7
腄腆 腽膹膛腗腎腠膪臦 臜膂臓 腅腁 腅腁 腅腁 膨膕膓膴臉膥膚膔膵臙膭膻 膚膔臸 膨膕膓膴臉膥膚膔膵膌臗臈膚膔腯腹腰腂 腞臱膯 腞臬臒腫臀臠腒腩膑臇腲腂腰腚腜腨臩腩 膉臡腞臗臈腌膌臧腑腘臙膾腌臯臃腒腩腚 腔腞臙膾臧 臗臈腾臧腝腦腨 腺腑腘腈腩臱膯 腞臬臒腫膘臠腒 腝腦腨膉臡腝腊腈腘腤膰 膈腥膐臄 膀膼膆腥臞 腩腏腚腙臗臈腞膌臧臬臒腥膌臧膎膋腝膏腒腩膻 腫臩腩 臄腜腛 膸腚臨 腜膟膷腌臯臃腒腩腏腚腌臘腧腪腘腈 腏腚腤腙腍腩 腉腠 膣腼腡腋 腉腠 膅臆 臚膝 腢腕臑臅臌臤腌膳臺腝 臫腝臯臃腑腕臭臣臰臥臙膾腙腟 腔腞 臌腈膺膵腙腟 臗臈腞 腺腝腦腖腘臃腓腩膉臡腞膁自腟 膾膞腟膉臡膅腝腇腨 膱腝膉臡腝臎膧腒腩膌臗臈腌膌臧 腔腞膠腞臑臅 膩腞臟臅腝腦腖腘臼膍膆腐腪腩 腑腕 膌臧腑腕腚膢腉腧腪腩膌臗臈腞臎膧腟 腒腙腝 膃臏腡腋 膉臡腞臼膍膆腟膉臡腞臲膶腜膁自 臆腡腋 腥膃臏 腝腦腖腘膿膬腐腪腘腈腩 腞膁臙腝腟腦腨臐腎腞 膩腌臑臅腒腩腏腚腙臕臂腐腪腩 腔腞腺臛腥 臍臁 膌臧臤腝腗腈腘腟膜膇腌腻腜腖 腞腙 臗臈臶膖腞臑臅臌臤腞臙 臢臺臷腟臗臈腾臧腞 腕腨 腞腢腢腙腇腖腕 腏腞腕腣 膨膕膓膴臉膥膚 腝膏膗腒腩腚膢腉腧腪腩 腐腧腝 臗臈膲 腋腧臩腧 膔膵腙膊臯腐腪腕腮腷腂腳腵腸腱腱腶腹腴腸臱膯 膄臮 腪腕膉臡臑臅臹腭腬腞臑臅臌臤腟 臱膯 膄臮臖膦膒 臖膦臊臛腝腦腩膉臡膡臋腞臝膦腌膮膫腐腪腕 腼膸腡 臚膝 腼膸臔至 臏膸臻致 膃臏膤膽 腇腄 腄腊 腅腁腆腃 腙腕腚腗腏腛腇腄腓腐腌腜 腊腍腎腓腐腒腖腂腉腔腑腄腉 腘腋腈 ῌῌ 313 Bull. Earthq. Res. Inst. Univ. Tokyo Vol. pp. * e-mail : [email protected] Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology, Active Fault Research Center, National Institute of Advanced Industrial Science and Technology Five sediment cores were collected from the shelf west of Noto Peninsula where the submarine active fault that generated the Noto-hanto earthquake is located, to clarify the activity of the fault. A total of radiocarbon age determinations using molluscan and echinoderm shells sug- gested that the average sedimentation rate during the Holocene in the study area was around cm/ky. Judging from the sedimentation rate and sediment thickness above a ravinement surface, the age of the surface was calculated to be . . ka. This shows that the surface was formed according to the postglacial transgression after the last glacial maximum. Using the sedimentation rate, the fault activities recorded in the seismic reflection profiles occurred at around ky intervals in Holocene. Precise age determination allows us to estimate the ages of reflectors in the seismic reflection profiles and give us information on submarine fault activities. : sedimentation rate, ravinement surface, active fault, radiocarbon age determination, Noto-hanto Earthquake * Ken Ikehara *, Takahiko Inoue , Fumitoshi Murakami and Yukinobu Okamura Abstract Key words Sedimentology, Holocene Sedimentation Rates, and Activity of Submarine Active Fault at West of Noto Peninsula + , + , + + + , + + + , 2, ,**1 -+- -+3 -*/ 2/01 +++ 1 ,**1 -, ,** ++ 0 +/ 2 ,- ,**1 ,**0 ,**, ,**1 - ,/ +33, ,**/ ,**1 +

