓNumerical processing of
paleostress results. J. Struct. Geol. vol. 25, p. 949–957.
Ŷš αƕƼʓŵŬɥ Ƚưîƈǐˉϼ΂Ź
ђģĈ£ѓŝƮýÿ:ЋɡƌóSά×(OС:Ɂ
Ʈʹē8 O̠ƒǿі地質学雑誌і
Ŷš αƕƼʓŵђ2014ѓɁƮʹē8 OŝϊƉ
̉ɐЏhb4ͯȋ(OB̫кǕ®π5Ƥɩ
ˋ4:̠ƒǿі日本地質学会第 121 年学術大
会講演要旨єR24-O-2і
Otsubo, M., Miyakawa, A., Kubo, A.ђ2013ѓSpatial stress
heterogeneity imaging by using difference between
reduced stress tensors detected from earthquake focal
mechanisms. Proc. the 6th International Symposium
on In-situ Rock Stress (RS2013), 1123-1128.
Ŷš αƕƼʓŵ¦Ü̓Πђ2013ѓŝʙǻĎ:̳
Џ̉şǿSȔȫ(OέFѢŝЪ:]vi
ΥMȧƐ$POǻĎqk:ЯоÉǕ8ŧ2
ŝʙǻĎo}aі日本地球惑星科学連合
2013 年大会予稿集єSCG68-P02і
˻ɿȓΑ͠ķ̛̲ȏ˃ϼŝϊ˹Ư̲̊dUͣђ2012ѓ
ʁΞζɲ:ζɲά×е̌8А(OȓΑχȿѕ̵
ŝΞÁA:ϳķǿ5+:ɴȚ57Oζɲ͘ɮ:ſ
Ǧǿѕ. 地質調査総合センター研究資料集, 556,
112p.
Twiss, R., Moores, E.ђ1992ѓStructural Geology. W. H.
Freeman, NewYork, 532p.
ɺ˽ʿĵνƼɒєƌʥæђ2013ѓŝʙŲē:
ʄ͜͝ǿ5Ƥɩˋ―ŝƮýÿ:ƌóά×:Ρˢ
M―і地学雑誌є122, 385-397.
- 18 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
- 19 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
ȬĴĒþɘSűſÑįWȵīȸØ
池田安隆（東京大学理学系研究科地球惑星科学専攻）
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ͽ8Ч&і+"4ЁΞ87O:;єŋм5(O
įŝЪˁƵϼ:МόʨДSÇ0-ļ5
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ó8ȑ/˂(L7ŲēŝЪɐђL>ŝЪǮ
:ÑĒŲē5&3ѓό"O"5ƍóʔΥȴW
s:˭Ƕ4OMђIkeda, 2012; ʦ˽Cє
2012; ŖћѓєˁƵђ58ǴƦ7ˁʟˏŲė8ȷ
Ȉ8Īǻ&3Ųė(OǊ˖˹Ůѓ8 Oįˁʟ
ˏǲî":L7WsSăƐ(OʧHȐ
57OђAtwater, 1987; Atwater et al., 1992,
2004; Cisternas et al., 2005; Shennan and
Hamilton, 2006; Sawai et al., 2004ѓі
Transect A
75
40°
75
50
50
25
25
Bouguer
anomary,
mgal
0
Pliocene~Quaternary shortening
0
Depth, kml
0
Transect A
15
39°
14.3 km
5
10
Present
Breakaway
Japan Sea
5 Ma
Tr
an
se
ct
C
Breakaway
Transect B
39-43 km
30 Ma
38°
75
Transect C
50
Transect D
50
25
0
5
10
8.2 km
Present
Legend for
geologic units:
Age
5 Ma
100 km
139°
140°
Transect
A
C
Quaternary
Pliocene
Breakaway
Miocene extension
138°
Bouguer
anomary,
mgal
Pliocene~Quaternary
shortening
0
Breakaway
c
ni
a
lc
Vo
75
0
Depth, kml
fro
nt
25
37°
Miocene extension
56 km
30 Ma
Miocene
Pre-Mio.
