K<LM J. Hot Spring Sci. 0* +./ῌ+0* ,*+*ῌ῍ῌ   , NO P+ QR 1, STUV- N(WX+ Y Z[+ ,,.

0  ,,2,

High Temperature Hot Springs and Their Geological
Structures of the Central and Southern Part ofKinki District, Japan (,)\From the Results of the Electromagnetic Survey around
Shirahama and Arima Hot Springs\Susumu NISHIMURA+, Akira, JOMORI,, Itsuo KAWASAKI-,Junichi NISHIDA+ and Ikuo KATSURA+

Abstract
There are some hot-springs having high temperature and high concentration ofchemical components at the middle and southern part of Kinki District, but these are norelated to any volcanism. The ﬁrst report has been cleared the evidences of the necks ofacidic igneous intrusions in Nanki-Shirahama and Arima Hot-springs, using the results ofgeological study and gravity survey.
This second report is discussed that these springs are rise up along the crushed zoneof the active faults through the neck of igneous intrusion, of which ages are estimated+,ῌ+. Ma using the results using the methods of radioactivity and CSA-MT survey (a kindof Magneto-Telluric method).
Key words : Nanki-Shirahama, hot-springs, Arima hot-springs, CSA-MT, Radioactivity
method, Neck of intrusion and Super-critical ﬂuid+ !"# 0*0ῌ2-*/ $%&'()*+ +. ,-.
/01234 + NPO Think-tank Kyoto Institute of Natural History, Kinkichiho Hatsumei
Center, Yoshida kawaramachi +., Sakyoku, 0*0ῌ2-*/. Japan.
,56789:; /3*ῌ*/,+ <=$>? .ῌ,ῌ-* , Neo-Science (Ltd), Tarui .ῌ,ῌ-*, Sennan-shi,/3*ῌ*/,+, Japan.
-@AB9ῌ3ῌC3D /12ῌ*+*0 EFG$HIJ +ῌ.ῌ+- - J-C-R & Co., Ltd. Naka-shinkai+ῌ.ῌ+-, Higashi-Osaka /12ῌ*+*0, Japan.

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12%&! "#/ 3$425%&'67 8(9):;<= +,ῌ+. Ma >*?.
+,:3:--$@?. ':-(ABC !.BDB/EFG !01?2
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I 1&2J4K2L. ? ? MN
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:-(7ABC2H?#W.=1%,67>7X?Y@Z MT : MagnetoTelluric A42B[CA467'02\02%W.
]^_^` : 1  CSA-MT B[CA4 :- DEa+3+    ῌ FG %H$%-!" 0"!%bcde2I'f"g$02 .BDB/hijkclEFG !01?#Jm.DE
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L!"

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dj F/¡cdF¢£f" 'p

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 5¨2X

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ῌ  ,

Fig. + Classiﬁcation of ,-,Th, ,-/U and ,-2U decay series nuclides into groups showing mass
number, half-life and mode of decay.

Fig. , Gamma-ray spectra of examples of sides of Gosho and Uwanari ‘Kin-sen’ hot-springs
and Zuihoji-koen radioactive spring, using Aloka JSM-+*, (,.* ch., -.0 MeV).

147

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   

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Fig. - The distribution of active faults and high radioactive zones (higher than *., mSv/h) estimatedby gamma-ray survey with main hot and radioactive springs in Arima town, Kobe City.
 : high-temperature (higher than 3* hot-spring,: hot spring (230*), : and  : carbureted and/or radioactive spring.
: fault and: high radioactivity area in soil-air.

 !" #$%&'( ) !*+,+-./0123 +/ m

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ELF-MT x? extremely low frequency : +**+*. Hz *#$"#i.#x? F%

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#3,-m{a G.x?#tua|{#.7 T-)CD"F ^ |{& ¡,E¢&£¤¥O¦¥OM+G§ )]+  ῌ/0 +320 , ELF-MT ¨123 + © , ©"ª« ¬4

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XYZ7 X"#$ X"[ X" %[\]^_[&ῌ`&'(a)C:`)*b +c$%  '(',defX  -$ghXijhXῌ-Xk$-I-  " ]4^_+.l/)m60)*b4n' o%pq#$12."0)*b4n@67
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Y:¢£@+Z[-n')*bG4_)*b

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E ?¬% Vῌm f lVm Hz -I

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   Fig. /Fig. 0150

    

The distribution of CSA-MT measurement points in Arima area.

The distribution of CSA-MT measurement points in Nanki-Shirahama area.

( 0* D ,*+**:;#$%ῌ&<! =<#>?' ,*
Table +The speciﬁcation of CSA-MT measurement
()*-

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Fig. . The distribution of active faults estimated by gamma-ray survey with estimatedthe neck of acid igneous intrusion using gravity anomaly and distribution higher
than 1* hot-springs (Nihsimura et al., ,**3) in Nanki-Shirahama, Wakayama Pref.
: active fault with high g-activity area in soil-gas estimated by gamma-ray survey,
net area : neck of acid igneous intrusion, and  : higher than 1* hot-spring.

Fig. 2

The resistivity map at the elevations of -** m, ,** m and +** m in Arima area.

153   Fig. 3    

The resistivity sections along A-Aῌ, B-Bῌ, D-Dῌ and E-Eῌ lines in Arima area.

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Fig. ++

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The ﬂow chart of the two dimensional analysis of CSA-MT method (NeoScience).

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Fig. +, The resistivity map at the elevations of sea-level, +** m, ,** m, .** m and 0** min Nannki-Shirahama area.

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Nishimura, S. and Katsura, I. (+33*) : Radon in soil gas : Applications in exploration and earthquake prediction. In Geochemistry of Gaseous Elements and Compounds (eds., Durranceet al.), pp. .31ῌ/--, THEOPRASTUS Pub. S.A., Athens.

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