Sedimentology, Holocene Sedimentation Rates, and Activity ... · ˘ ˇ ˆ ˙ ˝˛˚˜ !"#$˝%" &’()#$ *+ ,-. /0 1 ˝1 23!4. & 1 45) 6789 : , ; #$< ˝ = > !?˝@a5 bcdef7gh

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Page 1: Sedimentology, Holocene Sedimentation Rates, and Activity ... · ˘ ˇ ˆ ˙ ˝˛˚˜ !"#$˝%" &’()#$ *+ ,-. /0 1 ˝1 23!4. & 1 45) 6789 : , ; #$< ˝ = > !?˝@a5 bcdef7gh

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313

Bull. Earthq. Res. Inst.

Univ. Tokyo

Vol. pp.

* e-mail : [email protected]

Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and

Technology, Active Fault Research Center, National Institute of Advanced Industrial Science and

Technology

Five sediment cores were collected from the shelf west of Noto Peninsula where the submarine

active fault that generated the Noto-hanto earthquake is located, to clarify the activity of the

fault. A total of radiocarbon age determinations using molluscan and echinoderm shells sug-

gested that the average sedimentation rate during the Holocene in the study area was around

cm/ky. Judging from the sedimentation rate and sediment thickness above a ravinement surface,

the age of the surface was calculated to be . . ka. This shows that the surface was formed

according to the postglacial transgression after the last glacial maximum. Using the sedimentation

rate, the fault activities recorded in the seismic reflection profiles occurred at around ky

intervals in Holocene. Precise age determination allows us to estimate the ages of reflectors in the

seismic reflection profiles and give us information on submarine fault activities.

: sedimentation rate, ravinement surface, active fault, radiocarbon age determination,

Noto-hanto Earthquake

*

Ken Ikehara *, Takahiko Inoue , Fumitoshi Murakami and Yukinobu Okamura

Abstract

Key words

Sedimentology, Holocene Sedimentation Rates, and

Activity of Submarine Active Fault at West of Noto

Peninsula

+ ,

+

,

+ + + ,

+ + + ,

2, ,**1 -+- -+3

-*/ 2/01 + + + 1

,**1

-,

,**

++ 0 +/ 2

, -

,**1

,**0

,**, ,**1 - ,/

+33, ,**/ ,**1

+

Page 2: Sedimentology, Holocene Sedimentation Rates, and Activity ... · ˘ ˇ ˆ ˙ ˝˛˚˜ !"#$˝%" &’()#$ *+ ,-. /0 1 ˝1 23!4. & 1 45) 6789 : , ; #$< ˝ = > !?˝@a5 bcdef7gh

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Fig. . Location of piston coring and seismic survey

line shown in Fig. by Inoue

Table . Position and water depth of the coring sites

Fig. . Photograph of a piston corer used for

sediment sampling.

GPS

Fig. Table

m

X

Beta

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Fig.

Line

A, B D, E

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et al.,

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Page 3: Sedimentology, Holocene Sedimentation Rates, and Activity ... · ˘ ˇ ˆ ˙ ˝˛˚˜ !"#$˝%" &’()#$ *+ ,-. /0 1 ˝1 23!4. & 1 45) 6789 : , ; #$< ˝ = > !?˝@a5 bcdef7gh

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Analytic

INTCAL Hughen

Calib . .

Stuiver and Reimer, cm

R

cm

cm ;

cm

Ikehara

X

Table

Fig.

Ohta

A

B cm C

cm D cm E cm

Fig.

