塔里木盆地, 拾震器方位角, P波主成分分析法, P波切向最小能量法, Rayleigh波相关系数法, 磁偏角, SKS波分裂

Based on the rigorous constraints on the data from the 66 broad band transportable stations of the Tarim seismic array for the lithospheric signature of mantle plume (TASTE), the calibrations of the sensor misorientation angles were achieved by three internationally commonly used methods — P-wave principal component analysis method, transverse P-wave energy minimization method and Rayleigh-wave correlation coefficient method. The results obtained from these three methods demonstrated remarkable consistency with correlations ranging from 0.64 to 0.91. Following the integration analysis, the final sensor misorientation angles were established. Among the stations, 62 stations exhibited relatively stable sensor orientations. None of the stations showed evidence of north-south reversals, nor did their sensor misorientation angles display systematically time-dependent variations. When compared with magnetic declination, it was observed that the sensor misorientation angles of 40 stations fell within ±3° of the magnetic declination. This suggests that the TASTE network experiences a low level of external interference, thereby ensuring the high quality of the station deployment. Two examples of SKS wave splitting were used to evaluate the influence of sensor misorientation angles on shear wave splitting measurements. The necessity of calibrating sensor misorientation angles in seismology was demonstrated.

Tarim Basin, sensor misorientation angle, P-wave principal component analysis method, transverse P-Wave energy minimization method, Rayleigh-wave correlation coefficient method, magnetic declination, SKS wave splitting