System and Data Research Co., Ltd.

Yutaka NAKAMURA, Dr. Eng.
System and Data Research, Co., Ltd.

Performance of an Early Warning System,
Compact UrEDAS,
during Destructive Shaking

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Concept of Earthquake Early Warning

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Practice of Earthquake Early Warning

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FREQL is toward to the new field, asfor the Hyper Rescue Team in the risk of aftershocks

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Gained Margin Time by Early Warningrm

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FrontAlaOAteiSn-byL
FREQ
byN.
CmlarJM
AbyL
EQ
RFf.
.In

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Amount of procedure is not differ from either
earthquake occurs or not, so it expected not to beoccurred the system down due to the over load.

It is characterized to be able to process digitizedwaveform step by step without storing thewaveform.

UrEDAS, Urgent Earthquake Detection and Alarm
System, is the only real time P-wave alarm systemover the world in practical use.

Introduction of UrEDAS

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UrEDAS and Compact UrEDAS can issue the alarm for the radius
range of 200 km and 20 km, respectively.

On the other hand, Compact UrEDAS can evaluate whether theearthquake will be destructive or not using Destructive Intensity DI andissues alarm one second after P-wave detection if needed.

Function of the UrEDAS is to estimate magnitude and location ofdetected earthquake in three seconds after initial P-wave detection andissuing the alarm for expected alarm area.

There are two types of UrEDAS at present; “UrEDAS” and “CompactUrEDAS”.

Functions of the UrEDASEEW2005, Caltech

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TimingTiming ofof thethe Alarms
Alarms

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Concept of the Front Alarmby Dr.Cooper, 1868

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The
Coast-line
Detection
SystemThe Coast-line Detection Systemforfor thethe Tohoku
Tohoku Shinkansen
Shinkansen since
since 1982
1982

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Video Photos at
the 1995 Kobe Earthquake
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Assessment Index for
Vulnerability of Strong Motion

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DI = log|av|, DI-value = max(DI)Destructive Intensity DI,

・Destructiveness of Motion relates power PW = Fv = mav

・Seismic Motion Energy E = mv2/2, “v” is seismic velocity

・Seismic Inertia Force F = ma, “a” is seismic acceleration

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The Change of DI for Earthquake Motion

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A Relationship between
PI-value, DI-value and Maximum Acceleration

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Alarms of Compact UrEDAS based on
Destructive Intensity and Acceleration Level

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Compact-UrEDAS can alarm
immediately at almost one second
after the P-wave detection basedon the destructiveness of thedetected earthquake, and also
alarm with S-wave. CompactUrEDAS for Shinkansen lines ofEast Japan Railways with 56
seismometers started operation
after adjustment for P wave alarm,
this system started full operation in1998 as along-the-railroad (onsite)
P wave detection system.
For the subway network in Tokyo
metropolitan area, six CompactUrEDAS seismometers started
operation in 2001 as the on-site Pwave alarm system.

Compact UrEDAS

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●The 2004 Niigataken Chuetsu Earthquake, M6.8,
2004/10/23,
Derailment of Shinkansen train and Damage forviaducts and tunnels of Joetsu Shinkansen line

●The 2003 Muyagiken-Oki Earthquake, M7.0,
2003/05/26,
Damage for viaducts of Tohoku Shinkansen line

Working Examples against
Recent Damage Earthquakes

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The 2003 Miyagiken-OkiEarthquake, M7.1, h70km

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Compact UrEDAS Alarm before EEW2005, Caltech
Destructive Strong Motion Arrivals

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www.sdr.co.jpLocations of Shinkansen Trainsat the 2003 Miyagiken-Oki Earthquake

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M6.8
h=13kmThe 2004
NiigatakenChuetsu
Earthquake

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Shinkansen Trains near the Epicentral Area

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Examples of Strong Motion Records

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Schematic Illustration ofthe 2004 Niigataken-Chuetsu Earthquake

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Compact UrEDAS Simulation using Strong Motion Records

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Response of the Compact UrEDAS against
The 2004 Niigataken-Chuetsu Earthquake

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Derailment of Toki #325

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Deformation caused by Static Horizontal Acceleration 0.25g

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Estimated Mechanism of Derailment

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Full AutomatedQuick and Reliable
Small and Cheap
Independence
Easy to Network
Accurate is Better

Necessity for Early Warning Systems

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FREQL and AcCoSystem and Data Research Co., Ltd.

Please visit my demonstration!

All in One Five inches Cube!!

Hyper UrEDAS

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Thank you for your kindattention!

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