13
腅腉 臥膡臣臱膡膤 臢致 臲臢腥腎 腒腣腼膃腵腱腲腸腤 臥膡臙膓臛臉膪膝臃 臂臣臠膊臛臉腣臐臖臓腰膎臹腕腭腟腟腨腢 臛臉腢腪腭 腒腮腦腞臂臣膩腞腤 臙臌膘臥臛臉腩膫 膘臥臛臉腣 臭膐腣膨膬腟臂臣膛自膆膻腢膹腕腭腒腟腰臼臡腟腕腭 腪腌腡腼膂腂腸膢膏膥膠臙臛臉腏腑腬腎腍腔臬臍腔腝腐 臂臣臠膊臛臉臸膴 膬膴臨至腼膃腵腱腲腸 臱臰膌 腒腣腪腌腡腽腳腺腶膀腂腹 膞腣膠臙臛臉腣 膓臄腢腪腬膿膸腓腮腭腒腟腟腡腛腘 臲臢致 臬臍膗膒腤 臩腟臟腑 臙臌膘臥臛臉腎腫 臩膦腛腘膮膶 膽腣膠臙臛臉臬臍腦腞腢腤 腦腙臀膔腣 臂臣膩腞腣腼膂腂腸膱臔臞膳 臉膭臚臒腾腷膁臧腣膱臝 膼膗臡 腏腊腭 腔腎腔膍膟腣膺 腞腤 膠臙臛臉腏 臣膷膸臎腣臗臉臋臮膋 膛自膑臵腢膘腕腭膪膝 臬臍腕腭腊腋腙腣膚膗腢 膞腣臙臛臉腏臬臍腔 膰膈臡膙膛膕 膬膴臖臊腣膱臝腢膘腕腭膪膝腣 膯腩臥膡腢臙腐腡臭膐腰腨腘腫腔腝腋腭 臦膼腤膣臘臡 腜腣腴腻腼膃腵腱腲腸腎腫腡腭 腒腣腌腚腴腻腼膃腵腱 腡臛臉膖臕臻腏腡腎腛腘腘腧 腗腮腫 膞臛臉腣臉 腲腸 腞腤 臂臣膩腞臬臍腕腭 膞腣臙臛臉腣臆臃 膭腣膅臜 臈腓 膜臺腡腠腣臉膭 臑腣臅膵腤腯腎腫 膜臺 臬臍臯臤 腮臷腡腠腣臛臉臓腰膎臹腕腭腘腧腢 臂臣臠膊臛臉腣臛臉臓腏臫膄腞腐腝腋腡腋 腗腒腞 臛臉膧腰 腋腘膾臏臛臉膖臕腢腪腭腼膂腂腸膱臔臞 臁膇臇膉 臲臢 腁腂 腃腀腄腁 腉腏腈腍腊腆腌腐腂腋腎腇腅 ῏῏ 57 Bull. Earthq. Res. Inst. Univ. Tokyo Vol. pp. * e-mail : [email protected] : Earthquake Research Institute, the University of Tokyo The Special Project for Earthquake Disaster Mitigation in the Tokyo Metropolitan Area has been ongoing ( ). Under this project, the Metropolitan Seismic Observation network (MeSO-net), which consists of about observation sites, has been constructed. This network consists of five dense linearly arrayed stations and evenly spaced stations. This five liner arrays focus on observing highly active seismicity, many repeating earthquakes, slow slip area, and historical large earthquakes. The correlations of waveform from local and teleseismic events are high because observation points are deployed at about or -km intervals. In addition, identific- ation of any stations of the later phase is easy even if artificial noise is very intense. These widely developed stations have been used e ectively for the seismic tomography method. These dense intervals of MeSO-net will induce a more highly resolved structure than previous studies. MeSO-net has observed earthquakes of more than M .. Low-frequency waveforms of less than . Hz have been observed by MeSO-net. The distribution of amplitudes observed at each station show heterogeneous amplification of shaking motions. Our study will lead to improved quality of plate structure, and contribute to a new assessment of seismic hazards in the Tokyo Metropolitan Area, Japan. : MeSO-net, dense seismic observation, seismic sensitivity, heterogeneous amplification M . : M : M M * Shin’ichi Sakai* and Naoshi Hirata Abstract Key words Distribution of the Metropolitan Seismic Observation network 2. ,**3 /1 03 ++- **-, +++ ,**3 ,**3 ,**1 ,*+, .** , - # ,* *+ 2* ,**2 ,** .** 2* 1 - 1 1 +

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Page 1: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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57

Bull. Earthq. Res. Inst.

Univ. Tokyo

Vol. pp.

