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Tsunami Early Warning System SRI LANKA. Lalith Chandrapala Sarath Weerawarnakula. Early Warning System in Sri Lanka. No Early Warning System for Tsunami prior to 26-12 Different Government Institutions mandated to monitor and issue Early Warnings in the case of different hazards

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tsunami early warning system sri lanka

Tsunami Early Warning SystemSRI LANKA

Lalith Chandrapala

Sarath Weerawarnakula

early warning system in sri lanka
Early Warning Systemin Sri Lanka
  • No Early Warning System for Tsunami prior to 26-12
  • Different Government Institutions mandated to monitor and issue Early Warnings in the case of different hazards

(e.g. Meteorology for weather related, NARA for Oceanic, GSMB for seismological, NBRO for landslides etc.)

  • After 26-12, Department of Meteorology was designated as the Tsunami Early Warning Centre for Sri Lanka.
early warning system in sri lanka3
Early Warning System in Sri Lanka
  • A Technical Committee representing all stakeholders appointed to coordinate the activities of the EW Centre.
  • Connected with Pacific Tsunami Warning Centre and Japan Meteorological Agency thro’ telephone/fax
  • Technical Committee will become the ‘TAC on Early Warning of DMC’ once an EWC is established at the Disaster Management Centre (DMC).
early warning system in sri lanka4
Early Warning System in Sri Lanka
  • Seismic Information is received from
    • California Integrated Seismic Network (supplied from IOC)
    • Pallekele GSMB Seismic Station (from the display at GSMB HQ)
    • Pacific Tsunami Warning Centre - Advisories
    • Japan Meteorological Administration - Advisories
slide5

Early Warning System in Sri Lanka

Usually the EWC receives information about seismic events in the following order

* through Advisories

early warning system in sri lanka6
Early Warning System in Sri Lanka

Three Tide Gauges at

Colombo

Kirinda and

Trincomalee

(Maintained by NARA)

Information on sea level changes available to EWC only through the Internet.

Hawaii Sea Level Centre Web site

NARA website

slide7

Early Warning Systemin Sri Lanka

  • Warnings/Advisories on Tsunami are issued based on seismic data.
  • However, Sea Level Information from Indonesian gauges, particularly the gauge at Sibolga, is used for guidance in addition to the guidance provided by PTWC and JMA.
  • Advisory is issued within 30 minutes of the Earthquake
slide9

Once a Bulletin is issued ……

Dissemination to relevant authorities/institutions and communities

  • Media (Radio and Television)
  • [most effective and efficient!]
  • 2. through Regional Police Stations
  • 3. Military Communication Systems

through

slide10

15 minutes

Early Warning Centre

  • Seismic Info
  • GSMB Info
  • CISN
  • PTWC
  • JMA

Earthquake

If people receive the warning

in 45 minutes,

then they have over

one hour to respond

Sea Level Info

Issue of Advisory in 30 mnts.

Media – direct to communities

Police (Police HQ to Regional Police Stations and then to communities)

Military communication system to communities

educating public is very important
Educating Public is very important !

Over 93.5 % of the vulnerable coastal population in Sri Lanka have not even heard about ‘tsunami’

prior to last episode. (ADPC, 2005)

However, the present situation is different!

  • A large number of seminars/workshops/meetings have been conducted in vulnerable areas
slide12

Educating Public is very important !

Over 93.5 % of the vulnerable coastal population in Sri Lanka have not even heard about ‘tsunami’

prior to last episode. (ADPC, 2005)

However, the present situation is different!

A good example

On 28th March 2005

Magnitude 8.7

Within 55 minutes of the issuance of the Advisory Bulletin, all people evacuated.

slide13

Evacuation on 28th March 2005

was not

one hundred percent ideal

BUT

evacuation was completed

within

55 minutes

Kalmunai, Eastern Sri Lanka on 28th March 2005

slide14

Timeline – 28th March 2006

28/2210 hrs SLST Earthquake in Indonesia

28/2220 hrs SLST PALK station pickup unusual wave pattern

28/2230 hrs SLST PTWC Bulletin Number 1 received at EWC

28/2255 hrs SLST Tsunami Advisory issued – Evacuation begins

28/2350 hrs SLST Evacuation completed, Tide Watchers deployed by SLN

29/0300 hrs SLST All Clear issued by EWC

Time to issue advisory - 45 mints

Time between issue of advisory and evacuation completion - 1 hr 40 mnts

Time between start and end of evacuation – 55 mnts