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