click to edit master subtitle style japanese earthquake early warning system by nick labsvirs
TRANSCRIPT
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Japanese Earthquake
Early Warning System
By Nick Labsvirs
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EEW (Earthquake Early Warning)
•Measuring propagation P waves after an earthquake has already begun
•Alerting country to danger for emergency action
•Providing an estimated arrival time
•Signals emergency to automated systems
•Japan Meteorological Agency
•Around 500 million dollars to develop
•After Kobe earthquake, development 1995-2007
JMA
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Earthquake Detection Method•P-waves propagate from epicentre at faster speed then S-waves-P-waves around 7 km/s-S-waves around 4 km/s•Less destructive than periodic motion of S waves•Detected by network of seismometers•Seismometers perform estimations for-Epicentre location-Magnitude-How long till S-waves reach you
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Earthquake Detection Method•March 11th earthquake occurred at 14:46:23 (JST) near the east coast of Honshu•Depth 24.4 km•Detection and computation time around 8.6 seconds•In that time S-waves travel about 35km•Tokyo about 373km from epicentre•About 90 seconds for S-waves to travel there•So about 80 seconds warning for Tokyo
Map showing recorded JMA seismic intensities approx 10 hours after main event
Tokyo
90s
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How are warnings broadcasted?
•Television
•Radio
•Computer Pop ups
•Text messages
•Sirens
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Emergency ResponsePersonalAt Home- Protect your head and shelter under a table
When Driving- Turn on your hazard lights to alert otherdrivers, then slow down smoothly-Pull over
Outdoors- Look out for collapsingconcrete-block walls- Be careful of falling signsand broken glass
What will you do when the time comes??
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Emergency ResponseAutomated ResponsesTrains-ATS System installed in most trains
Elevators-Open elevator doors automatically
Hazardous situationsMedical-Stop surgery
Power/Water-Shut down reactor (If you have an operating cooling system!)-Turn off power-Turn off water pipes
Factories-Secure assembly line
Diagram explaining ATS system (operating in most bullet trains)
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Was it effective?•Considering the size of the earthquake, yes•Most devastating damage done by tsunami•Actual effectiveness not fully known yet, early days
Other Early Warning Systems •Mexico•Romania•Turkey•Taiwan
•System under development in California “California Integrated Seismic Network” based on Japanese system (USGS)
•Cost: $150 million (5 years)
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Thanks for listening!
Any Questions?