Application Of Sentinel-1 Data In Co-seismic Deformation And Post-seismic Deformation Research

This paper presents a detailed introduction to the research status and theory of application of In SAR technology.Then,for the earthquake occurred in Aketau,Xinjiang on November 25,2016,the coseismic deformation and post-seismic deformation of the earthquake were studied using D-In SAR technology and SBAS-In SAR technology,respectively.The D-In SAR technology was used to study the earthquake.Co-seismic deformation of the Iraq earthquake that occurred on November 12,2017.The main conclusions of this study are as follows:(1)The D-InSAR technique was used to study the coseismic deformation characteristics of the Aketau 6.6 earthquake in Xinjiang: The coseismic deformation field of the decending and ascending was significantly different.The ascending data showed that the southwest plate of the fault was mainly manifested as the upswing of the LOS.The decending data show that the southwest plate of the fault is mainly subsidence settling in the LOS,which is caused by the observation model;the LOS deformation from the three kinds of observation modes shows that the seismogenic fault strikes the near east-west direction,and the the coseismic deformation zone is approximately 50 km along the east-west direction.While the LOS is decomposed into the vertical direction and along the direction of the fault strike.This earthquake shows it is a dextral strike-slip feature,which is consistent with the results of the three-dimensional solution using the direct decomposition method.Using the three modes of LOS to constrain the deformation,the coseismic deformation field residuals of the decending Sentinel-1B.ascending Sentinel-1A and ascending ALOS-2 mode obtained by inversion are effectively controlled,basically within ±5 cm.The RMS residuals were 1.8 cm,1.2 cm,and 2.0 cm,respectively.The slip distribution of the faults was mainly concentrated in the depth of 2 to 16 km.There are mainly two sliding distribution centers.The average rake angle and the maximum sliding angle are close to 180°.,The Aktau earthquake was a dextral strike-slip rupture event,which was consistent with the solution results;the inversion obtained the epicenter was(74.39°E,39.17°N),and the inversion obtained the magnitude of the earthquake moment Mw 6.60,which was consistent with the result of other research institutions.(2)The coseismic deformation characteristics of Iraq's Mw 7.8 earthquake are studied by D-In SAR technology.It is known from the coseismic deformation field of different observation mode data that this seismic feature is an inverted feature;Using the two modes of LOS to constrain the deformation,The coseismic deformation field residuals of the decending Sentinel-1B and ascending Sentinel-1A mode are effectively controlled,basically within ±5 cm,and the RMS residuals are 2.3 cm and 2.2 cm,respectively;According to the slip distribution of the faults,the seismic event was characterized by the rupture of the reversed nature and was accompanied by a dextral strike-slip feature.The fault slip distribution was mainly concentrated in the fault plane at 15~35 km,and the average slip was about 0.75 m.The average sliding angle is about 142.21°.The maximum sliding amount obtained is 4.25 m.It is located at 25.25 km.The sliding angle at the maximum sliding point is about 131.36°.If the maximum sliding point is considered as the epicenter,the epicenter of the inversion is obtained.It is(45.88°E,34.68°N);the magnitude of the earthquake moment Mw 7.32 which is consistent with the results of other research institutes.(3)Using the SBAS-In SAR method to study the post-earthquake deformation characteristics of the Aktau Mw 6.6 earthquake in Xinjiang: Using the GMTSAR software to process it,the LOS annual average displacement rate map for the region was obtained.The results showed that the average annual maximum sedimentation rate of LOS in the region was-21 mm/yr,and the maximum LOS uplift rate to the annual average was 38 mm/yr.In the deformation areas on both sides near the fault,the average annual deformation rate of the northeastern plate is about-10~20 mm/yr,the standard deviation RMS is 8~15 mm/yr,and the average annual change rate of the southwest plate is-8-10 mm/yr.The standard deviation RMS is 6-18 mm/yr.Different deformation features can be seen on both sides of the fault.The northeast plate of the fault mainly shows uplift deformation,and the southwest plate of the fault shows subsidence deformation.Overall,the post deformation characteristics and coseismic deformation characteristics of the earthquake are consistence which shows some trend and relationship in post-deformation and coseismic deformation.