Tsunami Warning System of SCS

Zhao LiandaNational Marine Environmental Forecasting Center (NMEFC), SOA

Tsunami warning system

State Council

Emergency departments

Local governments

Medias

1 、 Tsunami warning framework

CEA

Tide gauges

PTWC

Tsunami buoys

Earthquake

Water-level

• 2.1 tide gauge stations

• 2.2 tsunami buoys in SCS

2 、 Monitoring

2.1 、 Tidal Gauge Stations, SOA

State Oceanic Administration of China (SOA) has established a

tide gauge stations network to monitor sea

level change. The monitoring net work was composed coastal tide gauges and island tide

gauges.

Friday, April 21, 2023

December 26, 2006 年 ,occurred in the south of Taiwan Island

ChongWu tide gauge station recorded 7.8 cm tsunami wave after 3.4 hours of earthquake （ right-up map ） ; DongShan tide gauge station recorded 10 cm tsunami wave after 3.2 hours of earthquake （ right-middle map ） ;HongKong Observary recorded 10 cm tsunami wave （ right-below map ） 。

Two tsunami buoys will be purchased and deployed in SCS.

We will get real-time data from tsunami buoys in the latter half of the next year.

2.2 Tsunami monitor buoys

the locations of two tsunami buoys

3 Quantitative Tsunami Forecast System

∂qx∂ t

=−ghζ −ξ ∂ζ∂x

∂qy∂ t

=−ghζ −ξ ∂ζ∂y

∂ζ∂ t

=−∂qx∂x

−∂qy∂y

∂ξ∂t

(H

1

,h

1

)

(H,h)

Numerical modeling

量的津波データベース

量的津波データベースDatabase

Parameters input

Results

1010 minutesminutes

Epicenter determination

Thank you

Hypothesis tsunami earthquake epicenters

235 epicenters are determined in 10-32N ， 105-132E, covering the Ryukyu and Manila Trench

For each epicenter, 30 (5*6) tsunami cases:

Magnitude (Mw): 6.5, 7.0, 7.5, 8.0, 8.5

Focal depth (km): 0, 20, 40, 60, 80,100 Mass computing, all about 7050 （ 235*30 ） tsunami

events case. The results are loaded into database. The database will expand in future

Some computing files

Tsunami forecast system based on database and GISTsunami forecast system based on database and GIS

Tsunami forecast results display.Different color divide coastline. Each frame gives tsunami wave height and arrival time. Different color of frames represents different impact.

Tsunami forecast results display.Different color divide coastline. Each frame gives tsunami wave height and arrival time. Different color of frames represents different impact.