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3‐D surface deformation of the 2000 Usu Eruption measured by matching of SAR images
Author(s) -
Tobita Mikio,
Murakami Makoto,
Nakagawa Hiroyuki,
Yarai Hiroshi,
Fujiwara Satoshi,
Rosen Paul A.
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl013329
Subject(s) - geodesy , geology , subpixel rendering , interferometric synthetic aperture radar , synthetic aperture radar , offset (computer science) , displacement (psychology) , volume (thermodynamics) , deformation (meteorology) , remote sensing , seismology , computer science , pixel , artificial intelligence , physics , quantum mechanics , psychotherapist , programming language , psychology , oceanography
A subpixel level offset estimation technique was applied to SAR (Synthetic Aperture Radar) images of Usu volcano, Japan. Using RADARSAT SAR amplitude images acquired from ascending and descending orbits, we generated a map of three‐dimensional displacement vectors showing ground deformation associated with criptdome formation in April, 2000. Moreover, displacement velocities and volume changes were estimated. From April 3–29, inflation was observed with vertical and horizontal displacements each exceeding 20m. During the period of major activity from April 3–5, uplift and N‐S spreading velocities reached 3.3m/day and 2.7m/day, respectively, while volume change was + 3.4 × 10 6 m³/day. Although this technique is less precise than other methods and is not very sensitive to local deformations, it provides several key advantages including (1) personnel are not required to enter hazardous areas, (2) it provides wide spatial coverage, and (3) it does not depend on coherence, making it more widely applicable than InSAR.