ALOS-2 and Sentinel-1A
observation of the M7.8 Kaikoura earthquake in New Zealand
Xiaopeng Tong, Xiaohua Xu, David T.
Sandwell, Dan Bassett
This earthquake occurred on Nov 14, 2016 (NZDT) in the South
Island, New Zealand, near the plate boundary between the Australia
plate and the Pacific plate. It was a M7.8 earthquake that
broke multiple faults, near the northeast coast of the South
Island and the tourist town Kaikoura. The earthquake involves
fault slip on the Marlborough fault system. The investigation of
this earthquake and faults is still on-going. On Dec 7, it is reported
from GNS Science that nine faults were involved. Here
we present InSAR observations of this earthquake from ALOS-2
(JAXA) and Sentinel-1A (ESA) satellite, including line-of-sight
displacement and pixel offsets. The data is processed with
GMT5SAR. The line-of-sight displacement data is available for
downloading. It has the format as follows: longitude, latitude,
elevation, east-look, north-look, vertical-look, los displacement
(mm), uncertainties. A google earth kmz file is available for viewing.
(Left) Line-of-sight
displacement from Sentinel-1A ascending TOPS inteferogram
(11/03/2016-11/15/2016) (Right) Line-of-sight displacement from
ALOS2 ScanSAR descending interferogram (10/18/2016 --
11/15/2016). Red means toward line-of-sight
direction.
(left) Line-of-sight displacement from ALOS2 ascending interferogram (10/6/2016 -- 11/17/2016). (middle) pixel offsets in range; blue color means away from line-of-sight direction. (right) pixel offsets in azimuth; blue means southeastward motion.
(left) pixel offsets in range from ALOS-2 ScanSAR descending interferogram (10/18/2016 -- 11/15/2016); red means toward line-of-sight direction. (right) pixel offsets in azimuth, red means southwestward motion.
Line-of-sight displacement from ALOS2 ScanSAR ascending interferogram (8/11/2016 -- 12/01/2016). Red means toward line-of-sight direction.