10 km
øɬɫƂÚűſĿV?DeŁďłɝĄɨȅȭ7pxtćǫǔɯńWɝĄɩSKfiƒÐe´ȏǓ
UþȩŮɚɨéøɩɫOkada & Ikeda (2012) iŤďɫŮɚ A S C iø 2 VǢHɫêŮɚøX¡@cɪ
vɂÕǑķɪǅýWþȩƐȵɪ§ů¤žWþȩƐȵɨɦů¤∼ǅý]RVȫENLǜȂďłiľBř
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Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
ћіˋŝƉ̉ʔϩǕ5ŝϊƉ̉ʔϩǕ:̖̏
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O5ͯMPOі
øɭɫ
ɳĳøɴƂÚűſĿV?DeŻȳWāǖďØSčǏþɘWɘƴĄɨƢǌ[@ɪ2012; Ikeda,
2014ɩɫəȉWǳÃȁXɪ1955-1981 ĹWŽɋV?DeɤƸȕƲ@cơ_LɓȫȴĻɨà¹ɮmm/yrɩ
ɨKato,
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GLɝĄX 2011 ĹƂÚþŰĔĸƩƤþɘWɘƴĄɫ
ɳéøɴĔĸƩĮV?Deȹã 55 ĹɋW¡¢ďØɨú
ûþǇɏɪ2010 VbeɩɫêɤƸŚW¹ȃXĳøäƽɫȪǚáXêɤƸŚWȳCRȫENL Mw 7.0 µ¡
WčǏþɘɨ1993 ĹƇĝƤþɘS 1994 ĹɅȰƤþɘiɐCɩɫ
- 22 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
ќіɪĘɆɥʨFϟFǆ:ŗ̔Υȴϯ̬
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FϟFǆ:ŗ̔иŦ;̃ǈ8˃ђ˃Ǖ ~100 km
E4ѣŖ 3Bѓє"P;ǮϢ:L8º:ʨFϟF
ǆ4;FMP7˭Ƕ4Oі2011 ǌ:ŝЪɐ
8;є":ǉǐŗ̔иŦ:ʽϼђ˃$~50 km
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ǌ[@ɫ2012ɩɫ
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Vǖ®HeŮɚɫƣ^Ȳ^ĶWłǂXƂÚűſi
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kþɘɨMw 9.0ɩɪ?bY 1964 Ĺk{qɨMw
9.2ɩþɘAEW}mVĨHeɫEW}mW
þɘǒǉĉRXɪþɘɋWùǙɝĄSþɘŷWǠ
ȼ ˱ ʦ˽ƌМƲ˽̒¸˽Ďʑżђ2012ѓɪĘɆɥ
Ʒǡ—ˁˑ͉8 OЋɡ̉ʔFΊ̰ϯ̬5
ύƿŶʔFΥȴWsі地質学雑誌є118,
ĎɝĄɨ¢øWȪĔĜȁɩSAȈHeWRɪþ
294-312.
Ikeda, Y. (2014) Strain buildup in the
Northeast Japan orogen with implications
for gigantic subduction earthquakes.
Episodes (in press).
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ÚþɘɨMw 9.0ɩW¿G@ǛcfQ=U=ɫþ
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- 23 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
Ů
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- 24 -
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Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
Ů
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- 25 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
ǲôǶƻī}{Wƫǋ¬¿
6ȑßűſVÏĵHeƻīWŷǭÏĵ6
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- 26 -
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
Southwest Japan intra–plate monogenic volcanism:
Case study of San–in Pliocene–Quaternary volcanic centers
Hoang Nguyen, Jun'ichi Itoh, Isoji Miyagi, Kuniaki Nishiki
(Institute of Earthquake and Volcano Geology, AIST)
Monogenic volcanism occurs in the San–in area in 4
major stages associated with the Japan Sea opening and
the subduction re–initiation of the West Philippine Sea
plate (Uto et al., 1994; Kimura et al., 2003; after Tamaki
et al., 1992; Taira, 2001). The eruptive stages include
pre–opening (>20 Ma), syn–opening (20–12 Ma?), post–
opening (12–4 Ma?) and arc–related (4–0 Ma).
