Click to edit Master subtitle style Japanese Earthquake Early Warning System By Nick Labsvirs.

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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?