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255

Bull. Earthq. Res. Inst.

Univ. Tokyo

Vol. pp.

* e-mail : n.tomioka@diaconsult.co.jp

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.

Fig. ; ;

Ma Ma

; ; ; Kano ; ;

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; ; Lopez and Ishiwatari, :

Tatsumi

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257

Fig. . Stratigraphic correlation between this study and published data.

m

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258

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

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et al. et al. et al.et al. et al.

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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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Fig. . Geologic sections of the study area. Location of the sections is shown in Fig. .

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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/

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2*

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+32* .

/ +

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, +

,

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2 0. * 0-

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262

Table . Correlation of the geological stratigraphy of the onshore epicentral area of the Noto Hanto

earthquake to the standard stratigraphy of the Hokuriku district, and acoustic stratigraphy of the

o shore epicentral area.

C C

B B B B

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Rb-Sr

.

.

p.

Honda, R., Y. Hiramatsu, Y. Kono and H. Katagawa, ,

Gravity anomalies and the geologic block structures in

and around the aftershock area of the Noto Hanto

Earthquake, , .

.

Honda

NE ENE-WSW

Fig. NS

Mann

Kano

NNW-SSE

ENE-

WSW Fig. ;

Sakai ;

Kato Earth Planets Space,

et

al.,

et al.,

et al.,

et al.,

et al.,

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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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