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The Research Room of Earth Observation from Space and Crustal Deformation Obtained Coseismic Interference Patterns of Japanese Kumamoto Earthquake Based on InSAR Technology by Using Sentinel-1A Satellite Image

2016/12/30 9:00:37

At 16: 25 April 15, 2016 UTC Time, an Mw7.0 earthquake struck Kumamoto County, Kyushu, Japan. The fault was in NE-WE direction, and the seismogenic depth was 11km. On the day before this day, this area experienced two earthquakes at Mw6.2 and Mw6.0 respectively. These three earthquakes were all caused by convergence of Philippines Sea Plate and Eurasian Plate.

Based on Interferometric Synthetic Aperture Radar (InSAR) technology, the Research Room of Earth Observation from Space and Crustal Deformation, Institute of Geology, CEA (Gong Wenyu, Shan Xinjian and Jiang Yu) used Sentinel-1A images to obtain LOS deformation sum of multiple earthquakes hitting this area from April 8 to April 20 (as shown in the diagram below). Each streak stands for deformation phase of 6π (about 0.083m).  The interference result indicates the maximum positive deformation is 1.05m, the minimum negative deformation is 0.63m, and the influencing range is about 60km×60km.

[Note: Satellite image data is from ESA Copernicus Sentinel-1A, and was obtained via

https://www.asf.alaska.edu/sentinel/; fault data is from

https://gbank.gsj.jp/activefault/index_gmap.html; the data of historical earthquakes is from

http://www.fnet.bosai.go.jp/event/search.php?LANG=en]