geologic hazards & space geodesy
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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geologic hazards & space geodesy
part 1: Introduction
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thanks
• Ken Hudnut, USGS
• Roger Bilham, University of Colorado
• USAID, ADPC, USGS
• Thai National Disaster Warning Center
• Chulalongkorn University
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Geodesy
measuring the shape of the earth…
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and measuring changes
QuickTime™ and aMPEG-4 Video decompressor
are needed to see this picture.
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Many applications
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From planetary physics
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to Earth structure
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to surface monitoring
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What changes in the shape of the earth are associated with tsunamis?
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What causes tsunamis?
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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
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Before events
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Indian Ocean Sumatra
WEST EAST
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, itgets caught for hundreds of years and then the stored stressis released in a big earthquake.
Before events
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Before events
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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
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During events
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During events
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During events
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During events
Courtesy of Space Imaging and USGS CRSSP
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So how can GPS help?
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So how can GPS help?
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So how can GPS help?
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So how can GPS help?
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So how can GPS help?
O. Konca,Caltech