Japan Geoscience Union Meeting 2018

Presentation information

[EJ] Evening Poster

S (Solid Earth Sciences) » S-TT Technology & Techniques

[S-TT48] Synthetic Aperture Radar

Mon. May 21, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Yu Morishita(Geospatial Information Authority of Japan), Shoko Kobayashi(Tamagawa University), Youhei Kinoshita(一般財団法人リモート・センシング技術センター, 共同), Takahiro Abe(Earth Observation Research Center, Japan Aerospace Exploration Agency)

[STT48-P03] A Catalog of ALOS-2 SAR Interferograms Associated with Global Large Earthquakes in 2014-2016

*Yu Morishita1 (1.Geospatial Information Authority of Japan)

Keywords:ALOS-2, InSAR, Crustal deformation, Surface rupture

I produced SAR interferograms using ALOS-2 data to detect coseismic deformations associated with large (magnitude >= 6) and shallow onshore earthquakes from August 2014 to December 2016 all over the world. Substantially coherent interferograms were produced for all 30 targeted seismic events, even in tropical areas, where C-band Sentinel-1 interferometry is unpromising due to a severe decorrelation problem. High coherence of the ALOS-2 InSAR also greatly helps to identification of surface ruptures. In this study, surface ruptures were successfully identified at least in seven events. Moreover, left-looking observations of ALOS-2 enable to retrieve three dimensional deformation with high precision, including the north-south component, although the left-looking observations are basically conducted only in Japan area. In the case of the 2016 central Tottori earthquake, Japan, clear four-quadrant three dimensional deformation pattern was retrieved, implying that almost pure sinistral slip occurred.