那曲、和田台阵对汶川地震序列的定位误差校正

Corrections for the location errors of Wenchuan aftershocks recorded by Nagqu and Hotan array

摘要:

针对汶川地震序列，利用慢度-方位角台站校正( SASC)法来提高那曲、和田2 个台阵的定位精度。结果显示，那曲台阵对汶川地震序列定位后，其后方位角和慢度残差的标准偏差在校正后分别降低了32% 和58% ;和田台阵的分别降低了38% 和71% 。校正后，那曲台阵记录的汶川地震序列中100% 的地震都提高了定位精度;和田台阵记录的所有地震的后方位角精度均得到提高，78% 的地震其慢度精度得到了提高。

Abstract:

We use slowness-azimuth station correction ( SASC) method to improve the location accuracy of the Wenchuan aftershocks recorded by Nagqu and Hotan seismic arrays． The results showed that the standard deviations of backazimuth and slowness errors of Wenchuan aftershocks recorded by Nagqu array decreased 32% and 58% respectively after correction． The numbers are 38% and 71% for Hotan array． After the correction，the location accuracy of Wenchuan aftershocks recorded by Nagqu array are all improved，for Hotan array，78% aftershocks were improved in slowness and 100% were improved in backazimuth．