25
腄腆 膩膫 膩臲膚臹臜膲膨臕腅 腅腁 腅腁 腅腀 腅腁 腅腀 腅腀 腅腀 膆臹臜臵臃膲膨腲膂腂腽 腍腝 膕膎腊腧臺 腜腊腌腗腝腼腮膁腻膄膕腽膃腂腹 腸腂腵腜腖腈腗腞 腜腦腕腗膔 腡臂腡腝膽臬膦腟臺 腬膽臟腑腩 膶臹膘 臣腎腪 臭臨膏腝臹膘膽臬腙腙腤腜 腓腝 腡臂 腾膄腹膂膽臬腬膔 腑腩腔腣腝臲膡 腛膕 膽臬 腢腽膃腂腹腝膽臬腋 臑腎腪腗腈腩 腓腝膸 膕膆腙 臵臃腋 膱腜臍臊腎腪腔 腍腝臵臃 腸腂腵腬膿腫腒腔膔臣腤膾腫腪 膐膚膣臒腴膄腵腂 膵膕 膲膨膖 膠膽 膧腣腧腪腔膽臬腊腧臗臓腝 膈腙腏腗 膩臲膚臹臜膲膨臕腬腞腐腣腙腑腩臩臁腝臲膚 膝膮膠膝 腡臂腢膕 腽膃腂腹腊腧腝臞腝膒臅腋 臖腎腪腔 腙腝膪 腘臍臊腎腪腔腤腝腘腇腩 腍腝臵臃腝臭臨腞 腜臺膋 臄膓膤腊腧臑腎腪腔 膕臹臜自 臜膴 臀腘腞 腍腝 腝膕 臵臃腜腉腌腩 膆腬 膹腜臐臷腏腗腉腨 腓腝膕膆 腜腖 腝膜臭膗 腬臌腑腙腙腤腜 腧腪腔臹臜 膯膢 腈腗腞膕 膐膚膣臒腴膄腵腂腜腦腕腗 臱腝膕 臹臜 腥臔 臫臋腛腚腝膞 腛腸腂腵腬 臑腑腩 膰腙腰腭腱膄腳膀腷腹腜腦腩 膬臦 臹臜臵臃腋 膾腫腪腔 膆臭臨腞 腓腝 腘自 臜膴膆腝 臡腝 臶腬 臵臃腝 腝臭臨腞 臢膍膳 腓腝臺 腘臺膋膽臬臨腬臥腕腗腈腩 膼腜腓腝 腊腧臤臧膳膉臆膭臉 膵膉臆膭 腘腞 臖腎腪腔臚膛 臛膷 臉臞臻 腠腘腝臩臼 腘腇腩 臝膺臜膴腙腏腗腶 臺臰腬 膹腬膌臷腏 膕腜至腏腗腈腩 腯腺腾腯腹腬臇 腬臤臧膳膉臆膭臉 膆臭臨腞臩臁腝臲膚 膝膮膠膝腋致 腶腯腺腾腯 膵膉臆膭 至臉臞臻 膳膥臘膭膑膿臮 臙腬 腈腔膬臦 膻膙 臵臃腋膾腫腪腔 臯臈膑膿臻 膳膊 膭膏 膵膏 膅臸膳 膆臹臜臵臃膲膨腲膂腂腽 腈腛 腘腪 腘腐腢 腏腘 腢腜 腘腚 腢腅 腞腪 腏腘 腕腇 腙腇 腕腇 腐腢 腘腪 腆腃腇腄 腑腎腅腋腗 腔腊 腓腕腒腖腄腁腂腈腘腉腏腕腒腌腍腐腑腎 ῌῌ 77 Bull. Earthq. Res. Inst. Univ. Tokyo Vol. pp. * e-mail : [email protected] An extensive onshore-o shore seismic refraction/wide-angle reflection experiment was under- taken in . The profile line was extended from the eastern part of the Nankai trough to Central Japan. The land profile line of -km length was laid from the Tokai district to the coastal region of the Sea of Japan, crossing an expected fault area of the forthcoming Tokai earthquake, an aseismic slip region north of the fault area, the Median Tectonic Line and the Niigata-Kobe Tectonic line. On this profile, receivers were deployed to observe dynamite shots with kg charge. Data obtained are of good quality, from which clear first arrivals are traced beyond km o sets. The most important feature in these data is strong reflection from the subducted Philippine Sea plate observed in the southernmost part of the profile. This paper presents the outline of this seismic expedition and fundamental data obtained. : crust, plate structure, subduction, Philippine Sea plate, Central Japan Iidaka Fig. Kodaira aseismic slip Kodaira NNW-SSE aseismic slip Ozawa Sagiya km NNW-SSE J -J The Research Group for Seismic Expedition in Central Japan et al. et al., et al., et al., et al. Abstract Key words Deep Seismic Refraction/Wide-angle Reflection Profiling in Central Japan 2- ,**2 11 +*+ ++- **-, +++ # ,**+ ,0+ -3+ 0 +** /** +,* +0* # ,**+ ,**- ,**. ,**+ 2 + ,**/ ,**. ,**+ ,**+ 1* ,**, ,*** ,0+ + / + ,

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Page 1: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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77

Bull. Earthq. Res. Inst.

Univ. Tokyo

Vol. pp.

* e-mail : [email protected]

An extensive onshore-o shore seismic refraction/wide-angle reflection experiment was under-

taken in . The profile line was extended from the eastern part of the Nankai trough to Central

Japan. The land profile line of -km length was laid from the Tokai district to the coastal region

of the Sea of Japan, crossing an expected fault area of the forthcoming Tokai earthquake, an

aseismic slip region north of the fault area, the Median Tectonic Line and the Niigata-Kobe Tectonic

line. On this profile, receivers were deployed to observe dynamite shots with kg

charge. Data obtained are of good quality, from which clear first arrivals are traced beyond

km o sets. The most important feature in these data is strong reflection from the subducted

Philippine Sea plate observed in the southernmost part of the profile. This paper presents the

outline of this seismic expedition and fundamental data obtained.