Samples with ages ranging from ca. 5.3 to 1 Ma were
collected in Tottori Nanbu, Kurayoshi, Sakane, Wakasa,
Mihirayama and several other localities to analyze for
geochemical and Sr–Nd–Pb isotopic data. The samples
are phyric basalt, basaltic andesite, andesite, dacite and
rhyolite. Except for a few basaltic samples falling in the
alkaline field, most of samples follow the normal
tholeiitic trend (Cox et al., 1979). Some samples from the
Tottori Nanbu and Kurayoshi areas having high MgO
and SiO2, high Sr/Y (45–110) plot in the adakite field,
although different from field defined by Setouchi high–
Mg andesite (Shimoda et al., 1998). The study samples
exhibit high LILE/HFSE ratios (for example, Ba/Nb),
high (relative) Pb and Sr contents, the features vastly
attributed to the involvement of arc–related (crust–)
hydrous fluids in the mantle source. Their 87Sr/86Sr
ratios are high (0.7045–0.707) and εNd are relatively low,
between 2 and 3, accompanied by relatively high ratios
of 206Pb/204Pb (18.2–18.4) and 208Pb/204Pb (38.34–38.65),
suggesting involvement of crustally enriched source in
the magma formation. Correlation between the isotopic
and trace elemental compositions reveals a combined
effect of fractional crystallization (FC) and assimilation–
fractional crystallization (AFC) in the formation and
evolution of San–in volcanics.
The Northern Kyushu (SW Japan) intraplate
monogenic volcanics including south Hirado 15 Ma
tholeiites, Ikitsuki–Hirado 7–9 Ma, Iki–jima 8–1.3 Ma
and Gotoshima 1–0.1 Ma alkaline basalts (Hoang and
Uto, 2003; Hoang et al., 2013; Uto and Tatsumi, 1996;
Uto et al., 2004) located west of San–in, are taken for
regional comparison. In difference from the San–in
magmas the northern Kyushu are mostly basalts.
Except for older basalts from south Hirado and Ikitsuki–
Hirado which show geochemical and isotopic
characteristics comparable to the San–in lavas, the
younger northern Kyushu basalts, including most of the
Iki–jima samples, are distinct from the San–in in that
they have lower SiO2 and higher FeO* and TiO2, their
trace element patterns, showing high LILE (Ba, Rb,
Sr…), high HFSE (such as Nb, Ta, Zr, Hf…) and high
rare earths, are oceanic island basalt (OIB)–like; their Sr,
Nd and (especially) Pb isotopic compositions are
characteristically more depleted. These geochemical and
isotopic features observed in the young northern
Kyushu basalts are consistent with being derived from a
deep, asthenospheric source as compared with the San–
in lavas.
The difference between San–in and young (<7 Ma?)
northern Kyushu monogenic intraplate magmas thus
reflects the difference in depths of magma generation.
The San–in basalts, showing high SiO2, low FeO* and
TiO2, high LILE/HFSE ratios and variable enrichment
of Sr, Nd and Pb isotopes may reflect melts being
generated in a shallow, crustally contaminated mantle,
introduced, for example, by Cretaceous Pacific
subduction (e.g., Uto et al., 1994). This mechanism has
also been explained for the formation of 15Ma south
Hirado and 7–9 Ma Ikitsuki – Hirado melts. In contrast,
the younger northern Kyushu basalts, exhibiting OIB–
like geochemistry, low 206Pb/204Pb (17.7–18.2), relatively
low 87Sr/86Sr (0.7035–0.7045) termed as Indian Ocean
asthenosphere–like isotopic signature is believed to
present throughout the eastern Asian mantle, may
reflect being derived from deeper, more fertile and
enriched asthenospheric sources (Hoang and Uto, 2003;
Hoang et al., 2013; Uto et al., 2004). This research project
has been conducted as the regulatory supporting
research funded by the Secretariat of Nuclear
Regulation Authority (Secretariat of NRA), Japan.
References
Hoang & Uto (2003) Chem. Geol.; Hoang et al. (2013) J.
Geodyna.; Kimura et al. (2003) Island Arc.; Shimoda et
al. (1998) Earth. Planet. Sci. Lett.; Tamaki et al. (1992)
Proc. ODP; Taira (2001) Ann. Rev. Earth. Planet. Sci.;
Uto et al. (2004) Tectonophys.; Uto et al. (1994) Geochem.
