Constructing an Earthquake Seismometer and Early Warning System. Vardo Barsegyan , Sylvia Dhimdis , Matthew Ferrer , Dragos Guta , Jaesoon Lee, Arnold Martinez, Kenneth Moreno, Annie Norm, Lorenzo Rulli , Bryan Sanchez. Presentation Overview. Motivation Background: Seismology - PowerPoint PPT Presentation
BUILDING THE SENSOR
Constructing an Earthquake Seismometer and Early Warning
SystemVardo Barsegyan, Sylvia Dhimdis, Matthew Ferrer, Dragos Guta,
Jaesoon Lee, Arnold Martinez, Kenneth Moreno, Annie Norm, Lorenzo
Rulli, Bryan Sanchez
Presentation OverviewMotivationBackground: SeismologyDesign and
Construction of the Seismometer Warning
SystemDemonstrationSummaryJune 22, 2012SITE 2012 -
Seismometer2Earthquakes500,000 deaths in past 5
yearsInjuriesHomeless familiesJapan 9.0: Over $300 Billion
June 22, 2012SITE 2012 - Seismometer3
We can not predict earthquakes.But we can give early warning . .
.
June 22, 2012SITE 2012 - Seismometer4What is an Earthquake?
June 22, 2012SITE 2012 - Seismometer5Copyright 1999 John Wiley
and Sons Inc. All rights reserved.5
Body Waves
June 22, 2012SITE 2012 - Seismometer6CSUN6Propagation of Seismic
Waves
June 22, 2012SITE 2012 - Seismometer7IRIS.7Seismogram
June 22, 2012SITE 2012 - Seismometer8Minimum Warning Time
How Can We Detect These Earthquakes?
June 22, 2012SITE 2012 - Seismometer9Wadia Institute of
Himalayan Geology9
Principles AppliedNewtons Second LawHugyens LawFaradays LawOhms
LawDamping/ResistanceAmplificationDigitization
F=maJune 22, 2012SITE 2012 - Seismometer10
Field TripCal Tech Seismology LabMedia CenterSan Andreas
Fault
June 22, 2012SITE 2012 - Seismometer11
System Overview
June 22, 2012SITE 2012 - Seismometer12Building the Sensor
June 22, 2012SITE 2012 - Seismometer13Old Seismograph
http://slohs.slcusd.org/pages/teachers/rhamley/Plate%20Tectonics/seismograph.htmlJune
22, 2012SITE 2012 - Seismometer14Called seismograph, not a
seismometer14Building the SensorWorks as the mass of the
pendulumChoosing the number of turns of the coil More turns equals
more voltage but harder to damp
June 22, 2012SITE 2012 - Seismometer15Building the SensorWorks
as the paper of the sensor
June 22, 2012SITE 2012 - Seismometer16
Building the SensorFrequencies of P and S waves: 0.8 to 4 HertzT
= 1/f Length of the pendulum
TTH
June 22, 2012SITE 2012 - Seismometer17Building the SensorJune
22, 2012SITE 2012 - Seismometer18
PendulumSensor CoilMagnet-switch with a photo of the built
seismometer18Amplifier
Voltage from background motion is ~.5VNeed at least 10 mV to
display clearlyVoltage(out)=Gain*Voltage(in) Gain 20,000
LabVIEW
June 22, 2012SITE 2012 - Seismometer20LabVIEW
June 22, 2012SITE 2012 - Seismometer21DemoNSTRATIONJune 22,
2012SITE 2012 - Seismometer22ProblemsFalse alarms from human
movement in labLearning lab view difficultNeed faster Computers
June 22, 2012SITE 2012 - Seismometer23
Accomplishments/SummaryDesigned and built two seismometers
capable of detecting ground motion down to 0.5m per secondDesigned
and built one node of a complete earthquake alert systemProgrammed
seismometer data recording and retrieval systemReviewed the
concepts from math, physics, geology, computer science and
engineering needed for the project
June 22, 2012SITE 2012 - Seismometer24Questions?June 22,
2012SITE 2012 - Seismometer25
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