Manabu Hashimoto and Yo Fukushima, (DPRI, Kyoto University) - - PowerPoint PPT Presentation

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Sep 30, 2023 115 likes •327 views

Manabu Hashimoto and Yo Fukushima, (DPRI, Kyoto University) Acknowledgments PALSAR level 1.0 data are shared among PIXEL (coordinator: Dr. Taku Ozawa), Earthquake WG (Geographical Survey Inst.) and provided from JAXA under cooperative research

SLIDE 1

Manabu Hashimoto and Yo Fukushima, (DPRI, Kyoto University)

SLIDE 2

Acknowledgments

PALSAR level 1.0 data are shared among

PIXEL (coordinator: Dr. Taku Ozawa), Earthquake WG (Geographical Survey Inst.) and provided from JAXA under cooperative research contract with ERI,

Univ. Tokyo.

The ownership of PALSAR data belongs to

METI (Ministry of Economy, Trade and Industry) and JAXA.

SLIDE 3

Motivation

Examples of InSAR time series anayses

Ground subsidence Creep along active faults Volcanic deformation

Frontier

Secular deformation in subduction zones

One example with ERS←low spatial density Long wave‐length ～ orbital error Small deformation

SLIDE 4

InSAR Analyses of ALOS/PALSAR Data in Kii Peninsula and Shikoku

Large deformation due to the subduction of

the PHL plate

Strike of island arc perpendicular to path of

ALOS

Gradient of deformation is parallel to the path

InSAR and stacking of data from May, 2006

to July, 2008

SLIDE 5

Synthetic Interferogram from GEONET Velocities (Ascending Path)

SLIDE 6

Synthetic Interferogram from GEONET Velocities (Descending Path)

SLIDE 7

Shikoku Area (Path 417)

19 acquisitions during 2006~2008

Pt. Muroto ~ Okayama

SLIDE 8

1 2 3,4 5 6 7 8 9 10 11 12~4 15 16~8 19 20 21 22 23 24 25

SLIDE 9

Selected Interferograms w.r.t. 2008/07/18

No Coherence in Mountains

SLIDE 10

Fringes proportional to topography Orbit Error/ Ionosphere? 1 2 3 4 5 6 7 8 9 10 11 12

SLIDE 11

Gravity wave? Orbit Error/ Ionospheere? 13 14 15 16 17 18 19 20 21 22 23 24

SLIDE 12

Unwrapped Interferograms

Branch‐cut Deformation profile using grdtrack in GMT

SLIDE 13

Processed with Branch‐cut Red line indicates the sampling line . ③ ④ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬

SLIDE 14

SLIDE 15

SLIDE 16

SLIDE 17

Stacked Interferogram s

With Stacking

in Gamma

Stacking of 15

interferograms

More than 5

bs. at each

pixel

Larger than

GPS

SLIDE 18

SAR Acquisition: Path 414

SLIDE 19

Interferograms along path 414

SLIDE 20

Summary

Bperp < 500m is necessary

<300m is good for mountains >300m causes unwrapping problems Fraction of residue < 1% for smooth unwrapping >500m is no use in mountains

Disturbances in interferograms with small Bperp

Bad orbits or large ionospheric effect on 2006/08/28

and 2009/07/21 acquistion

Short spatial baseline with long temporal

baseline

Spatial pattern of stacked interferogram

Fair(?) agreement with GPS A bit larger than GPS