vol. pp. 2, ,**1 ,// ,0
TRANSCRIPT
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Bull. Earthq. Res. Inst.
Univ. Tokyo
Vol. pp.
* e-mail : [email protected]
The Noto Hanto Earthquake, syn-rifting succession, stratigraphy, earthquake source
fault, geologic structure
Dia Consultants Co., Ltd, Earthquake Research Institute, University of Tokyo
Stratigraphy and geologic structure in the onshore epicentral area of the Noto Hanto
earthquake was studied to reveal the relationship between the earthquake source fault and geologic
structure. The epicentral area is located in the southern part of the Yamato basin rift-system and
thick syn-rift succession is exposed on the Noto peninsula. Exposed Paleogene to Miocene rocks
overlying the Jurasic granitic rocks are divided in ascending order into Daifukuji, Ohkadoma,
Anamizu, Nawamata, Touge, Sekinohama, Maehama Formations, and Kurosaki Andesite. The Dai-
fukuji and Okadoma Formations consist of sedimentary rocks deposited at the Paleogene pre-rifting
stage. More than , m thick, Oligocene to lower Miocene andesitic volcanic rocks and fluvial
sediments (Anamizu, Nawamata and Toge Formations) were deposited, filling half grabens bounded
by ENE-WSW- and NS-trending faults. They are syn-rift sediments formed at the rifting and open-
ing stage of the Sea of Japan. Middle Miocene shallow marine sedimentary rocks (Sekinohama and
Maehama Formations) unconformably cover the syn-rift succession. A major geologic structure
was formed by rifting associated with the opening of the Sea of Japan. The source fault of the
Noto Hanto earthquake trending NE to ENE coincides with the fault bounding the Miocene halft
graben, and its eastern end corresponds to the NS-trending fault, a probable transfer fault during
the rifting stage.
:
Fig.
*
Nobuyoshi Tomioka * and Hiroshi Sato
Abstract
Key words
Geology of the Onshore Epicentral Area of the Noto
Hanto Earthquake, Central Japan
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Middle Miocene sedimentary rocks, ; Oligo-Miocene
Fig. . Index map showing the study area. ; early
volcanic rocks
Kano ;
Ma
Fig. Mur-
phy and Salvador,
Fig. Fig. Fig.
Fig.
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; ; ; Kano ; ;
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; ; Lopez and Ishiwatari, :
Tatsumi
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et al.,
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Fig. . Stratigraphic correlation between this study and published data.
m
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Fig. . Stratigraphic columnar section of the northwestern part of the Noto Peninsula. * : Kouno and Ueda ( ),
* : Shima ( ), * : Hayase and Iwasaka ( ), * : Hiroi ( ), * : Yamada ( ), * : Tsukamoto
( MS), * : Shibata ( ), * : Ue ( )
m
cm cm :
et al. et al. et al.et al. et al.
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, +303 - +301 . +32, / +320 0
+322 1 +32+ 2 +32+
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Geologic map of the study area. O shore active faults are modified after Inoue ( ). Base map is the topo-Fig. .
graphic map of : “Minazuki”, “Monzen”, “Turugiji” and “Shimokarakawa” by Geographical Survey Institute.
Quaternary deposits are not illustrated except for the Middle terrace deposits, sand dune deposits and Alluvium.
et al.# ,**1
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m cm
sp., sp.
sp., sp., sp., m
sp.
;
: m
m
m
Okada and Burkry CN
CN a Table
: D
A D
D D
D
m
:
Ma
D
. . Ma K-Ar
C
C
Anadara Ostrea
Cardium Ostrea Hiatella?
Anomania
,**1
+* -* 2
+30/ ,**+
.*3
+30/ ,**/
+33+ .* 0*
+30/
+30/
,*
2*
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+32* .
/ +
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,
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+30/
+30/
+0 +/ +33,
+32+ +
2 0. * 0-
+332
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and around the aftershock area of the Noto Hanto
Earthquake, , .
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264
ing of the Sea of Japan back-arc basin by asthenospheric
syn-rifting succession, northern Noto Peninsula, Japan :
Evidence for short-term uplifting precedent to the rapid
. .
Lopez J.C. and A. Ishiwatari, , Petrogenesis of the tholei- Okada, H. and D. Burkry, , Supplementary modification
itic basalt, calc-alkaline basaltic andsite and high mag- and introduction of code numbers to the low-latitude
nesian andesite lava succession of the Oligo-Miocene cocolith biostratigraphic zonation (Burkry, ; ).
Anamizu Formation in northeastern Noto Peninsula, Marine Micropaleontology, , .
central Japan, , . no.
Kano, K., K. Kosaka, A. Murata and S. Yanai, , Intra-arc CD
deformations with vertical rotation axes : the case of Otofuji, Y., Matsuda, T., and Nohda, S., , Opening mode
the pre-Middle Miocene terranes of Southwest Japan, of the Japan Sea inferred from the paleomagnetism of
Tectonophysics, , . the Japan arc, , .
Kano, K., T. Yoshikawa, Y. Yanagisawa, K. Ogasawara and Sakai, S., A. Kato, T. Iidaka, T. Iwasaki, E. Kurashimo, T.
T. Danhara, , An unconformity in the early Miocene Igarashi, N. Hirata, T. Kanazawa and the group for the
joint aftershock observation of the Noto Hanto
Earthquake, , Highly resolved distribution of after-
opening of the Japan Sea, , . shocks of the Noto Hanto Earthquake by a dense
seismic observation, , .
.
K-Ar
p. .
p.
p.
p. .
K-Ar .
. Fission track
Kato A., S. Sakai, T. Iidaka, T. Iwasaki, E. Kurashimo, T. K-Ar .
Igarashi, N. Hirata, T. Kanazawa and Group for the Shimazu, M., S. Yun and M. Tateishi, , Tectonics and
aftershock observations of the Noto Hanto Earth- volcanism in the Sado- Pohang belt from to Ma
quake, , Three-dimensional velocity structure in and opening of the Yamato Basin of the Japan Sea,
the source region of the Noto Hanto Earthquake in , .
imaged by a dense seismic observation, Tatsumi. Y., Y. Otofuji, T. Matsud and S. Nohda, , Open-
, .
injection, , .
p. K-Ar
.
.
.
;
. .
K-Ar Dating
. .
.
Mann, P., Hampton, M.R., Bradley, D.C., and Burke, K., ,
Development of pull-apart basins, p.
, no. , . Received February ,
Murphy, M.A. and A. Salvador, , International Stra- Accepted March ,
tigraphic Guide : An Abridged Version, Episodes, , ,
J. Min. Petrol. Sci.,
Nature,
Island Arc,Earth Planets Space,
Tectonophysics,Earth Planets
Space,Tctonophysics,
Journal of Geology,
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