* e-mail : [email protected]

:

Earthquake Research Institute, the University of Tokyo

The Special Project for Earthquake Disaster Mitigation in the Tokyo Metropolitan Area has

been ongoing ( ). Under this project, the Metropolitan Seismic Observation network

(MeSO-net), which consists of about observation sites, has been constructed. This network

consists of five dense linearly arrayed stations and evenly spaced stations. This five liner arrays

focus on observing highly active seismicity, many repeating earthquakes, slow slip area, and

historical large earthquakes. The correlations of waveform from local and teleseismic events are

high because observation points are deployed at about or -km intervals. In addition, identific-

ation of any stations of the later phase is easy even if artificial noise is very intense. These widely

developed stations have been used e ectively for the seismic tomography method. These dense

intervals of MeSO-net will induce a more highly resolved structure than previous studies. MeSO-net

has observed earthquakes of more than M . . Low-frequency waveforms of less than . Hz have

been observed by MeSO-net. The distribution of amplitudes observed at each station show

heterogeneous amplification of shaking motions.

Our study will lead to improved quality of plate structure, and contribute to a new assessment

of seismic hazards in the Tokyo Metropolitan Area, Japan.

: MeSO-net, dense seismic observation, seismic sensitivity, heterogeneous amplification

M .

:

M :

M M

*

Shin’ichi Sakai* and Naoshi Hirata

Abstract

Key words

Distribution of the Metropolitan Seismic Observation

network

2. ,**3 /1 03

++- **-, + + +

,**3 ,**3

,**1 ,*+,

.**

, -

#

, * * +

2 * ,**2

,** .** 2*

1 -

1 1

+

Page 2: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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Table Fig.

km

MeSO-net M

km

Metropolitan Seismic Observation net-

work : MeSO-net km

km km

m

Fig.

km

km MeSO-net

SN

M

a

b

Table Fig.

km

.0 + +

, - ,**3

. 2*

.

1

,**1 ,*

/ 2*

/

2**

+***

.** +

,**1 / .**

+**

,**1 ,**3 ,**1

- ,,0 //

,-

,**, ,**1

-

,

1 -* 1*

,**. /

/

,**3

,**3 ,**2

+,1 , +

,**/

+3

- ,-

-

/

Page 3: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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59

Fig. . Distribution of seismic stations of MeSO-net.

Color indicates year station was established. Dots indicate stations under development.

Large square and small squares indicate area of estimated Northern Tokyo-Bay

Earthquake and stations still to be developed within it.

Nakajima and Hasegawa,

Igarashi,

Table , Fig. Kimura

Fig.

P S

km

km

MeSO-net

a

Matsubara

et al.,

et al.,

+

,**3

,**3 ,**3

.2 - + ,**0

,*+*

+1.

,

/

,

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/

+*

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Page 4: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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60

observed by the Tsukuba-Fujisawa line. Top is northern station and bottom is southern station.

Fig. . Distribution of earthquakes of more than M . are shown with MeSO-net.

Color indicates focal depth. Earthquakes were determined by MeSO-net ( . . . . ).

Fig. . Waveforms of earthquake (M . , depth km) occurring at northern Tokyo-bay on Oct.,

Fig.

MeSO-net

m

,**3

, , *

,**2 . + ,**3 3 -*

- , / -* +1

-

,*

Page 5: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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62

observed by the Tsukuba-Fujisawa line. Top is northern station and bottom is southern station.

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Page 7: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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63

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This earthquake (M . ) occurred at the Samoa Islands on Sep., .

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Page 9: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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Table . List of the seismic stations of the MeSO-net that started in .+ ,**1

Page 10: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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Table . List of the seismic stations of the MeSO-net that started in ., ,**2

Page 11: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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Table . (Continued),

Page 12: Distribution of the Metropolitan Seismic Observation network · 2021. 4. 8. · V 01–‚u˛™l4 f˛%QV U fi fl ŁHŒBŠ AZ+Ÿ˛x ... †1 ˙ u2˛‡+} …—–!8 ƒ #HW 62 observed

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Table . List of the seismic stations of the MeSO-net that started in .- ,**3

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dimensional P- and S-wave velocity structures beneath

the Japan Islands obtained by high-density seismic

stations by seismic tomography, ,

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ACT protocol

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Igarashi, T., , Seismic velocity discontinuities in the

crust and uppermost mantle beneath the Kanto district, P .

central Japan, identified from receiver function imag- b

ing and repeating earthquake activity,

, , . .

a Nakajima, J., F. Hirose, and A. Hasegawa, , Seismotec-

M tonics beneath the Tokyo Metropolitan area, Japan :

E ect of slab-slab contact and overlap on seismicity,

. , B , doi : . / JB .

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Repeating earthquake activities associated with the

Philippine Sea plate subduction in the Kanto district, No. .

central Japan : A new plate configuration revealed by

interplate aseismic slips, , , .

. (Received November , )

Matsubara, M., K. Obara, and K. Kasahara, , Three- (Accepted January , )

Tectonophysics,

Gondwana Re-search,

J.Geophys. Res.,

Tectonophysics,

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