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71
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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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.
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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.
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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,
, .
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Inose, H., Y. Yasuda, and J. Marakami, , A Telemetering
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Received November ,
Accepted January ,:
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cm,
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IRE Trans.
J. Seism.,
Rev. Sci. Instrum.,
USGS Open File Report,Proc.IEEE,
on Space Electronics Telemetry, SET-
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