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Geohazard Supersites and Natural Laboratories
Report to DLRFalk Amelung, GEO task leader
September 2011
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Hawaii Supersite
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Halemaumau crater
Summit vent
Hawaii Supersite (1) : Kilauea crater rim instability
processed using 30 m DEM Richter & Poland, HVO Photos: HVO
TerraSAR-X interferogram
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Halemaumau crater
Summit vent
processed using 3 m DEM Richter & Poland, HVO Photos: HVO
TerraSAR-X interferogram
Hawaii Supersite (1) : Kilauea crater rim instability
![Page 5: Geohazard Supersites and Natural Laboratories Report to DLR Falk Amelung, GEO task leader September 2011](https://reader036.vdocuments.us/reader036/viewer/2022062802/56649e995503460f94b9ca18/html5/thumbnails/5.jpg)
Summit vent
processed using 3 m DEM Richter & Poland, HVO
TerraSAR-X interferogram
Hawaii Supersite (1) : Kilauea crater rim instability
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Growth with time
Richter & Poland, HVO
Hawaii Supersite (1) : Kilauea crater rim instability
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• We are looking for a 0.5 fringe signal near the coast in this image• Atmospheric artifacts dominate the signal in each interferogram• Will use time series methods to extract the signature
Interferograms courtesy Piyush Agram
From Howard Zebker, Stanford University
Hawaii Supersite (2) : Slow Slip Event at Kilauea
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Kilauea rift eruption March 2011
A propagating fissure (surface expression of a dike)
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Baker and Amelung, U of Miami
Hawaii Supersite (3) : Kilauea’s magma system
February 2011 intrusion Post-intrusion inflation
LOS velocity from SBAS time-series
Envisat TSX
ALOS
GPS
Intrusion causes step in time series!
Dis
plac
emen
t [cm
] GPS station inside caldera
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Mt. Etna Supersite
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Mt. Etna Supersite: TerraSAR-X
Descending Orbits
Time Interval:Sep 2008 – Dec 2009
27 acquisitions
76 Interferograms
Ground Resolution: ~ 30 meters
Look Angle: 42.9 deg
< -6 > 6cm/year
Mean deformation velocity
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ENVISAT90x90 m
TerraSAR-X30x30 m
ENVISAT vs. TerraSAR-X: Spatial Coverage
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TerraSAR-X vs. ENVISAT: Time Sampling
ENVISAT: 35 days
TerraSAR-X: 11 days
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Tohoku-oki earthquake Supersite
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E. Fielding, JPL
Tohoku-Oki earthquake event SupersitePixel tracking offset of M 6.6 aftershock of April 11
Colorscale 3 m 17 March, 19 April images
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Septentrional fault:• GPS: ~10 mm/yr slip rate• Last earthquake about 1230 A.D. (8 m displacement accumulated)
magnitude 7.5-8 overdue!
• seismic hazard very high in Dominican Republic!• pop. 10 million, 5 million tourists/yr• minimal seismic network (2 people)
•
USGS open file report
Hispaniola Supersite
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Objective: estimate seismic hazard in Santiago, D. R. (2 million pop.)
~5 mm/yr LOS velocity
Hispaniola Supersite
TerraSAR-X interferograms11 days 22 days
Coherence sufficient slip rate measurement possible with 2-3 years of data!Need acquisitions every 11-22 days !
Expected signal
Fattahi, Wdowinski, Amelung, U of Miami