GPS

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Continuous Earthquake Monitoring with Global
Positioning System (GPS)
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How does GPS work?
X,Y,Z,T
Absolute positioning
10 m
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Geodetic GPS
Thousands of kilometers apart
2-20 mm
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GPS for Earthquake Monitoring
Seismologists can measure the earthquake in terms
of amount of shaking, which directly relates to
the energy released in the earthquake. However,
they can not measure the site or fault
displacements.
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GPS for Earthquake Monitoring

• GPS can measure the size of the earthquake by
• examining the displacements of pre-determined
• points.
• GPS is also a magnificent tool for obtaining the
  
• strain accumulation along the fault and
  tectonic
• strain rates, which may indicate earthquake
• potential.

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GPS for Earthquake Monitoring
GPS can be used for real-time site
displacements. Seismologists can measure the
magnitudes of aftershocks and pre-shocks.
However, these magnitudes can not help us on any
prediction. GPS can show us whether or not the
fault or any pre-determined site has moved due to
the shocks.
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Continuous Earthquake Monitoring with GPS
MONITORING SITE
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Southern California Integrated GPS Network (250
GPS sites)
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Continuous GPS recording in the San Francisco Bay
Area
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GPS Earth Observation Network System (GEONET),
Japan 1000 GPS sites (proposed 2000) 24 hours
download 3 hours process
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How about in Marmara ?
Continuous GPS Monitoring Project funded by
the World Bank participants
TUBITAK, ITU, BU, GCM, MIT started in
1997 15 proposed GPS sites
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How about in Marmara ?