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腃腅 膸臀膚膶臰膉臑臒臇 膀膞腺膠腮腪腰腫腲腬腱腭腲腯 臌膈臁腾臅膱膍膇膧 腡腜膃膻膝致腘腏腖 膱膎腵膣臣腜臅膟膬臤腩膅膖腐腧 膱膎臄膼腜膊膮腣膑腊腦 臖膵腐腧臅臘膔腽腚腙 腘腘腢腛 臅膱腾臈腛臫腥腉腛腎腨腖腇腧膱膎臄膼 至臅膱腛腤腧臚腽腝臅膟腾臈膭膌腛臁腋腌膜臕腎腨腧 臍腠腉 膱膎腵至腵腜臅膟膒膽腘腜膁臶腛腕 腏腓腊腔腖 臖膵腏腓臅膱腣臚腽腛腕腇腖臲腻腐腧腓腡腛 腇腖膦腟腧 腝 腒腜膫腜臅膟 臅膟膒膽腩臲腻腐腧腍腘腝膃臩臈腛膤 臱腗腆腧 臓臔臉臗臋臅膱腜膱膎腵腜臅膟 腛腕腇腖腝 腣臨至臅臦臊臭 臔臉臗臋腝臅膟膒膽膉臠膪腜臛膾膿臨腷腛腳臆腏腖腈 臅膟膲臢膙腴腶腺 腚腙腛腤腔腖膅膖腎腨腖腇腧 膹臂膗膋腜膃臘腝腹臸膂臵膆腞臡自膂臵腉腥腚腧 腇腑腨腢膨膥膡腜臅膟膲腛腤腔腖臜膏腎腨腖腇腖 腍腨腥腜膃臘膂腝膢腘腏腖臗臋臐臟腜膷臎 臥臃膘臅腛 膩膕腚臅膟膲腝膐臜腎腨腖腇腚腇 臠臞腐腧腠腉 臯膱腵臐臟腛膨膄臬腛臠臞腐腧 臔臉臗 腍腍腗腝 膱膎腵腜臅膟膒膽腣臅膱臚腽腩臲腻腐腧腓 臋腛膑腌臠臞腐腧臅膼腝臒臩腼腜膊膴腛膁臶腏腖膺膰膳 臝腸膯臧 膓臍臙臷膛 腄腁腅腂 腌腉腇腋 腏腐腍腑腎腌腊腃腊腈腆腒腆腃腌腉 255 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 + , + , + , + , 2, ,**1 ,// ,0. 32* *2*, +, -* ,**1 ,**1 + .** ,**1 ,**1 ,**1 + +30/ +311 +33- +33* + , ,**1 ,**1

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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

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phy and Salvador,

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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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CN a Table

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Cardium Ostrea Hiatella?

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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.

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Rb-Sr

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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

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Sakai ;

Kato Earth Planets Space,

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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