排序方式： 共有3条查询结果，搜索用时 19 毫秒
1
1.
We use the slowness-azimuth station correction （SASC） method to improve the location accuracy of the Wenchuan aftershocks recorded by the Nagqu and Hotan seismic arrays. The results show that the standard deviations of back-azimuth and slowness errors of Wenchuan aftershocks recorded by the Nagqu array decreased by 32% and 58% respectively after correction. The decrease is 38 % and 71% for the Hotan array. After the correction, the location accuracy of all Wenchuan aftershocks recorded by the Nagqu array is improved. For the Hotan array, the accuracy is improved in the slowness estimation for 78 % of aftershocks and in back-azimuth estimation for all aftershocks. 相似文献
2.
The seismic arrays at Hailar (HILR) and at Lanzhou (LZDM) in China are both primary stations of the International Monitoring
System for verifying compliance with the Comprehensive Nuclear Test Ban Treaty. These two stations became operational in 2002
and have since then provided continuous data. In this study, the so-called slowness–azimuth station corrections (SASC) were
derived and used to improve the location accuracy of the two arrays. The SASC are found by comparing the back-azimuth and
slownesses obtained from array processing to the theoretical values calculated from the reported event locations and the corresponding
seismic velocity model. Events reported by the National Earthquake International Center in the time period 2002 to 2006 were
used as reference events, and the IASP91 was used as the theoretical velocity model. Small correction vectors with random
orientation were found for HILR. Larger correction vectors with systematic vector biases were found for LZDM. The LZDM correction
vectors seem to point to the same direction in a large part of the slowness space and may be attributed to local structure.
After introducing the SASC for HILR, the standard deviations of back-azimuth and slowness residuals drop from 7.1° to 4.6°
and from 1.0 to 0.6 s/°, respectively. For LZDM, these values drop from 22.3° to 10.2° and from 2.9 to 1.1 s/°, respectively.
The variations of back-azimuth and slowness residuals were reduced by 32% and 30.2%, respectively, for HILR after SASC and
the reductions were 21% and 40.2% for LZDM. The improvements were 77% in back-azimuth and 67% in slowness location for HILR
and were 79% and 81% for LZDM after SASC.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
3.
1