Crust Deformations With Volcanic Activities Derived From an Airborne SAR
Seiho Uratsuka, Toshihiko Umehara, Hideo Maeno, Makoto Satake, Akitsugu Nadai and Harunobu Masuko
Communications Research Laboratory, Japan.
Contacts: pata@crl.go.jp (Seiho Uratsuka)
Abstract
A dual-frequency (X- and L-band) airborne SAR (Pi-SAR) which has been developed by CRL and NASDA observed these two volcanoes, Usu and Miyake in 2000. The radar has full-polarimetric function for both frequency bands and has cross-track interferometric function for X-band. The resolution of the radar system is bout 1.5 m for X-band and 3m for L-band. The new lavas of the Usu volcano were recognized very clearly through the bad weather and smoke. The change of the lavas and faults were also observed clearly by repeated observations. Simple analysis of the polarimetry reveals the extension of the area covered by pozzuolana and mud. Detail image comparison between different observation dates derives the crust deformation around the lavas. This result is consistent to the comparison of digital elevation models produced by single-pass interferometry. The extension of the large caldera of Miyake-jima was measured by the radar data. The size and depth were calculated by the image. The vertical cross-sections of the whole island derived from the interferometry can be compared.
raeg2003@tansa.kumst.kyoto-u.ac.jp
Last modified: Fri Dec 06 15:06:20 2002