Dangxiong Fault Activity Monitoring by PS InSAR Technique
Jingfa Zhang(1) and Lixia Gong(1)
(1) Institute of Crustal Dynamics, CEA, Box 2855, Beijing, P.R.China, 100085, China
Dangxiong Fault, which strikes NE, is pregnant with strong earthquake. It is also a Left-lateral strike-slip transfer fault zone to link Yajiang Shenzha and Banhu-Nujiang faults. In its south part, where Dangxiong fault and Yajiang fault converge, an earthquake about Ms.8.0 occurred in 1411. And earthquakes of Ms 8.0 (1981) and Ms 7.5 (1952) occurred in the northern area near Banhu-Nujiang fault. The middle segment of Dangxiong fault is fruit of geothermic energy in Yangbajing. So Dangxiong fault plays an important role in the studying of Indian and Asian continental collision because of its typical transfer characteristic. The fault is an active zone of fracture itself, it can respond evidently to the nearby areas’ strong earthquake.
Some artificial corner reflectors were set up near the fault, and some natural PSs had been identified, which can be used to form a network for monitoring the fault movement. Meanwhile, many pairs SAR data of this region had being obtained, including ERS and ENVISAT.
The intensity information of numerous accumulated SAR images or the phase characteristics of pixels can be used to identify and detect the natural and artificial PSs. By using the tandem ERS pairs and MERIS data to analyze and remove the atmospheric and other noise, PS InSAR technique can obtain the fault activity to study its response to global strong earthquakes and nearby mid-strong earthquakes.
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,