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THE DISTRUCTION CAUSED BY THE EARTHQUAKE Satellite Communication Fiber optics network Pager services Covers large country like India Easily available Primary Waves •Are first to be radiated •Speed of 8 km/sec •Compress ional in nature Secondary Waves •Radiated after primary waves •Speed of 3.5 km/sec •Sine wave in nature Earthquake sensors (accelerometers) Interface unit Decision system Alert dissemination system Accelerometer #1 Interface Accelerometer #2 Mobile Hand set The hand set •Should have auto dialing facility •Should be pre loaded with fixed number and a fixed message Application Server SMS Server Transmitters Receivers Earthquake strikes a Anjar Bhachau t0 30 Km from Anjar Average time to reach Bhachau Time for signal to reach So time at hand Damage time fro a poorly constructed house So total time at hand 30/3.5 = 8.6 sec 2 sec 6.6 sec 5 - 7 sec 11.6 – 13.6 sec So hence we have much time to respond. Alert messages transport to a destination hand set in SMS mode The receivers have the interface unit to read the message Receivers are attached to civil defense siren and broadcast system Deployed at known epicenter Does not find the epicenter Discrete magnitude level detected Magnitude above threshold level is transferred False alarm rate -- 85% Complex interfaces Only one accelerometer Higher vulnerability Two accelerometers •High synchronization •Low vulnerability Transmitter 3-5 mtrs Accelerometer # 1 Accelerometer # 2 Speed of 40 msgs/sec Easy, Efficient to use 1 sec 2 sec 3 sec 40 40+(40*40) 40+(40*40)+(40*40*40) Time delay because of :1.Sensor response time 2.Circuit delay 3.Signal processing Further Readings Name Distance Alert –time Morvi 60 kms 12-14 sec Rajkot 110 kms 27-30 sec Viramgham 160 kms 41-43 sec Ahemdabad 220 kms 62-64 sec Vadodara 300 kms 72-74 sec