B, C, D

B, C cm

E m

cm C

Fig.

et al.,

et al.,

et al.

*. ,**.

/ * ,

+33- *

*

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+**

,***

+/

,**+

+330

/

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-

+331 ,**.

+3- +2,

-.0 0/ +32/

-

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+

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D

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Page 4: Sedimentology, Holocene Sedimentation Rates, and Activity ... · ˘ ˇ ˆ ˙ ˝˛˚˜ !"#$˝%" &’()#$ *+ ,-. /0 1 ˝1 23!4. & 1 45) 6789 : , ; #$< ˝ = > !?˝@a5 bcdef7gh

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Table . Results of radiocarbon age determination

Table

Fig. m

B, C, D

cm Ra

A

: Ra Ra A

Ra

B Rb A, B, C, D, E m,

m, m, m, m

Ra Rb m

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Page 5: Sedimentology, Holocene Sedimentation Rates, and Activity ... · ˘ ˇ ˆ ˙ ˝˛˚˜ !"#$˝%" &’()#$ *+ ,-. /0 1 ˝1 23!4. & 1 45) 6789 : , ; #$< ˝ = > !?˝@a5 bcdef7gh

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317

Fig. . Sedimentation rate of each core.

Fig. . Seismic reflection profiles crossing the coring sites.

m, m, m, m

m, m Fujii and Fuji

m

E m

cm cm Ra

E

A

A

A

A-

.

+33.

/2 03 2* 1, + .*

10 +32, +301

0* 2*

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+ ,**

-0

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Table . Sub-bottom depths of the characteristic reflectors found in seismic reflection profiles at

the coring sites

Fig. . Seismic reflection profile crossing the coring

site A and B showing the characteristic reflectors.

B A

A

B, C, D A B

Rb

Rb

B

A

A B

A

Fig. ;

A, B, C A, B, D, E cm

Rb Ra A, B, C

Table

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D E Line

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319

.

.

.

no. p.

no. p.

.

Ohta, A., N. Imai, S. Terashima, Y. Tachibana, K. Ikehara

and T. Nakajima, , Geochemical mapping in Ho-

kuriku, Japan : influence of surface geology, mineral

occurrences and mass movement from terrestrial to

marine environments, , ..

Fujii, S. and N. Fuji, , Postglacial sea level in the Japa-

nese Islands, , .

no. ..

Hughen, K.A., M.G.L. Baillie, E. Bard, J.W. Beck, C. Bertrand,

no. CDP.G. Blackwell, C.E. Buck, G. Burr, K.B. Cutler, P.E. Da-

mon, R.L. Edwards, R.G. Fairbanks, M. Friedrich, T.P.

Guilderson, B. Kromer, F.G. McCormac, S. Manning, C.

Bronk Ramsey, P. J. Reimer, R.W. Reimer, S. Remmele,

.J.R. Southon, M. Stuiver, S. Talamo, F.W. Taylor, J. van

der Plicht and C.E. Weyhenmeyer, , MARINE

marine radiocarbon age calibration, cal kyr BP,

:, .

Stuiver, M. and P. J. Reimer, , Extended C data baseIkehara, K., H. Katayama and T. Nakajima, , Mode of

and revised CALIB . C age calibration program,mud deposition on shelf to basin area o Akita, north-

, .east Japan Sea, , .

Received February ,

Accepted March ,no. p.

Applied Geochem.,

Jour. Geosci., Osaka City Univ.,

Ra-diocarbon,

Radioceabon,La mer,

+.

+.

+331

/++ /,3

,**1 ,**1

-*+

-+,

,**/

13+ 2+*

,**+

/1 .2

,***

/- .+

+32/ 23

+*-

,**.

,**0+./- +.031.3 1/3

+301+33,.- /+

+32,.* 0/ 1.+2- +3-

,**1

0+

,***

.-3 ..3

,**,,**. *.

* ,03/ +*2+*/3 +*20

+33-+330- *#

,+/ ,-*+-1 +/+1 ,**2+33.

. ,**2., /0

+3

.2

2,

++.

0*

+3++,

+*

,+

-3

.0

-/-.