Transcript
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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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.

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B, C cm

E m

cm C

Fig.

et al.,

et al.,

et al.

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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

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cm Ra

A

: Ra Ra A

Ra

B Rb A, B, C, D, E 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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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-

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Page 6: Sedimentology, Holocene Sedimentation Rates, and Activity ... · ˘ ˇ ˆ ˙ ˝˛˚˜ !"#$˝%" &’()#$ *+ ,-. /0 1 ˝1 23!4. & 1 45) 6789 : , ; #$< ˝ = > !?˝@a5 bcdef7gh

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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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Line

D E Line

Line 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

-/-.


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