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????InSAR??????ENVISAT ASAR?????????????2008??3??21??????7.1??????????α?????????????????????????????????????????????????????????????????????????????????????????????????????????????λ??????0~14 km???????????λ???ж?F2??2.05 km?????5.47 m??????F1????????????????????????????ж?F2?????F3-N/F3??S??????????????????????????????????????????????ж?????Σ????λ???????С?????????????Mo=5.16??10 ¹⁹ N??m?????????7.07????

COSEISMIC SLIP DISTRIBUTION OF YUTIAN Mw7.1 EARTHQUAKE BASED ON STEEPEST DESCEND METHOD

Using InSAR technology and the ENVISAT ASAR data, this paper obtains the coseismic deformation fields of Yutian %M%w{7.1} earthquake happened on March 21, 2008.This paper inverts the coseismic slip distribution of Yutian earthquake with the Steepest Descent Method (SDM). The results are shown as follows.The inversion residual errors of the ascending and descending orbit surface deformation field are effectively controlled to small value; the major slip distribution is concentratedly located from 0 to 14 km depth along the fault plane; The largest slip value is about 5.47 m which is located in depth of 2.05 km along the fault plane of F2; the northern section of F1 is the oblique slip rupture nearly equal to left lateral strike slip and dip slip, while the middle section of F2 and southern section of F3 N/F3 S are basically the dip slip rupture with a little of left lateral strike slip; The slip is mainly concentrated in the middle and southern section, and the slip of the northern section is small, the total seismic moment M0 from inversion is about 5.16×10 ¹⁹ Nm, equivalent to moment magnitude Mw7.07.