J.; Uto & Tatsumi (1996) Island Arc.
- 27 -
č Űű INĿķ»Ě<ƼǗƽǙƹǗǋƺƳǎ
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- 28 -
ȿ ˴
˭ƳϽżF (2010) ɉɨĄƺ 7=ʫIϢIm
k=ŷʇȂљ地学雑誌ї119(2)ї205-223љ
тɌǜǎF (2014) Πģɉɨ;#RkϏˑʾ
Ò=ĂǇ8˰ǹљ日本水文科学会誌ї44(1)ї3-16.
Horiguchi, K. et al. (2010) Geographical distribution of
helium isotope ratios in northeastern Japan. Island
Arc, 19, 60-70.
Sano, Y. and Wakita, H. (1985) Geographical
distribution of 3He/4He ratios in Japan: Implications
for arc tectonics and incipient magmatism. J.
Geophys. Res., 90, 8729-8741.
Sano, Y. and Nakajima, J. (2008) Geographical
distribution of 3He/4He ratios and seismic
tomography in Japan. Geochem. J., 42, 51-60.
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- 29 -
ȿ ˴
ʀƿǸȺȑƻΜψѕ2013івǋ;ĲŠ ʢǏÀ
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͓ļÎÒȷƦǎΖæuoШљ地質調査総合セ
ンター研究資料集їno. 582їŠύιɵͣĺm
oї21p.
Ď ųŴ INŁĸ¼ě<ƿǚǀǜƼǚǎƽƶǑ
ŎÕ@cêŮĩƫØőWŷɋďÙ
ĞıƙđɨþȩŒĈǞǬȾɇ þȩþƜƫØǞǬtɩ
ĒĀ ȟɨƫŮĩƻīǞǬȾɇ ɆŽþȩďØǞǬtɩ
:ǻĎū4;єˍxƴɁƮL>±ȎʫɁƮ;)
PIч slip tendency :ãṢ&єʹēǿч0
-5ȧƐ$POі
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ɛϠ:ŝϊɐ½8ͩNϡ&ʹē&єƤɩIʹē(O
"5ȧƐ$POɁƮђʹɁƮ̛̲Æ ͣє1991ѓ5
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)&IĹ'ϭēђʹēѓS͝ O5;ЕM)єW
zgq`sv`hђÔ<єÎ΍, 1996ѓ:L
8є̃7OˮʯђǻĎūѓ83̃7OϭēS
ɁƮа:ǧˮ5&3єFukushima et al. (2013):r
lSÓ˼&-іE-єɥ̛̲:Υɬ;ϼĦƆĎ
ΠćƂňÆĦƆĎΠćǏǋȌ 26 ǌǕŝƮýÿ:ƌ
óƟɲ8Ļ -ά×Ȑʱ̽:ȹéƂΨφђŝϊАϫ
ȃŪ:ȹéѓ®ɿ5&3ÒȌ&-aS˼
-і
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ʹēǿSά×(O-H8;ɁƮ:ͪPOǻĎū:
ŲėIȄƐ&-ά×ǹΞ87OіE-єǻĎū:
Ųė;єЋɡ̉8˺'OŲė. 47є2011 ǌ 3
ɜ 11 Ɇ8̅˺&-ɪĘŝɃŸǋʶʩŝЪ:L7
ƿŶŝЪ:Ǯ8I˺'O"5̘MP3O
ȼ ˱
ʹɁƮ̛̲Æͣђ1991ѓɂͣ Ɇɥ:ʹɁƮ: ÿǄŖ
5χȿіɪŶþ˫Æє4 p.
Î΍ʜŀǺђ1996ѓɆɥāƷ:Wzgq`
sv`hі活断層研究є15, 128—132 .
ђHasegawa et al., 2012ѓ
і+"4єɥ̅Δ4;ɪĘŝ
ɃŸǋʶʩŝЪ̅˺Ǯ:RŝŦ4:ǻĎŲė8
I523єˍxƴɁƮL>±ȎʫɁƮ:ʹēǿ
:ɐЏŲė813̅Δ(Oі
њіRŝŦ:ǻĎŲė5ɁƮʹēǿ:ȧƐ
Hasegawa, A., Yoshida, K., Asano, Y., Okada, T.,
Iinuma, T., Ito, Y.
