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Geohazard Supersites and Natural Laboratories. Report to DLR Falk Amelung, GEO task leader September 2011. Hawaii Supersite. Hawaii Supersite (1) : Kilauea crater rim instability. Halemaumau crater. TerraSAR -X interferogram. Summit vent. p rocessed using 30 m DEM.

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Presentation Transcript
slide1

Geohazard Supersites and

Natural Laboratories

Report to DLR

Falk Amelung, GEO task leader

September 2011

slide3

Hawaii Supersite (1) : Kilauea crater rim instability

Halemaumau crater

TerraSAR-X interferogram

Summit vent

processed using 30 m DEM

Richter & Poland, HVO

Photos: HVO

slide4

Hawaii Supersite (1) : Kilauea crater rim instability

Halemaumau crater

TerraSAR-X interferogram

Summit vent

processed using 3 m DEM

Richter & Poland, HVO

Photos: HVO

slide5

Hawaii Supersite (1) : Kilauea crater rim instability

TerraSAR-X interferogram

Summit vent

processed using 3 m DEM

Richter & Poland, HVO

slide6

Hawaii Supersite (1) : Kilauea crater rim instability

Growth with time

Richter & Poland, HVO

slide7

Hawaii Supersite (2) : Slow Slip Event at Kilauea

  • 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 PiyushAgram

From Howard Zebker, Stanford University

slide8

Kilauea rift eruption March 2011

A propagating fissure (surface expression of a dike)

slide9

Hawaii Supersite (3) : Kilauea’s magma system

LOS velocity from SBAS time-series

February 2011 intrusion

Post-intrusion inflation

GPS station inside caldera

Envisat

TSX

Intrusion causes step

in time series!

Displacement [cm]

ALOS

GPS

Baker and Amelung, U of Miami

slide11

Mean deformation velocity

< -6

> 6

cm/year

Mt. Etna Supersite: TerraSAR-X

Descending OrbitsTime Interval:Sep 2008 – Dec 200927 acquisitions76 InterferogramsGround Resolution: ~ 30 metersLook Angle: 42.9 deg

slide12

TerraSAR-X

30x30 m

ENVISAT vs. TerraSAR-X: Spatial Coverage

ENVISAT

90x90 m

slide13

TerraSAR-X: 11 days

ENVISAT: 35 days

TerraSAR-X vs. ENVISAT: Time Sampling

slide15

Tohoku-Oki earthquake event Supersite

Pixel tracking offset of M 6.6 aftershock of April 11

Colorscale 3 m

17 March, 19 April images

E. Fielding, JPL

slide16

Hispaniola Supersite

USGS open file report

  • 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)
slide17

Hispaniola Supersite

Objective: estimate seismic hazard in Santiago, D. R. (2 million pop.)

TerraSAR-X interferograms

Expected signal

11 days

22 days

~5 mm/yr LOS velocity

Coherence sufficient  slip rate measurement possible with 2-3 years of data!

Need acquisitions every 11-22 days !

Fattahi, Wdowinski, Amelung, U of Miami