Northwest Pacific Tsunami Advisory Center

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Northwest Pacific Tsunami Advisory Center

• Japan Meteorological Agency

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Northwest Pacific Tsunami Advisory Center
Countries in Northwest Pacific Ocean
JMA Headquarters
Japanese Seismic Network
Northwest Pacific Tsunami Advisory
Analysis of seismic data and estimation of
arrival time and height of tsunami generated by
earthquakes in the Northwest Pacific Area
- Origin Time - Hypocenter - Magnitude (gt6.5) -
Estimated arrival time and height of tsunami
Global Seismic Network
Through the Global Telecommunication System of
WMO, E-mail and/or Facsimile
Information Exchange - Magnitude - Hypocenter
- Tsunami Information
Pacific Tsunami Warning Center (PTWC)
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Northwest Pacific Tsunami Advisory
OBJECTIVE ? To offer useful information including
tsunami amplitude forecasts ? To cover the
marginal seas adjacent to Northwest Pacific
In conjunction with the tsunami bulletins from
PTWC As an advisory for the actions taken by
the recipient countries such as alerting the
people and announcing evacuation notices on
their own responsibility
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(No Transcript)
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Seismic Waveform Data Collection
for Northwest Pacific
Tsunami Advisory
Worldwide Network (Broadband Stations)
IRIS/USGS(accessing LISS servers) and
IRIS/IDA(accessing IRIS server) seismic data via
the Internet.
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Seismic waveforms from IRIS
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Determination of Hypocenter
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Quantitative Tsunami Forecast System of JMA
Hypoceneter Magnitude
Numerical Simulation
Database
Even a most-advanced computer needs much time to
simulate tsunami propagation!
Tsunami Amplitude Arrival Time
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Forecast Points in the South China Sea
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Means of dissemination

• Global Telecommunication System (GTS) of World
  Meteorological Organization (WMO)
• WEPA40 RJTD
• E-mail
• Facsimile

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Case Study 1- Pacific Wave 06 source -
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Background seismicity (Mgt6.5,dlt100km)
distribution of disastrous earthquakes in the past
Ref. Utsu (personal comm.) for 801-2001
PDE for 2002- (Mgt6.5, dlt100km)
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Simulation example 1(M8.5, depth10km, reverse
fault)
Tsunami travel time
Maximum wave amplitude
epicenter
(in hours)
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Pacific Wave 06 source
Tsunami Travel Time
Estimated Tsunami Amplitude
Amplitude (m)
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Pacific Wave 06
Elapsed Time
5 M.
10 M.
15 M.
20 M.
25 M.
30 M.
1 H.
EQ.
NWPTA 001
NWPTA 002
Detection of Earthquake
Determination of HYP. M
Information from PTWC
Tsunami Observation Ishigakijima Naha
ETA AMP.
HYP M
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Northwest Pacific Tsunami Advisory
CONTENTS 1 Earthquake Information 2
Evaluation of Tsunamigenic Potential 3
Estimated Amplitude and Arrival Time of Tsunami
4 Tsunami Observation Data
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Example of Northwest Pacific Tsunami Advisory
Earthquake Information
Potential of Tsunami
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Example of Northwest Pacific Tsunami Advisory
(continuation)
Estimated Tsunami Height
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Example of Northwest Pacific Tsunami Advisory
(continuation)
Tsunami Observation