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geologic hazards & space geodesy. part 1: Introduction. thanks. Ken Hudnut, USGS Roger Bilham, University of Colorado USAID, ADPC, USGS Thai National Disaster Warning Center Chulalongkorn University. Geodesy. measuring the shape of the earth…. and measuring changes. Many applications.

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Presentation Transcript
thanks
thanks
  • Ken Hudnut, USGS
  • Roger Bilham, University of Colorado
  • USAID, ADPC, USGS
  • Thai National Disaster Warning Center
  • Chulalongkorn University
geodesy
Geodesy

measuring the shape of the earth…

what causes tsunamis1
What causes tsunamis?
  • Fault slip caused the sea floor to deform (4-5 meters up, and 10-11 meters to the west)
  • This pushed the water and formed the tsunami
  • Model by Dr. Chen Ji at Caltech, funded by USGS external research program
before events1

WEST

EAST

Indian Ocean

Sumatra

Before events

Where the India plate is pushed down beneath the Banda micro-plate, it is being SUBDUCTED.

Where the two plates’ surfaces are sliding past each other, it

gets caught for hundreds of years and then the stored stress

is released in a big earthquake.

before events3
Before events
  • Temporal variations do occur:
    • Clustering (e.g., Basin & Range, ECSZ, Asia)
    • Discrepant geological and geodetic rates
    • Sequences involving fault interaction (e.g., Joshua Tree - Landers - Big Bear - Hector Mine; Anatolian system, etc.)
  • Implement robust research findings into hazard assessment

Courtesy Anke Friedrich

during events3
During events

Courtesy of Space Imaging and USGS CRSSP

so how can gps help4
So how can GPS help?

O. Konca,

Caltech