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We applied the double-difference earthquake relocation algorithm to 1348 earthquakes with M_S≥2.0 that occurred in the northern Tianshan region, Xinjiang, from April 1988 to June 2003, using a total of 28701 P- and S-wave arrival times recorded by 32 seismic stations in Xinjiang. Aiming to obtain most of these M_S≥2.0 earthquakes relocations, and considering the requirements of the DD method and the condition of data, we added the travel time data of another 437 earthquakes with 1.5≤M_S<2.0. Finally, we obtained the relocation results for 1253 earthquakes with M_S≥2.0, which account for 93% of all the 1348 earthquakes with M_S≥2.0 and includes all the M_S≥3.0 earthquakes. The reason for not relocating the 95 earthquakes with 2.0≤M_S<3.0 is analyzed in the paper. After relocation, the RMS residual decreased from 0.83s to 0.14s, the average error is 0.993 km in E-W direction, 1.10 km in N-S direction, and 1.33 km in vertical direction. The hypocenter depths are more convergent than before and distributed from 5 km to 35 km, with 94% being from 5km to 35 km, 68.2% from 10 km to 25 km. The average hypocenter depth is 19 km.
We applied the double-difference earthquake relocation algorithm to 1348 earthquakes with M_S≥2.0 that occurred in the northern Tianshan region, Xinjiang, from April 1988 to June 2003, using a total of 28701 P- and S-wave arrival times recorded by 32 seismic stations in Xinjiang. Aiming to obtain most of these M_S ≧ 2.0 earthquakes relocations, and considering the requirements of the DD method and the condition of data, we added the travel time data of another 437 earthquakes with 1.5 ≦ M_S <2.0. Finally, we The relocation results for 1253 earthquakes with M_S ≧ 2.0, which account for 93% of all the 1348 earthquakes with M_S ≧ 2.0 and includes all the M_S ≧ 3.0 earthquakes. The reason for not relocating the 95 earthquakes with 2.0 ≦ M_S <3.0 is After relocation, the RMS residual decreased from 0.83s to 0.14s, the average error is 0.993 km in EW direction, 1.10 km in NS direction, and 1.33 km in vertical direction. The hypocenter depths are more converg The average hypocenter depth is 19 km. The average hypocenter depth is 23 km, with 94% being from 5km to 35 km, 68.2% from 10 km to 25 km.