ђ2012ѓ
Change in stress field after
the 2011 great Tohoku-Oki earthquakeіEPSLє
355є231-243і
Imanishi, K., Ando, R., Kuwahara, Y. (2012) Unusual
shallow normal-faulting earthquake sequence in
ɪĘŝɃRŝŦ4:єɪĘŝɃŸǋʶʩŝЪ
̅˺ċ:ǻĎū5ђImanishi et al., 2012)єɪĘŝɃŸ
ǋʶʩŝЪ̅˺̍ǮMє2011 ǌ 4 ɜ 11 Ɇ:̧Ʒ
̑ʾϨNŝЪ̅˺̍ċ:ǻĎū(Otsubo et al., 2013)
ȧƐ$P3OіE-є̧Ʒ̑ʾϨNŝЪɐ8ʹē
&-ˍxƴɁƮL>±ȎʫɁƮ:˃ϼǧˮє
compressional northeast Japan activated after the
2011 off the Pacific coast of Tohoku earthquake.
GSL, 39, L09306.
Otsubo, M., Shigematsu, N., Imanishi, K., Ando, R.,
Takahashi, M., Azuma, T. (2013) Temporal slip
change based on curved slickenlines on fault scarps
Fukushima et al. (2013)8LNȧƐ$P3Oі¾
:ǻĎL>ɁƮǧˮSI58єĶɁƮа8Ò˼(
OǻĎSΦ̀&єɁƮ:ʹēǿSΔ( slip tendency
ђMorris et al., 1996ѓSΦ̀&-і
along Itozawa fault caused by 2011 Iwaki
earthquake, northeast Japan. Tectonophysics, 608,
970-979.
Fukushima, Y., Takada, Y., Hashimoto, M. (2013)
Complex ruptures of the 11 April 2011 Mw 6.6
Iwaki earthquake triggered by the 11 March 2011
ћі ɁƮʹēǿ:ɐЏŲė
Mw 9.0 Tohoku earthquake, Japan. BSSA, 103,
1572-1583.
Morris, A., Ferrill, D., Henderson, D. (1996)
Slip-tendency analysis and fault reactivation
Geology, 24, 275-278.
Φ̀$P- slip tendency MєɪĘŝɃŸǋʶʩ
ŝЪ:ċǮ4єˍxƴɁƮL>±ȎʫɁƮ:ʹē
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ċ:ǻĎū4;єˍxƴɁƮL>±ȎʫɁƮ;
)PIÌ slip tendency :ãṢ&єʹēǿÌ
0-5ȧƐ$POіɃєɪĘŝɃŸǋʶʩŝЪǮ
- 30 -
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Miyashita, Y., Manaka, M., Itoh, J., Kobayashi, K., Kamei, A.
& Fukushi, K. (2012) A new method for evaluating fault
activity based on fault gouge properties. Abstracts Volume
of 34th International Geological Congress. 29.3 #411
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Αχȿ 2012 Appendix ɁƮ^Xg:Ƴ̚ІˬƉ̉
˭Ƕ8ŧ2ɁƮ:ʹēǿά×і
https://unit.aist.go.jp/dgcore/research/document2012/
ȓΑχȿ 2012_ɁƮ:ʹēǿά×Ȑʱ.html
Miyashita, Y. (2014) Correlation between fault activity
and fault gouge color: toward the development of a
new method for evaluating fault activity.
Proceeding of the 5th International INQUA
Meeting on Paleoseismology, Active Tectonics and
Archeoseisimology, 48-50, 2014.
- 31 -
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Gosse, J.C. and Phillips, F.M. (2001) Terrestrial in situ
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1475-1560.
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G -ƊƏ͢˺Ȍɳ̮:ą˼і地形є 35-2, 187-197.
Shiroya, K., et al. (2010) Quantitative determination of
long-term erosion rates of weathered granitic soil
surfaces in western Abukuma, Japan using cosmogenic
10Be and 26Al depth profile, GJ, 44, e23-e27.
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講演要旨集（GSJ 研究資料集 no. 610 PDF / 3.2 MB）

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