tsunami warning system
DESCRIPTION
tsunami warning system is a system which is used to detect tsunami and issue a warning which is used to prevent loss of life and property.TRANSCRIPT
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A
SEMINAR PRESENTATION
ON
“tsunami warning system”
2013-2014 SUBMITTED TO: SUBMITTED BY:
Mr. Amit Kumar Prajapati Vibhor Rathi
Mr. Rajveer Marwal 4th Year, 8th Sem.
Seminar Coordinators (Sec B) EC/10/148
DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING
POORNIMA COLLEGE OF ENGINEERING, JAIPUR
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CONTENTS Tsunami Tsunami Warning System Detecting Tsunami Seismometers Tidal Gauge DART Buoys Digiquartz Broadband Depth Sensor Acoustic Transducer Acoustic Link DART I & II System Advantages & Disadvantages Future Scope 2
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TSUNAMIIt is a series of wave with long wavelength and long wave
period.Apart from seismic activity, there are many other factors
responsible for Tsunami.These gigantic waves are probably one of the most
powerful and destructive forces of nature.
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TSUNAMI WARNING SYSTEMTWS is a system which detects tsunami and issue a
warning to prevent loss of life and property.This system consist of two main parts:
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TWS
Network of sensors
Communication Infrastructure
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WORKING OF TWSNetwork of seismic monitoring station at sea floor
detects presence of earthquake.Seismic monitoring station determines location and
depth of earthquake having potential to cause tsunami.Any resulting tsunami are verified by sea level
monitoring station such as DART buoys, tidal gauge.
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TYPES OF TWSThere are two distinct types of TWS:
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TWS
International Warning System
National Warning System
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INTERNATIONAL WARNING SYSTEM
This system uses both data like seismic and water level data from coastal buoys.
Tsunami travel at 500-1000 km/hr, while seismic wave travel at 14,400 km/hr.
This give sufficient time for tsunami forecast to be made.
It is commonly used in Pacific ocean and Indian ocean.
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NATIONAL WARNING SYSTEM
This system use seismic data about nearby recent earthquake.
This system is unable to predict which earthquake will produce significant tsunami.
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NWS
Tsunami Watches
Tsunami Warning
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TSUNAMI WATCHWatch is issued based on seismic information.Watch is issued without confirmation that destructive
tsunami is underway.Tsunami watch is issued to officials which may later
impact the watch area.
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TSUNAMI WARNINGTsunami warning is issued when potential tsunami is
expected.It alert officials to take action for entire tsunami hazard
zone.Warning is issued automatically if an earthquake
powerful enough to create tsunami occur nearby.
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DETECTION METHOD
GEOLOGICAL ACTIVITY
WAVE ACTIVITY
COASTLINE ACTIVITY
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PHASE 1 PHASE 2 PHASE 3
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DETECTING TSUNAMIThree types of technologies are used for detecting
tsunami:
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•SEISMOMETERS
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•COAST TIDAL GAUGES
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•DART BUOYS
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SEISMOMETERSInformation available about source of tsunami is based
on seismic information.Earthquake are measured based on its magnitude
recorded by its seismograph.
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DRAWBACK OF SEISMOMETERSData are indirect and interpretation is difficult.It involve poor understanding of seismic coupling.
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TIDAL GAUGEMeasure sea level near coastal area.Continuously monitors and confirms tsunami waves
following an earthquake.If tsunami occurred other than earthquake we depend
solely on data of tidal gauge.
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DRAWBACK OF TIDAL GAUGEMay not survive impact of tsunami.Cannot provide data that are especially important to
operational hazard assessment directly.
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DART BUOYSReport to tsunami warning centre, when tsunami occur.Information are processed to produce a new and more
refined estimate of tsunami source.Result is an accurate forecast of tsunami.
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ADVANTAGE OF DART BUOYSSeismometer do not measure tsunami.Tidal gauge do not provide direct measurement of deep
ocean tsunami energy propagating.DART overcomes drawback of both.
