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Vol. pp. 2. ,**3 1+ 22 MeSO-net Development of the ...Metropolitan Seismic Observation network...

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Page 1: Vol. pp. 2. ,**3 1+ 22 MeSO-net Development of the ...Metropolitan Seismic Observation network (MeSO-net). Deployment of MeSO-net seismic stations is currently underway. The number

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Bull. Earthq. Res. Inst.

Univ. Tokyo

Vol. pp.

* e-mail : [email protected]

Earthquake Research Institute, the University of Tokyo

National Research Institute for Earth Science and Disaster Prevention

To better assess the seismic hazards produced by a magnitude or greater ( ) earthquake

in the Tokyo metropolitan area, we have launched the Special Project for Earthquake Disaster Miti-

gation in Tokyo Metropolitan area ( ). This requires establishing a highly dense seismic-

array observation network in and around Tokyo to monitor ongoing micro-earthquakes with rela-

tively high precision even if noise levels are generally high. We have started developing the

Metropolitan Seismic Observation network (MeSO-net). Deployment of MeSO-net seismic stations

is currently underway. The number of observatories at project termination will be with a

km interval in space. In this paper, we summarize how we solved technically di cult and practical

problems involved in MeSO-net construction. We start with a review of related work to better

understand the technical di culties involved in deploying stations in metropolitan areas such as

Tokyo. Next, we explain our approach to verifying a meaningful design of an observatory and its

deployment at local sites. We further describe our decision-making process in practice for imple-

menting station deployment. We hope that establishing the MeSO-net will support a new assess-

ment of the seismic hazards produced by earthquakes in the Tokyo metropolitan area.

: Seismic instruments and networks, Seismic and tectonics, Subduction zones, Earth-

quake source observation, Tomography, Earthquake ground motion and engineering

seismology

M

M

*

Keiji Kasahara *, Shin’ichi Sakai , Yuichi Morita , Naoshi Hirata , Hiroshi Tsuruoka ,

Shigeki Nakagawa , Kazuyoshi Z. Nanjo and Kazushige Obara

M

M

Abstract

Key words

network (MeSO-net) for Detection of Mega-thrust beneath

MeSO-net

Development of the Metropolitan Seismic Observation

Tokyo Metropolitan Area

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Page 2: Vol. pp. 2. ,**3 1+ 22 MeSO-net Development of the ...Metropolitan Seismic Observation network (MeSO-net). Deployment of MeSO-net seismic stations is currently underway. The number

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st nd rd th

mum amplitudes for the seismograms. Amplitudes in each

digital recordings made at the observatory in Earthquake

respectively. The numbers inside the figure are the maxi-

seismograph are normalized by the maximum amplitude

Fig. . Seismographs on and around the P-wave arrival

of the earthquake with magnitude . at : March

in southeastern Ibaraki prefecture. The traces are

Research Institute, at an epicentral distance of about

km. The seismograms were made at depths of , , ,

and m in the , , , and traces from the top,

for visualization purpose.

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Fig. . Same as Fig. for an earthquake of magnitude .

on : March in southeastern Ibaraki prefec-

ture. The epicentral distance from the observatory in

Earthquake Research Institute is about km.

Fig. . Power spectral density of ground motion noise (UD component) at Earthquake

Research Institute for di erent depths : , , , and m. Left panel : records under

clear sky at night ; right panel : records in heavy weather during daytime.

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Fig. . Schematic diagram of an observatory with structural drawing. Top left panel ( ) : overall structure ;

top right panel ( ) : well structure ; and bottom left panel ( ) : case structure.

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Fig. . Sensor part. First, second, and third panels from the top are conceptual drawings

of the sensor, photo of component, and photo of internal component, respectively.

Hole Lock

Hole Lock

Obara Hi-net

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Fig. . Photos of fixing apparatus that utilizes the Hole lock. This apparatus

is located at the top and bottom of the protective housing of a seismometer.

Left panel : view of the inside ; right panel : external view.

Fig. . Schematic diagram showing how to install a

seismometer. See text.

Hole Lock

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amplitude observation for an earthquake of magnitude . ( : November ) under the MeSO-net.

These observations were made at the Tsukuba observatory located in the area of the National Research

Institute for Earth Science and Disaster Prevention (NIED), at an epicentral distance of about km.

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88

System by Code Modulation : Modulation,

Obara, K., K. Kasahara, S. Hori and Y. Okada, , A densely

Koketsu, K. and H. Miyake, , A seismological overview

of long-period ground motion, , .

ACROSS

P .

Lee, W.H.K., H. Kanamori, P. Jennings, and C. Kisslinger

(Editors), , International Handbook of Earthquake

& Engineering Seismology (International Geophysics

Series) Part A, Academic Press, pp.

MeSO-net

MeSO-net

ACT protocol

.

.

.Bolt, B.A., , Nuclear Explosions and Earthquakes : The

Parted Veil, W.H. Freeman, pp.

distributed high-sensitivity seismograph network in

Japan : Hi-net by National Research Institute for Earth

Science and Disaster Prevention, ,

, doi : . / . .

Peterson, J., , Observations and modeling of seismicForbes, C.B., R. Obenchain and R. J. Swain, , The LASA

back-ground noise, ,sensing system design, installation, and operation,

, .

.

K-NET :

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Hi-net KiK-

net.

.

.

MeSO-net

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Inose, H., Y. Yasuda, and J. Marakami, , A Telemetering

., .

P ..

Received November ,

Accepted January ,:

.

cm,

cm

IRE Trans.

J. Seism.,

Rev. Sci. Instrum.,

USGS Open File Report,Proc.IEEE,

on Space Electronics Telemetry, SET-

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