: crust, plate structure, subduction, Philippine Sea plate, Central Japan

Iidaka

Fig. Kodaira

aseismic slip

Kodaira

NNW-SSE

aseismic slip Ozawa

Sagiya km

NNW-SSE J -J

The Research Group for Seismic Expedition in Central Japan

et al.

et al.,

et al.,

et al.,

et al.

Abstract

Key words

Deep Seismic Refraction/Wide-angle Reflection

Profiling in Central Japan

2- ,**2 11 +*+

++- **-, + + +

#

,**+

,0+

-3+ 0 +** /**

+,* +0*

#

,**+

,**- ,**.

,**+ 2 + ,**/

,**.

,**+ ,**+

1*

,**,

,*** ,0+

+ /

+

,

Page 2: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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78

Fig. . Location map of the seismic expedition.

Six shots (J -J and T ) of -kg charges on

the onshore line are shown by stars. Our onshore-

o shore profile is running across the expected fault

area of the forthcoming Tokai earthquake indicated

by a pink area. The onshore line is also crossing

Median Tectonic Line (MTL) and the Niigata-Kobe

Tectonic line. The aseismic slip area in the Tokai

district (Ozawa ( )) is located west of the

southern part of our profile (south of J )). Receiver

points of the onshore line are indicated by small

circles.

Table . Shot time, location and charge size of seismic expedition.

Fig.

kg J -J

Texas kg T

J -T

Table

. mm, J -J . .

m, T . m

m

Fig.

J -J T

. . . . . . km s

Table J -

J Table

LS

Mark Products L- D

. Hz, . k

. ms

DAT

km

km Table

ms

L B . Hz

+ ,**+

+ / 0 +** /**

#

,**,

.

+ ,**+

/ + ,**+

/** . /

+** 0

- 0

+

+*/ - + / 1/ , 1/ 2

0 -* +

+ 2 ,/

,0

/* . 0

,

+ / 0

+ 0 , . / / . 3 . , - 0

, , +

/ -,2 ,

+ -,2

2*** +330

,,

, , , ,

* 1 +*

+331

0*

+ 0- , .*+

.0- +*

,2 . /

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Page 3: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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& ��& 9 � @A � & � � B

C

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79

Fig. . Travel-time diagrams near shot points. These observations were performed to determine

seismic velocities at the shallowest part of the crust.

J km m, C

m J S N

L

S Iidaka

J -J . . sec

GPS

J -J

km s

ms km s km s

SEGY format Barry

Fig. km s

reduction

velocity km s J -J Fig.

km

km

Fig. Table J Fig. e

. s J km

A . s B

et al.

et al.,

,

/ 0* /**

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/ ./

+ , * / * 2

, / 0

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Page 4: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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Table . Receivers of seismic expedition., ,**+

Page 5: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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81

Table . (Continued),

Page 6: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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82

Table . (Continued),

Page 7: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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Table . (Continued),

Page 8: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

�� ������� ����

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(a)

(b)

84

Fig. . Record sections. Horizontal axis is an o set in km from the individual shot point. Travel time is reduced

for a velocity of km/s. Remarkable later phases are indicated by arrows. (a) J . (b) J . (c) J . (d) J . (e) J .

(f) T .

- #

0 + , - . /

0

Page 9: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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(c)

(d)

85

Fig. . (Continued)-

Page 10: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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(e)

(f)

86

Fig. . (Continued)-

Page 11: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

�� ������� ��������

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(a)

(b)

(c)

(d)

87

Fig. . Travel-time plots. The reduction velocity is taken to be . km/s. The horizontal axis is an o set in km.

The quality of travel time data is shown with di erent symbols (see text for explanation). (a) J . (b) J . (c) J .

(d) J . (e) J . (f) T .

. 0 * #

# + , -

. / 0

Page 12: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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(e)

(f)

88

Fig. . (Continued).

Page 13: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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89

Page 14: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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90

Page 15: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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91

Page 16: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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92

Page 17: Deep Seismic Refraction/Wide-angle Reflection Profiling ... · Vol. pp. *e-mail: iwasaki@eri.u-tokyo.ac.jp An extensive onshore-o shore seismic refraction/wide-angle reflection

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Kurashimo, T. Kawamura, F. Yamazaki, K. Koike and G.

Aoki, , Configuration of subducting Philippine Sea

plate and crustal structure in the central Japan,

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Iidaka, T., T. Takeda, E. Kurashimo, T. Kawamura, Y.

Kaneda and T. Iwasaki, , Configuration of subduct-

ing Philippine Sea plate and crustal structure in the

central Japan, , .

Kodaira, S., T. Iidaka, A. Kato, J-O Park, T. Iwasaki and Y.

Kaneda, , High pore pressure may cause silent slip

in the Nankai Trough, , .

Kodaira S., T. Iidaka, A. Nakanishi, J.-O. Park, T. Iwasaki

and Y. Kaneda, , Onshore-o shore seismic transect

from the eastern Nankai Trough to central Japan cross-

ing a zone of the Tokai slow slip event,

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Ozawa, S., M. Murakami, M. Kaidu, T. Tada, T. Sagiya, Y.

Hatanaka, H. Yarai and T. Nishimura, , Detection

and monitoring of ingoing aseismic slip in the Tokai

region, central Japan, , .

Sagiya T., S. Miyazaki and T. Tada, , Continuous GPS

array and present-day crustal deformation of Japan,

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Kate Miller

aseismic

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