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WORKING OF DART BUOYSDART BUOY consist of two main component:• Bottom Pressure Recorder (BPR)• Surface Buoy
BPR consisting of a modem to transmit data to surface buoy.
Surface buoy transmit data to warning centre via satellite communication.
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BOTTOM PRESSURE RECORDER:Digiquartz Broadband depth Sensor is the main sensing
element.This sensor continuously monitors pressure and if
pressure exceeds threshold value, it automatically report to warning centre.
SURFACE BUOYS:Surface buoys makes satellite communication to
warning centers that evaluate the threat and issue a tsunami warning.
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21DIAGRAM OF DART BUOY
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DIGIQUARTZ BROADBAND DEPTH SENSOR
This depth sensor provide accurate & stable data.Superior performance of digiquartz instruments is
achieved through use of quartz crystal.Pressure transducer employs bellows tube as pressure to
load generators.Change in frequency of quartz crystal oscillator is a
measure of the applied pressure.
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ACOUSTIC TRANSDUCERA electrical device that converts sound wave into
electrical energy.Hydrophone is used in this case.When electrical plates are exposed to sound vibration
electrical energy is produced.Electrical energy is sent to amplifier and then to final
destination.
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ACOUSTIC LINKAcoustic communication is a technique of sending and
receiving signals under water.It is done by help of acoustic modem.Modem operates at frequency of 10Hz – 1MHz.It provides an accurate and efficient method to send and
receive data underwater.
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NOAA AND DART STATIONSNOAA(NATIONAL OCEANIC & ATMOSPHERIC ADMINISTRATION)
• Responsible for providing tsunami warning to the nation.
DART(DEEP OCEAN ASSESSMENT & REPORTING OF TSUNAMI)
• Station that detects tsunami.
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MODES OF OPERATIONDART buoy has two modes of operation:
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MODES
STANDARD MODE
EVENT MODE
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STANDARD MODE:System generally operates in standard mode.DART transmits data every six hours with recording
period of 15 minutes.
EVENT MODE:When tsunami wave occur standard mode trigger to
event mode.Transmit data every15 minutes at an average of 1 minute
for three hours.
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DIAGRAM SHOWING TSUNAMI WAVE GENERATION
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SERIES OF DART SYSTEMThere are two series of DART buoy system:
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SERIES
DART I BUOY
DART II BUOY
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DART I SYSTEMOne way communication ability.Relied solely on software’s ability to detect a tsunami
and trigger to event mode.To avoid false alarm, a threshold value is set such that
tsunami with low amplitude could fail to trigger the station.
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DART II SYSTEMIt is a two way communicationMeasure seal level change of less than a millimeter in
the deep ocean.Two way communication allows for trouble shooting of
the system.System can be switched to event mode by concerned
authority for research purpose.
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ADVANTAGESDeep water pressure produce low false reading.Multiple sensor can detect wave propagation.Good advance warning system.
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DISADVANTAGESExpensive equipments.High maintenance cost.Require multiple communication link:• SONAR.• Satellite Uplink.• Satellite Downlink.• Notification to authorities.• Authorities notifies coastal dwellers.
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FUTURE SCOPEUse of GPS to detect tsunami.Developed by NASA.GPS detects ground motion preceding tsunami.It estimate tsunami destructive potential within minutes.Estimates energy that undersea earthquake transfer to
ocean.With help of these data, ocean floor displacement
caused by earthquake can be inferred.
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REFERENCEShttp://en.wikipedia.org/wiki/Tsunami_warning_systemhttp://seminarprojects.net/t-tsunami-warning-systemhttp://www.authorstream.com/Presentation/
aSGuest132268-1389817-ppt-for-seminar-tsunami-alarmhttp://www.tsunamiterror.info/future_proposed.html
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QUERIES ? ? ?
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THANK YOU
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