Sedimentology, Holocene Sedimentation Rates, and Activity ... · ˘ ˇ ˆ ˙ ˝˛˚˜ !"#$˝%"...
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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
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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.
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Fig. Table
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Analytic
INTCAL Hughen
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Table . Results of radiocarbon age determination
Table
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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
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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
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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,
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