Volcanic deformation of Atosanupuri volcanic complex in the Kussharo caldera, Japan, from 1993 to 2016 revealed by JERS-1, ALOS, and ALOS-2 radar interferometry

Earth, Planets and Space

Table 1 List of interferograms analyzed

InSAR pair	Acquisition date master image	Acquisition date slave image	Time span (day)	Bp (m)	Time series	Maximum displacement (cm)	Corrected maximum displacement (cm)
1	May 18, 1993	May 9, 1997	1452	159	C	13	13
2	August 13, 1993	April 21, 1995	616	−663	A	19	20
3	August 13, 1993	July 22, 1998	1804	45	A	10*	8*
4	September 13, 1994	August 31, 1995	352	−527	B	6	6
5	September 13, 1994	April 25, 1998	1320	−193	B	−2	−2
6	April 21, 1995	April 7, 1996	352	736	A	−3	−3
7	April 21, 1995	July 22, 1998	1188	712	A	−9	−9
8	July 19, 1995	June 9, 1998	1056	478	D	−11	−11
9	July 19, 1995	July 23, 1998	1100	−186	D	−7	−7
10	August 31, 1995	October 31, 1997	792	−556	B	−4	−4
11	August 31, 1995	April 25, 1998	968	333	B	−7	−7
12	April 7, 1996	March 25, 1997	352	985	A	−6	−5
13	March 25, 1997	June 8, 1998	440	227	A	−3	−3
14	June 9, 1998	July 23, 1998	44	−659	D	3	3
A1	September 22, 2007	August 15, 2010	1058	819	E	−6	−5
A2	May 9, 2008	November 15, 2010	920	310	F	−4	−4
A3	August 9, 2014	August 6, 2016	728	−47	G	−1	0
A4	August 25, 2014	June 13, 2016	658	22	H	−2	−1
A5	September 29, 2014	July 4, 2016	644	8	I	−1	0

JERS-1 data are used in InSAR pairs 1–14, ALOS data are used in A1 and A2, and ALOS-2 data are used in A3, A4, and A5. InSAR data were acquired from descending orbit except for InSAR pair A4. The off-nadir angle of JERS-1 is 35°, and that of A1, A2, A3, A4, and A5 is 34.3°, 34.3°, 29.1°, 32.4°, and 38.2°, respectively. Bp means a perpendicular baseline. There are nine time series; A–I. Temporal evolution of displacement can be obtained only from InSAR pairs belonging to the same time series. Maximum displacement shows the maximum displacement in LOS direction in each SAR interferogram. Corrected maximum displacement is obtained by subtracting constant small-scale displacement from the maximum displacement. *Because InSAR pair 3 was highly decorrelated and noisy, the maximum displacement value was not reliable