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摘要
An M(s)6. 3 earthquake (M1) struck Kangding county in Sichuan province on 22 November 2014. Three days later, another M(s)5. 8 earthquake (M2) occurred in almost the same area. Both together are called "Kangding earthquake-doublet" here. Firstly, we used the time-reversal imaging technique to relocate the doublet and an M(L)4. 8 earthquake (G1) which was used as the empirical Green's function event, and then we used the generalized polarity and amplitude technique to invert for their focal mechanisms. Secondly, we retrieved the Apparent Source Time Functions (ASTFs) of the M1 and M2 with the G1 using the empirical Green's function technique, and analyzed their dominant rupture directions with the azimuth-dependent ASTFs. Lastly, we obtained the spatial-temporal rupture processes of the Ml and M2 by inverting the ASTFs. The relocation results show that the G1 is fairly but not very close to the M1 and M2, similar to 40 km and similar to 50 km apart, respectively. The inverted focal mechanism results show that the G1 is similar to the Ml and M2, respectively, in focal mechanism, being steep-dip left-lateral strike-slip events. The analysis of the ASTFs' azimuth-dependence suggests that the dominant rupture direction of the M1 is 276 degrees while that of the M2 is 336 degrees. The inverted rupture processes indicate that the M1 lasted similar to 11 s, and its main rupture propagated toward NW and to ground surface, resulting in a maximal slip of similar to 0. 52 m; the M2 lasted similar to 7 s, and its rupture propagated toward NW and toward ground surface, resulting in a maximal slip of similar to 0. 33 m.
- 出版日期2016-7
- 单位中国地震局
